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1. Event-by-event charged–neutral fluctuations in Pb+Pb collisions at 158 A GeV

Author

W. Pinanaud, I. Roufanov, S. Vörös, Mikhail Ippolitov, Sudhir Raniwala, J. M. Rubio, B.N. Gus'kov, A. Kugler, D. P. Mahapatra, Krzysztof Karpio, D. Y.-U. Peressounko, S. Nikolaev, Jan Rak, Klaus Johannes Reygers, G.S. Shabratova, A.L.S. Angelis, D. Bucher, I. Hrivnacova, T.K. Ghosh, K. Söderström, G. Martínez, A. A. Tsvetkov, C. Blume, V. Petracek, Teodor Siemiarczuk, Bolek Wyslouch, P. Donni, Vladislav Manko, K. Enosawa, O. P. Gavrishchuk, S. P. Sorensen, M. R. Dutta Majumdar, H. Delagrange, V. Astakhov, Peter M. Nilsson, M. L. Purschke, V. Arefiev, T. C. Awes, S. Bathe, A.S. Vodopianov, G. Sood, Zubayer Ahammed, Michal Sumbera, R. Santo, S. K. Badyal, S. Pavliouk, D. S. Mukhopadhyay, L. Tykarski, T. K. Nayak, Bikash Sinha, H. Kalechofsky, Bedangadas Mohanty, R. Glasow, F. J M Geurts, A.L. Lebedev, K. Karadjev, T. H. Shah, H. Naef, A. Nianine, Sergey Fokin, V.G. Antonenko, V. S. Bhatia, Susumu Sato, D. P. Morrison, G. R. Young, Hans Rudolf Schmidt, Y. P. Viyogi, I. Sibiriak, R. Kamermans, L. Luquin, G. Stefanek, S. Garpman, T. Bernier, H. A. Gustafsson, S. K. Nayak, Sanjeev Singh Sambyal, H. Schlagheck, Ramni Gupta, I. Kosarev, I. Koutcheryaev, P.V.K.S. Baba, Sukalyan Chattopadhyay, S. Nishimura, Vladimir Frolov, M. S. Ganti, K. B. Bhalla, M. J. Mora, Lars Carlén, Petr Nomokonov, Rashmi Raniwala, Hengchang Liu, I. Otterlund, N. K. Rao, F. Plasil, H. Büsching, B. K. Nandi, E. Stenlund, A. Oskarsson, P. Kulinich, Nikolai V Slavine, David Olle Rickard Silvermyr, T. Peitzmann, A. A. Vinogradov, F. Retiere, B. Batiounia, C. Roy, T. V. Moukhanova, Y. Schutz, L. Rosselet, V. Nikitine, T. Svensson, H. H. Gutbrod, Gunther Roland, P. Steinberg, J. Nystrand, Anand Kumar Dubey, P. W. Stankus, G.J.v. Nieuwenhuizen, Herbert Löhner, Yasuo Miake, M. P. Decowski, MV Manzano Martin, A. Maximov, Madan M. Aggarwal, B. W. Kolb, K. El Chenawi, N. v. Eijndhoven, V. Avdeitchikov, E. C. v. d. Pijll, M. Kurata, and G. C. Mishra

Subjects
Physics, Nuclear and High Energy Physics, biology, Meson, Hadron, Elementary particle, Venus, biology.organism_classification, Charged particle, Nuclear physics, Massless particle, Pion, Nuclear Experiment, Event (particle physics)
Abstract

Charged particles and photons have been measured in central Pb + Pb collisions at 158 A GeV in a common (eta-phi)-phase space region in the WA98 experiment at the CERN SPS. The measured distributions have been analyzed to quantify the frequency with which phase space regions of varying sizes have either small or large neutral pion fraction. The measured results are compared with VENUS model simulated events and with mixed events. Events with both large and small charged-neutral fluctuations are observed to occur more frequently than expected statistically, as deduced from mixed events, or as predicted by model simulations, with the difference becoming more prominent with decreasing size of the A Delta eta-Delta phi region. (C) 2011 Elsevier B.V. All rights reserved.

Published
2011

2. Azimuthal anisotropy of photon and charged particle emissionin 208Pb + 208Pb collisions at 158 $\cdot A$ GeV/c

Author

H. Kalechofsky, C. Blume, A.L.S. Angelis, O. P. Gavrishchuk, V. S. Bhatia, [No Value] Frolov, Zubayer Ahammed, P. Kulinich, R. Kamermans, S. K. Badyal, H. Delagrange, [No Value] Antonenko, Madan M. Aggarwal, K. Karadjev, A. K. Dubey, B.N. Gus'kov, Herbert Löhner, Sergey Fokin, A. Kugler, B. W. Kolb, Ganti, [No Value] Kosarev, K. El Chenawi, S. Garpman, [No Value] Hrivnacova, H. A. Gustafsson, M. P. Decowski, T. C. Awes, [No Value] Arefiev, B. Batiounia, H. H. Gutbrod, Richa Gupta, Mrd Majumdar, [No Value] Astakhov, S. Bathe, D. Bucher, P.V.K.S. Baba, Sukalyan Chattopadhyay, R. Glasow, [No Value] Koutcheryaev, Wa Collaborat, H. Büsching, T. K. Ghosh, K. Enosawa, Lars Carlén, [No Value] Avdeitchikov, T. Bernier, Mikhail Ippolitov, P. Donni, F. J M Geurts, and Krzysztof Karpio

Subjects
Physics, Large Hadron Collider, Photon, Physics and Astronomy (miscellaneous), 010308 nuclear & particles physics, Elliptic flow, 01 natural sciences, Charged particle, Nuclear physics, symbols.namesake, Fourier analysis, 0103 physical sciences, symbols, Nuclear Experiment, 010306 general physics, Anisotropy, Engineering (miscellaneous), Fourier series, Event (particle physics)
Abstract

The azimuthal distributions of photons and charged particles with respect to the event plane are investigated as a function of centrality in Pb-208 + Pb-208 collisions at 158 (.) A GeV/c in the WA98 experiment at the CERN SPS. The anisotropy of the azimuthal distributions is characterized using a Fourier analysis. For both the photon and charged particle distributions the first two Fourier coefficients are observed to decrease with increasing centrality. The observed anisotropies of the photon distributions compare well with the expectations from the charged particle measurements for all centralities.

Published
2005

3. Photon flow in 158 A GeV Pb+Pb collisions

Author

Sergey Nikolaev, M.M. Aggarwal, A.L.S. Angelis, V. Antonenko, V. Arefiev, V. Astakhov, V. Avdeitchikov, T.C. Awes, P.V.K.S. Baba, S.K. Badyal, S. Bathe, B. Batiounia, T. Bernier, K.B. Bhalla, V.S. Bhatia, C. Blume, D. Bucher, H. Büsching, L. Carlen, S. Chattopadhyay, M.P. Decowski, H. Delagrange, P. Donni, M.R. Dutta Majumdar, A.K. Dubey, K. El Chenawi, K. Enosawa, S. Fokin, V. Frolov, M.S. Ganti, S. Garpman, O. Gavrishchuk, F.J.M. Geurts, T.K. Ghosh, R. Glasow, B. Guskov, H.Å. Gustafsson, H.H. Gutbrod, I. Hrivnacova, M. Ippolitov, H. Kalechofsky, K. Karadjev, K. Karpio, B.W. Kolb, I. Kosarev, I. Koutcheryaev, A. Kugler, P. Kulinich, M. Kurata, A. Lebedev, H. Löhner, L. Luquin, D.P. Mahapatra, V. Manko, M. Martin, G. Martínez, A. Maximov, Y. Miake, G.C. Mishra, B. Mohanty, M.-J. Mora, D. Morrison, T. Mukhanova, D.S. Mukhopadhyay, H. Naef, B.K. Nandi, S.K. Nayak, T.K. Nayak, A. Nianine, V. Nikitine, S. Nikolaev, P. Nilsson, S. Nishimura, P. Nomokonov, J. Nystrand, A. Oskarsson, I. Otterlund, T. Peitzmann, D. Peressounko, V. Petracek, S.C. Phatak, W. Pinganaud, F. Plasil, M.L. Purschke, J. Rak, R. Raniwala, S. Raniwala, N.K. Rao, F. Retiere, K. Reygers, G. Roland, L. Rosselet, I. Roufanov, C. Roy, J.M. Rubio, S.S. Sambyal, R. Santo, S. Sato, H. Schlagheck, H.-R. Schmidt, Y. Schutz, G. Shabratova, T.H. Shah, I. Sibiriak, T. Siemiarczuk, D. Silvermyr, B.C. Sinha, N. Slavine, K. Söderström, S.P. Sørensen, P. Stankus, G. Stefanek, P. Steinberg, E. Stenlund, M. Sumbera, T. Svensson, A. Tsvetkov, L. Tykarski, E.C.v.d. Pijll, N.v. Eijndhoven, G.J.v. Nieuwenhuizen, A. Vinogradov, Y.P. Viyogi, A. Vodopianov, S. Vörös, B. Wysłouch, and G.R. Young

Subjects
Physics, Nuclear reaction, Nuclear and High Energy Physics, Particle physics, Photon, Meson, Nuclear Theory, Hadron, Elliptic flow, Elementary particle, Nuclear physics, Pion, High Energy Physics::Experiment, Rapidity, Nuclear Experiment
Abstract

Directed and elliptic flow of pi(0) - decay photons in 158 A GeV Pb+Pb collisions has been studied near midrapidity in an analysis of data obtained with the photon spectrometer LEDA of the WA98 experiment at the CERN SPS. Preliminary results on the rapidity and transverse momentum dependence of the flow have been obtained for various centrality classes for p(T) > 0.2 GeV/c and 2.3 < y < 2.9. The results are compared with the pion flow.

Published
2003

4. Observation of Direct Photons in Central158AGeVP208b+P208bCollisions

Author

H. Delagrange, Shunji Nishimura, K. Yagi, H. Kalechofsky, MV Manzano Martin, S. K. Nayak, Md. F. Mir, Madan M. Aggarwal, S. Dutt, S. Pavliouk, M. L. Purschke, H. Naef, A. Nianine, Y. Yokota, Yasuo Miake, C. Blume, S. Neumaier, L. Luquin, V. Djordjadze, G. Sood, R. Cherbatchev, Sanjeev Singh Sambyal, V. S. Bhatia, M. Kurata, A. Kugler, Z.K. Böröcz, R. Santo, E.-M. Bohne, B. W. Kolb, Gerrit Jan van Nieuwenhuizen, I. Hrivnacova, O. P. Gavrishchuk, G. Stefanek, S. Garpman, A.S. Vodopianov, D. P. Mahapatra, Agneta Oskarsson, R. Kamermans, P. Steinberg, S. P. Sorensen, I. Otterlund, K. El Chenawi, T. K. Nayak, M. D. Trivedi, Y.Y. Lee, V. Nikitine, Peter M. Nilsson, P. Foka, G.S. Shabratova, K. Söderström, T. Svensson, S. Knoche, E. Stenlund, A.L.S. Angelis, Klaus Johannes Reygers, F. Retiere, D. P. Morrison, B.N. Gus'kov, W. Pinganaud, A. Agnihotri, P. W. Stankus, G. R. Young, Herbert Löhner, G. C. Mishra, Zubayer Ahammed, Joakim Nystrand, Krzysztof Karpio, N. Solomey, Gunther Roland, M. R. Dutta Majumdar, M. Pachr, V. Astakhov, D. Bucher, N. v. Eijndhoven, Hiroyuki Sako, Tatsuya Chujo, S. K. Badyal, Jan Rak, J. Urbahn, Y. Schutz, K. Karadjev, E. C. v. d. Pijll, Sergey Fokin, N.A. Kuzmin, Y. P. Viyogi, Bikash Sinha, A. Maximov, D. Stüken, I. Langbein, I. Sibiriak, R. Higuchi, Sergey Nikolaev, S. Eliseev, S. Kees, V. Avdeitchikov, M. P. Decowski, P. Donni, U. v. Poblotzki, V. Arefiev, T. C. Awes, Teodor Siemiarczuk, Sukalyan Chattopadhyay, G. Martínez, T. Krümpel, M. S. Ganti, V. Petracek, Kh Kampert, L. Rosselet, I. Doubovik, A. C. Das, Vladislav Manko, R. Bock, F. Plasil, H. Büsching, A. A. Tsvetkov, Bolek Wyslouch, A. Buijs, Bedangadas Mohanty, T. Peitzmann, R. Glasow, B. K. Nandi, A.L. Lebedev, P. Kulinich, Nikolai V Slavine, Y. Miyamoto, Mikhail Ippolitov, G. Mgebrichvili, S. Bathe, Shiv K. Gupta, Michal Sumbera, K. Enosawa, I. Koutcheryaev, V. S. Ramamurthy, S. Kato, F. E. Obenshain, D. S. Mukhopadhyay, P.V.K.S. Baba, L. Tykarski, I. Roufanov, H. Å. Gustafsson, F. J M Geurts, T. K. Ghosh, V.G. Antonenko, S. Vörös, H. H. Gutbrod, Hans Rudolf Schmidt, Petr Nomokonov, Rashmi Raniwala, A. A. Vinogradov, Susumu Sato, B. Batiounia, T. Bernier, N. K. Rao, K. B. Bhalla, M. J. Mora, H. Schlagheck, I. Kosarev, Sudhir Raniwala, J. M. Rubio, Lars Carlén, David Olle Rickard Silvermyr, C. Roy, K. Kurita, C. Barlag, V. Chalyshev, C. Klein-Bösing, T. H. Shah, and A. Claussen

Subjects
Physics, Particle physics, Large Hadron Collider, Photon, Nuclear Theory, Hadron, General Physics and Astronomy, Elementary particle, Spectral line, Massless particle, Nuclear physics, Quark–gluon plasma, High Energy Physics::Experiment, Nuclear Experiment, Boson
Abstract

A measurement of direct photon production in {sup 208}Pb+ {sup 208}Pb collisions at 158A GeV has been carried out in the CERN WA98 experiment. The invariant yield of direct photons in central collisions is extracted as a function of transverse momentum in the interval 0.5 1.5 GeV/c . The result constitutes the first observation of direct photons in ultrarelativistic heavy-ion collisions. It could be significant for diagnosis of quark-gluon-plasma formation.

Published
2000

5. Three-Pion Interferometry Results from CentralPb+PbCollisions at158AGeV/c

Author

M. Kurata, H. Kalechofsky, [No Value] Antonenko, Krzysztof Karpio, H. Naef, A. Nianine, MV Manzano Martin, Jan Rak, V. S. Bhatia, H. Delagrange, Trivedi, L. Rosselet, Md. F. Mir, T. H. Shah, K. Yagi, A. A. Vinogradov, M. Pachr, Kh Kampert, R. Bock, A. Claussen, B. Batiounia, G. Stefanek, C. Blume, E.-M. Bohne, [No Value] Doubovik, David Olle Rickard Silvermyr, T. C. Awes, O. P. Gavrishchuk, P. Kulinich, Nikolai V Slavine, D. S. Mukhopadhyay, Gunther Roland, P. Foka, K. Kurita, Shunji Nishimura, Ganti, V. S. Ramamurthy, Z.K. Böröcz, N. van Eijndhoven, L. Luquin, [No Value] Arefiev, G. R. Young, R. Santo, G. C. Mishra, R. Kamermans, A.L.S. Angelis, C. Roy, C. Barlag, T. Krümpel, G.S. Shabratova, T. K. Nayak, Subhasis Chattopadhyay, Agneta Oskarsson, M. P. Decowski, [No Value] Nikitine, K. Söderström, S. Pavliouk, M. L. Purschke, Teodor Siemiarczuk, S. Garpman, D. P. Mahapatra, P. W. Stankus, A. Maximov, H. A. Gustafsson, [No Value] Manko, D. Stüken, K. B. Bhalla, M. J. Mora, S. K. Nayak, S. Neumaier, Herbert Löhner, EC van der Pijll, Sergey Nikolaev, Yasuo Miake, Joakim Nystrand, S. Eliseev, S. P. Sorensen, Y. P. Viyogi, Peter M. Nilsson, P. Steinberg, Klaus Johannes Reygers, D. Bucher, K. Karadjev, S. Knoche, Sergey Fokin, F. Retiere, K. Enosawa, S. Kato, T. K. Ghosh, [No Value] Astakhov, Zubayer Ahammed, A. Agnihotri, Mikhail Ippolitov, A. Kugler, N. Solomey, S. Dutt, C. Klein-Bösing, Bedangadas Mohanty, R. Glasow, A.L. Lebedev, [No Value] Petracek, S. Vörös, [No Value] Koutcheryaev, [No Value] Djordjadze, Michal Sumbera, H. Schlagheck, L. Tykarski, A. C. Das, N. Kuzmin, Lars Carlén, S Bathe, Sudhir Raniwala, J. M. Rubio, F. J M Geurts, H. H. Gutbrod, Petr Nomokonov, [No Value] Avdeitchikov, Rashmi Raniwala, T. Bernier, N. K. Rao, F. Plasil, H. Büsching, B. K. Nandi, G. Mgebrichvili, S. Kees, T. Peitzmann, U. von Poblotzki, Madan M. Aggarwal, F. E. Obenshain, P.V.K.S. Baba, Y. Miyamoto, Shiv K. Gupta, [No Value] Langbein, B. W. Kolb, A. A. Tsvetkov, [No Value] Otterlund, [No Value] Kosarev, Bolek Wyslouch, K. El Chenawi, A. Buijs, Mrd Majumdar, Susumu Sato, [No Value] Sibiriak, S. K. Badyal, B. Guskov, Bikash Sinha, R. Cherbatchev, A.S. Vodopianov, G. J. van Nieuwenhuizen, P. Donni, D. P. Morrison, W. Pinganaud, [No Value] Chalyshev, Tatsuya Chujo, Y.Y. Lee, T. Svensson, E. Stenlund, J. Urbahn, Y. Schutz, R. Higuchi, G. Martinez, Y. Yokota, Sanjeev Singh Sambyal, [No Value] Hrivnacova, [No Value] Roufanov, and Hiroyuki Sako

Subjects
Nuclear reaction, Nuclear physics, Physics, Particle physics, Pion, Meson, Hadron, General Physics and Astronomy, Elementary particle, Multiplicity (mathematics), Nuclear Experiment, Particle identification, Boson
Abstract

Three-particle correlations have been measured for identified {pi}{sup -} from central 158A GeV Pb+Pb collisions by the WA98 experiment at CERN. A substantial contribution of the genuine three-body correlation has been found as expected for a mainly chaotic and symmetric source.

Published
2000

6. Δ++ production in 158 A GeV 208Pb+208Pb interactions at the CERN SPS

Author

M.M. Aggarwal, A. Agnihotri, Z. Ahammed, A.L.S. Angelis, V. Antonenko, V. Arefiev, V. Astakhov, V. Avdeitchikov, T.C. Awes, P.V.K.S. Baba, S.K. Badyal, A. Baldine, L. Barabach, C. Barlag, S. Bathe, B. Batiounia, T. Bernier, K.B. Bhalla, V.S. Bhatia, C. Blume, R. Bock, E.-M. Bohne, Z. Böröcz, D. Bucher, A. Buijs, H. Büsching, L. Carlen, V. Chalyshev, S. Chattopadhyay, R. Cherbatchev, T. Chujo, A. Claussen, A.C. Das, M.P. Decowski, H. Delagrange, V. Djordjadze, P. Donni, I. Doubovik, S. Dutt, M.R. Dutta Majumdar, K. El Chenawi, S. Eliseev, K. Enosawa, P. Foka, S. Fokin, V. Frolov, M.S. Ganti, S. Garpman, O. Gavrishchuk, F.J.M. Geurts, T.K. Ghosh, R. Glasow, S.K. Gupta, B. Guskov, H.Å. Gustafsson, H.H. Gutbrod, R. Higuchi, I. Hrivnacova, M. Ippolitov, H. Kalechofsky, R. Kamermans, K.-H. Kampert, K. Karadjev, K. Karpio, S. Kato, S. Kees, B.W. Kolb, I. Kosarev, I. Koutcheryaev, T. Krümpel, A. Kugler, P. Kulinich, M. Kurata, K. Kurita, N. Kuzmin, I. Langbein, A. Lebedev, Y.Y. Lee, H. Löhner, L. Luquin, D.P. Mahapatra, V. Manko, M. Martin, G. Martı́nez, A. Maximov, R. Mehdiyev, G. Mgebrichvili, Y. Miake, D. Mikhalev, Md.F. Mir, G.C. Mishra, Y. Miyamoto, B. Mohanty, D. Morrison, D.S. Mukhopadhyay, V. Myalkovski, H. Naef, B.K. Nandi, S.K. Nayak, T.K. Nayak, S. Neumaier, A. Nianine, V. Nikitine, S. Nikolaev, P. Nilsson, S. Nishimura, P. Nomokonov, J. Nystrand, F.E. Obenshain, A. Oskarsson, I. Otterlund, M. Pachr, A. Parfenov, S. Pavliouk, T. Peitzmann, V. Petracek, F. Plasil, W. Pinganaud, M.L. Purschke, J. Rak, R. Raniwala, S. Raniwala, V.S. Ramamurthy, N.K. Rao, F. Retiere, K. Reygers, G. Roland, L. Rosselet, I. Roufanov, C. Roy, J.M. Rubio, H. Sako, S.S. Sambyal, R. Santo, S. Sato, H. Schlagheck, H.-R. Schmidt, Y. Schutz, G. Shabratova, T.H. Shah, I. Sibiriak, T. Siemiarczuk, D. Silvermyr, B.C. Sinha, N. Slavine, K. Söderström, N. Solomey, S.P. Sørensen, P. Stankus, G. Stefanek, P. Steinberg, E. Stenlund, D. Stüken, M. Sumbera, T. Svensson, M.D. Trivedi, A. Tsvetkov, L. Tykarski, J. Urbahn, E.C. van der Pijll, N. van Eijndhoven, G.J. van Nieuwenhuizen, A. Vinogradov, Y.P. Viyogi, A. Vodopianov, S. Vörös, B. Wysłouch, K. Yagi, Y. Yokota, and G.R. Young

Subjects
Physics, Nuclear physics, Delta, Nuclear and High Energy Physics, Particle physics, Large Hadron Collider, Pion, Invariant mass, Chemical equilibrium, Nuclear Experiment
Abstract

The Delta(++)-resonance production in central 158 A GeV Pb-208 + Pb-208 collisions at the CERN SPS has been studied. The Delta(++) production was estimated from the invariant mass spectrum of p pi(+)-pairs by subtracting a mixed event background. The measured Delta(++) abundance is compared with the results from other experiments at lower energies, and with a model calculation assuming thermal and chemical equilibrium. (C) 2000 Elsevier Science B.V. All rights reserved.

