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49 results on '"M. M. Mobayyen"'

1. Spin alignment of ρ0 mesons produced in antineutrino and neutrino neon charged-current interactions

Author

P. O. Hulth, D. Bertrand, Amanda Cooper-Sarkar, V. Brisson, M. M. Mobayyen, D. R. O. Morrison, Mikael Berggren, M. Adeholz, H. Wachsmuth, P. Kasper, D. B. Miller, N. Schmitz, W. Venus, Jon-Paul R. Wells, C. Vallée, P. Petiau, W. Burkot, O. Erriquez, R. P. Middleton, E. F. Clayton, A. Vayaki, W. Wittek, J. P. Baton, P. J. Fitch, M.T. Fogli-Muciaccia, K. Varvell, M. Calicchio, Pierre Marage, Marc Neveu, G. T. Jones, T. Coghen, Jean Sacton, S. W. O'Neale, J. Guy, R. A. Sansum, E. Simopoulou, F. W. Bullock, P. P. Allport, H. Klein, and M. A. Parker

Subjects
Physics, Nuclear physics, Nuclear and High Energy Physics, Particle physics, Neon, Meson, Fragmentation (mass spectrometry), chemistry, Bubble chamber, chemistry.chemical_element, Neutrino, Charged current
Abstract

In a bubble chamber experiment with BEBC the spin alignment parameter η= 1 2 (2ϱ 00 − ϱ 11 − ϱ −1−1 ) is measured for ϱ0 mesons produced in deep inelastic charged-current antineutrino and neutrono interactions on neon. In the current fragmentation region η is found to be η v =0.48±0.27 ( stat. )±0.15 ( syst. ) for v Ne and ηv=0.12±0.20 (stat.)±0.10 (syst.) for vNe interactions

Published
2016

2. Determination of the parton distributions and structure functions of the proton from neutrino and antineutrino reactions on hydrogen and deuterium

Author

M. M. Mobayyen, W. Wittek, S. Wainstein, H. Wachsmuth, W. Venus, B. W. Kennedy, Norbert Schmitz, G. T. Jones, D. Hantke, U. F. Katz, J. Kern, M. Aderholz, S. Burke, H. P. Borner, A. M. Cooper-Sarkar, R. W. L. Jones, J. Guy, D. R. O. Morrison, H. Klein, F. W. Bullock, G. Myatt, and D. B. Miller

Subjects
Quantum chromodynamics, Physics, Particle physics, Physics and Astronomy (miscellaneous), Proton, Scattering, High Energy Physics::Phenomenology, Parton, Lambda, Nuclear physics, Momentum, Deuterium, High Energy Physics::Experiment, Neutrino, Nuclear Experiment, Engineering (miscellaneous)
Abstract

This analysis is based on data from neutrino and antineutrino scattering on hydrogen and deuterium, obtained with BEBC in the (anti) neutrino wideband beam of the CERN SPS. The parton momentum distributions in the proton and the proton structure functions are determined in the range 0.01

Published
1994

3. Determination of the ratior v =d v u v of the valence quark distributions in the proton from neutrino and antineutrino reactions on hydrogen and deuterium

Author

W. Wittek, R. W. L. Jones, S. Wainstein, M. M. Mobayyen, H. Wachsmuth, B. W. Kennedy, D. R. O. Morrison, S. Burke, G. Myatt, F. W. Bullock, W. Venus, G. T. Jones, U. F. Katz, J. Kern, D. B. Miller, M. Aderholz, J. Guy, H. P. Borner, H. Klein, A. M. Cooper-Sarkar, D. Hantke, and N. Schmitz

Subjects
Nuclear physics, Physics, Quantum chromodynamics, Quark, Particle physics, Valence (chemistry), Physics and Astronomy (miscellaneous), Deuterium, Elementary particle, Parton, Neutrino, Engineering (miscellaneous), Charged current
Abstract

Based on a QCD analysis of the parton momentum distributions in the proton, the ratior v =d v /u v of thed andu valence quark distributions is determined as function ofx in the range 0.01

Published
1994

4. Diffractive production of ρ-mesons and of ρπ-systems by neutrinos and antineutrinos on protons

Author

D. R. O. Morrison, U. F. Katz, M. M. Mobayyen, D. B. Miller, F. W. Bullock, B. W. Kennedy, R. W. L. Jones, S. Burke, W. Wittek, M. Aderholz, H. P. Borner, S. Wainstein, D. Hantke, G. T. Jones, G. Myatt, J. Kern, and N. Schmitz

Subjects
Nuclear physics, Physics, Range (particle radiation), Physics and Astronomy (miscellaneous), Meson, Production (computer science), Neutrino, Engineering (miscellaneous)
Abstract

Evidence is presented for diffractive production of ρ-mesons and of ρπ-systems invp and $$\bar \nu p$$ chargedcurrent interactions. In the (anti-)neutrino energy range 10 GeV

Published
1993

5. Neutral strange particle production in neutrino and antineutrino charged current interactions on protons

Author

W. Wittek, S. Burke, H. Wachsmuth, H. P. Borner, D. R. O. Morrison, Peter Schmid, F. W. Bullock, B. W. Kennedy, D. Radojicic, O. Villalobos-Baillie, G. T. Jones, S. W. O'Neale, M. M. Mobayyen, Norbert Schmitz, G. Myatt, H. Klein, D. Hantke, J. Kern, U. F. Katz, R. W. L. Jones, M. Aderholz, S. Wainstein, and D. B. Miller

