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Your search keyword '"M. M. Mobayyen"' showing total 13 results
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13 results on '"M. M. Mobayyen"'

1. A measurement of σtot(γp) at

Author

Ada Solano, S. Limentani, M. Z. Wang, G.A. Blair, A. Seidman, Stan Bentvelsen, D. Haun, Giuseppe Iacobucci, S. Kartik, Francois Corriveau, A. Kotański, P. Morawitz, S. Kasai, A. Cassidy, M. Nakahata, Marco Schioppa, P. G. Pelfer, S.J.P. Smith, K. U. Pösnecker, J. Nash, U. Schneekloth, T. Neumann, T. Barillari, Y. Eisenberg, M. M. Mobayyen, R. Seidlein, A. Mass, Roberto Casalbuoni, S. Kitamura, P.F. Ermolov, H. F.W. Sadrozinski, A. Shapira, Fernando Barreiro, D. Monaldi, K. Heinloth, R. Casaccia, H. Müsch, P. Cloth, J. Kochocki, Mauro Morandin, Z. Jakubowski, Giuseppe Levi, I. Gialas, R. Imlay, Rosario Nania, S. De Jong, S. Magill, A. Prinias, K. Jelen, Ulf Behrens, Federico Cindolo, H. Kowalski, F. Ciralli, W. Koch, F. J. Sciulli, A. Hofmann, Tadeusz Kowalski, C.J.S. Morgado, A. Freidhof, Michele Arneodo, N.C. Roocroft, S. Kramarczyk, L. W. Hung, J. Engelen, G. Poelz, James Crittenden, A. Dannemann, G. Sartorelli, A Furtjes, F. Gasparini, A. A. Savin, J. F. Labs, L. Suszycki, A. Bargende, W. Dorth, F. Dal Corso, J. Straver, L. Hagge, N. Dyce, Tobias M. Haas, T. Hasegawa, A. Leich, A. Margotti, Roberto Carlin, Shoichi Yamada, R.C.E. Devenish, Debades Bandyopadhyay, D. Revel, A. A. Voronin, T. Ishii, B. Lisowski, T. J. Llewellyn, A. Stopczyński, C. Voci, Silvia Maselli, M. Momayezi, G. Laurenti, G. Barbagli, G. Cara Romeo, E. Tscheslog, S. Nagayama, R. Ayed, R. L. Talaga, S. Bhadra, F. Ikraiam, G. Cases, R. Yoshida, B.D. Burow, I. Butterworth, T. Kȩdzierski, Y. Iga, J. M. Pawlak, A. Vorvolakos, D. McQuillan, A. Zichichi, Matthias Kasemann, R. Timellini, A. Dake, D. Notz, C. Nemoz, K. Muchorowski, N. H. Brook, T.L. Short, R. R. McNeil, Ta Romanowski, Daniele Dominici, R. Wedemeyer, J.D. Prentice, E. Barberis, Samuel Silverstein, K. Charchuła, P. Erhard, Jens Hartmann, T. W. Jones, Anna Goussiou, M. Löwe, R. Loveless, U. Mallik, T. Khatri, J.W. Mitchell, Greg P Heath, L. Chen, Eduardo Ros, R. J. Cashmore, G. L. Bashindzhagyan, R. J. Teuscher, M. Geerts, K. Blankenship, Luis Labarga, J. J. Whitmore, M. Derrick, T. Tymieniecka, Danuta Kisielewska, C.R. Sampson, R. J. Seifert, P.M. Hallam-Baker, H. Dabbous, M. de Kamps, N. Pavel, G. Grzelak, J. F. Martin, P. Kooijman, F. F. Wilson, M. Chiarini, U. Kötz, Vivian O'Dell, H. J. Kim, T. C. Bacon, M. Lomperski, Stefano Maria Mari, R. Gläser, Guenter Wolf, A. Bernstein, Y. Zamora Garcia, A. Francescato, C. Youngman, Hideki Okuno, W. Burkot, R. J. Nowak, S. De Pasquale, J.K. Mayer, S. Schlenstedt, I. Laakso, M. Brkic, J. K. Bienlein, R. Szwed, D. Shaw, P. J. Bussey, S. Qian, G. D'Agostini, Ben Bylsma, B. Lu, J. Milewski, J. Krüger, J. F. de Trocóniz, M. Nuti, J. Schroeder, H. Chaves, Masashi Hazumi, L. Zawiejski, T. Y. Ling, P. de Jong, Q. Lin, Inkyu Park, F. Benard, G. Zech, S. De Curtis, H. Hartmann, Y. Nakamitsu, Katsuo Tokushuku, Giovanni Abbiendi, M.I. Ferrero, R. J. Tapper, Robert Klanner, M. Rohde, N. A. McCubbin, T. S. Yoon, K. Wick, B. Musgrave, I. Fleck, Thomas Trefzger, A.G. Tenner, H.