Published
2000

7. Two-particle correlations in 158 A GeV collisions

Author

M. P. Decowski, M. R. Dutta Majumdar, V. Astakhov, N. Kuzmin, A. Maximov, D. Stüken, Sudhir Raniwala, J. M. Rubio, I. Langbein, S. Eliseev, M. S. Ganti, Wa Colaboration, A.L.S. Angelis, S. Bathe, E. C. v. d. Pijll, L. Barabach, G. Martínez, M. Kurata, C. Blume, O. P. Gavrishchuk, K. Yagi, A. A. Vinogradov, R. Kamermans, T. Peitzmann, R. Glasow, W. Pinganaud, H. Schlagheck, Subhasis Chattopadhyay, Agneta Oskarsson, D. P. Morrison, MV Manzano Martin, V. Djordjadze, K. Söderström, K. Karadjev, Sergey Fokin, Y. Miyamoto, A.L. Lebedev, B. Batiounia, M. D. Trivedi, Tatsuya Chujo, F. Retiere, Z.K. Böröcz, B. W. Kolb, P. Foka, Klaus Johannes Reygers, Kh Kampert, B. Raeven, Teodor Siemiarczuk, Shiv K. Gupta, Hr Schmidt, R. Cherbatchev, H. Delagrange, G.S. Shabratova, Y. P. Viyogi, Y. Schutz, A. A. Tsvetkov, David Olle Rickard Silvermyr, K. Enosawa, H. H. Gutbrod, P. Kulinich, Nikolai V Slavine, G. C. Mishra, S. Kato, Md. F. Mir, Ivana Hrivnacova, A.S. Vodopianov, K. Kurita, Gerrit Jan van Nieuwenhuizen, T. K. Ghosh, Bolek Wyslouch, I. Doubovik, A. C. Das, Joakim Nystrand, A. Buijs, Vladislav Manko, Krzysztof Karpio, S. K. Nayak, V. S. Ramamurthy, S. P. Sorensen, V. Arefiev, S. Neumaier, Peter M. Nilsson, V. Petráček, Lars Carlén, Jan Rak, R. Santo, C. Barlag, A. Kugler, D. Bucher, I. Roufanov, V. Chalyshev, V. Frolov, P. Donni, K. B. Bhalla, T. H. Shah, Zubayer Ahammed, L. Luquin, S. Dutt, T. Krümpel, T. K. Nayak, F. J M Geurts, E.-M. Bohne, I. Otterlund, S. K. Badyal, S. Garpman, A. Baldine, G. Stefanek, V.G. Antonenko, B. Guskov, Bikash Sinha, A. Claussen, T. C. Awes, G. R. Young, Yasuo Miake, H. A. Gustafsson, R. Mehdiyev, Y.Y. Lee, I. G. Sibiriak, V. Nikitine, A. Parfenov, A. Agnihotri, T. Svensson, Michal Sumbera, E. Stenlund, Susumu Sato, N. Solomey, Basanta Kumar Nandi, L. Tykarski, Sándor Vörös, J. Urbahn, I. Koutcheryaev, S. Pavliouk, F. E. Obenshain, P.V.K.S. Baba, D. Mikhalev, F. Plasil, H. Büsching, G. Mgebrichvili, Petr Nomokonov, S. Nikolaev, Rashmi Raniwala, N. K. Rao, Shunji Nishimura, D. P. Mahapatra, Mikhail Ippolitov, Hyun-Chul Kim, L. Rosselet, P. W. Stankus, Herbert Löhner, D. S. Mukhopadhyay, Gunther Roland, C. Roy, H. Kalechofsky, H. Naef, A. Nianine, N. v. Eijndhoven, V. S. Bhatia, S. Kees, V. Avdeitchikov, Madan M. Aggarwal, V. Myalkovski, P. Steinberg, I. Kosarev, K. El Chenawi, T. Bernier, Martin Purschke, M. Pachr, R. Higuchi, Hiroyuki Sako, Y. Yokota, and Sanjeev Singh Sambyal

Subjects
Physics, Nuclear physics, Nuclear and High Energy Physics, Particle
Published
1999

8. Elliptic emission of K+ and π+ in 158 A·GeV Pb + Pb collisions

Author

M.M. Aggarwal, A. Agnihotri, Z. Ahammed, A.L.S. Angelis, V. Antonenko, V. Arefiev, V. Astakhov, V. Avdeitchikov, T.C. Awes, P.V.K.S. Baba, S.K. Badyal, A. Baldine, L. Barabach, C. Barlag, S. Bathe, B. Batiounia, T. Bernier, K.B. Bhalla, V.S. Bhatia, C. Blume, R. Bock, E.-M. Bohne, Z. Böröcz, D. Bucher, A. Buijs, H. Büsching, L. Carlen, V. Chalyshev, S. Chattopadhyay, R. Cherbatchev, T. Chujo, A. Claussen, A.C. Das, M.P. Decowski, H. Delagrange, V. Djordjadze, P. Donni, I. Doubovik, S. Dutt, M.R. Dutta Majumdar, K. El Chenawi, S. Eliseev, K. Enosawa, P. Foka, S. Fokin, V. Frolov, M.S. Ganti, S. Garpman, O. Gavrishchuk, F.J.M. Geurts, T.K. Ghosh, R. Glasow, S.K. Gupta, B. Guskov, H.Å. Gustafsson, H.H. Gutbrod, R. Higuchi, I. Hrivnacova, M. Ippolitov, H. Kalechofsky, R. Kamermans, K.-H. Kampert, K. Karadjev, K. Karpio, S. Kato, S. Kees, B.W. Kolb, I. Kosarev, I. Koutcheryaev, T. Krümpel, A. Kugler, P. Kulinich, M. Kurata, K. Kurita, N. Kuzmin, I. Langbein, A. Lebedev, Y.Y. Lee, H. Löhner, L. Luquin, D.P. Mahapatra, V. Manko, M. Martin, G. Martı́nez, A. Maximov, R. Mehdiyev, G. Mgebrichvili, Y. Miake, D. Mikhalev, Md.F. Mir, G.C. Mishra, Y. Miyamoto, D. Morrison, B. Mohanty, D.S. Mukhopadhyay, V. Myalkovski, H. Naef, B.K. Nandi, S.K. Nayak, T.K. Nayak, S. Neumaier, A. Nianine, V. Nikitine, S. Nikolaev, P. Nilsson, S. Nishimura, P. Nomokonov, J. Nystrand, F.E. Obenshain, A. Oskarsson, I. Otterlund, M. Pachr, A. Parfenov, S. Pavliouk, T. Peitzmann, V. Petracek, F. Plasil, W. Pinganaud, M.L. Purschke, B. Raeven, J. Rak, R. Raniwala, S. Raniwala, V.S. Ramamurthy, N.K. Rao, F. Retiere, K. Reygers, G. Roland, L. Rosselet, I. Roufanov, C. Roy, J.M. Rubio, H. Sako, S.S. Sambyal, R. Santo, S. Sato, H. Schlagheck, H.-R. Schmidt, Y. Schutz, G. Shabratova, T.H. Shah, I. Sibiriak, T. Siemiarczuk, D. Silvermyr, B.C. Sinha, N. Slavine, K. Söderström, N. Solomey, S.P. Sørensen, P. Stankus, G. Stefanek, P. Steinberg, E. Stenlund, D. Stüken, M. Sumbera, T. Svensson, M.D. Trivedi, A. Tsvetkov, L. Tykarski, J. Urbahn, E.C. v.d. Pijll, N. v. Eijndhoven, G.J. v. Nieuwenhuizen, A. Vinogradov, Y.P. Viyogi, A. Vodopianov, S. Vörös, B. Wysłouch, K. Yagi, Y. Yokota, and G.R. Young

Subjects
Nuclear physics, Azimuth, Physics, Nuclear and High Energy Physics, Meson, Angular correlation, Plane (geometry), Astrophysics::High Energy Astrophysical Phenomena, Anisotropic flow, High Energy Physics::Experiment, Atomic physics, Nuclear Experiment
Abstract

An event-by-event analysis of the azimuthal angular correlation with respect to the reaction plane has been carried out for K+ and pi(+) emission near mid-rapidity in 158 A . GeV Pb + Pb collisions. In semi-central collisions, K+ mesons are found to be preferentially emitted out of the reaction plane, while pi(+) mesons are emitted in the reaction plane. The results suggest that the kaon emission is influenced by in-medium potential effects in addition to collective flow effects. (C) 1999 Published by Elsevier Science B.V. All rights reserved.

Published
1999

9. Recent results from the WA98 experiment

Author

Sukalyan Chattopadhyay, M. S. Ganti, Zubayer Ahammed, S. Pavliouk, H. Kalechofsky, Michal Sumbera, S. K. Badyal, P. Foka, B. Raeven, K. Karadjev, H. Naef, A. Nianine, Hr Schmidt, H. Schlagheck, Bikash Sinha, Basanta Kumar Nandi, Sergey Fokin, A. A. Tsvetkov, I. Kosarev, K. Söderström, E. Stenlund, D. S. Mukhopadhyay, Madan M. Aggarwal, Bolek Wyslouch, Y. Schutz, J. Urbahn, L. Tykarski, S. K. Nayak, S. P. Sorensen, V. S. Bhatia, A. Buijs, P. Steinberg, G. C. Mishra, Y. P. Viyogi, M. R. Dutta Majumdar, Ashim Das, Peter M. Nilsson, I. Otterlund, Hiroyuki Sako, K. Kurita, V. Astakhov, Bedangadas Mohanty, R. Glasow, Joakim Nystrand, Gerrit Jan van Nieuwenhuizen, Vladimir Frolov, A.L. Lebedev, V. Djordjadze, K. Yagi, Teodor Siemiarczuk, K. El Chenawi, R. Higuchi, M. Kurata, T. Bernier, W. Pinganaud, C. Barlag, N. v. Eijndhoven, V. Petráček, Lars Carlén, D. Mikhalev, V. Chalyshev, Shunji Nishimura, Y. Yokota, Sanjeev Singh Sambyal, MV Manzano Martin, T. H. Shah, I. Doubovik, V. Avdeitchikov, I. Koutcheryaev, F. E. Obenshain, P.V.K.S. Baba, M. D. Trivedi, Sudhir Raniwala, Vladislav Manko, B.N. Gus'kov, A. Agnihotri, Y.Y. Lee, H. A. Gustafsson, Kh Kampert, J. M. Rubio, V. Nikitine, I. G. Sibiriak, A. Claussen, T. Svensson, Martin Purschke, R. Kamermans, N. Solomey, B. W. Kolb, M. P. Decowski, R. Santo, Md. F. Mir, Ivana Hrivnacova, V. Myalkovski, Agneta Oskarsson, G. Stefanek, Klaus Johannes Reygers, A. Parfenov, A. Maximov, V. Arefiev, I. Langbein, Mikhail Ippolitov, S. Dutt, T. C. Awes, F. Plasil, H. Büsching, T. K. Nayak, Sergey Nikolaev, S. Eliseev, Krzysztof Karpio, L. Luquin, R. Mehdiyev, F. J M Geurts, S. Garpman, E. C. v. d. Pijll, S. Neumaier, I. Roufanov, H. Delagrange, V.G. Antonenko, Jan Rak, Susumu Sato, A. Baldine, S. Vörös, H. H. Gutbrod, G. Mgebrichvili, David Olle Rickard Silvermyr, A. Kugler, D. P. Mahapatra, Petr Nomokonov, T. Peitzmann, G.S. Shabratova, Rashmi Raniwala, Y. Miyamoto, E.-M. Bohne, Shiv K. Gupta, N. K. Rao, D. Bucher, G. R. Young, A.L.S. Angelis, S. Bathe, A. A. Vinogradov, B. Batiounia, C. Blume, O. P. Gavrishchuk, P. Kulinich, Nikolai V Slavine, V. S. Ramamurthy, N.A. Kuzmin, P. Donni, F. Retiere, R. Cherbatchev, A.S. Vodopianov, L. Barabach, G. Martínez, Yasuo Miake, D. P. Morrison, Tatsuya Chujo, C. Roy, Hyun-Chul Kim, L. Rosselet, Gunther Roland, P. W. Stankus, Herbert Löhner, M. Pachr, K. B. Bhalla, K. Enosawa, S. Kato, and T. K. Ghosh

Subjects
Quantum chromodynamics, Physics, Nuclear and High Energy Physics, Particle physics, Meson, Nuclear Theory, Hadron, Particle identification, Charged particle, Nuclear physics, Pion, Isospin, Rapidity, Nuclear Experiment
Abstract

Recent results of the WA98 experiment with Pb induced reactions at 158. A GeV are presented. The scaling properties of the transverse energy and the charged particle multiplicity at midrapidity with the number of participants is studied. Neutral pion spectra are compared to hydrodynamical parameterizations. The analysis of collective flow at target rapidity and at midrapidity is presented. The status of the study of direct photons and the search for isospin fluctuations is discussed.

Published
1999

10. Freeze-Out Parameters in Central158AGeVP208b+PbCollisions

Author

M. M. Aggarwal, A. Agnihotri, Z. Ahammed, A. L. S. Angelis, V. Antonenko, V. Arefiev, V. Astakhov, V. Avdeitchikov, T. C. Awes, P. V. K. S. Baba, S. K. Badyal, A. Baldine, L. Barabach, C. Barlag, S. Bathe, B. Batiounia, T. Bernier, K. B. Bhalla, V. S. Bhatia, C. Blume, R. Bock, E.-M. Bohne, Z. K. Böröcz, D. Bucher, A. Buijs, H. Büsching, L. Carlen, V. Chalyshev, S. Chattopadhyay, R. Cherbatchev, T. Chujo, A. Claussen, A. C. Das, M. P. Decowski, H. Delagrange, V. Djordjadze, P. Donni, I. Doubovik, S. Dutt, M. R. Dutta Majumdar, K. El Chenawi, S. Eliseev, K. Enosawa, P. Foka, S. Fokin, V. Frolov, M. S. Ganti, S. Garpman, O. Gavrishchuk, F. J. M. Geurts, T. K. Ghosh, R. Glasow, S. K. Gupta, B. Guskov, H. Å. Gustafsson, H. H. Gutbrod, R. Higuchi, I. Hrivnacova, M. Ippolitov, H. Kalechofsky, R. Kamermans, K.-H. Kampert, K. Karadjev, K. Karpio, S. Kato, S. Kees, H. Kim, B. W. Kolb, I. Kosarev, I. Koutcheryaev, T. Krümpel, A. Kugler, P. Kulinich, M. Kurata, K. Kurita, N. Kuzmin, I. Langbein, A. Lebedev, Y. Y. Lee, H. Löhner, L. Luquin, D. P. Mahapatra, V. Manko, M. Martin, G. Martínez, A. Maximov, R. Mehdiyev, G. Mgebrichvili, Y. Miake, D. Mikhalev, Md. F. Mir, G. C. Mishra, Y. Miyamoto, D. Morrison, D. S. Mukhopadhyay, V. Myalkovski, H. Naef, B. K. Nandi, S. K. Nayak, T. K. Nayak, S. Neumaier, A. Nianine, V. Nikitine, S. Nikolaev, P. Nilsson, S. Nishimura, P. Nomokonov, J. Nystrand, F. E. Obenshain, A. Oskarsson, I. Otterlund, M. Pachr, A. Parfenov, S. Pavliouk, T. Peitzmann, V. Petracek, F. Plasil, W. Pinganaud, M. L. Purschke, B. Raeven, J. Rak, R. Raniwala, S. Raniwala, V. S. Ramamurthy, N. K. Rao, F. Retiere, K. Reygers, G. Roland, L. Rosselet, I. Roufanov, C. Roy, J. M. Rubio, H. Sako, S. S. Sambyal, R. Santo, S. Sato, H. Schlagheck, H.-R. Schmidt, Y. Schutz, G. Shabratova, T. H. Shah, I. Sibiriak, T. Siemiarczuk, D. Silvermyr, B. C. Sinha, N. Slavine, K. Söderström, N. Solomey, S. P. Sørensen, P. Stankus, G. Stefanek, P. Steinberg, E. Stenlund, D. Stüken, M. Sumbera, T. Svensson, M. D. Trivedi, A. Tsvetkov, L. Tykarski, J. Urbahn, E. C. v. d. Pijll, N. v. Eijndhoven, G. J. v. Nieuwenhuizen, A. Vinogradov, Y. P. Viyogi, A. Vodopianov, S. Vörös, B. Wysłouch, K. Yagi, Y. Yokota, and G. R. Young

Subjects
Nuclear reaction, Physics, Meson, Nuclear Theory, Hadron, General Physics and Astronomy, Elementary particle, Super Proton Synchrotron, Nuclear physics, Pion, Mass spectrum, Transverse mass, Atomic physics, Nuclear Experiment
Abstract

Neutral pion production in central 158A GeV [sup 208]Pb+ [sup 208] Pb collisions has been studied in the WA98 experiment at the CERN Super Proton Synchrotron. The [pi][sup 0] transverse mass spectrum has been analyzed in terms of a thermal model with hydrodynamic expansion. The high accuracy and large kinematic coverage of the measurement allow one to limit previously noted ambiguities in the extracted freeze-out parameters. The results are shown to be sensitive to the shape of the velocity distribution at freeze-out. [copyright] [ital 1999] [ital The American Physical Society ]

Published
1999

11. Direct photon production in high-energy heavy-ion collisions

Author

V. Manko, M.M. Aggarwal, A. Agnihotri, Z. Ahammed, A.L.S. Angelis, V. Antonenko, V. Arefiev, V. Astakhov, V. Avdeitchikov, T.C. Awes, P.V.K.S. Baba, S.K. Badyal, A. Baldine, L. Barabach, C. Barlag, S. Bathe, B. Batiounia, T. Bernier, K.B. Bhalla, V.S. Bhatia, C. Blume, R. Bock, E.-M. Bohne, Z. Böröcz, D. Bucher, A. Buijs, H. Büsching, L. Carlen, V. Chalyshev, S. Chattopadhyay, R. Cherbatchev, T. Chujo, A. Claussen, A.C. Das, M.P. Decowski, V. Djordjadze, P. Donni, I. Doubovik, S. Dutt, M.R. Dutta Majumdar, K. El Chenawi, S. Eliseev, K. Enosawa, P. Foka, S. Fokin, V. Frolov, M.S. Ganti, S. Garpman, O. Gavrishchuk, F.J.M. Geurts, T.K. Ghosh, R. Glasow, S.K. Gupta, B. Guskov, H.A Gustafsson, H.H. Gutbrod, R. Higuchi, I. Hrivnacova, M. Ippolitov, H. Kalechofsky, R. Kamermans, K.-H. Kampert, K. Karadjev, K. Karpio, S. Kato, S. Kees, H. Kim, B.W. Kolb, I. Kosarev, I. Koutcheryaev, T. Krümpel, A. Kugler, P. Kulinich, M. Kurata, K. Kurita, N. Kuzmin, I. Langbein, A. Lebedev, Y.Y. Lee, H. Löhner, L. Luquin, D.P. Mahapatra, M. Martin, A. Maximov, R. Mehdiyev, G. Mgebrichvili, Y. Miake, D. Mikhalev, Md.F. Mir, G.C. Mishra, Y. Miyamoto, D. Morrison, D.S. Mukhopadhyay, V. Myalkovski, H. Naef, B.K. Nandi, S.K. Nayak, T.K. Nayak, S. Neumaier, A. Nianine, V. Nikitine, S. Nikolaev, P. Nilsson, S. Nishimura, P. Nomokonov, J. Nystrand, F.E. Obenshain, A. Oskarsson, I. Otterlund, M. Pachr, A. Parfenov, S. Pavliouk, T. Peitzmann, V. Petracek, F. Plasil, W. Pinanaud, M.L. Purschke, B. Raeven, J. Rak, R. Raniwala, S. Raniwala, V.S. Ramamurthy, N.K. Rao, F. Retiere, K. Reygers, G. Roland, L. Rosselet, I. Roufanov, C. Roy, J.M. Rubio, H. Sako, S.S. Sambyal, R. Santo, S. Sato, H. Schlagheck, H.-R. Schmidt, G. Shabratova, T.H. Shah, I. Sibiriak, T. Siemiarczuk, D. Silvermyr, B.C. Sinha, N. Slavine, K. Söderström, N. Solomey, S.P. Sørensen, P. Stankus, G. Stefanek, P. Steinberg, E. Stenlund, D. Stüken, M. Sumbera, T. Svensson, M.D. Trivedi, A. Tsvetkov, L. Tykarski, J. Urbahn, E.C.v.d. Pijll, N.v. Eijndhoven, G.J.v. Nieuwenhuizen, A. Vinogradov, Y.P. Viyogi, A. Vodopianov, S. Vörös, B. Wyslouch, K. Yagi, Y. Yokota, and G.R. Young

Subjects
Massless particle, Physics, Nuclear physics, Nuclear reaction, Nuclear and High Energy Physics, Strange matter, Photon, Hadron, Two-photon physics, Elementary particle, Atomic physics, Particle detector
Published
1999

12. Centrality Dependence of Neutral Pion Production in158AGeVP208b+P208bCollisions

Author

M. M. Aggarwal, A. Agnihotri, Z. Ahammed, A. L. S. Angelis, V. Antonenko, V. Arefiev, V. Astakhov, V. Avdeitchikov, T. C. Awes, P. V. K. S. Baba, S. K. Badyal, A. Baldine, L. Barabach, C. Barlag, S. Bathe, B. Batiounia, T. Bernier, K. B. Bhalla, V. S. Bhatia, C. Blume, R. Bock, E.-M. Bohne, Z. K. Böröcz, D. Bucher, A. Buijs, H. Büsching, L. Carlen, V. Chalyshev, S. Chattopadhyay, R. Cherbatchev, T. Chujo, A. Claussen, A. C. Das, M. P. Decowski, V. Djordjadze, P. Donni, I. Doubovik, M. R. Dutta Majumdar, K. El Chenawi, S. Eliseev, K. Enosawa, P. Foka, S. Fokin, V. Frolov, M. S. Ganti, S. Garpman, O. Gavrishchuk, F. J. M. Geurts, T. K. Ghosh, R. Glasow, S. K. Gupta, B. Guskov, H. A. Gustafsson, H. H. Gutbrod, R. Higuchi, I. Hrivnacova, M. Ippolitov, H. Kalechofsky, R. Kamermans, K.-H. Kampert, K. Karadjev, K. Karpio, S. Kato, S. Kees, H. Kim, B. W. Kolb, I. Kosarev, I. Koutcheryaev, T. Krümpel, A. Kugler, P. Kulinich, M. Kurata, K. Kurita, N. Kuzmin, I. Langbein, A. Lebedev, Y. Y. Lee, H. Löhner, L. Luquin, D. P. Mahapatra, V. Manko, M. Martin, A. Maximov, R. Mehdiyev, G. Mgebrichvili, Y. Miake, D. Mikhalev, G. C. Mishra, Y. Miyamoto, D. Morrison, D. S. Mukhopadhyay, V. Myalkovski, H. Naef, B. K. Nandi, S. K. Nayak, T. K. Nayak, S. Neumaier, A. Nianine, V. Nikitine, S. Nikolaev, P. Nilsson, S. Nishimura, P. Nomokonov, J. Nystrand, F. E. Obenshain, A. Oskarsson, I. Otterlund, M. Pachr, A. Parfenov, S. Pavliouk, T. Pietzmann, V. Patracek, W. Pinanaud, F. Plasil, M. L. Purschke, B. Raeven, J. Rak, R. Raniwala, S. Raniwala, V. S. Ramamurthy, N. K. Rao, F. Retiere, K. Reygers, G. Roland, L. Rosselet, I. Roufanov, C. Roy, J. M. Rubio, H. Sako, S. S. Sambyal, R. Santo, S. Sato, H. Schlagheck, H.-R. Schmidt, G. Shabratova, I. Sibiriak, T. Siemiarczuk, D. Silvermyr, B. C. Sinha, N. Slavine, K. Söderström, N. Solomey, S. P. Sørensen, P. Stankus, G. Stefanek, P. Steinberg, E. Stenlund, D. Stüken, M. Sumbera, T. Svensson, M. D. Trivedi, A. Tsvetkov, C. Twenhöfel, L. Tykarski, J. Urbahn, N. v. Eijndhoven, G. J. v. Nieuwenhuizen, A. Vinogradov, Y. P. Viyogi, A. Vodopianov, S. Vörös, B. Wysłouch, K. Yagi, Y. Yokota, and G. R. Young

Subjects
Nuclear reaction, Physics, Particle physics, Meson, Nuclear Theory, Hadron, General Physics and Astronomy, Elementary particle, Super Proton Synchrotron, Nuclear physics, Pion, Production (computer science), Nuclear Experiment, Nucleon
Abstract

The production of neutral pions in 158A GeV {sup 208}Pb+ {sup 208}Pb collisions has been studied in the WA98 experiment at the CERN Super Proton Synchrotron (SPS). Transverse momentum spectra are studied for the range 0.3{le}m{sub T}{minus}m{sub 0}{le}4.0 GeV /c . The results for central collisions are compared to various models. The centrality dependence of the neutral pion spectral shape and yield is investigated. An invariance of the spectral shape and a simple scaling of the yield with the number of participating nucleons is observed for centralities with greater than about 30thinspthinspparticipating nucleons. This is most naturally explained by assuming an equilibrated system. {copyright} {ital 1998} {ital The American Physical Society }

Published
1998

13. Recent results on Pb+Pb collisions at 158 AGeV from the WA98 experiment at CERN

Author

B. Wyslouch, M.M. Aggarwal, A. Agnihotri, Z. Ahammed, A.L.S. Angelis, V. Antonenko, V. Arefiev, V. Astakhov, V. Avdeitchikov, T.C. Awes, P.V.K.S. Baba, S.K. Badyal, A. Baldine, L. Barabach, C. Barlag, S. Bathe, B. Batiounia, T. Bernier, K.B. Bhalla, V.S. Bhatia, C. Blume, R. Bock, E.-M. Bohne, D. Bucher, A. Buijs, E.-J. Buis, H. Büsching, L. Carlen, V. Chalyshev, S. Chattopadhyay, R. Cherbatchev, T. Chujo, A. Claussen, A.C. Das, M.P. Decowski, V. Djordjadze, P. Donni, I. Doubovik, M.R. Dutta Majumdar, K. El Chenawi, S. Eliseev, K. Enosawa, H. Feldmann, P. Foka, S. Fokin, V. Frolov, M.S. Ganti, S. Garpman, O. Gavrishchuk, F.J.M. Geurts, T.K. Ghosh, R. Glasow, S.K. Gupta, B. Guskov, H.A. Gustafsson, H.H. Gutbrod, R. Higuchi, I. Hrivnacova, M. Ippolitov, H. Kalechofsky, R. Kamermans, K.-H. Kampert, K. Karadjev, K. Karpio, S. Kato, S. Kees, H. Kim, B.W. Kolb, I. Kosarev, I. Koutcheryaev, A. Kugler, P. Kulinich, V. Kumar, M. Kurata, K. Kurita, N. Kuzmin, I. Langbein, A. Lebedev, Y.Y. Lee, H. Löhner, D.P. Mahapatra, V. Manko, M. Martin, A. Maximov, R. Mehdiyev, G. Mgebrichvili, Y. Miake, D. Mikhalev, G.C. Mishra, Y. Miyamoto, D. Morrison, D.S. Mukhopadhyay, V. Myalkovski, H. Naef, B.K. Nandi, S.K. Nayak, T.K. Nayak, S. Neumaier, A. Nianine, V. Nikitine, S. Nikolaev, P. Nilsson, S. Nishimura, P. Nomokov, J. Nystrand, F.E. Obenshain, A. Oskarsson, I. Otterlund, M. Pachr, A. Parfenov, S. Pavliouk, T. Peitzmann, V. Petracek, F. Plasil, M.L. Purschke, B. Raeven, J. Rak, S. Raniwala, V.S. Ramamurthy, N.K. Rao, F. Retiere, K. Reygers, G. Roland, L. Rosselet, I. Roufanov, J.M. Rubio, S.S. Sambyal, R. Santo, S. Sato, H. Schlagheck, H.-R. Schmidt, G. Shabratova, I. Sibiriak, T. Siemiarczuk, D. Silvermyr, B.C. Sinha, N. Slavine, K. Söderström, N. Solomey, S.P. Sørensen, P. Stankus, G. Stefanek, P. Steinberg, E. Stenlund, D. Stüken, M. Sumbera, T. Svensson, M.D. Trivedi, A. Tsvetkov, C. Twenhöfel, L. Tykarski, J. Urbahn, N.v. Eijndhoven, W.H.v. Heeringen, G.J.v. Nieuwenhuizen, A. Vinogradov, Y.P. Viyogi, A. Vodopianov, S. Vörös, M.A. Vos, K. Yagi, Y. Yokota, and G.R. Young

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Photon, Large Hadron Collider, Spectrometer, Physics::Instrumentation and Detectors, Hadron, Spectral line, Particle identification, Calorimeter, Nuclear physics, Nuclear Experiment, Neutral particle
Abstract

We present recent results obtained with the WA98 experiment at CERN SPS. The experiment consists of large acceptance hadron and photon spectrometers which allow to study many aspects of heavy ion collisions. We use event-by-event measurements of charged and neutral particle multiplicity to establish the limit on the prodution of Disoriented Chiral Condensates. We use the Plastic Ball detector together with a set of tracking chambers to study collective flow. The tracking chambers together with the excellent particle identification allow us to study the production of Δ ++ . The high resolution photon calorimeter array allows us to study inclusive photon and π 0 spectra and search for excess direct photons.