Subjects
Physics, Particle physics, Strange quark, Physics and Astronomy (miscellaneous), Octet, High Energy Physics::Phenomenology, Nuclear Theory, Hadron, Lambda, Baryon, Nuclear physics, Neutrino, Nuclear Experiment, Engineering (miscellaneous), Particle Physics - Experiment, Charged current, Bar (unit)
Abstract

The production of the neutral strange particlesK 0, Λ and $$\bar \Lambda $$ invp and $$\bar vp$$ charged current interactions is studied in an experiment with the Big European Bubble Chamber. Mean multiplicities are measured as a function of the event variablesE v,W 2 andQ 2 and of the hadron variablesx F,z andp T 2 .K *± (892) and∑ *± (1385) signals are observed, whereas there is no evidence for∑ *- (1385) production invp scattering. Forward, backward and total mean multiplicities are found to compare well with the predictions of an empirical model for deep-inelastic reactions in the case of the strange mesonsK 0 andK *± (892) but less so for the strange baryons Λ, $$\bar \Lambda $$ and∑ *± (1385). The strange baryon multiplicities are used to obtain the decuplet to octet baryon production ratio and to assess the probabilities of auu orud system to break up.

Published
1993

6. 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

7. Multiplicity distributions of charged hadrons invp and charged current interactions

Author

H. P. Borner, S. Wainstein, D. Hantke, N. Schmitz, B. W. Kennedy, D. R. O. Morrison, W. Wittek, U. F. Katz, R. W. L. Jones, D. Radojicic, M. M. Mobayyen, G. Myatt, M. Aderholz, G. T. Jones, J. Kern, and S. Burke

Subjects
Physics, Particle physics, Physics and Astronomy (miscellaneous), Hadron, Multiplicity (mathematics), Function (mathematics), Nuclear physics, Log-normal distribution, Bubble chamber, High Energy Physics::Experiment, Invariant (mathematics), Engineering (miscellaneous), Scaling, Charged current
Abstract

Using data onvp and $$\bar vp$$ charged current interactions from a bubble chamber experiment with BEBC at CERN, the multiplicity distributions of charged hadrons are investigated. The analysis is based on ∼20000 events with incidentv and ∼10000 events with incident $$\bar v$$ . The invariant massW of the total hadronic system ranges from 3 GeV to ∼14 GeV. The experimental multiplicity distributions are fitted by the binomial function (for different intervals ofW and in different intervals of the rapidityy), by the Levy function and the lognormal function. All three parametrizations give acceptable values forX 2. For fixedW, forward and backward multiplicities are found to be uncorrelated. The normalized moments of the charged multiplicity distributions are measured as a function ofW. They show a violation of KNO scaling.

Published
1992

8. Coherent production ofa 1 ? mesons and (??)? systems by antineutrinos on neon

Author

P. P. Allport, E. F. Clayton, O. Erriquez, E. Simopoulou, M. Aderholz, A. Vayaki, T. Coghen, W. Wittek, Stephane Willocq, Amanda Cooper-Sarkar, Pierre Marage, H. Wachsmuth, N. Armenise, R. A. Sansum, M. Neveu, J. Guy, D. R. O. Morrison, W. Venus, W. Burkot, Jean Sacton, Mikael Berggren, E. Matsinos, K. Varvell, P. O. Hulth, M. M. Mobayyen, M. Calicchio, V.S. Burtovoy, S. W. O'Neale, J. P. Baton, S. Wainstein, and G. T. Jones

Subjects
Physics, Particle physics, Large Hadron Collider, Physics and Astronomy (miscellaneous), Meson, Nuclear Theory, chemistry.chemical_element, Elementary particle, Nuclear physics, Neon, chemistry, Bubble chamber, High Energy Physics::Experiment, Quantum field theory, Nuclear Experiment, Engineering (miscellaneous), Charged current, Beam (structure)
Abstract

The coherent production of 3π systems by charged current antineutrino interactions on neon nuclei is studied in the bubble chamber BEBC exposed to the CERN SPS wide band beam. The coherent signal is attributed mainly to (ρπ) production, where the (ρπ) system is either non-resonant or comes from the decay of a1 mesons. The kinematical variables and the total cross section are compared with the predictions of the meson dominance model. © 1991 Springer-Verlag.

Published
1991

9. Inclusivef 2 (1270) meson production in ?p and $$\bar vp$$ charged current interactions

Author

G. Myatt, J. Kern, W. Wittek, S. Burke, S. Wainstein, H. P. Borner, N. Schmitz, E. Hoffmann, R. W. L. Jones, D. Hantke, D. R. O. Morrison, G. T. Jones, U. F. Katz, M. Aderholz, D. Radojicic, B. W. Kennedy, and M. M. Mobayyen

Subjects
Physics, Particle physics, Large Hadron Collider, Physics and Astronomy (miscellaneous), Hadron, Elementary particle, Multiplicity (mathematics), Particle acceleration, Nuclear physics, Bubble chamber, High Energy Physics::Experiment, Quantum field theory, Nuclear Experiment, Engineering (miscellaneous), Charged current
Abstract

Using data obtained with the bubble chamber BEBC at CERN, the inclusivef2 (1270) meson production invp and\(\bar vp\) charged current reactions is studied. It is found thatf2 production occurs mainly in events with a hadronic invariant massW≳7 GeV. In these events, the averagef2 multiplicity is about half the average ρO multiplicity, and thexF andpT2 distributions of thef2 agree in shape with those of the ρO. The predictions of a semi-empirical model (Wells model) are in accord with the measured multiplicities atW>7 GeV, whereas at lowerW the model predicts too largef2 multiplicities.