-P. Jakob, H. van der Lugt, Umberto Dosselli, J.B. Lane, E. Paul, David Cussans, Janusz Chwastowski, K. Sugano, Rr Rau, R. Brugnera, L. S. Durkin, J. N. Lim, A. Contin, W. Weihs, D. J. Gilkinson, V. A. Kuzmin, D. C. Bailey, E. A. De Wolf, G. Jahnen, Claudia Glasman, Sridhara Dasu, M. De Giorgi, Halina Abramowicz, K. Stojda, W. Metcalf, F. Turkot, R. Stanek, U. Holm, S. Mengel, J. Mainusch, Gm Levman, B. Gutjahr, Luca Stanco, C. Markou, M. Adamus, G. Marini, B. Löhr, E. Badura, M. Kückes, Np Zotov, A.K. Wróblewski, A. Bamberger, C. Rethfeldt, W. Schott, F. Selonke, E. Hilger, T. Bienz, G. Bruni, S. D'Auria, P. Joos, Cd Catterall, R. Heifetz, F. Arzarello, M. Rost, A. Meyer, B. Foster, F. W. Bullock, Mariusz Flasiński, Luisa Cifarelli, M. Krzyżanowski, A. Byrne, Neville Harnew, J. Roldán, B. Schneider, M. Lancaster, D.D. Reeder, A. Montag, B. Diekmann, B.Y. Oh, E. Rulikowska-Zarȩbska, Krzysztof Piotrzkowski, J.A. Zakrzewski, C. A. Heusch, C. Raine, P. Nylander, J. Leslie, J. Del Peso, T. Watanabe, C. Li, Lucia Votano, E. Lohrmann, Kr Long, C. Fordham, G. Castellini, M. Zachara, H. Kreutzmann, L.E. Sinclair, J. C. Vermeulen, M. Mattioli, R. van Woudenberg, G. Theisen, U. Karshon, Lothar At Bauerdick, T. Woeniger, L. Lamberti, F.S. Chlebana, K.M. Furutani, M.B. Crombie, H. Uijterwaal, P.M. Patel, A.F. Żarnecki, W. Schulz, Luis Hervas, D. Boscherini, W.N. Murray, G. Anzivino, G. Susinno, M. Nakao, P. Borzemski, R. S. Orr, P. B. Straub, E.E. Ronat, B. Behrens, Nicolo Cartiglia, J. Ciborowski, R. Ullmann, S. Yang, V.A. Jamieson, M. Dardo, C. Coldewey, R.S. Gilmore, H.J. Grabosch, B. Krebs, F. Zetsche, J. L. Thron, D. Lüke, T. Poser, M. Bonori, Maurizio Basile, S. Nickel, L. Bellagamba, D. B. Miller, J. Gajewski, T. Massam, J. Biltzinger, A.H. Walenta, H. Hultschig, H. Kammerlocher, B. H. Wiik, John Hart, I. Ali, Wr Frisken, S. Ritz, D. S. Hanna, L.W. Wiggers, Masami Chiba, G. Maccarrone, Klaus Kurt Desch, C. Del Papa, I. McArthur, P. Bruni, Costas Foudas, L.W. Mo, Michele Guida, Jose Repond, W. H. Smith, A. Caldwell, G.G. Stairs, G. Gloth, Mário Costa, U. Contino, T. Tsurugai, E. McCliment, J.C. Giddings, D.M. Gingrich, A. Seiden, F. Frasconi, M. Przybycień, F. Palmonari, S.S. Wilson, D. Zer-Zion, A. T. Doyle, A.M. Khan, R. Schattevoy, G. Bari, J.-L. Schneider, W. Vogel, P. Luffman, K. Eskreys, T.P. Shah, D. H. Saxon, J.S.T. Ng, P. Göttlicher, B. Hubbard, M. Ptacek, Aharon Levy, J.R. Forbes, K.W. McLean, D. Krakauer, A. Ladage, S. Söldner-Rembold, M. Iori, A. Nigro, Y. Nagasawa, A. Dwuraźny, J. Mollen, H.F. Fawcett, E.N. Kuznetsov, O. Mańczak, G. F. Hartner, U. Camerini, A. M. Cooper-Sarkar, S. Dagan, R. Walczak, Yu. A. Golubkov, H. Tiecke, M. Posocco, Geoffrey Smith, Detlef Filges, D. K. Hasell, K. O'Shaughnessy, A. Kruse, J. Shulman, R. Salomon, Juan Terron, M. Kasprzak, P. Giusti, G. Drews, J. A. Parsons, W. Hain, K. Dierks, J. M. Butterworth, J. Zaja̧c, B. Nizioł, A. Eskreys, S. K. Park, Amedeo Staiano, Tachishige Hirose, M. Kuze, R. Hamatsu, J. Kulka, L. Wai, P.L. Makkar, R. Stroili, C. Peroni, M. Roco, G. Geitz, W. Kröger, Dg Stairs, J. Malos, and C. Fanin