Published
1998

14. Collective flow in 158AGeV Pb+Pb collisions

Author

K. Söderström, A. Claussen, Evert Anders Stenlund, T. Siemiarczuk, B.N. Gus'kov, A. Agnihotri, Y. Yokota, I. Doubovik, A. C. Das, I. Koutcheryaev, F. E. Obenshain, P.V.K.S. Baba, H. Kalechofsky, H. Naef, Vladislav Manko, I. Roufanov, F. Retiere, E.J. Buis, A. Nianine, N. v. Eijndhoven, C. Blume, R. Mehdiyev, N. Solomey, Susumu Sato, P. Foka, B. Raeven, S. Vörös, V. S. Bhatia, S. Garpman, G.S. Shabratova, Agneta Oskarsson, O. P. Gavrishchuk, A. A. Tsvetkov, Bolek Wyslouch, A. Buijs, Joakim Nystrand, H. A. Gustafsson, S. Kees, Hr Schmidt, P. Kulinich, Nikolai V Slavine, V. Avdeitchikov, K.E. Chenawi, M. P. Decowski, Klaus Johannes Reygers, N.A. Kuzmin, D. Mikhalev, P. Donni, D. Bucher, Marcel Vos, Sudhir Raniwala, J. M. Rubio, Martin Purschke, H.H. Gutbrod, K. Kurita, S. K. Nayak, Michal Sumbera, C. Barlag, V. Djordjadze, Herbert Löhner, G. Stefanek, V. S. Ramamurthy, Paul Stankus, G. C. Mishra, Shunji Nishimura, V. Chalyshev, H. Schlagheck, S. Neumaier, Gunther Roland, I. Kosarev, T. K. Ghosh, D. S. Mukhopadhyay, Petr Nomokonov, H. Feldmann, L. Tykarski, A. Kugler, A.L.S. Angelis, S. P. Sorensen, Mikhail Ippolitov, I. Otterlund, W.H.v. Heeringen, F.J.M. Guerts, M. Pachr, K. Yagi, A. Baldine, R. Kamermans, T. Bernier, A. Parfenov, Madan M. Aggarwal, S. Bathe, R. Cherbatchev, A. Lebedev, Yasuo Miake, Vladimir Frolov, I. Sibiriak, R. Glasow, A.S. Vodopianov, Hyun-Chul Kim, D. P. Mahapatra, N. K. Rao, L. Rosselet, V. Petráček, Lars Carlén, V. Myalkovski, M. R. Dutta Majumdar, V. Astakhov, R. K. Bock, F. Plasil, A. Maximov, D. Stüken, I. Langbein, L. Barabach, H. Büsching, A. A. Vinogradov, Sergey Nikolaev, K. Karadjev, D. Bock, S. Eliseev, D. P. Morrison, Sergey Fokin, K. Enosawa, S. Pavliouk, G. Mgebrichvili, Tatsuya Chujo, Kh Kampert, S. Kato, Y. P. Viyogi, V.G. Antonenko, Zubayer Ahammed, V. Kumar, M. Kurata, R. Santo, Sukalyan Chattopadhyay, M. S. Ganti, B. Batiounia, S. K. Badyal, MV Manzano Martin, M. D. Trivedi, B. W. Kolb, T. K. Nayak, K. B. Bhalla, Bikash Sinha, P. Steinberg, Ivana Hrivnacova, V. Arefiev, T. C. Awes, T. Peitzmann, Y. Miyamoto, Shiv K. Gupta, Krzysztof Karpio, Jan Rak, E.-M. Bohne, G. R. Young, C. Twenhöfel, Gerrit Jan van Nieuwenhuizen, R. Higuchi, Y.Y. Lee, V. Nikitine, T. Svensson, Sanjeev Singh Sambyal, Basanta Kumar Nandi, J. Urbahn, and Hiroyuki Sako

Subjects
Physics, Nuclear and High Energy Physics, Spectrometer, Nuclear Theory, Elliptic flow, Nuclear physics, Transverse plane, Angular distribution, Flow (mathematics), Transverse momentum, Rapidity, Atomic physics, Nuclear Experiment, Anisotropy
Abstract

Anisotropic transverse flow has been studied with a magnetic spectrometer at midrapidity and the Plastic Ball detector at target rapidity in the WA98 experiment. Our preliminary results show the existence of directed and elliptic flow in semi-central Pb+Pb collisions. The magnitude of the directed flow is found to be significantly smaller than those observed at the AGS energies.

Published
1998

15. The PHENIX experiment at RHIC

Author

D.P. Morrison, Y. Akiba, O. Alford, M. Allen, W. Allen, G. Alley, Y. Arai, J.B. Archuleta, J.R. Archuleta, S.H. Aronson, I. Statekin, D. Autrey, T.C. Awes, C. Barlag, J. Barrette, B. Bassalleck, S. Bathe, Y. Batygin, V. Baublis, A. Bazilevsky, R. Begay, J. Behrendt, S. Belikov, S. Bellavia, S. Belyaev, M.J. Bennett, Y. Berdnikov, J. Bernardin, D.D. Bluhm, C. Blume, E.M. Bohne, J.G. Boissevain, E. Bosze, J. Bowers, J. Branning, C.L. Britton, M.L. Brooks, W.L. Bryan, D. Bucher, H. Buesching, V. Bumazhnov, G. Bunce, S. Butsyk, M. Cafferty, T.A. Carey, P. Chand, J. Chang, W.-C. Chang, R. Chappell, S.K. Charagi, L.L. Chavez, S. Chernichenko, C.-Y. Chi, J. Chiba, A. Chikanian, R.K. Choudhury, M.S. Chung, V. Cianciolo, D. Clark, A. Claussen, S. Coe, B. Cole, R. Conway, L. Cope, D. Crook, H. Cunitz, R. Cunningham, S.Q. Daniel, G. David, A. Denisov, E.J. Desmond, O. Dietzsch, B.V. Dinesh, S. Durrant, A. Durum, D. Dutta, Y.V. Efremenko, S. Eiseman, M.S. Emery, K. Enosawa, H. En'yo, M.N. Ericson, V. Evseev, J. Ferriera, D.E. Fields, K. Filimonov, S. Fokin, D. Fong, Z. Fraenkel, S.S. Frank, A.D. Frawley, J. Fried, S.Y. Fung, D. Gan, J. Gannon, S. Gavin, T.F. Gee, B. Gim, Y. Goto, S.V. Greene, S.K. Gupta, W. Guryn, H.-A. Gustafsson, Y. Gutnikov, J.S. Haggerty, S. Hahn, J.W. Halliwell, H. Hamagaki, H. Hara, J. Harder, A. Harvey, K. Hatanaka, R. Hayano, N. Hayashi, H. Hayashi, R. Hazel, X.C. He, H.W. van Hecke, N. Heine, S. Held, T.K. Hemmick, M. Hibino, J.S. Hicks, R. Higuchi, J.C. Hill, T. Hirano, R. Holmes, B. Hong, R. Hutter, T. Ichihara, M. Ikeno, K. Imai, M. Inaba, M. Ippolitov, M. Ishihara, T. Ishikawa, Y. Iwata, B. Jacak, G. Jackson, C. Jacobs, D. Jaffe, U. Jagadish, G. James, B.M. Johnson, J.W. Johnson, S. Johnson, R.G. Jones, J.P. Jones, S. Kahn, Y.A. Kamyshkov, A. Kandasamy, M. Kaneta, J.H. Kang, M. Kann, S.S. Kapoor, J. Kapustinsky, K. Karadjev, T. Katayama, S. Kato, T. Kawaguchi, W.L. Kehoe, M.A. Kelley, M. Kennedy, E.J. Kennedy, A. Khanzadeev, A. Khomoutnikov, J. Kikuchi, S.Y. Kim, Y.G. Kim, W.W. Kinnison, P.N. Kirk, E. Kistenev, A. Kiyomichi, S. Klinksiek, C. Knapp, L. Kochenda, V.I. Kochetkov, T. Kohama, B. Komkov, V. Kozlov, T. Kozlowski, P.J. Kroon, L. Kudin, S. Kumar, M. Kurata, V. Kuriatkov, K. Kurita, G.S. Kyle, J.G. Lajoie, A. Landran, A. Lebedev, V. Lebedev, D.M. Lee, K.S. Lee, S.J. Lee, M.J. Leitch, Q. Li, Z. Li, M. Libkind, S.X. Lin, R. Lind, X. Liu, J. Lowe, C.F. Maguire, Y.I. Makdisi, A. Makeev, V.V. Makeev, V. Manko, Y. Mao, L.J. Marek, S.K. Mark, D. Markushin, R. Martin, M. Marx, A. Masaike, T. Matsumoto, K. McCabe, J. McClelland, P.L. McGaughey, R. McGrath, D.E. McMillan, J.A. Mead, E. Melnikov, Y. Miake, N. Miftakhov, T.J. Miller, A. Milov, K. Minuzzo, J.T. Mitchell, Y. Miyamoto, O. Miyamura, A.K. Mohanty, M. Montag, J.A. Moore, C. Morris, L.J. Morrison, C. Moscone, J.M. Moss, S.T. Mulhall, L. Mullins, M.M. Murray, M.S. Musrock, S. Nagamiya, Y. Nagasaka, J.L. Nagle, Y. Nakada, T. Nayak, J.A. Negrin, L. Nikkinen, S. Nikolaev, P. Nilsson, S. Nishimura, J.W. Noe, A. Nianine, F. Obenshain, E. O'Brien, P. O'Connor, H. Ohnishi, I.D. Ojha, M. Okamura, V. Onuchin, A. Oskarsson, L. Osterman, I. Otterlund, K. Oyama, L. Paffrath, R. Palmer, C. Pancake, V. Pantuev, V. Papavassiliou, J.H. Park, B. Pasmantirer, S.F. Pate, A. Patwa, P. Paul, C. Pearson, T. Peitzmann, V. Penumetcha, V. Perevoztchikov, R. Petersen, G. Petitt, A. Petridis, R.P. Pisani, P. Pitukhin, F. Plasil, M. Pollack, K. Pope, A. Posey, R. Prigl, M.L. Purschke, Y. Qi, D.E. Quigley, S. Rankowitz, G.S. Rao, I. Ravinovich, K. Read, K. Reygers, Y. Riabov, V. Riabov, G. Richardson, S.H. Robinson, J. Romanski, M. Rosati, E. Roschin, A.A. Rose, S.S. Ryu, N. Saito, T. Sakaguchi, A. Sakaguchi, Y. Sakemi, H. Sako, T. Sakuma, S. Salomone, V. Samsonov, C. Sangster, R. Santo, O. Sasaki, H.D. Sato, S. Sato, H. Satoh, H. Schlagheck, B.R. Schlei, R. Schleuter, J. Schmidt, V. Semenov, R. Seto, T.K. Shea, I. Shein, V. Shelikhov, T.-A. Shibata, K. Shigaki, T. Shiina, T. Shimada, I. Sibiriak, K.S. Sim, J. Simon-Gillo, M.L. Simpson, C.P. Singh, V. Singh, F.W. Sippach, H.D. Skank, G.A. Sleege, N. Smirnov, D.E. Smith, G. Smith, M.C. Smith, R. Smith, W. Smith, K. Soderstrom, S. Soeding, A. Soldatov, G. Solodov, W.E. Sondheim, S.P. Sorensen, P.W. Stankus, N. Starinski, E. Stenlund, D. Stueken, W. Stokes, S.P. Stoll, R. Stotzer, T. Sugitate, J.P. Sullivan, Y. Sumi, Z. Sun, T. Svensson, E.M. Takagui, Y. Takahashi, Y. Takata, A. Taketani, K.H. Tanaka, Y. Tanaka, E. Taniguchi, M.J. Tannenbaum, V. Tarakanov, O. Tarasenkova, O. Teodorescu, S. Teruhi, J. Thomas, J.L. Thomas, T.L. Thomas, W.D. Thomas, W. Tian, T. Tominaka, S. Tonse, H. Torii, A. Trivedi, I. Tserruya, A. Tsvetkov, S.K. Tuli, K. Tung, G.W. Turner, N. Tyurin, B. Uppiliappan, S. Urasawa, A. Usachev, H. Uto, C. Vaa, R.I. Vandermolen, A. Vasiliev, T. Vercelli, W. Verhoeven, A. Vinogradov, V. Vishnevskii, R. Vogt, M. Volkov, A. Vorobyov, E. Vznuzdaev, N. Wagner, J.W. Walker, Z.-F. Wang, Y. Watanabe, X. Wei, S.N. White, D. Whitehouse, V. Williamson, A.L. Wintenberg, C. Witzig, F.K. Wohn, D.M. Wolfe, B.G. Wong-Swanson, W. Wong, C.L. Woody, J. Writt, H. Wu, M. Xiao, G. Xu, K. Yagi, R. Yamamoto, Y. Ye, A. Yokoro, Y. Yokota, G.R. Young, W.A. Zajc, L. Zhang, S. Zhou, Q. Zhu, and C. Zou

Subjects
Physics, High Energy Physics - Experiment (hep-ex), Nuclear and High Energy Physics, Particle physics, Luminosity (scattering theory), FOS: Physical sciences, Nuclear Experiment (nucl-ex), PHENIX detector, Nuclear Experiment, High Energy Physics - Experiment
Abstract

The physics emphases of the PHENIX collaboration and the design and current status of the PHENIX detector are discussed. The plan of the collaboration for making the most effective use of the available luminosity in the first years of RHIC operation is also presented., Comment: 5 pages, 1 figure. Further details of the PHENIX physics program available at http://www.rhic.bnl.gov/phenix/

Published
1998

16. Search for disoriented chiral condensates in 158 AGeV Pb+Pb collisions

Author

M.M Aggarwal, A Agnihotri, Z Ahammed, A.L.S Angelis, V Antonenko, V Arefiev, V Astakhov, V Avdeitchikov, T.C Awes, P.V.K.S Baba, S.K Badyal, A Baldine, L Barabach, C Barlag, S Bathe, B Batiounia, T Bernier, K.B Bhalla, V.S Bhatia, C Blume, R Bock, E.-M Bohne, D Bucher, A Buijs, E.-J Buis, H Büsching, L Carlen, V Chalyshev, S Chattopadhyay, R Cherbatchev, T Chujo, A Claussen, A.C Das, M.P Decowski, V Djordjadze, P Donni, I Doubovik, M.R Dutta Majumdar, K El Chenawi, S Eliseev, K Enosawa, P Foka, S Fokin, V Frolov, M.S Ganti, S Garpman, O Gavrishchuk, F.J.M Geurts, T.K Ghosh, R Glasow, S.K Gupta, B Guskov, H.A Gustafsson, H.H Gutbrod, R Higuchi, I Hrivnacova, M Ippolitov, H Kalechofsky, R Kamermans, K.-H Kampert, K Karadjev, K Karpio, S Kato, S Kees, H Kim, B.W Kolb, I Kosarev, I Koutcheryaev, A Kugler, P Kulinich, V Kumar, M Kurata, K Kurita, N Kuzmin, I Langbein, A Lebedev, Y.Y Lee, H Löhner, L Luquin, D.P Mahapatra, V Manko, M Martin, A Maximov, R Mehdiyev, G Mgebrichvili, Y Miake, D Mikhalev, G.C Mishra, Y Miyamoto, D Morrison, D.S Mukhopadhyay, V Myalkovski, H Naef, B.K Nandi, S.K Nayak, T.K Nayak, S Neumaier, A Nianine, V Nikitine, S Nikolaev, S Nishimura, P Nomokonov, J Nystrand, F.E Obenshain, A Oskarsson, I Otterlund, M Pachr, A Parfenov, S Pavliouk, T Peitzmann, V Petracek, F Plasil, M.L Purschke, B Raeven, J Rak, S Raniwala, V.S Ramamurthy, N.K Rao, F Retiere, K Reygers, G Roland, L Rosselet, I Roufanov, C Roy, J.M Rubio, H Sako, S.S Sambyal, R Santo, S Sato, H Schlagheck, H.-R Schmidt, G Shabratova, I Sibiriak, T Siemiarczuk, B.C Sinha, N Slavine, K Söderström, N Solomey, S.P Sørensen, P Stankus, G Stefanek, P Steinberg, E Stenlund, D Stüken, M Sumbera, T Svensson, M.D Trivedi, A Tsvetkov, C Twenhöfel, L Tykarski, J Urbahn, N v. Eijndhoven, W.H v. Heeringen, G.J v. Nieuwenhuizen, A Vinogradov, Y.P Viyogi, A Vodopianov, S Vörös, M.A Vos, B Wysłouch, K Yagi, Y Yokota, G.R Young, and Research unit Nuclear & Hadron Physics

Subjects
Physics, Nuclear and High Energy Physics, Chiral symmetry, Particle physics, SIMPLE (dark matter experiment), Phase transition, Large Hadron Collider, Photon, Hadron, Nuclear Theory, FOS: Physical sciences, Central region, QCD, High Energy Physics - Experiment, ENERGY, High Energy Physics - Experiment (hep-ex), Pion, CERN, PHASE-TRANSITION, Nuclear Experiment, DETECTOR, Particle Physics - Experiment
Abstract

The restoration of chiral symmetry and its subsequent breaking through a phase transition has been predicted to create regions of Disoriented Chiral Condensates (DCC). This phenomenon has been predicted to cause anomalous fluctuations in the relative production of charged and neutral pions in high-energy hadronic and nuclear collisions. The WA98 experiment has been used to measure charged and photon multiplicities in the central region of 158 AGeV Pb+Pb collisions at the CERN SPS. In a sample of 212646 events, no clear DCC signal can be distinguished. Using a simple DCC model, we have set a 90% C.L. upper limit on the maximum DCC production allowed by the data., 20 Pages, LaTeX, uses elsart.cls, 8 eps figures included, submitted to Physics Letters B

Published
1998

17. Azimuthal anisotropy in S + Au reactions at 200 A GeV

Author

M.M. Aggarwal, A.L.S. Angelis, V. Antonenko, T.C. Awes, S.K. Badyal, C. Barlag, K.B. Bhalla, V.S. Bhatia, C. Blume, D. Bock, E.-M. Bohne, D. Bucher, A. Buijs, S. Chattopadhyay, A. Claussen, G. Clewing, A.C. Das, null Devanand, P. Dönni, E. Durieux, M.R. Dutta Majumdar, P. Foka, S. Fokin, M.S. Ganti, S. Garpman, F. Geurts, T.K. Ghosh, R. Glasow, S.K. Gupta, H.-Å. Gustafsson, H.H. Gutbrod, M. Hartig, Xiaochun He, G. Hölker, M. Ippolitov, M. Izycki, S. Kachroo, H. Kalechofsky, R. Kamermans, K.-H. Kampert, K. Karadjev, B.W. Kolb, I. Langbein, J. Langheinrich, A. Lebedev, H. Löhner, S. Loknathan, V. Manko, M. Martin, I.S. Mittra, S. Mookerjee, H. Naef, S.K. Nayak, T.K. Nayak, S. Nikolaev, J. Nystrand, F.E. Obenshain, A. Oskarsson, I. Otterlund, T. Peitzmann, F. Plasil, M. Purschke, S. Raniwala, N.K. Rao, L. Rosselet, B. Roters, J.M. Rubio, S. Saini, S. Sambyal, R. Santo, H.R. Schmidt, T. Siemiarczuk, R.H. Siemssen, B.C. Sinha, S. Slegt, K. Söderström, N. Solomey, S.P. Sorensen, G. Stefanek, P. Steinhaeuser, E. Stenlund, A. Ster, D. Stüken, M.D. Trivedi, C. Twenhoefel, N. Van Eijndhoven, W.H. Van Heeringen, A. Vinogradov, Y.P. Viyogi, S. Weber, G.R. Young, KVI - Center for Advanced Radiation Technology, Research unit Nuclear & Hadron Physics, Angelis, Aris, Donni, Paul, Durieux, Eric Marie Geoffroy, Foka, Panagiota, Kalechofsky, Hal, Martin, Michel, Naef, Hanspeter, Rosselet, Laurent, Rubio, Juan Miguel, and Solomey, Nickolas

Subjects
Physics, Nuclear and High Energy Physics, Photon, biology, Physics::Instrumentation and Detectors, COLLECTIVE FLOW, Detector, Venus, ddc:500.2, HEAVY-ION COLLISIONS, biology.organism_classification, ENERGY, Azimuth, Nuclear physics, NUCLEUS COLLISIONS, Multiplicity (chemistry), Nuclear Experiment, Anisotropy, Fourier series, Event generator
Abstract

Azimuthal correlations of photons produced at mid-rapidity in 200 A GeV S + Au collisions have been studied using a preshower photon multiplicity detector in the WA93 experiment. The Fourier expansion method has been employed to estimate the event plane via the anisotropy of the event as a function of centrality. The event plane correlation technique has been used to determine the true event anisotropy, beyond the anisotropy which arises due to finite multiplicity. The VENUS event generator with rescattering and proper simulation of the detector response can explain only a portion of the observed anisotropy. The residual anisotropy is found to be of the order of 5% for semi-central collisions. This suggests that directed collective flow of the produced particles is present at SPS energies. (C) 1997 Published by Elsevier Science B.V.

Published
1997

18. First evidence of directed flow at 158 A GeV Pb+Pb collisions in WA98 experiment

Author

Mizuki Kurata, M. M. Aggarwal, A. Agnihotri, Z. Ahammed, A. L. S. Angelis, V. Antonenko, V. Arefiev, V. Astakhov, V. Avdeitchikov, T. C. Awes, P. V. K. S. Baba, S. K. Badyal, A. Baldine, L. Barabach, C. Barlag, S. Bathe, B. Batiounia, T. Bernier, K. B. Bhalla, V. S. Bhatia, C. Blume, D. Bock, R. Bock, E.-M. Bohne, D. Bucher, A. Buijs, E.-J. Buis, H. Büsching, L. Carlen, V. Chalyshev, S. Chattopadhyay, K. E. Chenawi, R. Cherbatchev, T. Chujo, A. Claussen, A. C. Das, M. P. Decowski, V. Djordjadze, P. Donni, I. Doubovik, M. R. Dutta Majumdar, S. Eliseev, K. Enosawa, H. Feldmann, P. Foka, S. Fokin, V. Frolov, M. S. Ganti, S. Garpman, O. Gavrishchuk, F. J. M. Geurts, T. K. Ghosh, R. Glasow, B. Guskov, H. A. Gustafsson, H. H. Gutbrod, R. Higuchi, I. Hrivnacova, M. Ippolitov, H. Kalechofsky, R. Kamermans, K.-H. Kampert, K. Karadjev, K. Karpio, S. Kato, S. Kees, H. Kim, B. W. Kolb, I. Kosarev, I. Koutcheryaev, A. Kugler, P. Kulinich, V. Kumar, K. Kurita, N. Kuzmin, I. Langbein, A. Lebedev, Y. Y. Lee, H. Löhner, D. P. Mahapatra, V. Manko, M. Martin, A. Maximov, R. Mehdiyev, G. Mgebrichvili, Y. Miake, D. Mikhalev, G. C. Mishra, Y. Miyamoto, D. Morrison, D. S. Mukhopadhyay, V. Myalkovski, H. Naef, B. K. Nandi, S. K. Nayak, T. K. Nayak, S. Neumaier, A. Nianine, V. Nikitine, S. Nikolaev, S. Nishimura, P. Nomokonov, J. Nystrand, F. E. Obenshain, A. Oskarsson, I. Otterlund, M. Pachr, A. Parfenov, S. Pavliouk, T. Peitzmann, V. Petracek, F. Plasil, M. L. Purschke, B. Raeven, J. Rak, S. Raniwala, V. S. Ramamurthy, N. K. Rao, F. Retiere, K. Reygers, G. Roland, L. Rosselet, I. Roufanov, J. M. Rubio, H. Sako, S. S. Sambyal, R. Santo, S. Sato, H. Schlagheck, H.-R. Schmidt, G. Shabratova, I. Sibiriak, T. Siemiarczuk, B. C. Sinha, N. Slavine, K. Söderström, N. Solomey, S. P. Sørensen, P. Stankus, G. Stefanek, P. Steinberg, E. Stenlund, D. Stüken, M. Sumbera, T. Svensson, M. D. Trivedi, A. Tsvetkov, C. Twenhöfel, L. Tykarski, J. Urbahn, N. v. Eijndhoven, W. H. v. Heeringen, G. J. v. Nieuwenhuizen, A. Vinogradov, Y. P. Viyogi, A. Vodopianov, S. Vörös, M. A. Vos, B. Wyslouch, K. Yagi, Y. Yokota, G. R. Young, and Research unit Nuclear & Hadron Physics

Subjects
Physics, Azimuth, Nuclear physics, Transverse plane, Azimuthal asymmetry, Physics and Astronomy (miscellaneous), Spectrometer, Proton, NUCLEAR COLLISIONS, Atomic physics, HEAVY-ION COLLISIONS, Nuclear Experiment, Spectral line
Abstract

The first evidence of directed flow at 158 A GeV Pb + Pb collisions is observed using the Plastic Ball detector in WA98 experiment. The azimuthal angle of the total transverse energy, Phi(o), is determined for each event using the observed protons in the Plastic Ball. A clear azimuthal asymmetry of fragments is observed with respect to Phi(o). The degree of azimuthal asymmetry is found to be largest in mid-central collisions, which is consistent with the picture of the collective flow.The p(t) spectra of particles measured in the mid-rapidity spectrometer has been studied in conjunction with the Plastic Ball, and different p(t) slopes with respect to Phi(o) for proton and pi(+) are observed.