Published
1991

11. W 2 andQ 2 dependence of charged hadron and pion multiplicities invp and $$\bar vp$$ charged current interactionscharged current interactions

Author

S. Burke, H. P. Borner, R. W. L. Jones, W. Wittek, Phillip Allport, M. Aderholz, E. Hoffmann, D. Hantke, N. Schmitz, J. Kern, S. Wainstein, M. M. Mobayyen, F. W. Bullock, G. T. Jones, D. Radojicic, G. Myatt, D. R. O. Morrison, and U. F. Katz

Subjects
Nuclear physics, Physics, Particle physics, Pion, Large Hadron Collider, Physics and Astronomy (miscellaneous), Hadron, Bubble chamber, Multiplicity (mathematics), Engineering (miscellaneous), Charged current
Abstract

Using data onvp and\(\bar vp\) charged current interactions from a bubble chamber experiment with BEBC at CERN, the average multiplicities of charged hadrons and pions are determined as functions ofW2 andQ2. The analysis is based on ∼20000 events with incidentv and ∼10000 events with incident\(\bar v\). In addition to the known dependence of the average multiplicity onW2 a weak dependence onQ2 for fixed intervals ofW is observed. ForW>2 GeV andQ2>0.1 GeV2 the average multiplicity of charged hadrons is well described by〈n〉=a1+a2ln(W2/GeV2)+a3ln(Q2/GeV2) witha1=0.465±0.053,a2=1.211±0.021,a3=0.103±0.014 for thevp anda1=−0.372±0.073,a2=1.245±0.028,a3=0.093±0.015 for the\(\bar vp\) reaction.

Published
1990

12. A measurement of the holographic minimum-observable beam branching ratio in the fermilab 15-foot bubble chamber

Author

T. K. Chatterjee, M. D. Jones, J. Lys, H. H. Bingham, H. Foeth, E. Clayton, R. H. Milburn, A. Napier, Phillip Allport, S. Willocq, M. Lauko, E.L. Koller, Pierre Marage, R. J. Krawiec, Patrick A. Naylor, J.R. Campbell, E. A. De Wolf, L. Verluyten, W.B. Fretter, S. K. Badyal, H. Akbari, H. Bjelkhagen, R. J. Cence, R. A. Burnstein, G. T. Jones, M. Neveu, Devanand, V.K. Gupta, M. M. Mobayyen, J. M. Kohli, P.F. Jacques, R.J. Plano, P.J.W. Faulkner, D. B. Miller, W. Smart, P. E. Stamer, I. S. Mittra, J. P. Baton, J. Hawkins, G. P. Yost, G. Harigel, Sanjeev Singh Sambyal, K. Geissler, D. DeProspo, P. H. Kasper, G. Corrigan, W. Williams, Vincent Z. Peterson, D. Passmore, N. K. Rao, H.A. Rubin, D. R. O. Morrison, Madan M. Aggarwal, S. Sewell, J. Schneps, F. A. Harris, Jasvinder A. Singh, T. Kafka, E. B. Brucker, L. Voyvodic, N. Schmitz, Jean Sacton, M.W. Peters, Ch. Coutures, M. Kalelkar, K. Varvell, M. Barth, R.L. Sekulin, S. Wainstein, J. Hanlon, J. Moreels, H.C. Ballagh, R. Naon, M. A. Jabiol, G. Myatt, M. Aderholz, and H. Wachsmuth

Subjects
Physics, Nuclear and High Energy Physics, Physics::Instrumentation and Detectors, business.industry, Bubble, Holography, Conical surface, law.invention, Optics, law, Reference beam, Bubble chamber, Fermilab, Neutrino, Detectors and Experimental Techniques, business, Instrumentation, Beam (structure)
Abstract

Holography has been used successfully in combination with conventional optics for the first time in a large cryogenic bubble chamber, the 15-Foot Bubble Chamber at Fermilab, during a physics run. The innovative system combined the reference beam with the object beam, illuminating a conical volume of $\sim 1.4$~m$^3$. Bubble tracks from neutrino interactions with a width of $\sim 120\;\mu$m have been recorded with good contrast. The ratio of intensities of the object light to the reference light striking the film is called the Beam Branching Ratio. We obtained in our experiment an exceedingly small minimum-observable ratio of $(0.54 \pm 0.21) \times 10^{-7}$. The technology has the potential for a wide range of applications.