Subjects
Physics, Nuclear and High Energy Physics, ZEUS (particle detector), Photon, High Energy Physics::Phenomenology, Nuclear Theory, Detector, Virtual particle, HERA, Particle detector, Particle scattering, Nuclear physics, Cross section (physics), High Energy Physics::Experiment, Nuclear Experiment
Abstract

The total photoproduction cross section is determined from a measurement of electroproduction with the ZEUS detector at HERA. The Q2 values of the virtual photons are in the range 10−7

Published
1992

2. Inclusive ϱ0 production in charged current interactions

Author

Norbert Schmitz, G. Corrigan, W. Gebel, B. W. Kennedy, E. F. Clayton, Christoph Geich-Gimbel, D. Lanske, K. Böckmann, R. P. Middleton, W. Wittek, G. Myatt, B. Saitta, D. R. O. Morrison, H. Wachsmuth, R. Schulte, D. B. Miller, B. Nellen, M. Aderholz, J. Mittendorfer, Peter Schmid, H. Grässler, G. T. Jones, D. Radojicic, L. Deck, Jon-Paul R. Wells, H. Klein, H. Saarikko, Steve O'Neale, Keith W. J. Barnham, M. M. Mobayyen, E. Hoffmann, and F. Hamisi

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Large Hadron Collider, Hydrogen, Hadron, chemistry.chemical_element, Pseudoscalar meson, Nuclear physics, Direct production, Pion, chemistry, High Energy Physics::Experiment, Multiplicity (chemistry), Nuclear Experiment, Charged current
Abstract

Inclusive ϱ0 production has been studied in antineutrino-proton charged current interactions, using a sample of 3340 events obtained in BEBC filled with hydrogen and exposed to the CERN wideband antineutrino beam. An average multiplicity of 0.11 ± 0.02ϱ0 per event at a mean hadronic mass W of 4.2 GeV is observed. The ϱ0 production characteristics are determined as functions of pT, xF, and z. The ratio ϱ0/“π0” is found to be low at small z values consistent with centrally produced pions coming mainly from resonances. At large z values this ratio approaches 0.45 ± 0.15 which is compatible with a vector/pseudoscalar meson direct production ratio of one. The results are compared with those obtained from neutrino-proton interactions in the same experimental set-up.

Published
1986

3. Observation of coherent diffractive charged current interactions of antineutrinos on neon nuclei

Author

M. Calicchio, E. Zevgolatakos, M. Aderholz, N. Armenise, C. Vallée, E. Simopoulou, J. H. Bartley, V. Brisson, K. L. Wernhard, R. A. Sansum, Salvatore Nuzzo, D. R. O. Morrison, A. M. Cooper, T. Azemoon, F. Ruggieri, F. W. Bullock, Jon-Paul R. Wells, Keith W. J. Barnham, J.G. Guy, A. Vayaki, W. Wittek, T. Coghen, G. Gerbier, Steve O'Neale, C. Kochowski, K. Varvell, P. Kasper, W. Venus, O. Erriquez, J. Chwastowski, P. O. Hulth, D. Bertrand, Pierre Marage, Jean Sacton, M. A. Parker, P. Petiau, M. M. Mobayyen, S. Leighton-Davies, G. T. Jones, M. Talebzadeh, J. P. Baton, R. P. Middleton, P. J. Fitch, E. F. Clayton, and M. Neveu