Published
1997

19. Photon and η production in p+Pb and p+C collisions at

Author

Petr Nomokonov, A. A. Tsvetkov, S. Nikolaev, Rashmi Raniwala, Hans Rudolf Schmidt, D. Silvermyr, Bolek Wyslouch, Madan M. Aggarwal, C. Baumann, S. Bathe, N. K. Rao, Hans-Åke Gustafsson, Michal Sumbera, B. W. Kolb, Teodor Siemiarczuk, S. Pavliouk, Subhasis Chattopadhyay, F. Plasil, Shunji Nishimura, H. Büsching, M. L. Purschke, A. A. Vinogradov, D. S. Mukhopadhyay, Tomas Svensson, M. Rammler, G. C. Mishra, L. Tykarski, P. W. Stankus, K. El Chenawi, K. B. Bhalla, Mikhail Ippolitov, M. J. Mora, B. K. Nandi, Herbert Löhner, C. Blume, V. Nikitine, Klaus Johannes Reygers, B. Batiounia, Zubayer Ahammed, L. Luquin, O. P. Gavrishchuk, Pål Nilsson, M. Kurata, C. Roy, Sanjeev Singh Sambyal, P. Steinberg, Bedangadas Mohanty, D. P. Mahapatra, R. Glasow, I. Hrivnacova, A.L. Lebedev, S. K. Badyal, G. R. Young, I. Sibiriak, H. H. Gutbrod, Anders Oskarsson, Sudhir Raniwala, L. Rosselet, P. Kulinich, Nikolai V Slavine, J. M. Rubio, P. Donni, K. Söderström, F. Retiere, Krzysztof Karpio, G.S. Shabratova, H. Delagrange, A.L.S. Angelis, H. Kalechofsky, D. Y.-U. Peressounko, Jan Rak, S. C. Phatak, Bikash Sinha, H. Naef, K. Enosawa, V. Petracek, Gunther Roland, A. Maximov, A. Nianine, N. v. Eijndhoven, B.N. Gus'kov, Vladislav Manko, Evert Stenlund, A. K. Dubey, T. K. Ghosh, V. S. Bhatia, I. Roufanov, Joakim Nystrand, D. Bucher, G. Sood, R. Santo, S. Vörös, G. Stefanek, Yasuo Miake, Y. Schutz, T. K. Nayak, S. P. Sorensen, M. S. Ganti, A.S. Vodopianov, T. Peitzmann, Ingvar Otterlund, V. Avdeitchikov, M. P. Decowski, D. P. Morrison, W. Pinganaud, Y. P. Viyogi, G. Martínez, T. H. Shah, V. Arefiev, T. C. Awes, T. Mukhanova, Gerrit Jan van Nieuwenhuizen, T. Bernier, I. Koutcheryaev, P.V.K.S. Baba, H. Schlagheck, Susumu Sato, I. Kosarev, M. Martin, Vladimir Frolov, Lars Carlén, F. J M Geurts, A. Kugler, R. Kamermans, V.G. Antonenko, M. R. Dutta Majumdar, E. C. v. d. Pijll, V. Astakhov, S. K. Nayak, S. Garpman, K. Karadjev, and Sergey Fokin

Subjects
Nuclear reaction, Physics, Nuclear and High Energy Physics, Photon, Meson, 010308 nuclear & particles physics, Eta meson, Hadron, Elementary particle, 01 natural sciences, Nuclear physics, Massless particle, Particle decay, 0103 physical sciences, High Energy Physics::Experiment, 010306 general physics, Nuclear Experiment
Abstract

Measurements of direct photon production in p + Pb and p + C collisions at root(NN)-N-s = 17.4 GeV are presented. Upper limits on the direct photon yield as a function of p(T) are derived and compared to the results for Pb + Pb collisions at root(NN)-N-s = 17.3 GeV. The production of the eta meson, which is an important input to the direct photon signal extraction, has been determined in the eta -> 2 gamma channel for p + C collisions at root(NN)-N-s = 17.4 GeV. (c) 2012 Elsevier B.V. All rights reserved.

Published
2013

20. Limits on the Production of Direct Photons in 200AGeVS32+AuCollisions

Author

R. Albrecht, V. Antonenko, T. C. Awes, C. Barlag, F. Berger, M. Bloomer, C. Blume, D. Bock, R. Bock, E.-M. Bohne, D. Bucher, G. Claesson, A. Claussen, G. Clewing, R. Debbe, L. Dragon, Yu. Dubovik, A. Eklund, S. Fokin, A. Franz, S. Garpman, R. Glasow, H. Å. Gustafsson, H. H. Gutbrod, O. Hansen, G. Hölker, J. Idh, M. Ippolitov, P. Jacobs, K. H. Kampert, K. Karadjev, B. W. Kolb, A. Lebedev, H. Löhner, I. Lund, V. Manko, B. Moskowitz, S. Nikolaev, J. Nystrand, F. E. Obenshain, A. Oskarsson, I. Otterlund, T. Peitzmann, F. Plasil, A. M. Poskanzer, M. Purschke, H.-G. Ritter, B. Roters, S. Saini, R. Santo, H. Schlagheck, H. R. Schmidt, K. Söderström, S. P. Sørensen, P. W. Stankus, K. Steffens, P. Steinhaeuser, E. Stenlund, D. Stüken, A. Vinogradov, H. Wegner, and G. R. Young

Subjects
Systematic error, Physics, Nuclear physics, Particle physics, Photon, General Physics and Astronomy, Sigma, High Energy Physics::Experiment, Statistical error, Nuclear Experiment, Photon yield
Abstract

A search for the production of direct photons in S + An collisions at 200A GeV has been carried out in the CERN-WA80 experiment. For central collisions the measured photon excess at each pr, averaged over the range 0.5 less than or equal to p(T) less than or equal to less than or equal to 2.5 GeV/c, corresponded to 5.0% of the total inclusive photon yield with a statistical error of sigma(stat) = 0.8% and a systematic error of sigma(syst) = 5.8%. Upper limits on the invariant yield for direct photon production at the 90% C.L. are presented. Possible implications for the dynamics of high-energy heavy-ion collisions are discussed.

Published
1996

21. Comparison of π0 and η spectra from S + Au collisions at 200

Author

F. Plasil, D. Stüken, Sergey Nikolaev, R. Glasow, Hr Schmidt, G Holker, Ma Bloomer, H. E. Wegner, L. Dragon, K. Steffens, B. Roters, E. Stenlund, O. Hansen, Herbert Löhner, R. R. Debbe, S. P. Sorensen, K. Söderström, G. R. Young, B. W. Kolb, R. K. Bock, R. Santo, G. Claesson, R. Albrecht, T. Peitzmann, P. Steinhaeuser, A. Lebedev, Agneta Oskarsson, F. E. Obenshain, A. A. Vinogradov, Mikhail Ippolitov, [No Value] Manko, [No Value] Antonenko, S. Saini, Martin Purschke, F. Berger, J. Idh, G. Clewing, T. C. Awes, B. Moskowitz, Kh Kampert, D. Bock, [No Value] Otterlund, [No Value] Lund, Am Poskanzer, Y Doubovik, K. Karadjev, Sergey Fokin, H.H. Gutbrod, S. Garpman, H. A. Gustafsson, Peter Martin Jacobs, and A. Eklund

Subjects
Nuclear physics, Physics, Nuclear and High Energy Physics, Range (particle radiation), Large Hadron Collider, Transverse momentum, Pi, High Energy Physics::Experiment, Invariant mass, Nuclear Experiment, Nucleon, Spectral line
Abstract

Neutral pi0 and eta spectra have been obtained over a wide transverse momentum range for various centralities of S + Au collisions at 200 GeV/nucleon. The analysis was done of the full statistics of the WA80 experiment at CERN using the two-photon invariant mass spectra. Compared to the previous analysis [1, 2] the pi0 and eta spectra were obntained over an extended p(t) range of 0.2

Published
1994

22. Photon and neutral meson data from the collision of 200 A · GeV sulphur ions with gold targets

Author

R. Albrecht, Vladislav Manko, T. Peitzmann, Mikhail Ippolitov, D. Stüken, K. Steffens, I. Lundf, Kh Kampert, J. Idh, A. A. Vinogradov, T. C. Awes, Hr Schmidt, H. Wegener, O. Hansen, S. P. Sorensen, I. Otterlund, Agneta Oskarsson, R. Glasow, G. R. Young, A. Franz, A.L. Lebedev, G. Claesson, S. Saini, S. Garpman, R. R. Debbe, G Holker, L. Dragon, A. M. Poskanzer, B. Moskowitz, H. A. Gustafsson, B. W. Kolb, H. G. Ritter, F. Berger, Herbert Löhner, E. Stenlund, Peter Martin Jacobs, D. Bock, P. Steinhaeuser, G. Clewing, Ma Bloomer, R. L. Ferguson, M. Purschke, B. Roters, K. Karadjev, Sergey Fokin, H.H. Gutbrod, A. Eklund, Felix E. Obenshain, R. K. Bock, F. Plasil, R. Santo, and P. Beckmann

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Photon, Spectrometer, Meson, Collision, Spectral line, Ion, Nuclear physics, Lead glass, visual_art, visual_art.visual_art_medium, Invariant mass, Nuclear Experiment
Abstract

Using a 3790 module lead glass photon spectrometer π° and η mesons have been measured in 200 A · GeV S + Au collisions by invariant mass reconstruction. Centrality selected transverse momentum π° spectra have been obtained for 0.5 ≤ pT ≤ 4.0 GeV/c displaying a much flatter slope for central compared to peripheral data. The problems of extracting single photon to π° yields from the data are discussed and the total error of their determination is given for present and future experiments. It is concluded that an accuracy of about 7 % can be obtained in the γπ° ratio.

Published
1993

23. Intermittency in 200 GeV/nucleon S+S collisions

Author

P. Steinhauser, S. Garpman, S. P. Sorensen, H. A. Gustafsson, P. Jacobs, A. Twyhues, R. Bock, H. G. Ritter, T. C. Awes, S. Fokin, B. W. Kolb, A. Franz, R. Santo, R. L. Ferguson, B. Moskowitz, M Ippolitov, [No Value] Otterlund, D. Stüken, K. Karadjev, Am Poskanzer, L. Dragon, R. Albrecht, F. Plasil, K. Steffens, G. Clewing, F. Berger, B. Roters, J. Idh, O. Hansen, Herbert Löhner, Hr Schmidt, Alexander Vinogradov, S. Saini, G. R. Young, R. Glasow, G. Claesson, M. Hartig, Kh Kampert, P. Beckmann, [No Value] Lund, D. Bock, Evert Anders Stenlund, A. Eklund, Ma Bloomer, H.H. Gutbrod, M. Purschke, R. Debbe, A.L. Lebedev, G Holker, T. Peitzmann, K. Söderström, [No Value] Manko, F. E. Obenshain, and Anders Nils Erik Oskarsson

Subjects
Nuclear reaction, Physics, Nuclear and High Energy Physics, Particle physics, Large Hadron Collider, Physics::Instrumentation and Detectors, Hadron, Elementary particle, law.invention, Nuclear physics, law, Intermittency, Phase space, High Energy Physics::Experiment, Nuclear Experiment, Nucleon, Event generator
Abstract

We have studied one and two-dimensional intermittency in S+S collisions at 200 GeV/nucleon in a high statistics electronic measurement at the CERN SPS using pad-readout streamer tubes. We observe no intermittency signal beyond that produced by folding the Fritiof event generator with a detailed model of our detector. Even though the observed signal contains significant distortions due to experimental effects, we show that we are sensitive to intermittency in the collision.

Published
1992

24. Suppression of High-pTNeutral Pion Production in CentralPb+PbCollisions atsNN=17.3 GeVRelative top+Candp+PbCollisions

Author

K. Söderström, S. Pavliouk, C. Roy, H. Kalechofsky, H. Naef, A. Nianine, S. Bathe, V. S. Bhatia, K. Karadjev, Michal Sumbera, Y. P. Viyogi, P. Steinberg, Teodor Siemiarczuk, Joakim Nystrand, Sergey Fokin, S. P. Sorensen, T. H. Shah, T. Peitzmann, K. B. Bhalla, German Martinez, Peter M. Nilsson, M. R. Dutta Majumdar, V. Astakhov, M. J. Mora, L. Tykarski, A.S. Vodopianov, T. Mukhanova, Shunji Nishimura, A.L.S. Angelis, Frank Jm Geurts, A. Kugler, M. Rammler, MV Manzano Martin, Petr Nomokonov, B.N. Gus'kov, Sukalyan Chattopadhyay, R. Kamermans, Bedangadas Mohanty, R. Glasow, T. Bernier, V. Arefiev, J. Rak, T. C. Awes, Anand Kumar Dubey, K. Enosawa, Rashmi Raniwala, Christoph Blume, E. Stenlund, M. S. Ganti, Ivana Hrivnacova, D. P. Morrison, F. Retiere, H. Delagrange, G.S. Shabratova, H.H. Gutbrod, Gerrit Jan van Nieuwenhuizen, Basanta Kumar Nandi, S. Garpman, P. W. Stankus, Vladislav Manko, Sanjeev Singh Sambyal, O. P. Gavrishchuk, Herbert Löhner, H. A. Gustafsson, D. P. Mahapatra, P. Donni, D. Bucher, G. Stefanek, Yasuo Miake, A. Lebedev, G. R. Young, Hr Schmidt, Krzysztof Karpio, D. Y.-U. Peressounko, Zubayer Ahammed, L. Rosselet, S. K. Badyal, Agneta Oskarsson, G. Sood, Bikash Sinha, D. Mukhopadhyay, N. K. Rao, G. C. Mishra, R. Santo, Gunther Roland, L. Luquin, Klaus Johannes Reygers, T. K. Nayak, A. Maximov, Sudhir Raniwala, Mikhail Ippolitov, Sergey Nikolaev, J. M. Rubio, F. Plasil, I. Sibiriak, H. Büsching, M. Kurata, W. Pinganaud, V. Nikitine, T. Svensson, S. K. Nayak, B. W. Kolb, S. C. Phatak, I. Roufanov, S. Vörös, A. A. Vinogradov, B. Batiounia, P. Kulinich, Nikolai V Slavine, A. A. Tsvetkov, Bolek Wyslouch, E. C. v. d. Pijll, Martin Purschke, Madan M. Aggarwal, Susumu Sato, K. El Chenawi, N. v. Eijndhoven, V. Avdeitchikov, M. P. Decowski, I. Koutcheryaev, P.V.K.S. Baba, C. Baumann, I. Otterlund, Yves Roland Schutz, V.G. Antonenko, H. Schlagheck, I. Kosarev, T. K. Ghosh, D. Silvermyr, Vladimir Frolov, V. Petráček, and Lars Carlén

Subjects
Physics, Particle physics, Pion, 010308 nuclear & particles physics, Astrophysics::High Energy Astrophysical Phenomena, 0103 physical sciences, Transverse momentum, General Physics and Astronomy, Production (computer science), Nuclear Experiment, 010306 general physics, 01 natural sciences
Abstract

Neutral pion transverse momentum spectra were measured in $p+\mathrm{C}$ and $p+\mathrm{Pb}$ collisions at $\sqrt{{s}_{NN}}=17.4\text{ }\text{ }\mathrm{GeV}$ at midrapidity ($2.3\ensuremath{\lesssim}{\ensuremath{\eta}}_{\mathrm{lab}}\ensuremath{\lesssim}3.0$) over the range $0.7\ensuremath{\lesssim}{p}_{T}\ensuremath{\lesssim}3.5\text{ }\text{ }\mathrm{GeV}/c$. The spectra are compared to ${\ensuremath{\pi}}^{0}$ spectra measured in $\mathrm{Pb}+\mathrm{Pb}$ collisions at $\sqrt{{s}_{NN}}=17.3\text{ }\text{ }\mathrm{GeV}$ in the same experiment. For a wide range of $\mathrm{Pb}+\mathrm{Pb}$ centralities (${N}_{\mathrm{part}}\ensuremath{\lesssim}300$), the yield of ${\ensuremath{\pi}}^{0}$'s with ${p}_{T}\ensuremath{\gtrsim}2\text{ }\text{ }\mathrm{GeV}/c$ is larger than or consistent with the $p+\mathrm{C}$ or $p+\mathrm{Pb}$ yields scaled with the number of nucleon-nucleon collisions (${N}_{\mathrm{coll}}$), while for central $\mathrm{Pb}+\mathrm{Pb}$ collisions with ${N}_{\mathrm{part}}\ensuremath{\gtrsim}350$, the ${\ensuremath{\pi}}^{0}$ yield is suppressed.

Published
2008

25. Suppression of high-p{T} neutral pion production in central Pb+Pb collisions at sqrt[S{NN}]=17.3 GeV relative to p+C and p+Pb collisions

Author

M M, Aggarwal, Z, Ahammed, A L S, Angelis, V, Antonenko, V, Arefiev, V, Astakhov, V, Avdeitchikov, T C, Awes, P V K S, Baba, S K, Badyal, S, Bathe, B, Batiounia, C, Baumann, T, Bernier, K B, Bhalla, V S, Bhatia, C, Blume, D, Bucher, H, Büsching, L, Carlén, S, Chattopadhyay, M P, Decowski, H, Delagrange, P, Donni, M R Dutta, Majumdar, K, El Chenawi, A K, Dubey, K, Enosawa, S, Fokin, V, Frolov, M S, Ganti, S, Garpman, O, Gavrishchuk, F J M, Geurts, T K, Ghosh, R, Glasow, B, Guskov, H A, Gustafsson, H H, Gutbrod, I, Hrivnacova, M, Ippolitov, H, Kalechofsky, R, Kamermans, K, Karadjev, K, Karpio, B W, Kolb, I, Kosarev, I, Koutcheryaev, A, Kugler, P, Kulinich, M, Kurata, A, Lebedev, H, Löhner, L, Luquin, D P, Mahapatra, V, Manko, M, Martin, G, Martínez, A, Maximov, Y, Miake, G C, Mishra, B, Mohanty, M-J, Mora, D, Morrison, T, Mukhanova, D S, Mukhopadhyay, H, Naef, B K, Nandi, S K, Nayak, T K, Nayak, A, Nianine, V, Nikitine, S, Nikolaev, P, Nilsson, S, Nishimura, P, Nomokonov, J, Nystrand, A, Oskarsson, I, Otterlund, S, Pavliouk, T, Peitzmann, D, Peressounko, V, Petracek, S C, Phatak, W, Pinganaud, F, Plasil, M L, Purschke, J, Rak, M, Rammler, R, Raniwala, S, Raniwala, N K, Rao, F, Retiere, K, Reygers, G, Roland, L, Rosselet, I, Roufanov, C, Roy, J M, Rubio, S S, Sambyal, R, Santo, S, Sato, H, Schlagheck, H-R, Schmidt, Y, Schutz, G, Shabratova, T H, Shah, I, Sibiriak, T, Siemiarczuk, D, Silvermyr, B C, Sinha, N, Slavine, K, Söderström, G, Sood, S P, Sørensen, P, Stankus, G, Stefanek, P, Steinberg, E, Stenlund, M, Sumbera, T, Svensson, A, Tsvetkov, L, Tykarski, E C, V D Pijll, N, V Eijndhoven, G J, V Nieuwenhuizen, A, Vinogradov, Y P, Viyogi, A, Vodopianov, S, Vörös, B, Wysłouch, and G R, Young

Abstract

Neutral pion transverse momentum spectra were measured in p+C and p+Pb collisions at sqrt[S{NN}]=17.4 GeV at midrapidity (2.3 less than or approximately equal eta{lab} less than or approximately equal 3.0) over the range 0.7 less than or approximately equal p{T} less than or approximately equal 3.5 GeV/c. The spectra are compared to pi{0} spectra measured in Pb+Pb collisions at sqrt[S{NN}]=17.3 GeV in the same experiment. For a wide range of Pb+Pb centralities (N{part} less than or approximately equal 300), the yield of pi{0}'s with p{T} greater than or approximately equal 2 GeV/c is larger than or consistent with the p+C or p+Pb yields scaled with the number of nucleon-nucleon collisions (N{coll}), while for central Pb+Pb collisions with N{part}greater than or approximately equal 350, the pi{0} yield is suppressed.

Published
2007

26. Centrality and Transverse Momentum Dependence of Collective Flow in 158 A GeV Pb+Pb Collisions Measured via Inclusive Photons

Author

I. Otterlund, P. Kulinich, Nikolai V Slavine, E. C. v. d. Pijll, K. Enosawa, MV Manzano Martin, C. Roy, I. Koutcheryaev, P.V.K.S. Baba, Krzysztof Karpio, D. Y.-U. Peressounko, N. v. Eijndhoven, Gerrit Jan van Nieuwenhuizen, Y. P. Viyogi, Jan Rak, A. A. Tsvetkov, Bolek Wyslouch, H. Kalechofsky, Shunji Nishimura, G. Sood, T. K. Ghosh, V. Avdeitchikov, David Olle Rickard Silvermyr, R. Santo, T. Peitzmann, H. Naef, A. Nianine, G. Stefanek, A.L.S. Angelis, T. H. Shah, T. K. Nayak, T. C. Awes, V. S. Bhatia, Teodor Siemiarczuk, M. P. Decowski, Madan M. Aggarwal, P. W. Stankus, Herbert Löhner, Zubayer Ahammed, D. P. Mahapatra, A. Maximov, F. Plasil, T. Mukhanova, A. A. Vinogradov, Sergey Nikolaev, L. Rosselet, H. Büsching, B. W. Kolb, Mikhail Ippolitov, C. Blume, S. K. Badyal, H. Delagrange, Susumu Sato, K. El Chenawi, B. Batiounia, M. Kurata, M. J. Mora, O. P. Gavrishchuk, Bikash Sinha, G. R. Young, I. Hrivnacova, D. S. Mukhopadhyay, Gunther Roland, M. R. Dutta Majumdar, K. Söderström, F. Retiere, V. Astakhov, S. P. Sorensen, B. K. Nandi, V. Arefiev, Joakim Nystrand, Peter M. Nilsson, S. C. Phatak, G. C. Mishra, I. Roufanov, Yasuo Miake, S. Vörös, A. K. Dubey, Sanjeev Singh Sambyal, S. K. Nayak, Sudhir Raniwala, R. Kamermans, J. M. Rubio, Petr Nomokonov, Rashmi Raniwala, F. J M Geurts, V.G. Antonenko, N. K. Rao, Hans Rudolf Schmidt, T. Bernier, H. Schlagheck, S. Garpman, H. A. Gustafsson, Vladimir Frolov, Lars Carlén, L. Luquin, K. Karadjev, Sergey Fokin, E. Stenlund, A.S. Vodopianov, Y. Schutz, P. Donni, H. H. Gutbrod, D. P. Morrison, W. Pinganaud, V. Nikitine, T. Svensson, G.S. Shabratova, V. Petracek, D. Bucher, Vladislav Manko, B.N. Gus'kov, S. Bathe, A. Kugler, Michal Sumbera, Sukalyan Chattopadhyay, M. S. Ganti, L. Tykarski, G. Martínez, M. L. Purschke, Bedangadas Mohanty, R. Glasow, A.L. Lebedev, P. Steinberg, I. Sibiriak, I. Kosarev, Agneta Oskarsson, Klaus Johannes Reygers, Laboratoire SUBATECH Nantes (SUBATECH), Mines Nantes (Mines Nantes)-Université de Nantes (UN)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), WA98, Research unit Nuclear & Hadron Physics, and KVI - Center for Advanced Radiation Technology

Subjects
Nuclear reaction, Nuclear and High Energy Physics, Particle physics, Photon, FOS: Physical sciences, HEAVY-ION COLLISIONS, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Particle identification, PB-208+PB-208 COLLISIONS, Physics::Fluid Dynamics, Nuclear physics, Pion, deduced neutral pion flow features, nuclear reactions Pb-208(Pb-208, X), E=158 GeV/nucleon, 0103 physical sciences, Nuclear Physics - Experiment, Rapidity, OF-PLANE EMISSION, Nuclear Experiment (nucl-ex), 010306 general physics, Nuclear Experiment, X), Physics, measured inclusive photons direct and elliptic flow vs. centrality, measured: inclusive photons direct and elliptic flow vs. centrality: rapidity and transverse momentum, Large Hadron Collider, Spectrometer, 010308 nuclear & particles physics, ELLIPTIC FLOW, Elliptic flow, E=158 GeV/nucleon, 158-CENTER-DOT-A GEV, WA98 EXPERIMENT, Nuclear reactions: 208Pb(208Pb, RELATIVISTIC NUCLEAR COLLISIONS, AZIMUTHAL ANISOTROPY, deduced: neutral pion flow features, nuclear reactions Pb-208(Pb-208, High Energy Physics::Experiment, rapidity and transverse momentum, PARTICLE IDENTIFICATION, X): E=158 GeV/nucleon, AU+AU COLLISIONS
Abstract

Directed and elliptic flow of inclusive photons near mid-rapidity in $158 $A GeV Pb+Pb collisions has been studied. The data have been obtained with the photon spectrometer LEDA of the WA98 experiment at the CERN SPS. The flow strength has been measured for various centralities as a function of $p_T$ and rapidity over $0.18 < p_T < 1.5 \mathrm{GeV}/c$ and $2.3 < y < 2.9$. The angular anisotropy has been studied relative to an event plane obtained in the target fragmentation region that shows the elliptic flow to be in-plane. The elliptic flow has also been studied using two-particle correlations and shown to give similar results. A small directed flow component is observed. Both the directed and elliptic flow strengths increase with $p_T$. The photon flow results are used to estimate the corresponding neutral pion flow., 28 pages, 10 figures

Published
2005

27. Interferometry of Direct Photons in CentralPb208+Pb208Collisions at158A GeV

Author

Krzysztof Karpio, K. Söderström, Jan Rak, Pål Nilsson, P. Kulinich, G. R. Young, Hans Rudolf Schmidt, Bedangadas Mohanty, R. Glasow, Nikolai V Slavine, Teodor Siemiarczuk, A.L. Lebedev, Evert Stenlund, Joakim Nystrand, Shunji Nishimura, A. K. Dubey, T. Bernier, V. Nikitine, T. Peitzmann, T. Svensson, H. Schlagheck, T. H. Shah, H. Kalechofsky, I. Roufanov, Madan M. Aggarwal, S. Garpman, H. Naef, Susumu Sato, A. Nianine, A.L.S. Angelis, S. K. Nayak, A.S. Vodopianov, V. S. Bhatia, Zubayer Ahammed, Vladimir Frolov, B. W. Kolb, Klaus Johannes Reygers, Y. P. Viyogi, G. C. Mishra, M. R. Dutta Majumdar, Lars Carlén, Sanjeev Singh Sambyal, S. K. Badyal, D. P. Mahapatra, B. Guskov, K. El Chenawi, V. Astakhov, C. Roy, Bikash Sinha, F. Retiere, T. V. Moukhanova, Y. Schutz, I. Hrivnacova, A. A. Vinogradov, S. Vörös, N. v. Eijndhoven, S. P. Sorensen, I. Koutcheryaev, F. J M Geurts, P.V.K.S. Baba, V. Arefiev, Anders Oskarsson, H. H. Gutbrod, V.G. Antonenko, I. Sibiriak, Gerrit Jan van Nieuwenhuizen, B. Batiounia, D. Peressounko, V. Avdeitchikov, Ingvar Otterlund, M. Kurata, Yasuo Miake, C. Blume, P. Donni, A. A. Tsvetkov, D. Silvermyr, Bolek Wyslouch, Sukalyan Chattopadhyay, M. S. Ganti, Hans-Åke Gustafsson, O. P. Gavrishchuk, G. Stefanek, L. Luquin, E. C. v. d. Pijll, T. C. Awes, S. C. Phatak, M. P. Decowski, D. P. Morrison, W. Pinganaud, A. Maximov, K. Karadjev, Sergey Nikolaev, Sergey Fokin, K. B. Bhalla, M. J. Mora, Mikhail Ippolitov, K. Enosawa, T. K. Ghosh, Petr Nomokonov, Rashmi Raniwala, P. W. Stankus, Herbert Löhner, N. K. Rao, L. Rosselet, V. Petracek, H. Delagrange, Vladislav Manko, S. Bathe, Michal Sumbera, L. Tykarski, Sudhir Raniwala, J. M. Rubio, D. S. Mukhopadhyay, G. Martínez, Gunther Roland, F. Plasil, H. Büsching, G. Sood, B. K. Nandi, R. Santo, A. Kugler, M. L. Purschke, T. K. Nayak, MV Manzano Martin, P. Steinberg, I. Kosarev, G.S. Shabratova, and D. Bucher