Published
1999

13. Neutral strange particle production in neutrino and antineutrino charged-current interactions on neon

Author

D. DeProspo, M. Kalelkar, M. Aderholz, H. Akbari, P. P. Allport, V. V. Ammosov, A. Andryakov, A. Asratyan, S. K. Badyal, H. C. Ballagh, J.-P. Baton, M. Barth, H. H. Bingham, E. B. Brucker, R. A. Burnstein, R. J. Cence, T. K. Chatterjee, E. F. Clayton, G. Corrigan, C. Coutures, null Devanand, E. De Wolf, P. Ermolov, I. Erofeeva, P. J. W. Faulkner, H. Foeth, W. B. Fretter, G. Gapienko, V. K. Gupta, J. Hanlon, G. Harigel, F. A. Harris, A. Ivanilov, M. Jabiol, P. Jacques, V. Jain, G. T. Jones, M. D. Jones, T. Kafka, V. Kaftanov, P. Kasper, V. Kobrin, J. M. Kohli, E. L. Koller, V. Korablev, M. Kubantsev, M. Lauko, O. Lukina, J. E. Lys, S. Lyutov, P. Marage, R. H. Milburn, I. S. Mittra, M. M. Mobayyen, J. Moreels, D. R. O. Morrison, V. Moskalev, V. Murzin, G. Myatt, P. Nailor, R. Naon, A. Napier, M. Neveu, D. Passmore, M. W. Peters, V. Z. Peterson, R. Plano, N. K. Rao, H. A. Rubin, S. Ryasakov, J. Sacton, S. S. Sambyal, N. Schmitz, J. Schneps, J. B. Singh, S. Singh, S. Sivoklokov, W. Smart, L. Smirnova, P. Stamer, K. E. Varvell, L. Verluyten, H. Wachsmuth, S. Wainstein, S. Willocq, and G. P. Yost

Subjects
Physics, Particle physics, Strange quark, Meson, High Energy Physics::Phenomenology, Nuclear Theory, Hadron, Hyperon, Elementary particle, Lambda baryon, Baryon, Nuclear physics, Antimatter, Nuclear Experiment, Particle Physics - Experiment
Abstract

The production of the neutral strange particlesK0, Λ and\(\bar \Lambda \) invp and\(\bar vp\) charged current interactions is studied in an experiment with the Big European Bubble Chamber. Mean multiplicities are measured as a function of the event variablesEv,W2 andQ2 and of the hadron variablesxF,z andp T 2 .K*± (892) and∑*± (1385) signals are observed, whereas there is no evidence for∑*- (1385) production invp scattering. Forward, backward and total mean multiplicities are found to compare well with the predictions of an empirical model for deep-inelastic reactions in the case of the strange mesonsK0 andK*± (892) but less so for the strange baryons Λ,\(\bar \Lambda \) and∑*± (1385). The strange baryon multiplicities are used to obtain the decuplet to octet baryon production ratio and to assess the probabilities of auu orud system to break up.

Published
1995

14. Coherent production of single pions and ρ mesons in charged-current interactions of neutrinos and antineutrinos on neon nuclei at the Fermilab Tevatron

Author

S. K. Badyal, S. Singh, E. L. Koller, H. Foeth, Devanand, J. B. Singh, R. Naon, J. Lys, E. A. De Wolf, I. S. Mittra, H. Wachsmuth, R. Burnstein, G. Corrigan, D. Passmore, P. J. W. Faulkner, N. K. Rao, G. Harigel, M. Kalelkar, E. F. Clayton, W. B. Fretter, M. Lauko, M. D. Jones, M. Aderholz, A. Napier, Kevin Varvell, M. Barth, V. Jain, Michael Peters, G. T. Jones, S. Wainstein, L. Verluyten, R. J. Krawiec, Pierre Marage, T. K. Chatterjee, H. C. Ballagh, P.F. Jacques, H. H. Bingham, Sanjeev Singh Sambyal, D. R. O. Morrison, E. B. Brucker, H. Akbari, N. Schmitz, T. Kafka, J. M. Kohli, D. De Prospo, G. P. Yost, J. Schneps, M. M. Mobayyen, Richard H. Milburn, V. K. Gupta, Phillip Allport, H. A. Rubin, Vincent Z. Peterson, Wesley M. Smart, S. Willocq, Jean Sacton, R. J. Cence, R.J. Plano, F. A. Harris, G. Myatt, J. Hanlon, P. E. Stamer, J. Moreels, and P. Nailor

Subjects
Physics, Nuclear physics, Particle physics, Rho meson, Pion, Meson, Hadron, High Energy Physics::Experiment, Elementary particle, Vector meson dominance, Neutrino, Particle Physics - Experiment, Boson
Abstract

The coherent production of [pi] and [rho] mesons in [nu][sub [mu]]([bar [nu]][sub [mu]])--neon charged-current interactions has been studied using the Fermilab 15-foot bubble chamber filled with a heavy Ne-H[sub 2] mix and exposed to the Teva- tron quadrupole triplet (anti)neutrino beam. The [nu][sub [mu]] ([bar [nu]][sub [mu]]) beam had an average energy of 80 GeV (70 GeV). From a sample corresponding to approximately 28 000 charged-current interactions, net signals of (53[plus minus]9) [mu][sup [plus minus]][pi][sup [minus plus]] coherent events and (19[plus minus]7) [mu][sup [plus minus]][pi][sup [minus plus]][pi][sup 0] coherent events are extracted. For [ital E][gt]10 GeV, the coherent pion production cross section is determined to be (3.2[plus minus]0.7)[times]10[sup [minus]38] cm[sup 2] per neon nucleus whereas the coherent [rho] production cross section is (2.1[plus minus]0.8)[times]10[sup [minus]38] cm[sup 2] per neon nucleus. These cross sections and the kinematical characteristics of the coherent events at [vert bar][ital t][vert bar][lt]0.1 GeV[sup 2] are found to be in general agreement with the predictions of a model based on the hadron dominance and, in the pion case, on the partially conserved axial-vector current hypothesis. Also discussed is the coherent production of systems consisting of three pions.