Subjects
Physics, Nuclear and High Energy Physics, Nuclear Theory, Hadron, chemistry.chemical_element, High momentum, Nuclear physics, Neon, Fragmentation (mass spectrometry), chemistry, Physique des particules élémentaires, Atomic physics, Nuclear Experiment, Charged current
Abstract

First observation is reported of semi-inclusive coherent diffractive charged current interactions of antineutrinos on neon nuclei. A sharp peaking towards zero is observed in the, 0, SCOPUS: ar.j, info:eu-repo/semantics/published

Published
1984

4. Measurement of the neutral to charged current cross section ratios for neutrino and and antineutrino interactions on protons

Author

D. Haidt, W. Wittek, L. Deck, E. Hoffmann, R. W. L. Jones, M. Aderholz, D. B. Miller, J. Mittendorfer, M. M. Mobayyen, G. Corrigan, G. T. Jones, D. Radojicic, H. Wachsmuth, N. Schmitz, B. W. Kennedy, F. W. Bullock, G. Myatt, S. W. O'Neale, H. Klein, S. J. Towers, D. R. O. Morrison, Peter Schmid, B. Saitta, F. Hamisi, P. N. Shotton, P. J. Fitch, S. Burke, and M. L. Retter

Subjects
Nuclear physics, Physics, Nuclear and High Energy Physics, Particle physics, Muon, Large Hadron Collider, Neutral current, Isoscalar, Hadron, Bubble chamber, Neutrino, Charged current
Abstract

The ratios Rvp and Rvp of the neutral current to charged current cross sections for neutrino and antineutrino interactions on protons have been measured in BEBC. The beam was the CERN SPS 400 GeV wideband beam. The bubble chamber, equipped with the standard External Muon Identifier, was surrounded with an additional plane of wire chambers (Internal Picket Fence), which was added to improve neutral current event identification. For a total transverse momentum of the charged hadrons above 0.45 GeV/c and a charged multiplicity of at least 3, it was found that Rvp = 0.384 ± 0.015 and Rvp = 0.338 ± 0.014 ± 0.016, corresponding to a value of sin 2 θ w (M w MS of 0.225 ± 0.030 . Combining the results from hydrogen and an isoscalar target, the differences of the neutral current chiral coupling constants were found to be u2l−d2L = −0.080 ± 0.043 ± 0.012 and u2R−d2R = 0.021±0.055±0.028.

Published
1986

5. Development of the ZEUS central tracking detector

Author

B. Foster, A.K. Jamdagni, Neville Harnew, D. McQuillan, D. Shaw, G. Nixon, R. J. Cashmore, R.J. Tapper, John Hart, D.J. White, K.R. Long, M. M. Mobayyen, R.C. Devenish, J. Shulman, Fergus Wilson, G.L. Salmon, S.M. Tkaczyk, Douglas Gingrich, L W Toudup, A.J. Sephton, T.J. Fraser, S. Smith, Jon-Paul R. Wells, J. Malos, J. Nash, E.W.G. Wallis, C.J.S. Morgado, C.B. Brooks, J.H.C. Roberts, R. Wastie, P.D. Shield, T.B. Shaw, G.J. Lush, I. Silvester, T.J. Llewellyn, N. A. McCubbin, R.S. Gilmore, D. H. Saxon, A.G. Parham, G.P. Heath, I. McArthur, D.E. Strachan, M.D. Gibson, K.L. Yeo, A.R. Holmes, T.W. Jones, F. W. Bullock, D. B. Miller, B.T. Payne, J.W. Hiddleston, and N.C. Martin

Subjects
Physics, Nuclear and High Energy Physics, ZEUS (particle detector), Physics::Instrumentation and Detectors, business.industry, Track (disk drive), Detector, Tracking (particle physics), Nuclear physics, High Energy Physics::Experiment, Computer vision, Artificial intelligence, business, Instrumentation, Event (particle physics)
Abstract

The design concept and development of the ZEUS central tracking detector is described. This is a cylindrical drift chamber designed for track reconstruction, electron identification and event triggering in a high-crossing-rate, high-magnetic-field environment.