Subjects
Physics, Particle physics, Photon, 010308 nuclear & particles physics, General Physics and Astronomy, Plasma, Invariant (physics), 01 natural sciences, Photon yield, Central region, Nuclear physics, Interferometry, 0103 physical sciences, Nuclear Experiment, 010306 general physics
Abstract

Two-particle correlations of direct photons were measured in central 208Pb+208Pb collisions at 158A GeV. The invariant interferometric radii were extracted for 100

Published
2004

28. Centrality dependence of charged-neutral particle fluctuations in158AGeV208Pb+208Pbcollisions

Author

F. J M Geurts, V.G. Antonenko, Krzysztof Karpio, C. Roy, I. G. Sibiriak, H. Schlagheck, T. Bernier, Jan Rak, F. Plasil, H. Büsching, S. P. Sorensen, I. Otterlund, MV Manzano Martin, T. H. Shah, V. Arefiev, Peter M. Nilsson, K. Söderström, G. Sood, S. Garpman, B. K. Nandi, T. Mukhanova, A. A. Vinogradov, H. Kalechofsky, R. Santo, H. A. Gustafsson, V. Frolov, H. H. Gutbrod, Shunji Nishimura, Sanjeev Singh Sambyal, K. Enosawa, H. Naef, Yasuo Miake, Teodor Siemiarczuk, A. Nianine, Sukalyan Chattopadhyay, A. K. Dubey, B. Batiounia, Joakim Nystrand, T. K. Ghosh, M. P. Decowski, M. S. Ganti, L. Rosselet, D. P. Morrison, W. Pinganaud, V. S. Bhatia, A. Kugler, K. Reygers, David Olle Rickard Silvermyr, Petr Nomokonov, I. Koutcheryaev, P.V.K.S. Baba, Rashmi Raniwala, I. Roufanov, T. K. Nayak, P. Kulinich, D. P. Mahapatra, Agneta Oskarsson, N. v. Eijndhoven, Nikolai V Slavine, A. Maximov, Zubayer Ahammed, E. C. v. d. Pijll, G. R. Young, L. Luquin, A.L.S. Angelis, D. S. Mukhopadhyay, N. K. Rao, M. L. Purschke, S. K. Badyal, Gunther Roland, K. B. Bhalla, M. J. Mora, B. Guskov, Bikash Sinha, H. Delagrange, A.S. Vodopianov, T. Peitzmann, Sudhir Raniwala, M. R. Dutta Majumdar, I. Hrivnacova, J. M. Rubio, V. Avdeitchikov, K. Karadjev, S. Vörös, Susumu Sato, V. Astakhov, Sergey Fokin, P. Steinberg, F. Retiere, Sergey Nikolaev, I. Kosarev, C. Blume, P. W. Stankus, P. Donni, A. A. Tsvetkov, Herbert Löhner, O. P. Gavrishchuk, Bolek Wyslouch, Madan M. Aggarwal, H. R. Schmidt, M. Kurata, S. K. Nayak, G. Martínez, B. W. Kolb, K. El Chenawi, G. C. Mishra, G.S. Shabratova, D. Bucher, V. Nikitine, T. Svensson, Gerrit Jan van Nieuwenhuizen, E. Stenlund, D. Peressounko, Y. Schutz, Y. P. Viyogi, Lars Carlén, G. Stefanek, T. C. Awes, Mikhail Ippolitov, Bedangadas Mohanty, R. Glasow, A.L. Lebedev, S. Bathe, Michal Sumbera, L. Tykarski, V. Petracek, and Vladislav Manko

Subjects
Quantum chromodynamics, Physics, Nuclear and High Energy Physics, Photon, 010308 nuclear & particles physics, Multiplicity (mathematics), 01 natural sciences, Molecular physics, Charged particle, Nuclear physics, Phase space, 0103 physical sciences, 010306 general physics, Neutral particle
Abstract

Results on the study of localized fluctuations in the multiplicity of charged particles and photons produced in 158A GeV/c Pb+Pb collisions are presented for varying centralities. The charged versus neutral particle multiplicity correlations in common phase space regions of varying azimuthal sizes are analyzed by two different methods. Various types of mixed events are constructed to probe fluctuations arising from different sources. The measured results are compared to those from simulations and from mixed events. The comparison indicates the presence of nonstatistical fluctuations in both the charged particle and photon multiplicities in limited azimuthal regions. However, no correlated charged-neutral fluctuations, a possible signature of formation of disoriented chiral condensates, are observed. An upper limit on the production of disoriented chiral condensates is set.

Published
2003

29. One-, two-, and three-particle distributions from158AGeV/ccentral Pb+Pb collisions

Author

M. L. Purschke, P. Steinberg, I. Sibiriak, V. Petracek, I. Kosarev, Shunji Nishimura, Vladislav Manko, S. K. Nayak, E. Stenlund, K. Söderström, T. H. Shah, Yasuo Miake, G. Sood, Sukalyan Chattopadhyay, M. S. Ganti, A.L.S. Angelis, G. Stefanek, T. Mukhanova, K. Enosawa, A. A. Vinogradov, T. C. Awes, T. K. Ghosh, L. Rosselet, E. C. v. d. Pijll, K. Karadjev, Sergey Fokin, M. P. Decowski, G. Martínez, D. P. Mahapatra, B. Batiounia, R. Santo, Hans Rudolf Schmidt, A.S. Vodopianov, Joakim Nystrand, Gerrit Jan van Nieuwenhuizen, Agneta Oskarsson, D. Peressounko, S. Bathe, H. A. Gustafsson, A. Maximov, G.S. Shabratova, K. B. Bhalla, M. R. Dutta Majumdar, V. Astakhov, P. Kulinich, M. J. Mora, S. P. Sorensen, Michal Sumbera, V. Arefiev, A. Kugler, Klaus Johannes Reygers, G. R. Young, Peter M. Nilsson, P. Donni, H. H. Gutbrod, Nikolai V Slavine, Sergey Nikolaev, C. Blume, Krzysztof Karpio, H. Kalechofsky, H. Naef, V. Frolov, T. Bernier, Jan Rak, L. Tykarski, P. W. Stankus, A. Nianine, O. P. Gavrishchuk, S. Garpman, T. K. Nayak, Herbert Löhner, V. S. Bhatia, S. K. Badyal, D. Bucher, D. P. Morrison, I. Roufanov, D. S. Mukhopadhyay, Gunther Roland, MV Manzano Martin, B. Guskov, Bikash Sinha, F. J M Geurts, V.G. Antonenko, Bedangadas Mohanty, G. C. Mishra, R. Kamermans, H. Schlagheck, S. Vörös, R. Glasow, Teodor Siemiarczuk, David Olle Rickard Silvermyr, I. Hrivnacova, M. Kurata, Y. Schutz, A.L. Lebedev, Lars Carlén, Mikhail Ippolitov, V. Nikitine, Y. P. Viyogi, T. Svensson, H. Delagrange, Sudhir Raniwala, J. M. Rubio, Petr Nomokonov, Rashmi Raniwala, N. K. Rao, F. Plasil, H. Büsching, B. K. Nandi, Madan M. Aggarwal, B. W. Kolb, K. El Chenawi, N. v. Eijndhoven, V. Avdeitchikov, Susumu Sato, Sanjeev Singh Sambyal, A. A. Tsvetkov, Bolek Wyslouch, T. Peitzmann, I. Otterlund, I. Koutcheryaev, and P.V.K.S. Baba

Subjects
Nuclear reaction, Physics, Nuclear and High Energy Physics, Particle physics, Meson, 010308 nuclear & particles physics, Nuclear Theory, Hadron, Elementary particle, Nuclear matter, 01 natural sciences, Nuclear physics, Pion, Phase space, 0103 physical sciences, Nuclear Experiment, 010306 general physics, Boson
Abstract

Several hadronic observables have been studied in central 158A GeV Pb+Pb collisions using data measured by the WA98 experiment at CERN: single pi(-) and K- production, as well as two- and three-pion interferometry. The Wiedemann-Heinz hydrodynamical model has been fitted to the pion spectrum, giving an estimate of the temperature and transverse flow velocity. Bose-Einstein correlations between two identified pi(-) have been analyzed as a function of k(T), using two different parametrizations. The results indicate that the source does not have a strictly boost invariant expansion or spend time in a long-lived intermediate phase. A comparison between data and a hydrodynamical based simulation shows very good agreement for the radii parameters as a function of k(T). The pion phase-space density at freeze-out has been measured, and agrees well with the Tomasik-Heinz model. A large pion chemical potential close to the condensation limit of m(pi) seems to be excluded. The three-pion Bose-Einstein interferometry shows a substantial contribution of the genuine three-pion correlation, but not quite as large as expected for a fully chaotic and symmetric source.

Published
2003

30. PHENIX detector overview

Author

C. H. Kuberg, N. N. Ajitanand, J.D. Lopez, J. Chiba, L. Kotchenda, B. D. Fox, S. Bhaganatula, P. Pitukhin, Shunji Nishimura, J. Behrendt, R. A. Soltz, D.E. Hurst, F. Heistermann, G.W. Thornton, Takahiro Nakamura, G. C. Mishra, Ryo Yamamoto, Takao Sakaguchi, J.B. Archuleta, M. Grosse Perdekamp, A. L. Godoi, C. Blume, G.W. Hart, C. Klein-Boesing, A. Durum, Stephen Daniels, X. Liu, J. D. Tepe, V. Bumazhnov, A. D. Frawley, G. Riabov, A. Usachev, Wuzheng Meng, C. L. Woody, J. LaBounty, M. Issah, H. Funahashi, D. S. Brown, J. Mead, A. Lebedev, L. Hawkins, G.A. Sleege, A. Shajii, P.S. Willis, A. Khomutnikov, J.S. Hicks, D. Engo, A. Ster, R. Cunningham, S. Chollet, A. G. Hansen, S. H. Aronson, E. Taniguchi, W.D. Thomas, E. Vznuzdaev, S. F. Pate, H. Tsuruoka, R.B. Chappell, K. N. Barish, Felix E. Obenshain, V. Baublis, T. Honaguchi, I. V. Sourikova, H. Torii, V.D. Lebedev, T. Shiina, David Olle Rickard Silvermyr, S. Batsouli, E. P. Hartouni, Gerry Bunce, W. Lenz, T. L. Thomas, W. Holzmann, R. Ruggiero, H.D. Skank, Charles Maguire, Y. Sumi, M. Ono, Y. J. Kwon, W. Liccardi, Ryugo S. Hayano, B. V. Dinesh, J. Chang, Y. Riabov, J. Bowers, S. S. Adler, G. S. Kyle, K. Enosawa, S. Hahn, H.-J. Kehayias, Kenta Shigaki, V. Papavassiliou, B. Libby, Sébastien Gadrat, A. S. Nyanin, E. Stenlund, E. Bosze, Y. Miyamoto, Y. I. Makdisi, W. C. Chang, F. Messer, Yasushi Nagasaka, J. Banning, D.J. Clark, N. Miftakhov, D. E. Fields, T. Ushiroda, B. V. Jacak, G. T. Danby, M.S. Musrock, T. K. Hemmick, Sean A. Kelly, M. Sugioka, Wei Xie, A. Deshpande, Hiroaki Ohnishi, Y. Yokota, James Alexander, O. Tarasenkova, Jason Newby, J.P. Jones, Wei Tian, R. du Rietz, L. Sanfratello, T.F. Gee, Y. Wan, S. Sakai, S.H. Robinson, V. Vasiliev, J. G. Boissevain, N. Kamihara, V.I. Vishnevskii, An.A. Vorobyov, F. G. Bellaiche, M. Velkovsky, Josh Moss, V. Lebedev, M. Tamai, S. Butsyk, Vladimir Samsonov, K. Katou, C.M. Dabrowski, S. T. Belyaev, P. J. Kroon, Y. Liu, M. J. Tannenbaum, V.S. Kozlov, A. K. Purwar, T. A. Carey, J.R. Archuleta, M. Sekimoto, L. Zhang, V. S. Pantuev, G. Gogiberidze, J.P. Freidberg, E. Kistenev, Nu Xu, A. P.T. Palounek, Vladislav Manko, M. Messer, Athanasios Petridis, A. Kiyomichi, D.W. Crook, M. Murray, Senta Greene, Alexei Khanzadeev, V. V. Ikonnikov, M. Chiu, Ajit Kumar Mohanty, A. Kozlov, C. Velissaris, G. R. Young, R. Averbeck, A. A. Vinogradov, V.V. Kuriatkov, R. Raynis, K. Adcox, J. Tradeski, E.M. Stein, S. Sawada, F. Matathias, Junji Tojo, P. Steinberg, R. Armendariz, B. Azmoun, M.S. Emery, J.L. Thomas, S. S. Kapoor, Junwei Wu, Byung-Sik Hong, A. Bazilevsky, L.W. Wright, R. Seto, Zhedong Zhang, Keith W. Jones, Henrik Tydesjö, C. P. Singh, Mark Allen, Mikhail Ippolitov, M. Pollack, N. Bruner, T. A. Shibata, V.A. Onuchin, W.L. Bryan, S. Garpman, Graham H. Turner, Steven E. Skutnik, Tetsufumi Hirano, Franck Gastaldi, B. Khachaturov, O. Fackler, J.W. Walker, Alexander Milov, M. D. Marx, M. Stepanov, G. Roche, G. Jackson, V. Ivanov, A. Kandasamy, E. O'Brien, C. Pancake, D. Bucher, J. Barrette, Hyun-Chul Kim, J. M. Qualls, J. Milan, M. Rosati, G.P. Solodov, M. Bobrek, T. Matsumoto, X. He, L.Donald Isenhower, H. En'yo, W. W. Kinnison, Michael L. Simpson, P. Constantin, S. Boose, M. C. McCain, Jiangyong Jia, Y. Goto, M. J. Leitch, J. L. Nagle, M. S. Chung, P. Giannotti, R. Rao, C. Witzig, S. Klinksiek, H. Cunitz, Y. Kamyshkov, R. Hoade, R. Lacey, S. Yoneyama, O. Drapier, M. Vznuzdaev, J. H. Kang, T. C. Awes, R. Belkin, X.B. Martinez, S. Belikov, K. S. Joo, R. Machnowski, S. Migluolio, J. S. Haggerty, A. Romana, J. S. Kapustinsky, Hideki Hamagaki, L. Nikkinen, Akira Masaike, D. P. Morrison, Jun Kikuchi, Philippe Rosnet, Joakim Nystrand, N. Starinsky, H. Hara, Y. Tanaka, A. Drees, D.-W. Kim, T. K. Shea, J. Negrin, W. Von Achen, M. Suzuki-Nara, G. David, V. E. Semenov, A. Moore, R. E. Mischke, J. Johnson, C. Zhang, L. L. Chavez, C.T. Hunter, Tai Sakuma, G.T. Alley, M.L. Brooks, T. Chujo, L. Wood, V.S. Griffin, Anders Nils Erik Oskarsson, Riko Higuchi, M. Kann, T. Christ, J. Harder, A. A. Rose, J. Ferrierra, J. DeMoss, D.G. Markushin, B. K. Nandi, Christopher B. Williams, K. Minuzzo, Y. Nakada, John D. Jackson, W. Guryn, M. A. Volkov, R. Conway, R. Thern, E. J. Desmond, Viktor Riabov, R.A. Todd, V. Tarakanov, Z. Sun, F. Toldo, P. L. McGaughey, Yongsun Kim, P. W. Stankus, J. Gosset, S. Esumi, J. P. Sullivan, R. Granier de Cassagnac, N. Ericson, B. R. Schlei, W. A. Zajc, Yuri Efremenko, M. Hibino, M. Kennedy, L.G. Kudin, R. Gentry, J. M. Burward-Hoy, W. Verhoeven, M. Libkind, S. Lin, Z. Li, Dong Jo Kim, T. Shimada, R.H. Hance, A. Denisov, S. Y. Kim, O. Dietzsch, D. M. Lee, V. Cianciolo, Andy W. Brown, K. Karadjev, S.A. Kahn, M. Cutshaw, C. A. Ogilvie, Sergey Fokin, G.G. Moscone, H. Buesching, Dipanwita Dutta, V. Armijo, Iou.A. Koutcheryaev, V. Shangin, A. Hoover, I. Tserruya, V.V. Kashikhin, F. Barta, A.B. Barker, R. Amirikas, Julia Velkovska, L. Villatte, I. E. Yushmanov, V. Shelikhov, T. C. Sangster, L. Paffrath, R. Savino, V. Singh, E. Fujisawa, M.A. Echave, G. B. Kim, J. Gannon, D. Koehler, H. Hayashi, K. Ebisu, Yasuo Miake, M. Lenz, Melissa C. Smith, Xingguo Li, Hirohiko Sato, K. El Chenawi, S. K. Tuli, E. Roschin, D. J. Lim, W. Stokes, Zhongfan Liu, R. Jayakumar, J. Lauret, Aya Sakaguchi, German Martinez, M. Gonin, George Davey Smith, Y. H. Shin, Shih-Chang Lee, Martin Purschke, Y. Kuroki, W. Y. Jang, Minghui Liu, K. S. Sim, R. Begay, Alexander Vasiliev, Sebastian N. White, K. Kurita, M. Sivertz, T. Weimer, Kenneth Francis Read, D. Kotchetkov, T. Plagge, Z. Fraenkel, H.-Å. Gustafsson, A.W. Bland, J. Stewering, S. Bathe, D. Borland, Hiroyuki Sako, K. Imai, F. Kajihara, S. P. Stoll, H. Delagrange, V.A. Evseev, M. Kopytine, K. Yagi, S. Zhou, D.C. Smith, B. Komkov, B.R. Whitus, J. L. Drachenberg, Markus Merschmeyer, C. Britton, Y. Severgin, Norio Saito, S. Wang, T. E. Miller, R. Santo, R. Hutter, A. Enokizono, Kensuke Homma, P. Chung, E. Melnikov, K. Pope, T. Ferdousi, W.F. Sandhoff, R. K. Choudhury, A. Debraine, M.A. Kelley, Yoshio Arai, S.S. Frank, T. Ichihara, S. P. Sorensen, S. C. Johnson, Y. J. Mao, W. Sippach, D. Jouan, S. Chernichenko, M. J. Kweon, K. Koseki, Peter M. Nilsson, A. Franz, J. T. Mitchell, F. K. Wohn, B. Bassalleck, F. Mühlbacher, T. K. Ghosh, L. Ewell, T. Moore, J. G. Lajoie, T. Hachiya, S. A. Nikolaev, M. R. Shaw, K.C. Cook, U. Jagadish, M. Rau, Atsushi Taketani, H. W. Van Hecke, I. D. Ojha, Motoi Inaba, L. Britton, H. Kobayashi, S. Salomone, M. Vassent, S. K. Mark, S. Rankowitz, David D'Enterria, Y. Berdnikov, J. E. Frantz, R. Petersen, J. Simon-Gillo, R. P. Pisani, D. Jaffe, Y. Akiba, P. D. Barnes, Laurent Bernard Aphecetche, Herve Borel, Lennart Osterman, Nikolay Tyurin, S. Nagamiya, Kazuhiro Tanaka, A. Glenn, S. Urasawa, Klaus Johannes Reygers, R. Schleuter, B.C. Montoya, G. Rao, S. Steffens, S. Y. Fung, V. Kochetkov, J.R. Mahon, P. Kravtsov, Nathan Longbotham, Y. Cobigo, Jack Fried, M. Kurata-Nishimura, I. Sibiriak, I. Ravinovich, P. Chand, F. Plasil, L.C. Watkins, Ryan M. Roth, J. Halliwell, S. S. Ryu, D. Autrey, M. Van Lith, Y. Melnikov, Ahmed Al-Jamel, T. Kohama, Masayasu Ishihara, John Hill, K. Oyama, L. Kluberg, B.G. Wong-Swanson, Susumu Sato, A.L. Wintenberg, M. Muniruzzaman, P. O'Conner, F. Staley, S. Markacs, Toru Sugitate, V. Trofimov, S. Kametani, Y. Yang, B. M. Johnson, H. Akikawa, Y. Watanabe, R. Prigl, M.M. Cafferty, François Fleuret, M. Aizama, Brian Cole, R. S. Towell, J. H. Thomas, L. Davis Isenhower, S. Marino, J.C. Biggs, M. J. Bennett, K. Wolniewicz, N. Hayashi, A. Soldatov, D. S. Ho, J. Fellenstein, N. Heine, C. Y. Chi, W.E. Sondheim, E. Lockner, A. A. Tsvetkov, T. Peitzmann, Saskia Mioduszewski, H. Wang, Yves Roland Schutz, C. Pinkenburg, J. Murata, S. Botelho, Shiv K. Gupta, J.-S. Chai, J. M. Heuser, Sumio Kato, E. M. Takagui, I. Shein, I. Otterlund, A.R. Harvey, Alberto Baldisseri, A. Danmura, S. Yokkaichi, S. Held, Laboratoire SUBATECH Nantes (SUBATECH), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université de Nantes (UN)-Mines Nantes (Mines Nantes), Laboratoire Leprince-Ringuet (LLR), Centre National de la Recherche Scientifique (CNRS)-École polytechnique (X)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Laboratoire de Physique Corpusculaire - Clermont-Ferrand (LPC), Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut de Physique Nucléaire d'Orsay (IPNO), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Harrison M. Ludlam T. Ozaki S., PHENIX, Mines Nantes (Mines Nantes)-Université de Nantes (UN)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-École polytechnique (X)-Centre National de la Recherche Scientifique (CNRS), and Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Photon, Muon, Spectrometer, Physics::Instrumentation and Detectors, 010308 nuclear & particles physics, Detector, Electron, Nuclear matter, 7. Clean energy, 01 natural sciences, Nuclear physics, 0103 physical sciences, High Energy Physics::Experiment, PHENIX detector, Nuclear Experiment, 010306 general physics, Nucleon, Instrumentation
Abstract

The PHENIX detector is designed to perform a broad study of A-A, p-A, and p-p collisions to investigate nuclear matter under extreme conditions. A wide variety of probes, sensitive to all timescales, are used to study systematic variations with species and energy as well as to measure the spin structure of the nucleon. Designing for the needs of the heavy-ion and polarized-proton programs has produced a detector with unparalleled capabilities. PHENIX measures electron and muon pairs, photons, and hadrons with excellent energy and momentum resolution. The detector consists of a large number of subsystems that are discussed in other papers in this volume. The overall design parameters of the detector are presented. (C) 2002 Elsevier Science B.V. All rights reserved.

Published
2003

31. Event-by-event fluctuations in particle multiplicities and transverse energy produced in158A GeVPb+Pb collisions

Author

C. Blume, Petr Nomokonov, O. P. Gavrishchuk, S. Nikolaev, Rashmi Raniwala, A.S. Vodopianov, I. Sibiriak, G. Sood, H. Kalechofsky, Teodor Siemiarczuk, K. Karadjev, Madan M. Aggarwal, R. Santo, H. Naef, A. Nianine, F. J M Geurts, Sergey Fokin, B.N. Gus'kov, C. Roy, G. Martínez, V.G. Antonenko, T. K. Nayak, N. K. Rao, B. W. Kolb, K. El Chenawi, L. Rosselet, V. S. Bhatia, H. Schlagheck, I. Kosarev, A.L.S. Angelis, Agneta Oskarsson, M. L. Purschke, Krzysztof Karpio, S. Garpman, T. H. Shah, P. Steinberg, N. v. Eijndhoven, D. Y.-U. Peressounko, Jan Rak, H. A. Gustafsson, Vladimir Frolov, Yasuo Miake, Shunji Nishimura, Klaus Johannes Reygers, G.S. Shabratova, Lars Carlén, David Olle Rickard Silvermyr, V. Avdeitchikov, Susumu Sato, M. P. Decowski, I. Hrivnacova, Hans Rudolf Schmidt, A. A. Vinogradov, P. Donni, T. Mukhanova, G. C. Mishra, T. Peitzmann, Sukalyan Chattopadhyay, Sudhir Raniwala, B. Batiounia, M. S. Ganti, D. Bucher, Sanjeev Singh Sambyal, J. M. Rubio, H. Delagrange, K. Enosawa, T. Bernier, K. Söderström, P. Kulinich, M. Kurata, Nikolai V Slavine, T. K. Ghosh, F. Plasil, E. C. v. d. Pijll, Gunther Roland, H. Büsching, L. Luquin, D. P. Mahapatra, I. Otterlund, MV Manzano Martin, I. Koutcheryaev, P.V.K.S. Baba, B. K. Nandi, Joakim Nystrand, D. P. Morrison, W. Pinganaud, G. R. Young, A. A. Tsvetkov, K. B. Bhalla, Bolek Wyslouch, M. J. Mora, P. W. Stankus, Herbert Löhner, A. K. Dubey, F. Retiere, A. Maximov, G. Stefanek, Zubayer Ahammed, S. K. Badyal, Bikash Sinha, S. P. Sorensen, Peter M. Nilsson, A. Kugler, Y. P. Viyogi, S. K. Nayak, Mikhail Ippolitov, M. R. Dutta Majumdar, V. Arefiev, V. Astakhov, T. C. Awes, Gerrit Jan van Nieuwenhuizen, I. Roufanov, S. Vörös, S. Bathe, Michal Sumbera, S. C. Phatak, D. S. Mukhopadhyay, L. Tykarski, Bedangadas Mohanty, R. Glasow, A.L. Lebedev, V. Petracek, Vladislav Manko, V. Nikitine, T. Svensson, H. H. Gutbrod, E. Stenlund, and Y. Schutz

Subjects
Quantum chromodynamics, Nuclear physics, Physics, Nuclear and High Energy Physics, Phase transition, Transverse plane, Particle physics, Photon, Quark–gluon plasma, Multiplicity (mathematics), Charged particle, Event generator
Abstract

Event-by-event fluctuations in the multiplicities of charged particles and photons, and the total transverse energy in 158A GeV Pb+Pb collisions are studied for a wide range of centralities. For narrow centrality bins the multiplicity and transverse energy distributions are found to be near perfect Gaussians. The effect of detector acceptance on the multiplicity fluctuations has been studied and demonstrated to follow statistical considerations. The centrality dependence of the charged particle multiplicity fluctuations in the measured data has been found to agree reasonably well with those obtained from a participant model. However, for photons the multiplicity fluctuations have been found to be lower compared to those obtained from a participant model. The multiplicity and transverse energy fluctuations have also been compared to those obtained from the VENUS event generator.