Published
1993

15. Diffractive production of charmed strange mesons by neutrinos and antineutrinos

Author

V. A. Gapienko, U. F. Katz, G. T. Jones, A.E. Asratyan, V. A. Korotkov, W. Wittek, Pierre Marage, W. Burkot, V. V. Ammosov, D. Hantke, W. Venus, O. Erriquez, V. S. Kaftanov, Jean Sacton, M. A. Kubantsev, V.G. Zaetz, J. Guy, T. Coghen, E. F. Clayton, J. Kern, D. R. O. Morrison, Norbert Schmitz, M. Neveu, M. M. Mobayyen, S.P. Krutchinin, G. S. Gapienko, K. Varvell, M. Aderholz, and D. B. Miller

Subjects
Physics, Particle physics, Physics and Astronomy (miscellaneous), Meson, Branching fraction, Isoscalar, High Energy Physics::Phenomenology, Nuclear Theory, chemistry.chemical_element, Astrophysics::Cosmology and Extragalactic Astrophysics, Nuclear physics, Neon, chemistry, Deuterium, High Energy Physics::Experiment, Neutrino, Nuclear Experiment, Nucleon, Engineering (miscellaneous), Charged current, Particle Physics - Experiment
Abstract

The diffractive production of charmed strangeD s * and possiblyD s mesons by neutrinos and antineutrinos on nucleons in hydrogen, deuterium and neon targets is observed. The slope parameter of thet distribution is 3.3±0.8 (GeV)−2. The production rate per charged current neutrino interaction with an isoscalar target times the D s + →φτ+ branching fraction is (1.03±0.27)×10−4.

Published
1992

16. Study of high-energy neutrino neutral-current interactions

Author

M. D. Jones, G. Corrigan, E. A. De Wolf, M. Lauko, H. Akbari, D. B. Miller, P. E. Stamer, Vipul Jain, R. J. Krawiec, M. A. Jabiol, Jean Sacton, J. M. Kohli, V. K. Gupta, F. A. Harris, Phillip Allport, A. Napier, S. Willocq, P. Nailor, T. Kafka, R. J. Cence, L. Verluyten, R.J. Plano, M. M. Mobayyen, H. A. Rubin, Vincent Z. Peterson, Sanjeev Singh Sambyal, T. K. Chatterjee, H. H. Bingham, J. Moreels, Wesley M. Smart, Michael Peters, J. P. Baton, G. P. Yost, M. Kalelkar, H. Wachsmuth, E. B. Brucker, M. Neveu, Madan M. Aggarwal, Richard H. Milburn, Kevin Varvell, S. K. Badyal, E. F. Clayton, D. Passmore, C. Coutures, N. K. Rao, J. Lys, G. T. Jones, N. Schmitz, J. Hanlon, W.B. Fretter, P.F. Jacques, M. Aderholz, P.J.W. Faulkner, D. R. O. Morrison, M. Barth, S. Wainstein, P. H. Kasper, R. Naon, G. Myatt, H. Foeth, J.R. Campbell, Devanand, H.C. Ballagh, D. DeProspo, E. L. Koller, J. B. Singh, I. S. Mittra, G. Harigel, R. A. Burnstein, Pierre Marage, and J. Schneps

Subjects
Nuclear physics, Physics, Baryon, Particle physics, Muon, Meson, Hadron, Production (computer science), Lambda baryon, Energy (signal processing), Particle Physics - Experiment, Lepton
Abstract

From an exposure of the Fermilab 15-foot bubble chamber to the Tevatron quadrupole triplet neutrino beam, we have determined the ratio of neutral-current (NC) to charged-current (CC) interactions to be 0.288{plus minus}0.032 for events with visible hadron momentum above 10 GeV/{ital c}. The mean {nu}({bar {nu}}) event energy is 150 (110) GeV, which is higher than that for any previous beam. This result agrees with those from previous experiments at lower energies. The NC/CC ratio is derived for a combined sample of {nu} and {bar {nu}} events. A value of 0.274{plus minus}0.038 is obtained for the dominant {nu} component assuming {bar {nu}} NC/CC=0.39{plus minus}0.08. For events with visible hadron momentum above 25 GeV/{ital c}, where the neutral hadron contamination remaining in the NC sample is assumed to be negligible, the combined NC/CC is 0.323{plus minus}0.025 and the {ital K}{sup 0} production rates are 0.375{plus minus}0.064 per CC and 0.322{plus minus}0.073 per NC event. The corresponding {Lambda} rates are 0.161{plus minus}0.030 per CC and 0.113{plus minus}0.030 per NC event. The {ital K}{sup 0} and {Lambda} distributions of the fractional hadron energy variable {ital z} in NC events are consistent with those in CC events.