Published
1989

6. Total cross sections νμ and ḡnμcharged-current interactions between 20 and 200 GeV

Author

M. M. Mobayyen, B. Wünsch, H. Deden, E. Pagiola, Ch. Peyrou, Luc Pape, H. Wachsmuth, Th. Kokott, H. Klein, A. Vayaki, D. R. O. Morrison, I. Butterworth, A. Petrides, D.C. Cundy, F.J. Hasert, E. Simopoulou, K. Böckmann, P. O. Hulth, W. G. Scott, H. Grässler, P. Bosetti, Keith W. J. Barnham, B. Nellen, C. Penfold, Donald H. Perkins, A. Grant, P. Fritze, Daniel Vignaud, K. J. Powell, D. B. Miller, Reinhard W. Schulte, C. Albajar, G. Iaselli, B. Saitta, B. Tallini, J. Velasco, T. Bolognese, and D. Radojicic

Subjects
Physics, Nuclear and High Energy Physics, Antiparticle, Particle physics, Muon, Physics::Instrumentation and Detectors, Astrophysics::High Energy Astrophysical Phenomena, Elementary particle, Nuclear physics, Antimatter, High Energy Physics::Experiment, Neutrino, Nuclear Experiment, Nucleon, Big European Bubble Chamber, Lepton
Abstract

Exposures of the Ne/H 2 filled Big European Bubble Chamber (BEBC) to a dichromatic neutrino (antineutrino) beam produced by 400 GeV protons of the CERN SPS yielded ∼ 3100 events with a negative, and ∼ 1100 with a positive, muon. The neutrino flux is determined from the muon flux in the shielding. Assuming a linear energy dependence of the cross section, the values σ E between 20 and 200 GeV are found to be 0.657 ± 0.012 (stat.) ± 0.027 (syst.) and 0.309 ± 0.009 (stat.) ± 0.013 (syst.) cm 2 (GeV nucleon) −1 , for neutrinos and antineutrinos, respectively. The scaling variable q 2 E decreases significantly with increasing energy both for neutrinos and antineutrinos.

Published
1982

7. Analysis of fragmentation functions of narrow band ν and interactions on an isoscalar target

Author

Luc Pape, J.S. Chima, B. Nellen, A. Vayaki, W. Glimpf, D. B. Miller, P. O. Hulth, G. Myatt, H. Deden, A. Petridis, F. H. Hasert, J. Morfin, H. Grässler, G. T. Jones, H. Saarikko, I. Butterworth, W. G. Scott, Reinhard W. Schulte, R. H. Giles, E. Simopoulou, K. Böckmann, Daniel Vignaud, P. Bosetti, T. P. Kokott, J. R. Batley, D. Radojicic, Donald H. Perkins, B. Wünsch, M. M. Mobayyen, B. Saitta, C. Albajar, T. Bolognese, A. Grant, Keith W. J. Barnham, E. F. Clayton, Ch. Peyrou, B. Tallini, J. Velasco, M.E. Mermikides, D.C. Cundy, P. Fritze, J. L. Lloyd, H. Wachsmuth, and C. Penfold

Subjects
Nuclear physics, Physics, Nuclear and High Energy Physics, Narrow band, Fragmentation (mass spectrometry), Isoscalar
Published
1982

8. Strange particle production in ν and neon interactions

Author

M.E. Mermikides, M. M. Mobayyen, H. Wachsmuth, A. Petrides, J.S. Chima, B. Nellen, P. Fritze, B. Wünsch, Christoph Geich-Gimbel, W. Glimpf, G. Iaselli, Jon-Paul R. Wells, H. Grässler, C. Albajar, E. Simopoulou, T. Bolognese, D. R. O. Morrison, K. Schultze, Luc Pape, E. F. Clayton, J. Velasco, H. Klein, A. Vayaki, Reinhard W. Schulte, I. Butterworth, A. Grant, M. Bloch, P. Bosetti, and P. O. Hulth

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Strange quark, Hadron, chemistry.chemical_element, Nuclear physics, Momentum, Neon, Angular distribution, chemistry, Transverse momentum, Neutrino, Charged current
Abstract

The inclusive production of K0's and Λ's has been investigated in neutrino and antineutrino interactions in BEBC, filled with a neon-hydrogen mixture. The inclusive rates for the 3083 (1022) ν (ν) induced charged current events are (23.0 ± 1.7)% ((21.9 ± 2.8)%) for K0's and (5.7 ± 0.7)% ((6.5 ± 1.2)%) for Λ's. The general behaviour of the K0's and Λ's is found to be similar to that in νp interactions and π+p interactions at lower 〈W〉. In the hadronic c.m.s. K0's are produced mostly forwards, Λ's predominantly in the backward hemisphere. The data indicate that K0's produced in ν interactions on average carry a larger fraction of the total available momentum than those in ν induced reactions. The dependences of the average transverse momentum on the variables Q2, W2 and Bjorken x are presented.