Published
2002

32. Localized charged-neutral fluctuations in 158A GeVPb plus Pb collisions

Author

P. Kulinich, Nikolai V Slavine, V. S. Ramamurthy, Mikhail Ippolitov, Madan M. Aggarwal, I. Hrivnacova, R. Cherbatchev, Zubayer Ahammed, C. Blume, S. Garpman, M. Kurata, S. K. Badyal, A.S. Vodopianov, I. G. Sibiriak, S. Neumaier, B. Guskov, K. Söderström, Bikash Sinha, O. P. Gavrishchuk, G. Stefanek, M. Pachr, T. Bernier, B. W. Kolb, K. B. Bhalla, T. Peitzmann, M. J. Mora, G.S. Shabratova, S. P. Sorensen, R. Kamermans, E. C. v. d. Pijll, Joakim Nystrand, T. C. Awes, V. Arefiev, Agneta Oskarsson, Shunji Nishimura, K. El Chenawi, Peter M. Nilsson, M. D. Trivedi, H. Schlagheck, A. A. Vinogradov, Y. Miyamoto, S. Pavliouk, D. P. Morrison, W. Pinganaud, Gerrit Jan van Nieuwenhuizen, M. L. Purschke, Shiv K. Gupta, I. Koutcheryaev, C. Klein-Bösing, E. Stenlund, Klaus Johannes Reygers, Tatsuya Chujo, A.L.S. Angelis, F. E. Obenshain, Teodor Siemiarczuk, P.V.K.S. Baba, V. Petracek, D. Bucher, I. Roufanov, M. R. Dutta Majumdar, V. Astakhov, V. Djordjadze, B. Batiounia, M. P. Decowski, S. Bathe, Sukalyan Chattopadhyay, D. P. Mahapatra, I. Doubovik, A. C. Das, T. H. Shah, K. Karadjev, P. Donni, M. S. Ganti, Sergey Fokin, S. Vörös, A. Maximov, Vladislav Manko, Lars Carlén, D. Stüken, Y. Yokota, I. Langbein, H. R. Schmidt, U. v. Poblotzki, Sanjeev Singh Sambyal, A. A. Tsvetkov, A. Claussen, Bolek Wyslouch, Kh Kampert, Sergey Nikolaev, S. Eliseev, R. Bock, A. Buijs, Krzysztof Karpio, F. J M Geurts, Y.Y. Lee, Y. P. Viyogi, V. Nikitine, P. Foka, S. K. Nayak, S. Dutt, Jan Rak, V.G. Antonenko, H. H. Gutbrod, K. Enosawa, T. Svensson, I. Otterlund, Yasuo Miake, S. Kato, H. Delagrange, A. K. Dubey, T. K. Ghosh, K. Kurita, N. v. Eijndhoven, G. C. Mishra, R. Higuchi, C. Barlag, V. Chalyshev, J. Urbahn, Y. Schutz, Z.K. Böröcz, Susumu Sato, S. Kees, V. Avdeitchikov, E.-M. Bohne, L. Luquin, S. Knoche, F. Retiere, Bedangadas Mohanty, R. Glasow, P. Steinberg, A.L. Lebedev, G. R. Young, K. Yagi, N.A. Kuzmin, H. A. Gustafsson, Hiroyuki Sako, I. Kosarev, Michal Sumbera, L. Tykarski, G. Martínez, T. Krümpel, A. Agnihotri, A. Kugler, N. Solomey, G. Sood, R. Santo, T. K. Nayak, L. Rosselet, MV Manzano Martin, H. Kalechofsky, Md. F. Mir, H. Naef, A. Nianine, V. S. Bhatia, D. S. Mukhopadhyay, Gunther Roland, Petr Nomokonov, Rashmi Raniwala, C. Roy, P. W. Stankus, Herbert Löhner, N. K. Rao, David Olle Rickard Silvermyr, F. Plasil, H. Büsching, B. K. Nandi, G. Mgebrichvili, Sudhir Raniwala, J. M. Rubio, and Research unit Nuclear & Hadron Physics

Subjects
Quantum chromodynamics, Physics, Nuclear and High Energy Physics, Photon, DOMAINS, FOS: Physical sciences, Multiplicity (mathematics), Elementary particle, HADRONIC-INTERACTIONS, QCD, Charged particle, WA98 EXPERIMENT, Massless particle, Nuclear physics, Phase space, SEARCH, DISORIENTED CHIRAL CONDENSATE, Nuclear Experiment (nucl-ex), Nuclear Experiment, HIGH-ENERGY COLLISIONS, PB+PB COLLISIONS, DETECTOR, Nuclear Physics, Boson
Abstract

First results on the measurement of localized fluctuations in the multiplicity of charged particles and photons produced in central 158 A GeV Pb+Pb collisions are presented. The charged versus neutral correlations in common phase space regions of varying azimuthal size are analyzed by two different methods. The measured results are compared to those from simulations and to those from different types of mixed events. The comparison indicates the presence of non-statistical fluctuations in both charged particle and photon multiplicities in limited azimuthal regions. However, no correlated charge-neutral fluctuations are observed., Comment: 5 pages, 3 postscript figures

Published
2001

33. Multiplicity Distributions and Charged-neutral Fluctuations

Author

V. Frolov, I. Koutcheryaev, Christoph Blume, Shunji Nishimura, T. C. Awes, O. Gavrishchuk, Yasuo Miake, G. J V Nieusvenhuizen, Bikash Sinha, B. Wyslouch, G. Stefanek, P. V K S Baba, G. R. Young, I. Hrivnacova, Bedangadas Mohanty, Mikhail Ippolitov, Rashmi Raniwala, H. Kim, C. Twenhöfel, R. Glasow, Madan M. Aggarwal, V. S. Ramamurthy, D. P. Mahapatra, S. Eliseev, I. Kosarev, Herbert Löhner, A. Vodopianov, A. Buijs, A.L.S. Angelis, E. J. Buis, B. Raeven, R. K. Bock, Nikolai V Slavine, S. Neumaier, L. Carlen, Klaus Johannes Reygers, A. Kugler, G. Shabratova, S. K. Badyal, Evert Stenlund, Y.Y. Lee, T. Peitzmann, Susumu Sato, P. Steinberg, T. Siemiarczuk, I. Doubovik, F. J M Geurts, Marcel Vos, N. V. Eijndhoven, H. Schlagheck, Y. P. Viyogi, D. S. Mukhopadhyay, A. Agnihotri, S. Bathe, D. Morrison, K. Karadjev, V. Djordjadze, K. Söderström, T. K. Ghosh, J. Nystrand, M. Sumbera, S. S. Sambyal, V. Astakhov, B. K. Nandi, W. H V Heeringen, N. Solomey, S. P. Sørensen, Sukalyan Chattopadhyay, H. Feldmann, M. S. Ganti, E.-M. Bohne, M. R. Dutta Majumdar, K. Karpio, Sudhir Raniwala, L. Tykarski, J. M. Rubio, R. Higuchi, S. Garpman, N. K. Rao, F. E. Obenshain, S. Kees, L. Barabach, V. Avdeitchikov, K. E. Chenawi, M. Pachr, A. Lebedev, H. Büsching, V. Chalyshev, Y. Miyamoto, Kh Kampert, K. Kurita, T. K. Nayak, J. Urbahn, MV Manzano Martin, A. C. Das, Martin Purschke, Shiv K. Gupta, S. Pavliouk, A. Maximov, A. Baldine, Vladislav Manko, H. H. Gutbrod, S. K. Nayak, C. Barlag, V. Petracek, P. Kulinich, G. Mgebrichvili, D. Mikhalev, A. A. Vinogradov, I. Sibiriak, L. Rosselet, Y. Yokota, A. Tsvetkov, A. Parfenov, N. Kuzmin, G. Roland, V. Arefiev, V.G. Antonenko, S. Fokin, S. Vörös, A. Claussen, P. Stankus, R. Mehdiyev, J. Rak, H. A. Gustafsson, Zubayer Ahammed, Tatsuya Chujo, V. Kumar, M. Kurata, F. Retiere, D. Bucher, M. D. Trivedi, B. W. Kolb, P. Foka, T. Bernier, Hr Schmidt, K. Yagi, P. Donni, I. Otterlund, V. Nikitine, A. Oskarsson, H. Kalechofsky, M. P. Decowski, H. Naef, A. Nianine, R. Kamermans, A. K. Dubey, T. Svensson, D. Stüken, R. Cherbatchev, V. S. Bhatia, I. Langbein, Sergey Nikolaev, V. Myalkovski, B. Guskov, F. Plasil, B. Batiounia, I. Roufanov, P. Nomokov, G. Sood, R. Santo, K. Enosawa, S. Kato, G. C. Mishra, K. B. Bhalla, and KVI - Center for Advanced Radiation Technology

Subjects
Nuclear reaction, Particle physics, Phase transition, Photon, quark-gluon plasma, fluctuations, General Physics and Astronomy, FOS: Physical sciences, Elementary particle, HEAVY-ION COLLISIONS, Nuclear physics, SEARCH, Nuclear Physics - Experiment, Nuclear Experiment (nucl-ex), FIELD, Nuclear Experiment, Scaling, DETECTOR, Nuclear Physics, Boson, DISORIENTED-CHIRAL-CONDENSATE, DCC, Quantum chromodynamics, Physics, Multiplicity (mathematics), QCD, Charged particle, SIGNAL, Massless particle, Quark–gluon plasma, disoriented chiral condensates, PHASE-TRANSITION, Particle, High Energy Physics::Experiment, Nucleon
Abstract

Results from the multiplicity distributions of inclusive photons and charged particles, scaling of particle multiplicities, event-by-event multiplicity fluctuations, and charged-neutral fluctuations in 158$\cdot A$ GeV Pb+Pb collisions are presented and discussed. A scaling of charged particle multiplicity as $N_{part}^{1.07\pm 0.05}$ and photons as $N_{part}^{1.12\pm 0.03}$ have been observed, indicating violation of naive wounded nucleon model. The analysis of localized charged-neutral fluctuation indicates a model-independent demonstration of non-statistical fluctuations in both charged particles and photons in limited azimuthal regions. However, no correlated charged-neutral fluctuations are observed., Talk given at the International Symposium on Nuclear Physics (ISNP-2000), Mumbai, India, 18-22 Dec 2000, Proceedings to be published in Pramana, Journal of Physics

Published
2001

34. Three-pion interferometry results from central Pb+Pb collisions at 158A GeV/c

Author

M M, Aggarwal, A, Agnihotri, Z, Ahammed, A L, Angelis, V, Antonenko, V, Arefiev, V, Astakhov, V, Avdeitchikov, T C, Awes, P V, Baba, S K, Badyal, C, Barlag, S, Bathe, B, Batiounia, T, Bernier, K B, Bhalla, V S, Bhatia, C, Blume, R, Bock, E M, Bohne, Z, Böröcz, D, Bucher, A, Buijs, H, Büsching, L, Carlen, V, Chalyshev, S, Chattopadhyay, R, Cherbatchev, T, Chujo, A, Claussen, A C, Das, M P, Decowski, H, Delagrange, V, Djordjadze, P, Donni, I, Doubovik, S, Dutt, M R, Dutta Majumdar, K, El Chenawi, S, Eliseev, K, Enosawa, P, Foka, S, Fokin, M S, Ganti, S, Garpman, O, Gavrishchuk, F J, Geurts, T K, Ghosh, R, Glasow, S K, Gupta, B, Guskov, H A, Gustafsson, H H, Gutbrod, R, Higuchi, I, Hrivnacova, M, Ippolitov, H, Kalechofsky, R, Kamermans, K H, Kampert, K, Karadjev, K, Karpio, S, Kato, S, Kees, C, Klein-Bösing, S, Knoche, B W, Kolb, I, Kosarev, I, Koutcheryaev, T, Krümpel, A, Kugler, P, Kulinich, M, Kurata, K, Kurita, N, Kuzmin, I, Langbein, A, Lebedev, Y Y, Lee, H, Löhner, L, Luquin, D P, Mahapatra, V, Manko, M, Martin, G, Martínez, A, Maximov, G, Mgebrichvili, Y, Miake, M F, Mir, G C, Mishra, Y, Miyamoto, B, Mohanty, M J, Mora, D, Morrison, D S, Mukhopadhyay, H, Naef, B K, Nandi, S K, Nayak, T K, Nayak, S, Neumaier, A, Nianine, V, Nikitine, S, Nikolaev, P, Nilsson, S, Nishimura, P, Nomokonov, J, Nystrand, F E, Obenshain, A, Oskarsson, I, Otterlund, M, Pachr, S, Pavliouk, T, Peitzmann, V, Petracek, W, Pinganaud, F, Plasil, U, von Poblotzki, M L, Purschke, J, Rak, R, Raniwala, S, Raniwala, V S, Ramamurthy, N K, Rao, F, Retiere, K, Reygers, G, Roland, L, Rosselet, I, Roufanov, C, Roy, J M, Rubio, H, Sako, S S, Sambyal, R, Santo, S, Sato, H, Schlagheck, H R, Schmidt, Y, Schutz, G, Shabratova, T H, Shah, I, Sibiriak, T, Siemiarczuk, D, Silvermyr, B C, Sinha, N, Slavine, K, Söderström, N, Solomey, S P, Sørensen, P, Stankus, G, Stefanek, P, Steinberg, E, Stenlund, D, Stüken, M, Sumbera, T, Svensson, M D, Trivedi, A, Tsvetkov, L, Tykarski, J, Urbahn, E C, Pijll, N, Eijndhoven, G J, Nieuwenhuizen, A, Vinogradov, Y P, Viyogi, A, Vodopianov, S, Vörös, B, Wysłouch, K, Yagi, Y, Yokota, and G R, Young

Abstract

Three-particle correlations have been measured for identified pi(-) from central 158A GeV Pb+Pb collisions by the WA98 experiment at CERN. A substantial contribution of the genuine three-body correlation has been found as expected for a mainly chaotic and symmetric source.

Published
2000

35. Search for disoriented chiral condensates in 158.A GeV Pb + Pb collisions

Author

Tapan K. Nayak, M.M. Aggarwal, A. Agnihotri, Z. Ahammed, A.L.S. Angelis, V. Antonenko, V. Arefiev, V. Astakhov, V. Avdeitchikov, T.C. Awes, P.V.K.S. Baba, S.K. Badyal, A. Baldine, L. Barabach, C. Barlag, S. Bathe, B. Batiounia, T. Bernier, K.B. Bhalla, V.S. Bhatia, C. Blume, R. Bock, E.-M. Bohne, D. Bucher, A. Buijs, E.-J. Buis, H. Büsching, L. Carlen, V. Chalyshev, S. Chattopadhyay, K.E. Chenawi, R. Cherbatchev, T. Chujo, A. Claussen, A.C. Das, M.P. Decowski, V. Djordjadze, P. Donni, I. Doubovik, M.R. Dutta Majumdar, S. Eliseev, K. Enosawa, H. Feldmann, P. Foka, S. Fokin, V. Frolov, M.S. Ganti, S. Garpman, O. Gavrishchuk, F.J.M. Geurts, T.K. Ghosh, R. Glasow, S.K. Gupta, B. Guskov, H.A. Gustafsson, H.H. Gutbrod, R. Higuchi, I. Hrivnacova, M. Ippolitov, H. Kalechofsky, R. Kamermans, K.-H. Kampert, K. Karadjev, K. Karpio, S. Kato, S. Kees, H. Kim, B.W. Kolb, I. Kosarev, I. Koutcheryaev, A. Kugler, P. Kulinich, V. Kumar, M. Kurata, K. Kurita, N. Kuzmin, I. Langbein, A. Lebedev, Y.Y. Lee, H. Löhner, D.P. Mahapatra, V. Manko, M. Martin, A. Maximov, R. Mehdiyev, G. Mgebrichvili, Y. Miake, D. Mikhalev, G.C. Mishra, Y. Miyamoto, B. Mohanty, D. Morrison, D.S. Mukhopadhyay, V. Myalkovski, H. Naef, B.K. Nandi, S.K. Nayak, T.K. Nayak, S. Neumaier, A. Nianine, V. Nikitine, S. Nikolaev, S. Nishimura, P. Nomokov, J. Nystrand, F.E. Obenshain, A. Oskarsson, I. Otterlund, M. Pachr, A. Parfenov, S. Pavliouk, T. Peitzmann, V. Petracek, F. Plasil, M.L. Purschke, B. Raeven, J. Rak, S. Raniwala, V.S. Ramamurthy, N.K. Rao, F. Retiere, K. Reygers, G. Roland, L. Rosselet, I. Roufanov, J.M. Rubio, S.S. Sambyal, R. Santo, S. Sato, H. Schlagheck, H.-R. Schmidt, G. Shabratova, I. Sibiriak, T. Siemiarczuk, B.C. Sinha, N. Slavine, K. Söderström, N. Solomey, S.P. Sørensen, P. Stankus, G. Stefanek, P. Steinberg, E. Stenlund, D. Stüken, M. Sumbera, T. Svensson, M.D. Trivedi, A. Tsvetkov, C. Twenhöfel, L. Tykarski, J. Urbahn, N.v. Eijndhoven, W.H.v. Heeringen, G.J.v. Nieuwenhuizen, A. Vinogradov, Y.P. Viyogi, A. Vodopianov, S. Vörös, M.A. Vos, B. Wyslouch, K. Yagi, Y. Yokota, and G.R. Young

Subjects
Physics, Nuclear physics, Nuclear and High Energy Physics, Photon, Phase space, Charged particle, Nuclear Physics
Abstract

The authors have studied the production of hadrons and photons in the reaction Pb(Pb, X) at 158 A.GeV. They have applied the discrete wavelet transform to the photon and charged-particle correlations in order to obtain a set of father function coefficients. They try to explain the multiplicity fluctuations by means of localized disoriented chiral condensate domains. (7 refs). A detailed analysis of the phase space distributions of charged particles and photons have been carried out using two independent methods. The results indicate the presence of nonstatistical fluctuations in localized regions of phase space.

Published
2000

36. Collective flow and HBT in Pb+Pb collisions at the CERN-SPS

Author

Subhasis Chattopadhyay, Agneta Oskarsson, Klaus Johannes Reygers, Ashim Das, A. A. Vinogradov, H. Naef, A. Nianine, R. Mehdiyev, M. Kurata, B. Batiounia, H.H. Gutbrod, Susumu Sato, D. Mikhalev, S. K. Nayak, K. Kurita, Teodor Siemiarczuk, S. Pavliouk, V. S. Bhatia, B. Raeven, Petr Nomokonov, Rashmi Raniwala, G.S. Shabratova, A. A. Tsvetkov, V. Djordjadze, Shunji Nishimura, Zubayer Ahammed, R. Higuchi, Bolek Wyslouch, R. Santo, R. Cherbatchev, A. Buijs, P. Kulinich, Nikolai V Slavine, C. Blume, I. Otterlund, W. Pinanaud, M. R. Dutta Majumdar, L. Luquin, C. Barlag, V. S. Ramamurthy, D. P. Mahapatra, S. K. Badyal, V. Astakhov, Basanta Kumar Nandi, F. Retiere, I. Roufanov, O. P. Gavrishchuk, Y. Yokota, Krzysztof Karpio, Hyun-Chul Kim, V. Chalyshev, MV Manzano Martin, Frank Jm Geurts, Sanjeev Singh Sambyal, Bikash Sinha, H.Å. Gustafeson, I. Koutcheryaev, L. Rosselet, F. E. Obenshain, P.V.K.S. Baba, N. K. Rao, Jan Rak, A.S. Vodopianov, T. K. Nayak, M. D. Trivedi, H. Kalechofeky, S. Vörös, Md. F. Mir, Ivana Hrivnacova, N.A. Kuzmin, J. Urbahn, C. Roy, P. Steinberg, Martin Purschke, B. W. Kolb, A.L.S. Angelis, Kh Kampert, D. Bucher, Z.K. Böröcz, Hiroyuki Sako, E.-M. Bohne, Mikhail Ippolitov, Sudhir Raniwala, Yasuo Miake, S. Garpman, M. P. Decowski, S. Neumaier, J. M. Rubio, P. Donni, A. Kugler, S. P. Sorensen, E. Stenlund, A. Maximov, R. Kamermans, Gunther Roland, Peter M. Nilsson, T. Bernier, D. Stüken, M. Pachr, I. Langbein, G. R. Young, S. Dutt, Madan M. Aggarwal, V. Myalkovski, David Olle Rickard Silvermyr, L. Barabach, K. Karadjev, Sergey Nikolaev, T. H. Shah, A. Lebedev, E. C. v. d. Pijll, Sergey Fokin, S. Eliseev, A. Baldine, D. P. Morrison, P. Foka, Tatsuya Chujo, K. Yagi, A. Claussen, Hr Schmidt, Y.Y. Lee, V. Nikitine, T. Svensson, T. Krümpel, Y. P. Viyogi, K. El Chenawi, N. v. Eijndhoven, G. C. Mishra, S. Kees, V. Avdeitchikov, G. Stefanek, P. W. Stankus, V. Arefiev, Herbert Löhner, T. C. Awes, Gerrit Jan van Nieuwenhuizen, T. Peitzmann, Y. Miyamoto, Shiv K. Gupta, K. Söderström, Joakim Nystrand, A. Parfenov, I. Sibiriak, M. S. Ganti, K. B. Bhalla, S. Bathe, Michal Sumbera, H. Schlagheck, I. Kosarev, T. K. Ghosh, B.N. Gus'kov, A. Agnihotri, N. Solomey, S. Nishimura, Vladimir Frolov, V. Petráček, Lars Carlén, D. S. Mukhopadhyay, L. Tykarski, K. Enosawa, S. Kato, I. Doubovik, Vladislav Manko, V.G. Antonenko, R. Glasow, R. K. Bock, F. Plasil, H. Büsching, G. Mgebrichvili, Laboratoire SUBATECH Nantes (SUBATECH), Mines Nantes (Mines Nantes)-Université de Nantes (UN)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and WA98

Subjects
Physics, Nuclear and High Energy Physics, Large Hadron Collider, Proton, 010308 nuclear & particles physics, Plane (geometry), Astrophysics::High Energy Astrophysical Phenomena, Heterojunction bipolar transistor, 01 natural sciences, 7. Clean energy, Nuclear physics, Interferometry, Flow (mathematics), [PHYS.HPHE]Physics [physics]/High Energy Physics - Phenomenology [hep-ph], 0103 physical sciences, Atomic physics, Nuclear Experiment, 010306 general physics, Astrophysics::Galaxy Astrophysics
Abstract

Study of elliptic emission for identified particles has been performed in 158A GeV Pb+Pb collisions near mid-rapidity region. Our preliminary results indicate the existence of the in-plane elliptic emission for {pi}{sup +} and proton, and out-of-plane elliptic emission for K+ in semi-central collisions. In addition, two-pion interferometry is studied as a function of the pair direction relative to the reaction plane.