Published
1992

17. Dimuon production by neutrinos in the Fermilab 15-ft bubble chamber at the Tevatron

Author

V. Jain, F. A. Harris, M. Aderholz, M. M. Aggarwal, H. Akbari, P. P. Allport, P. V. K. S. Baba, S. K. Badyal, M. Barth, J. P. Baton, H. H. Bingham, E. B. Brucker, R. A. Burnstein, J. R. Campbell, R. J. Cence, T. K. Chatterjee, E. F. Clayton, G. Corrigan, C. Coutures, D. Deprospo, null Devanand, E. De Wolf, P. J. W. Faulkner, W. B. Fretter, V. K. Gupta, J. Guy, J. Hanlon, G. G. Harigel, M. A. Jabiol, P. Jacques, G. T. Jones, M. D. Jones, T. Kafka, M. Kalelkar, P. Kasper, G. L. Kaul, M. Kaur, J. M. Kohli, E. L. Koller, R. J. Krawiec, M. Lauko, J. Lys, P. Marage, R. H. Milburn, D. B. Miller, I. S. Mittra, M. M. Mobayyen, J. Moreels, D. R. O. Morrison, G. Myatt, P. Nailor, R. Naon, A. Napier, M. Neveu, D. Passmore, M. W. Peters, V. Z. Peterson, R. Plano, N. K. Rao, H. A. Rubin, J. Sacton, B. Saitta, P. Schmid, N. Schmitz, J. Schneps, R. Sekulin, S. Sewell, J. B. Singh, P. M. Sood, W. Smart, P. Stamer, K. E. Varvell, W. Venus, L. Verluyten, L. Voyvodic, H. Wachsmuth, S. Wainstein, S. Willocq, and G. P. Yost

Subjects
Nuclear physics, Physics, Particle physics, Muon, Pair production, Elementary particle, Production (computer science), Neutrino, Energy (signal processing), Spectral line, Charged current, Particle Physics - Experiment
Abstract

The Fermilab 15-ft bubble chamber has been exposed to a quadrupole triplet neutrino beam produced at the Tevatron. The ratio of {nu} to {bar {nu}} in the beam is approximately 2.5. The mean event energy for {nu}-induced charged-current events is 150 GeV, and for {bar {nu}}-induced charged-current events it is 110 GeV. A total of 64 dimuon candidates (1 {mu}{sup +}{mu}{sup +}, 52 {mu}{sup {minus}}{mu}{sup +} and {mu}{sup +}{mu}{sup {minus}}, and 11 {mu}{sup {minus}}{mu}{sup {minus}}) is observed in the data sample of approximately 13 300 charged-current events. The number and properties of the {mu}{sup {minus}}{mu}{sup {minus}} and {mu}{sup +}{mu}{sup +} candidates are consistent with their being produced by background processes, the important sources being {pi} and {ital K} decay and punchthrough. The 90%-C.L. upper limit for {mu}{sup {minus}}{mu}{sup {minus}}/{mu}{sup {minus}} for muon momenta above 4 GeV/{ital c} is 1.2{times}10{sup {minus}3}, and for momenta above 9 GeV/{ital c} this limit is 1.1{times}10{sup {minus}3}. The opposite-sign-dimuon--to--single-muon ratio is (0.62{plus minus}0.13)% for muon momenta above 4 GeV/{ital c}. There are eight neutral strange particles in the opposite-sign sample, leading to a rate per dimuon event of 0.65{plus minus}0.29. The opposite-sign-dimuon sample is consistent with the hypothesis of charm production and decay.

Published
1990

18. Study of transverse momenta of charged hadrons produced in νp and $$\bar vp$$ charged current interactions

Author

O. Villalobos-Baillie, W. Wittek, J. Mittendorfer, H. Wachsmuth, B. W. Kennedy, D. Radojicic, H. Klein, M. L. Retter, D. R. O. Morrison, M. Aderholz, Peter Schmid, L. Deck, A. M. Cooper, M. M. Mobayyen, R. P. Middleton, N. Schmitz, G. T. Jones, S. W. O'Neale, G. Corrigan, A. Grant, F. Hamisi, G. Myatt, and Anthony J. Parker

Subjects
Quark, Physics, Quantum chromodynamics, Particle physics, Physics and Astronomy (miscellaneous), Proton, High Energy Physics::Lattice, High Energy Physics::Phenomenology, Nuclear Theory, Hadron, Gluon, Nuclear physics, Pion, High Energy Physics::Experiment, Neutrino, Nuclear Experiment, Engineering (miscellaneous), Charged current
Abstract

Data from a neutrino and antineutrino hydrogen experiment with BEBC are used to investigate transverse properties of the produced charged hadrons. Measurements are presented on average transverse momenta of charged pions as functions of Feynman-x and the hadronic mass, on the transverse momentum flow within an event and on jet-related quantities. The main features of the data are well described by the LUND model. The data favour a version of the model in which soft gluon effects are included and the primordial transverse momentum of the quarks in the proton is small. Effects from 1st order QCD (hard gluon emission) are negligible.

Published
1984

19. TheK 0/π- ratio and strangeness supression inv p and $$\bar vp$$ charged current interactions

Author

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

Subjects
Physics, Particle physics, Physics and Astronomy (miscellaneous), Model prediction, Nuclear Theory, Elementary particle, Strangeness, Nuclear physics, Pion, High Energy Physics::Experiment, Quantum field theory, Nuclear Experiment, Engineering (miscellaneous), Charged current
Abstract

Neutral kaon to negative pion production ratios fromvp and\(\bar vp\) charged current interactions in BEBC are presented and compared with LUND fragmentation model predictions. Good agreement is obtained with a strangeness suppression factor λ=0.203±0.014(stat)±0.010(sys). No evidence is seen for an energy dependence of λ in our kinematic region.