Published
1982

9. Search for tau-neutrino interactions in the BEBC beam dump experiment

Author

B. Wünsch, Norbert Schmitz, P. Bostock, H. Kreutzmann, M. L. Faccini-Turluer, Daniel Vignaud, G. Myatt, M. A. Parker, M. M. Mobayyen, D. B. Miller, B. Nellen, M. Aderholz, M. Talebzadeh, Jelena Krstic, E. F. Clayton, S. Sewell, Keith W. J. Barnham, A. Vayaki, W. Wittek, J. Guy, E. Simopoulou, H. Grässler, W. Venus, K. Hultquist, H. Wachsmuth, Amanda Cooper-Sarkar, and P. O. Hulth

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Muon, Meson, Nuclear physics, Pair production, Tau neutrino, D meson, High Energy Physics::Experiment, Neutrino, Neutrino oscillation, Particle Physics - Experiment, Lepton
Abstract

A novel and efficient kinematic method is used to estimate the number of ν τ charged current interactions with E ν > 20 GeV in the BEBC beam dump experiment. The result, −14±12 ν τ events, is consistent with zero. The ratio of D s to D meson production in 400 GeV proton interactions in copper is estimated to be below 0.65 at 90% c.l. The oscillation probability P ( ν e → ν τ ) averaged over the electron-(anti)neutrino spectrum is found to be below 18%. The hypothesis that ν e and ν τ are identical is excluded by about 6 standard deviations. A remarkable event is described: it contains a muon, a high p T photon and a high p T hadron.

Published
1987

10. Transverse momentum of hadrons produced in ν and interactions on an isoscalar target in BEBC

Author

Christoph Geich-Gimbel, A. Vayaki, H. Saarikko, M. Bloch, M. M. Mobayyen, Luc Pape, I. Butterworth, W. G. Scott, Daniel Vignaud, K. J. Powell, F.J. Hasert, M.E. Mermikides, A. Grant, Keith W. J. Barnham, J. Morfin, H. Grässler, D. B. Miller, D. Radojicic, O. Skjeggestad, P. Fritze, H. Deden, E. Simopoulou, Reinhard W. Schulte, J. L. Lloyd, P. Grossmann, K. Böckmann, D.C. Cundy, P. Bosetti, T. P. Kokott, J. R. Batley, Donald H. Perkins, J.S. Chima, B. Nellen, P. B. Renton, C. Penfold, B. Saitta, T. Bolognese, E. F. Clayton, B. Tallini, J. Velasco, R. H. Giles, P. O. Hulth, R. Pech, and G. Myatt

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Antiparticle, Muon, Isoscalar, Nuclear Theory, Hadron, Elementary particle, Fermion, Nuclear physics, Antimatter, High Energy Physics::Experiment, Nuclear Experiment, Lepton
Abstract

The average transverse momentum squared, 〈p⊥2〉, of hadrons is studied as a function of W2 and of Q2 for ν and ν interactions on an isoscalar target. An increase of 〈p⊥2〉 with W2 is observed for the hadrons emitted forward in the hadronic c.m.s. The p⊥ dependence of the fragmentation function is found to factorise from the structure function at fixed W, but does not factorise at fixed Q2. Unlike the case of forward-going particles, the 〈p⊥2〉 of hadrons going backward in the c.m.s. shows no strong dependence on W2.