Published
1999

37. Multiplicity and pseudorapidity distribution of photons in S+Au reaction at 200A GeV

Author

M. M. Aggarwal, A. L. S. Angelis, V. Antonenko, T. C. Awes, S. K. Badyal, C. Barlag, K. B. Bhalla, V. S. Bhatia, C. Blume, D. Bock, E.-M. Bohne, D. Bucher, A. Buijs, S. Chattopadhyay, A. Claussen, G. Clewing, A. C. Das, P. Devanand, P. Dönni, E. Durieux, M. R. Dutta Majumdar, S. Fokin, M. S. Ganti, S. Garpman, F. Geurts, T. K. Ghosh, R. Glasow, S. K. Gupta, H.-Å. Gustafsson, H. H. Gutbrod, M. Hartig, Xiaochun He, G. Hölker, M. Ippolitov, M. Izycki, S. Kachroo, R. Kamermans, K.-H. Kampert, K. Karadjev, B. W. Kolb, V. Kumar, I. Langbein, J. Langheinrich, A. Lebedev, H. Löhner, V. Manko, M. Martin, I. S. Mittra, H. Naef, S. K. Nayak, T. K. Nayak, S. Nikolaev, J. Nystrand, F. E. Obenshain, A. Oskarsson, I. Otterlund, T. Peitzmann, F. Plasil, M. Purschke, S. Raniwala, N. K. Rao, L. Rosselet, B. Roters, J. M. Rubio, S. Saini, S. Sambyal, R. Santo, H. R. Schmidt, T. Siemiarczuk, R. Siemssen, B. C. Sinha, S. Slegt, K. Söderström, N. Solomey, S. P. Sorensen, G. Stefanek, P. Steinhaeuser, E. Stenlund, A. Ster, D. Stüken, M. D. Trivedi, C. Twenhoefel, N. Van Eijndhoven, W. H. Van Heeringen, A. Vinogradov, Y. P. Viyogi, S. Weber, G. R. Young, and Research unit Nuclear & Hadron Physics

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, COLLISIONS, Large Hadron Collider, Photon, ION EXPERIMENT WA80, PERFORMANCE, Charged particle, REGION, Nuclear physics, ENERGY, Pseudorapidity, CERN, High Energy Physics::Experiment, Multiplicity (chemistry), CALORIMETER, Centrality, Nuclear Experiment, DETECTOR, Event generator, MID-RAPIDITY
Abstract

The photon multiplicity has been measured for the first time in S+Au collisions at 200A GeV over a wide pseudorapidity range (2.8{le}{eta}{le}5.2) employing a fine granularity preshower detector. The pseudorapidity density of photons increases with centrality, reaching {approximately}200 at the highest centrality studied. The results are compared with measurements of the charged particle multiplicity and with predictions of the VENUS event generator. {copyright} {ital 1998} {ital The American Physical Society}

Published
1998

38. Present Status and Future of DCC Analysis

Author

Tapan K. Nayak, M.M. Aggarwal, A. Agnihotri, Z. Ahammed, A.L.S. Angelis, V. Antonenko, V. Arefiev, V. Astakhov, V. Avdeitchikov, T.C. Awes, P.V.K.S. Baba, S.K. Badyal, A. Baldine, L. Barabach, C. Barlag, S. Bathe, B. Batiounia, T. Bernier, K.B. Bhalla, V.S. Bhatia, C. Blume, R. Bock, E.-M. Bohne, D. Bucher, A. Buijs, E.-J. Buis, H. Büsching, L. Carlen, V. Chalyshev, S. Chattopadhyay, K.E. Chenawi, R. Cherbatchev, T. Chujo, A. Claussen, A.C. Das, M.P. Decowski, V. Djordjadze, P. Donni, I. Doubovik, M.R. Dutta Majumdar, S. Eliseev, K. Enosawa, H. Feldmann, P. Foka, S. Fokin, V. Frolov, M.S. Ganti, S. Garpman, O. Gavrishchuk, F.J.M. Geurts, T.K. Ghosh, R. Glasow, S.K. Gupta, B. Guskov, H.A. Gustafsson, H.H. Gutbrod, R. Higuchi, I. Hrivnacova, M. Ippolitov, H. Kalechofsky, R. Kamermans, K.-H. Kampert, K. Karadjev, K. Karpio, S. Kato, S. Kees, H. Kim, B.W. Kolb, I. Kosarev, I. Koutcheryaev, A. Kugler, P. Kulinich, V. Kumar, M. Kurata, K. Kurita, N. Kuzmin, I. Langbein, A. Lebedev, Y.Y. Lee, H. Löhner, D.P. Mahapatra, V. Manko, M. Martin, A. Maximov, R. Mehdiyev, G. Mgebrichvili, Y. Miake, D. Mikhalev, G.C. Mishra, Y. Miyamoto, D. Morrison, D.S. Mukhopadhyay, V. Myalkovski, H. Naef, B.K. Nandi, S.K. Nayak, T.K. Nayak, S. Neumaier, A. Nianine, V. Nikitine, S. Nikolaev, S. Nishimura, P. Nomokov, J. Nystrand, F.E. Obenshain, A. Oskarsson, I. Otterlund, M. Pachr, A. Parfenov, S. Pavliouk, T. Peitzmann, V. Petracek, F. Plasil, M.L. Purschke, B. Raeven, J. Rak, S. Raniwala, V.S. Ramamurthy, N.K. Rao, F. Retiere, K. Reygers, G. Roland, L. Rosselet, I. Roufanov, J.M. Rubio, S.S. Sambyal, R. Santo, S. Sato, H. Schlagheck, H.-R. Schmidt, G. Shabratova, I. Sibiriak, T. Siemiarczuk, B.C. Sinha, N. Slavine, K. Söderström, N. Solomey, S.P. Sørensen, P. Stankus, G. Stefanek, P. Steinberg, E. Stenlund, D. Stüken, M. Sumbera, T. Svensson, M.D. Trivedi, A. Tsvetkov, C. Twenhöfel, L. Tykarski, J. Urbahn, N.v. Eijndhoven, W.H.v. Heeringen, G.J.v. Nieuwenhuizen, A. Vinogradov, Y.P. Viyogi, A. Vodopianov, S. Vörös, M.A. Vos, B. Wyslouch, K. Yagi, Y. Yokota, and G.R. Young

Subjects
Quantum chromodynamics, Physics, Nuclear and High Energy Physics, High energy, Chiral symmetry, Particle physics, High Energy Physics::Lattice, Nuclear Theory, High Energy Physics::Phenomenology, FOS: Physical sciences, Current analysis, High Energy Physics - Experiment, High Energy Physics - Experiment (hep-ex), Pion, Heavy ion, Nuclear Experiment, Analysis method, Particle Physics - Experiment
Abstract

Disoriented Chiral Condensates (DCC) have been predicted to form in high energy heavy ion collisions where the approximate chiral symmetry of QCD has been restored. This leads to large imbalances in the production of charged to neutral pions. Sophisticated analysis methods are being developed to disentangle DCC events out of the large background of events with conventionally produced particles. We present a short review of current analysis methods and future prospects., 12 pages, 5 figures. Invited talk presented at the 13th International Conference on Ultrarelativistic Nucleus-Nucleus Collisions (Quark Matter 97), Tsukuba, Japan, 1-5 Dec 1997

Published
1998

39. Event by event measurement of〈pT〉of photons in S + Au collisions at 200 A·GeV

Author

M.M. Aggarwal, A.L.S. Angelis, V. Antonenko, T.C. Awes, S.K. Badyal, C. Barlag, K.B. Bhalla, V.S. Bhatia, C. Blume, D. Bock, E.-M. Bohne, D. Bucher, A. Buijs, S. Chattopadhyay, A. Claussen, G. Clewing, A.C. Das, null Devanand, P. Dönni, E. Durieux, M.R. Dutta Majumdar, S. Fokin, M.S. Ganti, S. Garpman, F. Geurts, T.K. Ghosh, R. Glasow, S.K. Gupta, H.-Å. Gustafsson, H.H. Gutbrod, M. Hartig, He Xiaochun, G. Hölker, M. Ippolitov, M. Izycki, S. Kachroo, R. Kamermans, K.-H. Kampert, K. Karadjev, B.W. Kolb, I. Langbein, J. Langheinrich, A. Lebedev, H. Löhner, V. Manko, M. Martin, I.S. Mittra, H. Naef, S.K. Nayak, T.K. Nayak, S. Nikolaev, J. Nystrand, F.E. Obenshain, A. Oskarsson, I. Otterlund, T. Peitzmann, F. Plasil, M. Purschke, S. Raniwala, N.K. Rao, L. Rosselet, B. Roters, J.M. Rubio, S. Saini, S. Sambyal, R. Santo, H.R. Schmidt, T. Siemiarczuk, R. Siemssen, B.C. Sinha, S. Slegt, K. Söderström, N. Solomey, S.P. Sorensen, G. Stefanek, P. Steinhaeuser, E. Stenlund, A. Ster, D. Stüken, M.D. Trivedi, C. Twenhoefel, N. Van Eijndhoven, W.H. Van Heeringen, A. Vinogradov, Y.P. Viyogi, S. Weber, G.R. Young, Angelis, Aris, Donni, Paul, Durieux, Eric Marie Geoffroy, Martin, Michel, Naef, Hanspeter, Rosselet, Laurent, Rubio, Juan Miguel, and Solomey, Nickolas

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Photon, Large Hadron Collider, biology, Venus, ddc:500.2, biology.organism_classification, Spectral line, Nuclear physics, Transverse plane, Transverse momentum, Multiplicity (chemistry), Nuclear Experiment, Event generator
Abstract

The mean transverse momentum of photons has been determined on an event by event basis in S + Au collisions at 200 A.GeV from the ratio of the measured electromagnetic transverse energy (E-T(em)) to the photon multiplicity (N-gamma). The average value obtained is similar to that determined for the same system using spectroscopic techniques. The centrality dependence of the measured values are in agreement with the predictions of the VENUS event generator. (C) 1997 Published by Elsevier Science B.V.

Published
1997

40. Soft photon production in central 200 GeV/nucleon $^{32}S$ + Au collisions

Author

M. M. Aggarwal, A. L. S. Angelis, V. Antonenko, T. C. Awes, S. K. Badyal, C. Barlag, K. B. Bhalla, V. S. Bhatia, C. Blume, D. Bock, E.-M. Bohne, D. Bucher, A. Buijs, S. Chattopadhyay, A. Claussen, G. Clewing, A. C. Das, L. Devanand, P. Dönni, E. Durieux, M. R. Dutta Majumdar, P. Foka, S. Fokin, M. S. Ganti, S. Garpman, F. Geurts, T. K. Ghosh, R. Glasow, S. K. Gupta, H.-Å. Gustafsson, H. H. Gutbrod, M. Hartig, He Xiaochun, G. Hölker, M. Ippolitov, M. Izycki, S. Kachroo, H. Kalechofsky, R. Kamermans, K.-H. Kampert, K. Karadjev, B. W. Kolb, V. Kumar, I. Langbein, J. Langheinrich, A. Lebedev, H. Löhner, S. Lokanathan, V. Manko, M. Martin, I. S. Mittra, S. Mookerjee, H. Naef, S. K. Nayak, S. Nikolaev, J. Nystrand, F. E. Obenshain, A. Oskarsson, I. Otterlund, T. Peitzmann, F. Plasil, M. Purschke, S. Raniwala, N. K. Rao, L. Rosselet, B. Roters, J. M. Rubio, S. Saini, S. S. Sambyal, R. Santo, H. R. Schmidt, T. Siemiarczuk, R. Siemssen, B. C. Sinha, S. Slegt, K. Söderström, N. Solomey, S. P. Sorensen, G. Stefanek, P. Steinhaeuser, E. Stenlund, A. Ster, D. Stüken, M. D. Trivedi, C. Twenhoefel, N. van Eijndhoven, E. van Heeringen, A. Vinogradov, Y. P. Viyogi, S. Weber, G. R. Young, Angelis, Aris, Donni, Paul, Durieux, Eric Marie Geoffroy, Foka, Panagiota, Kalechofsky, Hal, Martin, Michel, Naef, Hanspeter, Rosselet, Laurent, Rubio, Juan Miguel, Solomey, Nickolas, and Research unit Nuclear & Hadron Physics

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Soft photon, Photon, Large Hadron Collider, Meson, Nuclear Theory, Hadron, ddc:500.2, Nuclear physics, Transverse plane, High Energy Physics::Experiment, Production (computer science), CALORIMETER, Nuclear Experiment, Nucleon, Particle Physics - Experiment
Abstract

Inclusive photons of low transverse momenta have been measured in 200 GeV/nucleon {sup 32}S+Au collisions at the CERN SPS. Data were taken in the WA93 experiment using a small acceptance BGO detector with longitudinal segmentation. The results are compared to WA80 measurements for the same system and results from hadron decay calculations. An excess of soft photons over the expectations from neutral meson decays is observed. {copyright} {ital 1997} {ital The American Physical Society}

Published
1997

41. Photon and neutral meson production in 158 AGeV 208Pb+Pb collisions

Author

Thomas Peitzmann, M. Aggarwal, A. Agnihotri, A.L.S. Angelis, V. Antonenko, V. Arefiev, V. Astakhov, V. Avdeitchikov, T.C. Awes, S.K. Badyal, A. Baldine, L. Barabach, C. Barlag, S. Bathe, B. Batiounia, T. Bernier, K.B. Bhalla, V.S. Bhatia, C. Blume, D. Bock, R. Bock, E.-M. Bohne, D. Bucher, A. Buijs, E.-J. Buis, H. Büsching, L. Carlen, V. Chalyshev, S. Chattopadhyay, K.E. Chenawi, R. Cherbatchev, T. Chujo, A. Claussen, A.C. Das, M.P. Decowski, null Devanand, V. Djordjadze, P. Donni, I. Doubovik, S. Eliseev, K. Enosawa, H. Feldmann, P. Foka, S. Fokin, V. Frolov, M.S. Ganti, S. Garpman, O. Gavrishchuk, F.J.M. Geurts, T.K. Ghosh, R. Glasow, B. Guskov, H.A. Gustafsson, H.H. Gutbrod, R. Higuchi, I. Hrivnacova, M. Ippolitov, H. Kalechofsky, R. Kamermans, K.-H. Kampert, K. Karadjev, K. Karpio, S. Kato, S. Kees, H. Kim, B.W. Kolb, I. Kosarev, I. Koutcheryaev, A. Kugler, P. Kulinich, V. Kumar, M. Kurata, K. Kurita, N. Kuzmin, I. Langbein, A. Lebedev, Y.Y. Lee, H. Löhner, D.P. Mahapatra, J. Maharana, M.D.D. Majumdar, V. Manko, M. Martin, A. Maximov, R. Mehdiyev, G. Mgebrichvili, Y. Miake, D. Mikhalev, G.C. Mishra, I.S. Mittra, Y. Miyamoto, S. Mookerjee, D. Morrison, D.S. Mukhopadhyay, V. Myalkovski, H. Naef, G.K. Nandi, S.K. Nayak, T.K. Nayak, S. Neumaier, A. Nianine, V. Nikitine, S. Nikolaev, S. Nishimura, P. Nomokov, J. Nystrand, F.E. Obenshain, A. Oskarsson, I. Otterlund, M. Pachr, A. Parfenov, S. Pavliouk, T. Peitzmann, V. Petracek, S.C. Phatak, F. Plasil, M.L. Purschke, J. Rak, S. Raniwala, V.S. Ramamurthy, N.K. Rao, B. Raven, F. Retiere, K. Reygers, G. Roland, L. Rosselet, I. Roufanov, J. Rubio, S.S. Sambyal, R. Santo, S. Sato, P. Saxena, H. Schlagheck, H.-R. Schmidt, G. Shabratova, I. Sibariak, T. Siemiarczuk, K. Singh, B.C. Sinha, N. Slavine, K. Söderström, N. Solomey, S.P. Sørensen, P. Stankus, G. Stefanek, P. Steinberg, E. Stenlund, D. Stüken, M. Sumbera, T. Svensson, M.D. Trivedi, A. Tsvetkov, C. Twenhöfel, L. Tykarski, J. Urbahn, N.v. Eijndhoven, W.H.v. Heeringen, G.J.v. Nieuwenhuizen, A. Vinogradov, Y.P. Viyogi, A. Vodopianov, M.A. Vos, B. Wyslouch, K. Yagi, Y. Yokota, G.R. Young, Angelis, Aris, Doenni, Paul, Foka, Panagiota, Kalechofsky, Hal, Martin, Michel, Naef, Hanspeter, Rosselet, Laurent, Rubio, Juan Miguel, and Solomey, Nickolas

Subjects
Physics, Nuclear physics, Nuclear and High Energy Physics, Particle physics, Transverse plane, Large Hadron Collider, Photon, Meson production, Nuclear Theory, High Energy Physics::Experiment, ddc:500.2, Multiplicity (chemistry), Nuclear Experiment
Abstract

First results from the WA98 experiment on 33 TeV 208 Pb ion reactions with various targets measured at the CERN SPS are presented. Data on transverse energy production and particle multiplicity are discussed. Special emphasis is laid on photon and neutral meson production.

Published
1996

42. Single Photon Production in 200 A•GeV Sulphur on Gold Collisions WA80 Collaboration

Author

R. Albrecht, Mikhail Ippolitov, P. Steinhaeuser, V. Manko, K. Steffens, A. M. Poskanzer, B. W. Kolb, H. Wegner, A. A. Vinogradov, D. Bock, R. K. Bock, Martin Purschke, T. Peitzmann, B. Moskowitz, Agneta Oskarsson, G. R. Young, F. Plasil, Kh Kampert, H. H. Gutbrod, B Roters, F. Berger, J. Idh, R. L. Ferguson, E. Stenlund, G. Clewing, A. Eklund, S. Saini, Felix E. Obenshain, T. C. Awes, R. Santo, S. P. Sorensen, I. Otterlund, K. Karadjev, S. Fokin, S. Garpman, H. A. Gustafsson, R. Glasow, Peter Martin Jacobs, A.L. Lebedev, G Holker, O. Hansen, Hr Schmidt, R. Debbe, D. Stüken, I. Lund, Ma Bloomer, L. Dragon, and Herbert Löhner

Subjects
Nuclear physics, Physics, Photon, Excited state, Hadron, Plasma, Nuclear Experiment, Nuclear matter, Table (information), Extreme value theory, Spectral line
Abstract

The investigation of highly excited and compressed nuclear matter created in relativistic heavy ion collisions requires probes sensitive to the different stages of the development of the system. Among the characteristic signals listed in table 1, hadrons mainly probe the late stage of the reaction and their final spectra are influenced by their last scatterings. Electromagnetic probes, on the other hand, escape from the reaction zone without rescattering and probe the very early stage of the reaction, where temperatures and densities are highest. Electromagnetic probes are therefore particularly useful to study the possible formation of a Quark-Gluon Plasma, which is expected only at extreme values of temperature and density. The disadvantage of electromagnetic probes is that the signals are usually small and have to be disentangled from a tremendous physical background requiring a very high experimental precision and detailed treatment of the various background sources. In the case of photons this background consists mainly of photons from γ decaying hadrons like π0 and η.

Published
1995

43. Recent results from the WA80 experiment at CERN

Author

M Ippolitov, Karl-Heinz Kampert, Alexander Vinogradov, Vladislav Manko, F. Plasil, T. Peitzmann, Anders Nils Erik Oskarsson, A. Franz, G. Claesson, Herbert Löhner, P. Beckmann, R. Santo, B. Roters, D. Stüken, I. Otterlund, T. C. Awes, R. Schmidt, R. Glasow, A.L. Lebedev, S. Saini, G Holker, A. M. Poskanzer, F. Berger, K. Steffens, R. Bock, M. Hartig, G. Clewing, R. R. Debbe, B. W. Kolb, Hr Schmidt, S. P. Sørensen, O. Hansen, H. Wegener, G. R. Young, I. Lund, H. G. Ritter, D. Bock, R. L. Ferguson, P. Steinhaeuser, K. Karadjev, Sergey Fokin, H.H. Gutbrod, A. Eklund, Felix E. Obenshain, S. Garpman, H. A. Gustafsson, Peter Martin Jacobs, B. Moskowitz, R. Albrecht, J. Idh, Evert Anders Stenlund, Ma Bloomer, M. Purschke, and L. Dragon

Subjects
Nuclear physics, Physics, Nuclear and High Energy Physics, Particle physics, Large Hadron Collider, Nuclear Theory, Quark–gluon plasma, Thermal, Observable, Nuclear Experiment, Spectral line, Particle Physics - Experiment
Abstract

Results from the WA80 experiment on systematics of global observables, dE T / dη and dN ch / dη , as well as on spectra of identified particles are presented. Special attention is given to the target fragmentation region where two-pion correlations and proton distributions have been measured. Incorporation of strong rescattering phenomena into string models is found to provide a good description of most experimental data. Deviations to this are pointed out. The present status of the γ thermal / π 0 ratio as a signal of the quark gluon plasma is discussed.

Published
1992

44. Intermittency in $^{32}$S + S and $^{32}$S + Au collisions at the CERN SPS

Author

D. Bock, Agneta Oskarsson, L. Dragon, K. Söderström, B. Roters, R. L. Ferguson, P. Steinhauser, A. Franz, S. Saini, R. Bock, F. Plasil, R. Albrecht, F. Berger, R. Glasow, P. Jacobs, Ma Bloomer, A. Eklund, A. M. Poskanzer, K. Karadjev, T. C. Awes, R. Santo, B. W. Kolb, A.L. Lebedev, M. Purschke, Hr Schmidt, S. P. Sorensen, P. Beckmann, A. A. Vinogradov, G Holker, Mikhail Ippolitov, I. Otterlund, Vladislav Manko, H. A. Gustafsson, J. Idh, S. Garpman, A. Twyhues, G. Claesson, Kh Kampert, D. Stüken, M. Hartig, B. Moskowitz, K. Steffens, E. Stenlund, H. G. Ritter, R. Debbe, G. Clewing, Herbert Löhner, H.H. Gutbrod, Felix E. Obenshain, O. Hansen, G. R. Young, T. Peitzmann, I. Lund, and S. Fokin

Subjects
Nuclear reaction, Physics, Nuclear and High Energy Physics, Particle physics, Large Hadron Collider, Physics::Instrumentation and Detectors, Nuclear Theory, Hadron, Multiplicity (mathematics), Elementary particle, Charged particle, law.invention, Nuclear physics, law, Phase space, Intermittency, High Energy Physics::Experiment, Nuclear Experiment, Particle Physics - Experiment
Abstract

Nonstatistical or “intermittent” fluctuations of charged particle multiplicities have been investigated at the CERN SPS with the WA80 multiplicity array for 32S+S and 32S+Au collisions of varying centrality. Within the phase space domain studied there is no evidence for intermittency in these collisions beyond that accounted for by FRITIOF filtered through a full detector simulation.

Published
1992

45. Erratum: Centrality Dependence of Neutral Pion Production in158AGeVP208b+P208bCollisions [Phys. Rev. Lett. 81, 4087 (1998)]

Author

Jan Rak, S. Pavliouk, M. Kurata, Gunther Roland, Zubayer Ahammed, P. Steinberg, K. Söderström, S. K. Badyal, L. Barabach, D. P. Morrison, Tatsuya Chujo, Shunji Nishimura, E.-M. Bohne, M. D. Trivedi, Bikash Sinha, W. Pinanaud, I. Otterlund, P. Kulinich, Nikolai V Slavine, A.L.S. Angelis, B. W. Kolb, R. Cherbatchev, K. Enosawa, S. Kato, I. Roufanov, P. Foka, G. R. Young, A.S. Vodopianov, P. Donni, Joakim Nystrand, P. W. Stankus, V. Djordjadze, Herbert Löhner, Hr Schmidt, Y.Y. Lee, I. Koutcheryaev, V. Nikitine, T. Svensson, K. Karadjev, R. Higuchi, V. S. Ramamurthy, Sergey Fokin, R. Glasow, D. P. Mahapatra, Petr Nomokonov, P.V.K.S. Baba, C. Roy, A. Lebedev, Hyun-Chul Kim, L. Rosselet, V. Myalkovski, Rashmi Raniwala, S. Vörös, H. Kalechofsky, K. B. Bhalla, G. C. Mishra, Z.K. Böröcz, Teodor Siemiarczuk, H. Naef, O. P. Gavrishchuk, A. Nianine, Ashim Das, R. K. Bock, G. Stefanek, Frank Jm Geurts, MV Manzano Martin, A. Baldine, V. S. Bhatia, D. Mukhopadhyay, T. Krümpel, N. K. Rao, N. v. Eijndhoven, A. A. Vinogradov, C. Twenhöfel, I. Sibiriak, S. Bathe, D. Mikhalev, F. Plasil, S. P. Sorensen, S. Neumaier, H. Büsching, A. Parfenov, A. Maximov, S. Garpman, S. K. Nayak, D. Stüken, Peter M. Nilsson, G.S. Shabratova, R. Mehdiyev, B. Batiounia, I. Langbein, Michal Sumbera, H. A. Gustafsson, A. Claussen, G. Mgebrichvili, E. Stenlund, A. Kugler, B.N. Gus'kov, A. Agnihotri, Sergey Nikolaev, S. Eliseev, Christoph Blume, Susumu Sato, Basanta Kumar Nandi, N. Solomey, D. Bucher, K. Yagi, Agneta Oskarsson, Yasuo Miake, R. Kamermans, Ivana Hrivnacova, B. Raeven, Sudhir Raniwala, S. Kees, V. Avdeitchikov, J. Urbahn, J. M. Rubio, Klaus Johannes Reygers, T. Bernier, Mikhail Ippolitov, L. Tykarski, A. A. Tsvetkov, Sukalyan Chattopadhyay, M. P. Decowski, M. S. Ganti, Hiroyuki Sako, Bolek Wyslouch, A. Buijs, R. Santo, L. Luquin, Y. Miyamoto, I. Doubovik, Y. Yokota, T. K. Nayak, Martin Purschke, Sanjeev Singh Sambyal, Vladislav Manko, H.H. Gutbrod, Shiv K. Gupta, K. Kurita, M. R. Dutta Majumdar, David Olle Rickard Silvermyr, V. Astakhov, T. Peitzmann, C. Barlag, V. Chalyshev, Felix E. Obenshain, M. Pachr, F. Retiere, Madan M. Aggarwal, K. El Chenawi, Kh Kampert, N.A. Kuzmin, H. Schlagheck, I. Kosarev, T. K. Ghosh, V. Arefiev, T. C. Awes, Gerrit Jan van Nieuwenhuizen, Vladimir Frolov, Y. P. Viyogi, V. Petráček, Lars Carlén, V.G. Antonenko, and Krzysztof Karpio

Subjects
Physics, Nuclear physics, Particle physics, Pion, General Physics and Astronomy, Centrality
Published
2000

46. Single photon and neutral meson data from WA80

Author

F. Berger, D. Bock, T. C. Awes, B. Roters, Anders Nils Erik Oskarsson, R. Albrecht, P. Steinhaeuser, C. Blume, K. Steffens, R. R. Debbe, Alexander Vinogradov, B. W. Kolb, S. P. Sorensen, R. K. Bock, Herbert Löhner, K. Söderström, J. Idh, H.H. Gutbrod, D. Stüken, [No Value] Manko, C. Barlag, A. Eklund, D. Bucher, Hr Schmidt, L. Dragon, M Ippolitov, [No Value] Lund, Evert Anders Stenlund, F. Plasil, G. Claesson, S. Saini, H. E. Wegner, F. E. Obenshain, R. Glasow, A.L. Lebedev, G. Clewing, G Holker, T. Peitzmann, Ma Bloomer, O. Hansen, Martin Purschke, B. Moskowitz, G. R. Young, S. Garpman, H. A. Gustafsson, Peter Martin Jacobs, K. Karadjev, Sergey Fokin, [No Value] Otterlund, Am Poskanzer, Kh Kampert, and R. Santo

Subjects
Nuclear physics, Nuclear reaction, Massless particle, Physics, Nuclear and High Energy Physics, Particle physics, Photon, Pion, Meson, Hadron, Elementary particle, Boson