Published
1985

20. Experimental test of the PCAC-hypothesis in charged current neutrino and antineutrino interactions on protons

Author

P. P. Allport, D. Radojicic, H. Klein, D. R. O. Morrison, Peter Schmid, W. Wittek, B. W. Kennedy, S. Wainstein, M. M. Mobayyen, R. W. L. Jones, D. B. Miller, E. Hoffmann, U. F. Katz, F. W. Bullock, G. T. Jones, G. Myatt, Norbert Schmitz, Steve O'Neale, M. Aderholz, S. Burke, J. Kern, and H. Wachsmuth

Subjects
Physics, Particle physics, Large Hadron Collider, Physics and Astronomy (miscellaneous), Scattering, Energy transfer, High Energy Physics::Phenomenology, Vector meson dominance, Nuclear physics, Bubble chamber, High Energy Physics::Experiment, Neutrino, Engineering (miscellaneous), Particle Physics - Experiment, Charged current
Abstract

Data obtained with the bubble chamber BEBC at CERN are used for the first significant test of Adler's prediction for the neutrino and antineutrino-proton scattering cross sections at vanishing four-momentum transfer squaredQ2. An Extended Vector Meson Dominance Model (EVDM) is applied to extrapolate Adler's prediction to experimentally accessible values ofQ2. The data show good agreement with Adler's prediction forQ2→0 thus confirming the PCAC hypothesis in the kinematical region of high leptonic energy transfer ν>2 GeV. The good agreement of the data with the theoretical predictions also at higherQ2, where the EVDM terms are dominant, also supports this model. However, an EVDM calculation without PCAC is clearly ruled out by the data.

Published
1987

21. Production ofρ +, −, 0 (770),η(550), ω(783) andf 2(1270) mesons in $$\bar v$$ neon and ν neon charged current interactions

Author

Robin Middleton, Amanda Cooper-Sarkar, Marco Calicchio, Pierre Marage, M. M. Mobayyen, Phillip Allport, R. A. Sansum, K. Varvell, D. R. O. Morrison, J. Guy, W. Venus, S. W. O'Neale, E. Matsinos, Onofrio Erriquez, E. F. Clayton, Magella Neveu, U. F. Katz, J. Kern, Norbert Schmitz, A. Vayaki, W. Wittek, James D. Wells, D. Hantke, H. Wachsmuth, M. Aderholz, Monique Parker, E. Simopoulou, Mikael Berggren, T. Coghen, J. P. Baton, Ethan Hoffmann, G. T. Jones, and Stephane Willocq

Subjects
Physics, Muon, Physics and Astronomy (miscellaneous), Meson, Hadron, chemistry.chemical_element, Nuclear physics, Neon, Pair production, Pion, chemistry, High Energy Physics::Experiment, Atomic physics, Engineering (miscellaneous), Charged current, Lepton
Abstract

The production of the meson resonances ϱ(770) (all three charge states), η(550), ω(783) andf 2(1270) in $$\bar v$$ Ne and ν Ne charged current interactions is investigated in a bubble chamber experiment with BEBC at CERN. Except for thef 2, the main features of resonance production are reasonably well described by the Lund model, although the average resonance multiplicities are overestimated by the model by (67±30)%. The average multiplicities of all resonances, including thef 2, are well reproduced by a semiempirical model, whose parameters were determined from hadron interaction data.

Published
1989

22. Backward particle production in neutrino neon interactions

Author

M. A. Parker, G. W. Van Apeldoorn, A. Vayaki, W. Wittek, W. Venus, S. W. O'Neale, Pierre Marage, T. Coghen, G. T. Jones, R. A. Sansum, M. Calicchio, Amanda Cooper-Sarkar, N. Giannakopoulos, Jean Sacton, E. Simopoulou, Phillip Allport, M. Berggren, E. Matsinos, M. M. Mobayyen, O. Erriquez, D. R. O. Morrison, J. Guy, H. Wachsmuth, Norbert Schmitz, and K. Varvell

Subjects
Physics, Particle physics, Muon, Physics and Astronomy (miscellaneous), Proton, Nuclear Theory, chemistry.chemical_element, Elementary particle, Nuclear physics, Neon, Pion, chemistry, Physics::Accelerator Physics, Proton emission, Neutrino, Nuclear Experiment, Engineering (miscellaneous), Charged current, Nuclear Physics
Abstract

Backward proton and pion production is studied in ν and {Mathematical expression} charged current interactions in neon. The results are compared with other experiments and theory. The complete backward proton data is compatible with protons produced by reinteractions in the nucleus. However in events with only one proton, muon variables appear correlated to those for the backward proton, as expected by the two-nucleon correlation model. © 1989 Springer-Verlag.