Published
1981

11. Search for heavy neutrino decays in the BEBC beam dump experiment

Author

W. Wittek, B. Wünsch, D. R. O. Morrison, M. M. Mobayyen, B. Nellen, M. L. Faccini-Turluer, K. Hultqvist, U. Idschok, P. Bostock, H. Grässler, Amanda Cooper-Sarkar, M. Talebzadeh, J. Guy, Stephen Haywood, H. Kreutzmann, W. Venus, J. Krstic, H. Wachsmuth, H. Klein, M. A. Parker, P. O. Hulth, Daniel Vignaud, Subir Sarkar, and Keith W. J. Barnham

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Meson, High Energy Physics::Phenomenology, law.invention, Massless particle, Nuclear physics, law, D meson, High Energy Physics::Experiment, Invariant mass, Beam dump, Neutrino, Nuclear Experiment, Neutrino oscillation, Particle Physics - Experiment, Lepton
Abstract

New limits on lepton mixing parameters are derived from a search for decays of heavy neutrinos in a proton beam dump experiment. The limits | U oi | 2 , | U e i | 2 −6 −10 −7 are obtained for neutrino mass eigenstates v i of mass between 0.5 and 1.75 GeV, which can be produced through mixing in charmed D meson decays. This is the first such limit on | U o i | 2 for neutrino masses greater than 0.5 GeV. For the mass eigenstate v 3 in particular, we obtain the limits | U o 3 | 2 −7 −10 −8 , | U e 3 | 2 −9 −10 −10 for the mass range 150–190 MeV, assuming the v 3 to be produced directly in charmed F meson decays.

Published
1985

12. Multiplicities of secondary hadrons produced in vp and charged current interactions

Author

G. Myatt, Reinhard W. Schulte, K. L. Wernhard, D. Lanske, J.S. Chima, B. Nellen, G. T. Jones, M. Aderholz, D. R. O. Morrison, A. Grant, G. Corrigan, Peter Schmid, W. Gebel, S. W. O'Neale, H. Wachsmuth, K. Böckmann, Christoph Geich-Gimbel, N. Schmitz, W. Wittek, H. Grässler, R. Settles, R. P. Middleton, M. M. Mobayyen, O. Villalobos-Baillie, B. Saitta, L. Deck, H. Klein, M. Talebzadeh, Jon-Paul R. Wells, and D. Radojicic

Subjects
Physics, Quark, Nuclear and High Energy Physics, Particle physics, Muon, Meson, High Energy Physics::Lattice, Nuclear Theory, High Energy Physics::Phenomenology, Diquark, Nuclear physics, Pion, High Energy Physics::Experiment, Neutrino, Nuclear Experiment, Charged current, Lepton
Abstract

In an experiment with the hydrogen bubble chamber BEBC at CERN multiplicities of hadrons produced in νp and vp interactions have been investigated. Results are presented on the multiplicities of charged hadrons and neutral pions, forward and backward multiplicities of charged hadrons and correlations between forward and backward multiplicities. Comparisons are made with hadronic reactions and e+e− annihilation. In the framework of the quark-parton model the data imply similar charged multiplicities for the fragments of a u- and a d-quark, and a larger multiplicities for the fragments of a uu- than for a ud-diquark. The correlation data suggest independent fragmentation of the quark and diquark for hadronic masses above ∼ 7 GeV and local charge compensation within an event.

Published
1983

13. A test of ν stability using a 200 GeV narrow-band neutrino beam at BEBC

Author

B. Wünsch, D. B. Miller, B. Tallini, J. Velasco, Daniel Vignaud, A. Petrides, M. M. Mobayyen, K. Böckmann, C. Albajar, K. Schultze, J. L. Lloyd, W. Glimpf, D. Radojicic, P. Bosetti, E. F. Clayton, O. Skjeggestad, H. Grässler, Donald H. Perkins, B. Saitta, M. Bloch, B. Nellen, H. Wachsmuth, Thomas Kokott, Keith W. J. Barnham, Ch. Peyrou, M.E. Mermikides, G. Myatt, P. B. Renton, H. Saarikko, T. Bolognese, P. O. Hulth, D. Kirch, K. J. Powell, Jon-Paul R. Wells, D.C. Cundy, Luc Pape, I. Butterworth, A. Vayaki, J. S. Chima, M. Poppe, A. Grant, and H. Deden

Subjects
Nuclear physics, Physics, Nuclear and High Energy Physics, Particle physics, Narrow band, Neutrino beam, Stability (probability), Particle Physics - Experiment, Mixing (physics), Beam (structure)
Abstract

ν e induced events obtained in a 200 GeV narrow-band beam have been studied and compared to the number expected from K e3 + decay. Agreement is found between the expected and observed numbers allowing limits to be set on ν e → ν x mixing.

Published
1981

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