47. Elliptic emission of $K^+$ in 158A GeV Pb+Pb collisions

Author

P. Foka, Hr Schmidt, S. Dutt, David Olle Rickard Silvermyr, G. C. Mishra, Shunji Nishimura, I. Otterlund, E. Stenlund, A. Baldine, M. Kurata, T. H. Shah, R. Santo, M. D. Trivedi, MV Manzano Martin, B. W. Kolb, Y. Yokota, M. P. Decowski, Sanjeev Singh Sambyal, N.A. Kuzmin, L. Luquin, A. Maximov, D. Stüken, I. Langbein, Basanta Kumar Nandi, Sergey Nikolaev, S. Eliseev, I. Sibiriak, P. Kulinich, Nikolai V Slavine, Frank Jm Geurts, T. K. Nayak, G.S. Shabratova, A. Claussen, V. S. Ramamurthy, D. P. Mahapatra, J. Urbahn, Md. F. Mir, Ivana Hrivnacova, T. Krümpel, N. v. Eijndhoven, W. Pinanaud, V. Myalkovski, C. Blume, I. Roufanov, Hiroyuki Sako, D. Bucher, Petr Nomokonov, H. Kalechofsky, O. P. Gavrishchuk, B.N. Gus'kov, A. Agnihotri, A. A. Vinogradov, C. Roy, H. Naef, Rashmi Raniwala, A. Nianine, N. Solomey, S. Vörös, R. Higuchi, B. Batiounia, Yasuo Miake, Hyun-Chul Kim, E. C. v. d. Pijll, A.L.S. Angelis, Agneta Oskarsson, L. Rosselet, S. Pavliouk, S. Kees, V. Avdeitchikov, V. S. Bhatia, Mikhail Ippolitov, K. B. Bhalla, V. Djordjadze, Martin Purschke, Ashim Das, Klaus Johannes Reygers, K. Yagi, D. Mikhalev, P. Steinberg, S. K. Nayak, Sukalyan Chattopadhyay, M. S. Ganti, M. Pachr, Madan M. Aggarwal, Gunther Roland, R. Mehdiyev, H.H. Gutbrod, K. Kurita, K. El Chenawi, N. K. Rao, F. Retiere, K. Enosawa, S. Kato, P. W. Stankus, Susumu Sato, Herbert Löhner, C. Barlag, V. Chalyshev, Zubayer Ahammed, R. Glasow, R. Cherbatchev, S. K. Badyal, A.S. Vodopianov, A.L. Lebedev, Bikash Sinha, R. K. Bock, I. Koutcheryaev, F. E. Obenshain, P.V.K.S. Baba, P. Donni, Sudhir Raniwala, J. M. Rubio, L. Barabach, B. Raeven, S. Bathe, D. P. Morrison, F. Plasil, Tatsuya Chujo, A. A. Tsvetkov, Michal Sumbera, H. Büsching, Bolek Wyslouch, T. Peitzmann, A. Buijs, Y. Miyamoto, K. Söderström, Shiv K. Gupta, G. Mgebrichvili, D. S. Mukhopadhyay, L. Tykarski, I. Doubovik, Z.K. Böröcz, Vladislav Manko, Joakim Nystrand, E.-M. Bohne, S. P. Sorensen, A. Parfenov, G. R. Young, Peter M. Nilsson, Teodor Siemiarczuk, V.G. Antonenko, H. Schlagheck, I. Kosarev, T. K. Ghosh, Krzysztof Karpio, Jan Rak, Y. P. Viyogi, Vladimir Frolov, V. Petráček, Lars Carlén, G. Stefanek, V. Arefiev, T. C. Awes, Gerrit Jan van Nieuwenhuizen, K. Karadjev, Sergey Fokin, S. Garpman, H. A. Gustafsson, M. R. Dutta Majumdar, V. Astakhov, S. Neumaier, A. Kugler, R. Kamermans, T. Bernier, Kh Kampert, Y.Y. Lee, V. Nikitine, T. Svensson, Laboratoire SUBATECH Nantes (SUBATECH), Mines Nantes (Mines Nantes)-Université de Nantes (UN)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and WA98

Subjects
Physics, Nuclear reaction, Nuclear and High Energy Physics, Meson, 010308 nuclear & particles physics, Nuclear Theory, Hadron, Elementary particle, 01 natural sciences, 7. Clean energy, Charged particle, Nuclear physics, Baryon, Pion, [PHYS.HPHE]Physics [physics]/High Energy Physics - Phenomenology [hep-ph], 0103 physical sciences, Atomic physics, Nuclear Experiment, 010306 general physics, Nucleon
Abstract

We have studied the azimuthal angle distributions of identified charged particles near mid-rapidity region in semi-central Pb+Pb collisions at SPS energies. Our preliminary results show that π+ mesons and protons seem to be emitted in the reaction plane, while out-of-plane for K+ mesons. This phenomenon might be explained by the existence of another possible effect such as in-medium potential as well as the collective motion.

48. ALICE: Physics performance report, volume II

Author

Aamodt, K, Quintana, Aa, Achenbach, R, Acounis, S, Adamova, D, Adler, C, Aggarwal, M, Agnese, F, Rinella, Ga, Ahammed, Z, Ahmad, A, Ahmad, N, Ahmad, S, Akindinov, A, Akishin, P, Aleksandrov, D, Alessandro, B, Alfaro, R, Alfarone, G, Alici, A, Alme, J, Alt, T, Altinpinar, S, Amend, W, Andrei, C, Andres, Y, Andronic, A, Anelli, G, Anfreville, M, Angelov, V, Anzo, A, Anson, C, Anticic, T, Antonenko, V, Antonczyk, D, Antinori, F, Antinori, S, Antonioli, P, Aphecetche, L, Appelshauser, H, Aprodu, V, Arba, M, Arcelli, S, Argentieri, A, Armesto, N, Arnaldi, R, Arefiev, A, Arsene, I, Asryan, A, Augustinus, A, Awes, Tc, Aysto, J, Azmi, Md, Bablock, S, Badala, A, Badyal, Sk, Baechler, J, Bagnasco, S, Bailhache, R, Bala, R, Baldisseri, A, Baldit, A, Ban, J, Barbera, R, Barberis, Pl, Barbet, Jm, Barnafoldi, G, Barret, V, Bartke, J, Bartos, D, Basile, M, Basmanov, V, Bastid, N, Batigne, G, Batyunya, B, Baudot, J, Baumann, C, Bearden, I, Becker, B, Belikov, J, Bellwied, R, BELMONT MORENO, E, Belogianni, A, Belyaev, S, Benato, A, Beney, Jl, Benhabib, L, Benotto, F, Beoe, S, Berceanu, I, Bercuci, A, Berdermann, E, Berdnikov, Y, Bernard, C, Berny, R, Berst, Jd, Bertelsen, H, Betev, L, Bhasin, A, Baskar, P, Bhati, A, Bianchi, N, Bielcik, J, Bielcikova, J, Bimbot, L, Blanchard, G, Blanco, F, Blau, D, Blume, C, Blyth, S, Boccioli, M, Bogdanov, A, Boggild, H, Bogolyubsky, M, Boldizsar, L, Bombara, M, Bombonati, C, Bondila, M, Bonnet, D, Bonvicini, V, Borel, H, Borotto, F, Borshchov, V, Bortoli, Y, Borysov, O, Bose, S, Bosisio, L, Botje, M, Bottger, S, Bourdaud, G, Bourrion, O, Bouvier, S, Braem, A, Braun, M, BRAUN MUNZINGER, P, Bravina, L, Bregant, M, Bruckner, G, Brun, R, Bruna, E, Brunasso, O, Bruno, Ge, Bucher, D, Budilov, V, Budnikov, D, Buesching, H, Buncic, P, Burns, M, Burachas, S, Busch, O, Bushop, J, Cai, X, Caines, H, Calaon, F, Caldogno, M, Cali, I, Camerini, P, Campagnolo, R, Campbell, M, Cao, X, Capitani, Gp, Romeo, Gc, CARDENAS MONTES, M, Carduner, H, Carena, F, Carena, W, Cariola, P, Carminati, F, Casado, J, Diaz, Ac, Caselle, M, Castellanos, Jc, Castor, J, Catanescu, V, Cattaruzza, E, Cavazza, D, Cerello, P, Ceresa, S, Cerny, V, Chambert, V, Chapeland, S, Charpy, A, Charrier, D, Chartoire, M, Charvet, Jl, Chattopadhyay, S, Chepurnov, V, Chernenko, S, Cherney, M, Cheshkov, C, Cheynis, B, Chochula, P, Chiavassa, E, Barroso, Vc, Choi, J, Christakoglou, P, Christiansen, P, Christensen, C, Chykalov, Oa, Cicalo, C, CIFARELLI STROLIN, L, Ciobanu, M, Cindolo, F, Cirstoiu, C, Clausse, O, Cleymans, J, Cobanoglu, O, Coffin, Jp, Coli, S, Colla, A, Colledani, C, Combaret, C, Combet, M, Comets, M, Balbastre, Gc, DEL VALLE ZC, Contin, G, Contreras, J, Cormier, T, Corsi, F, Cortese, P, Costa, F, Crescio, E, Crochet, P, Cuautle, E, Cussonneau, J, Dahlinger, M, Dainese, A, Dalsgaard, Hh, Daniel, L, Das, I, Das, T, Dash, A, DA SILVA, R, Davenport, M, Daues, H, DE CARO, A, DE CATALDO, G, DE CUVELAND, J, DE FALCO, A, DE GASPARI, M, DE GIROLAMO, P, DE GROOT, J, DE GRUTTOLA, D, DE HAAS, A, DE MARCO, N, DE PASQUALE, S, DE REMIGIS, P, DE VAUX, D, Decock, G, Delagrange, H, DEL FRANCO, M, Dellacasa, G, Dell'Olio, C, Dell'Olio, D, Deloff, A, Demanov, V, Denes, E, D'Erasmo, G, Derkach, D, Devaux, A, DI BARI, D, DI BARTELOMEN, A, DI GIGLIO, C, DI LIBERTO, S, DI MAURO, A, DI NEZZA, P, Dialinas, M, Diaz, L, Valdes, Rd, Dietel, T, Dima, R, Ding, H, Dinca, C, Divia, R, Dobretsov, V, Dobrin, A, Doenigus, B, Dobrowolski, T, Dominguez, I, Dorn, A, Drouet, S, Dubey, Ae, Ducroux, L, Dumitrache, F, Dumonteil, E, Dupieux, P, Duta, V, Majumdar, Ad, Majumdar, Md, Dyhre, T, Efimov, L, Efremov, A, Elia, D, Emschermann, D, Engster, C, Enokizono, A, Espagnon, B, Estienne, M, Evangelista, A, Evans, D, Evrard, S, Fabjan, Cw, Fabrid, D, Faivre, J, Falchieri, D, Fantoni, A, Farano, R, Fearick, R, Fedorov, O, Fekete, V, Felea, D, Feofilov, G, Tellez, Af, Ferretti, A, Fichera, F, Filchagin, S, Filoni, E, Finck, C, Fini, R, Fiore, Em, Flierl, D, Floris, M, Fodor, Z, Foka, Y, Fokin, S, Force, P, Formenti, F, Fragiacomo, E, Fragkiadakis, M, Fraissard, D, Franco, A, Franco, M, Frankenfeld, U, Fratino, U, Fresneau, S, Frolov, A, Fuchs, U, Fujita, J, Furget, C, Furini, M, Girard, Mf, Gaardhoje, Jj, Gabrielli, A, Gaido, L, Torreira, Ag, Gallio, M, Gadrat, S, Gagliard, M, Gag, A, Gandolfi, E, Ganoti, P, Ganti, M, Garabatos, J, Lopez, Ag, Garizzo, L, Gaudichet, L, Gemme, R, Germain, M, Gheata, A, Gheata, M, Ghidini, B, Ghosh, P, Giolu, G, Giraudo, G, Giubellino, P, Glasow, R, Glassel, P, Ferreiro, Eg, Gutierrez, Cg, GONZALES TRUEBA LH, Gorbunov, S, Gorbunov, Y, Gos, H, Gosset, J, Gotovac, S, Gottschlag, H, Gottschalk, D, Grabski, V, Grassi, T, Gray, H, Grebenyuk, O, Grebieszkow, K, Gregory, C, Grigoras, C, Grion, N, Grigoriev, V, Grigoryan, A, Grigoryan, C, Grigoryan, S, Grishuk, Y, Gros, P, GROSSE OETRINGHAUS, J, Grossiord, Jy, Grosso, R, Grynyov, B, Guarnaccia, C, Guber, F, Guerin, F, Guernane, R, Guerzoni, M, Guichard, A, Guida, A, Guilloux, G, Gulkanyan, H, Gulbrandsen, K, Gunji, T, Gupta, A, Gupta, V, Gustafsson, Ha, Gutbrod, H, Hadjidakis, C, Haiduc, M, Hamar, G, Hamagaki, H, Hamblen, J, Hansen, Jc, Hardy, P, Hatzifotiadou, D, Harris, Jw, Hartig, M, Harutyunyan, A, Hayrapetyan, A, Hasch, D, Hasegan, D, Hehner, J, Heine, N, Heinz, M, Helstrup, H, Herghelegiu, A, Herlant, S, Corral, Gh, Herrmann, N, Hetland, K, Hille, P, Hinke, H, Hippolyte, B, Hoch, M, Hoebbel, H, Hoedlmoser, H, Horaguchi, T, Horner, M, Hristov, P, Hrivnacova, I, Hu, S, Guo, Ch, Humanic, T, Hurtado, A, Hwang, Ds, Ianigro, Jc, Idzik, M, Igolkin, S, Ilkaev, R, Ilkiv, I, Imhoff, M, Innocenti, Pg, Ionescu, E, Ippolitov, M, Irfan, M, Insa, C, Inuzuka, M, Ivan, C, Ivanov, A, Ivanov, M, Ivanov, V, Jacobs, P, Jacholkowski, A, Jancurova, L, Janik, R, Jasper, M, Jena, C, Jirden, L, Johnson, Dp, Jones, Gt, Jorgensen, C, Jouve, F, Jovanovic, P, Junique, A, Jusko, A, Jung, H, Jung, W, Kadija, K, Kamal, A, Kamermans, R, Kapusta, S, Kaidalov, A, Kakoyan, V, Kalcher, S, Kang, E, Kapitan, J, Kaplin, V, Karadzhev, K, Karavichev, O, Karavicheva, T, Karpechev, E, Karpio, K, Kazantsev, A, Kebschull, U, Keidel, R, Khan, Mm, Khanzadeev, A, Kharlov, Y, Kikola, D, Kileng, B, Kim, D, Kim, Ds, Kim, Dw, Kim, Hn, Kim, Js, Kim, S, Kinson, Jb, Kiprich, Sk, Kisel, I, Kiselev, S, Kisiel, A, Kiss, T, Kiworra, V, Klay, J, Bosing, Ck, Kliemant, M, Klimov, A, Klovning, A, Kluge, A, Kluit, R, Kniege, S, Kolevatov, R, Kollegger, T, Kolojvari, A, Kondratiev, V, Kornas, E, Koshurnikov, E, Kotov, I, Kour, R, Kowalski, M, Kox, S, Kozlov, K, Kralik, I, Kramer, F, Kraus, I, Kravcakova, A, Krawutschke, T, Krivda, M, Kryshen, E, Kucheriaev, Y, Kugler, A, Kuhn, C, Kuijer, P, Kumar, L, Kumar, N, Kumpumaeki, P, Kurepin, A, Kurepin, An, Kushpil, S, Kushpil, V, Kutovsky, M, Kvaerno, H, Kweon, M, Labbe, Jc, Lackner, F, DE GUEVARA PL, Lafage, V, LA ROCCA, P, Lamont, M, Lara, C, Larsen, Dt, Laurenti, G, Lazzeroni, C, LE BORNEC, Y, LE BRIS, N, LE GAILLIARD, C, Lebedev, V, Lecoq, J, Lee, Ks, Lee, Sc, 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GAUDICHET, R. GEMME, G. GIRAUDO, P. GIUBELLINO, M. IDZIK, S. MARTOIU, A. MARZARI CHIESA, M. MASERA, G. MAZZA, P. MEREU, M. MONTENO, A. MUSSO, C. OPPEDISANO, A. PICCOTTI, F. POGGIO, F. PRINO, L. RICCATI, A. RIVETTI, E. SCOMPARIN, D. STOCCO, F. TOSELLO, L. TOSCANO, G. TRAVAGLIA, E. VERCELLIN, A. WERBROUCK, R. WHEADON, F. YERMIA, Y. MIAKE, S. ESUMI, J.J. F. BUSKOP, A.P. DE HAAS, C. IVAN, R. KAMERMANS, A. MISCHKE, G. NOOREN, C.J. OSKAMP, TH. PEITZMANN, E. SIMILI, O. SOKOLOV, A. VAN DEN BRINK, N. VAN EIJNDHOVEN, H. ENYO, K. FUJIWARA, H. KANO, H. ONISHI, A. DELOFF, T. DOBROWOLSKI, K. KARPIO, M. MALEK, H. MALINOWSKI, K. REDLICH, T. SIEMIARCZUK, G. STEFANEK, L. TYKARSKI, G. WILK, Z. CHAJECKI, H. GOS, M. JANIK, M. JEDYNAK, A. KISIEL, T.J. PAWLAK, W.S. PERYT, J. PLUTA, P. SKOWRONSKI, M. SLODKOWSKI, P. SZUBA, T. TRACZYK, E.S. CONNER, R. KEIDEL, X. CAI, H.T. DING, H. LIU, X.R. WANG, H.Y. YANG, Z.B. YIN, D.C. ZHOU, X. CAO, Q. LI, Y.Z. LIU, G. SU, L. TAN, G.X. ZHU, M. ATAYAN, A. GRIGORYAN, H. GULKANYAN, A. HARUTYUNYAN, A. HAYRAPETYAN, V. KAKOYAN, M. POGHOSYAN, G. SARGSYAN, T. ANTICIC, K. KADIJA, and T. SUSA

Subjects
Physics, Particle physics, Nuclear and High Energy Physics, Large Hadron Collider, 010308 nuclear & particles physics, Detector, Monte Carlo method, Observable, 7. Clean energy, 01 natural sciences, Particle identification, Nuclear physics, 0103 physical sciences, ALICE (propellant), 010306 general physics, Nuclear Experiment, ALICE, physics, performance, detector, CERN, QGP, LHC, Event (particle physics), Event reconstruction
Abstract

ALICE is a general-purpose heavy-ion experiment designed to study the physics of strongly interacting matter and the quark-gluon plasma in nucleus-nucleus collisions at the LHC. It currently involves more than 900 physicists and senior engineers, from both the nuclear and high-energy physics sectors, from over 90 institutions in about 30 countries. The ALICE detector is designed to cope with the highest particle multiplicities above those anticipated for Pb-Pb collisions (dN(ch)/dy up to 8000) and it will be operational at the start-up of the LHC. In addition to heavy systems, the ALICE Collaboration will study collisions of lower-mass ions, which are a means of varying the energy density, and protons (both pp and pA), which primarily provide reference data for the nucleus-nucleus collisions. In addition, the pp data will allow for a number of genuine pp physics studies. The detailed design of the different detector systems has been laid down in a number of Technical Design Reports issued between mid-1998 and the end of 2004. The experiment is currently under construction and will be ready for data taking with both proton and heavy-ion beams at the start-up of the LHC. Since the comprehensive information on detector and physics performance was last published in the ALICE Technical Proposal in 1996, the detector, as well as simulation, reconstruction and analysis software have undergone significant development. The Physics Performance Report (PPR) provides an updated and comprehensive summary of the performance of the various ALICE subsystems, including updates to the Technical Design Reports, as appropriate. The PPR is divided into two volumes. Volume I, published in 2004 (CERN/LHCC 2003-049, ALICE Collaboration 2004 J. Phys. G: Nucl. Part. Phys. 30 1517-1763), contains in four chapters a short theoretical overview and an extensive reference list concerning the physics topics of interest to ALICE, the experimental conditions at the LHC, a short summary and update of the subsystem designs, and a description of the offline framework and Monte Carlo event generators. The present volume, Volume II, contains the majority of the information relevant to the physics performance in proton-proton, proton-nucleus, and nucleus-nucleus collisions. Following an introductory overview, Chapter 5 describes the combined detector performance and the event reconstruction procedures, based on detailed simulations of the individual subsystems. Chapter 6 describes the analysis and physics reach for a representative sample of physics observables, from global event characteristics to hard processes.

Published
2006

49. Suppression of high-p{T} neutral pion production in central Pb+Pb collisions at sqrt[S{NN}]=17.3 GeV relative to p+C and p+Pb collisions.

Author

Aggarwal MM, Ahammed Z, Angelis AL, Antonenko V, Arefiev V, Astakhov V, Avdeitchikov V, Awes TC, Baba PV, Badyal SK, Bathe S, Batiounia B, Baumann C, Bernier T, Bhalla KB, Bhatia VS, Blume C, Bucher D, Büsching H, Carlén L, Chattopadhyay S, Decowski MP, Delagrange H, Donni P, Majumdar MR, El Chenawi K, Dubey AK, Enosawa K, Fokin S, Frolov V, Ganti MS, Garpman S, Gavrishchuk O, Geurts FJ, Ghosh TK, Glasow R, Guskov B, Gustafsson HA, Gutbrod HH, Hrivnacova I, Ippolitov M, Kalechofsky H, Kamermans R, Karadjev K, Karpio K, Kolb BW, Kosarev I, Koutcheryaev I, Kugler A, Kulinich P, Kurata M, Lebedev A, Löhner H, Luquin L, Mahapatra DP, Manko V, Martin M, Martínez G, Maximov A, Miake Y, Mishra GC, Mohanty B, Mora MJ, Morrison D, Mukhanova T, Mukhopadhyay DS, Naef H, Nandi BK, Nayak SK, Nayak TK, Nianine A, Nikitine V, Nikolaev S, Nilsson P, Nishimura S, Nomokonov P, Nystrand J, Oskarsson A, Otterlund I, Pavliouk S, Peitzmann T, Peressounko D, Petracek V, Phatak SC, Pinganaud W, Plasil F, Purschke ML, Rak J, Rammler M, Raniwala R, Raniwala S, Rao NK, Retiere F, Reygers K, Roland G, Rosselet L, Roufanov I, Roy C, Rubio JM, Sambyal SS, Santo R, Sato S, Schlagheck H, Schmidt HR, Schutz Y, Shabratova G, Shah TH, Sibiriak I, Siemiarczuk T, Silvermyr D, Sinha BC, Slavine N, Söderström K, Sood G, Sørensen SP, Stankus P, Stefanek G, Steinberg P, Stenlund E, Sumbera M, Svensson T, Tsvetkov A, Tykarski L, V D Pijll EC, V Eijndhoven N, V Nieuwenhuizen GJ, Vinogradov A, Viyogi YP, Vodopianov A, Vörös S, Wysłouch B, and Young GR

Abstract

Neutral pion transverse momentum spectra were measured in p+C and p+Pb collisions at sqrt[S{NN}]=17.4 GeV at midrapidity (2.3 less than or approximately equal eta{lab} less than or approximately equal 3.0) over the range 0.7 less than or approximately equal p{T} less than or approximately equal 3.5 GeV/c. The spectra are compared to pi{0} spectra measured in Pb+Pb collisions at sqrt[S{NN}]=17.3 GeV in the same experiment. For a wide range of Pb+Pb centralities (N{part} less than or approximately equal 300), the yield of pi{0}'s with p{T} greater than or approximately equal 2 GeV/c is larger than or consistent with the p+C or p+Pb yields scaled with the number of nucleon-nucleon collisions (N{coll}), while for central Pb+Pb collisions with N{part}greater than or approximately equal 350, the pi{0} yield is suppressed.

Published
2008
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50. Interferometry of direct photons in central 208Pb + 208Pb collisions at 158A GeV.

Author

Aggarwal MM, Ahammed Z, Angelis AL, Antonenko V, Arefiev V, Astakhov V, Avdeitchikov V, Awes TC, Baba PV, Badyal SK, Bathe S, Batiounia B, Bernier T, Bhalla KB, Bhatia VS, Blume C, Bucher D, Büsching H, Carlén L, Chattopadhyay S, Decowski MP, Delagrange H, Donni P, Dutta Majumdar MR, el Chenawi K, Dubey AK, Enosawa K, Fokin S, Frolov V, Ganti MS, Garpman S, Gavrishchuk O, Geurts FJ, Ghosh TK, Glasow R, Guskov B, Gustafsson HA, Gutbrod HH, Hrivnacova I, Ippolitov M, Kalechofsky H, Karadjev K, Karpio K, Kolb BW, Kosarev I, Koutcheryaev I, Kugler A, Kulinich P, Kurata M, Lebedev A, Löhner H, Luquin L, Mahapatra DP, Manko V, Martin M, Martínez G, Maximov A, Miake Y, Mishra GC, Mohanty B, Mora MJ, Morrison D, Moukhanova T, Mukhopadhyay DS, Naef H, Nandi BK, Nayak SK, Nayak TK, Nianine A, Nikitine V, Nikolaev S, Nilsson P, Nishimura S, Nomokonov P, Nystrand J, Oskarsson A, Otterlund I, Peitzmann T, Peressounko D, Petracek V, Phatak SC, Pinganaud W, Plasil F, Purschke ML, Rak J, Raniwala R, Raniwala S, Rao NK, Retiere F, Reygers K, Roland G, Rosselet L, Roufanov I, Roy C, Rubio JM, Sambyal SS, Santo R, Sato S, Schlagheck H, Schmidt HR, Schutz Y, Shabratova G, Shah TH, Sibiriak I, Siemiarczuk T, Silvermyr D, Sinha BC, Slavine N, Söderström K, Sood G, Sørensen SP, Stankus P, Stefanek G, Steinberg P, Stenlund E, Sumbera M, Svensson T, Tsvetkov A, Tykarski L, v d Pijll EC, von Eijndhoven N, von Nieuwenhuizen GJ, Vinogradov A, Viyogi YP, Vodopianov A, Vörös S, Wysłouch B, and Young GR

Abstract

Two-particle correlations of direct photons were measured in central 208Pb+208Pb collisions at 158A GeV. The invariant interferometric radii were extracted for 100

Published
2004
Full Text
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