Published
1989

23. Experimental test of the PCAC hypothesis in the reactionsv ? p? ?? p?+ and $$ \bar v_\mu p \to \mu ^ + p\pi ^ - $$ in the?(1232) region

Author

E. Hoffmann, D. Hantke, S. Wainstein, M. Aderholz, G. T. Jones, D. R. O. Morrison, Phillip Allport, N. Schmitz, U. F. Katz, S. W. O'Neale, R. W. L. Jones, F. W. Bullock, B. W. Kennedy, M. M. Mobayyen, J. Kern, W. Wittek, D. Radojicic, G. Myatt, S. Burke, and H. P. Borner

Subjects
Nuclear physics, Physics, Momentum, Particle physics, Pion, Physics and Astronomy (miscellaneous), Hadron, Form factor (quantum field theory), Resonance, Bubble chamber, Neutrino, Engineering (miscellaneous), Charged current
Abstract

Data on the reactionsv μ p→ μ− pπ+ and $$ \bar v_\mu p \to \mu ^ + p\pi ^ - $$ in the Δ(1232) region are presented and a test of the PCAC hypothesis, using a modified version of the Adler model, is performed. The analysis is based on 1081 events in the neutrino and on 180 events in the antineutrino reaction, obtained in a bubble chamber experiment with BEBC at CERN. The experimental cross-sections for an invariant hadronic massW10 GeV are determined to be (0.628±0.059)·10−38 cm2 for the neutrino and (0.168±0.023)·10−38 cm2 for the antineutrino reaction. TheQ 2 andW distributions, the density matrix elements of the Δ resonance, and moments of the pion angular distribution are discussed. The data are found to be in good agreement with the Adler model in theQ 2 region below 1 GeV2. A maximum likelihood fit for the axial massm A in the axial-vector form factor yields a value ofm A =1.31±0.12 GeV. At lowQ 2 the data confirm the PCAC hypothesis and the discrepancy, formerly observed between the experimental and theoretical cross-sections forv μ p→ μ− pπ+ at low momentum transfers (Q 2≲0.2 GeV2), is understood as being due to inadequate pion ‘off-mass-shell’ corrections.

Published
1989

24. 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

25. 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

26. 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

27. 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

28. 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

29. 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

30. A measurement of the proton structure functions from neutrino-hydrogen and antineutrino-hydrogen charged-current interactions

Author

W. Wittek, H. Wachsmuth, B. W. Kennedy, D. B. Miller, D. R. O. Morrison, Peter Schmid, S. W. O'Neale, E. Hoffmann, G. Corrigan, D. Hantke, R. W. L. Jones, S. Burke, S. J. Towers, Norbert Schmitz, M. Aderholz, J. Kern, D. Radojicic, U. F. Katz, F. Hamisi, P. N. Shotton, G. Myatt, G. T. Jones, S. Wainstein, M. M. Mobayyen, H. Klein, and F. W. Bullock

Subjects
Physics, Quark, Particle physics, Large Hadron Collider, Physics and Astronomy (miscellaneous), Hydrogen, Scattering, High Energy Physics::Lattice, Nuclear Theory, High Energy Physics::Phenomenology, chemistry.chemical_element, Diquark, Nuclear physics, chemistry, Isospin, High Energy Physics::Experiment, Neutrino, Nuclear Experiment, Engineering (miscellaneous), Particle Physics - Experiment, Charged current
Abstract

Within the framework of the quark-parton model, the quark and anti-quark structure functions of the proton have been measured by fitting them to the distributions of the events in the Bjorkeny variable. The data used form the largest sample of neutrino and antineutrino interactions on a pure hydrogen target available, and come from exposures of BEBC to the CERN wide band neutrino and antineutrino beams. It is found that the ratiodv/uv of valence quark distributions falls with increasing Bjorkenx. In the context of the quark-parton model the results constrain the isospin composition of the accompanying diquark system. Models involving scattering from diquarks are in disagreement with the data.

Published
1989

31. 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

32. Polarization of Λ hyperons produced inclusively inv p and $$\bar v$$ p charged current interactions

Author

E. F. Clayton, K. Böckmann, S. W. O'Neale, W. Wittek, H. Wachsmuth, Amanda Cooper-Sarkar, O. Villalobos-Baillie, G. T. Jones, Christoph Geich-Gimbel, Jon-Paul R. Wells, G. Myatt, B. Saitta, L. Deck, N. Schmitz, K. L. Wernhard, H. Klein, M. M. Mobayyen, Keith W. J. Barnham, D. Radojicic, B. W. Kennedy, B. Nellen, M. Aderholz, A. Grant, R. Settles, D. R. O. Morrison, Peter Schmid, D. B. Miller, G. Corrigan, and W. Gebel

Subjects
Nuclear physics, Quark, Physics, Physics and Astronomy (miscellaneous), High Energy Physics::Phenomenology, Hyperon, High Energy Physics::Experiment, Parton, Polarization (waves), Lambda, Engineering (miscellaneous), Charged current
Abstract

Lambda hyperons fromv p and\(\bar v\)p charged current interactions have been analysed for polarization. A significant polarization is observed for Λ particles in the quasi-elastic region for both types of interactions. Part of this polarization is due to the decay of highly polarized Σ(1385) resonances. The results are compared with simple predictions of the quark parton model.

Published
1985

33. 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

34. Study of μe events produced in antineutrino interactions

Author

D. Bertrand, S. Natali, T. Azemoon, A. Vayaki, W. Wittek, O. Erriquez, P. O. Hulth, M. M. Mobayyen, S. Leighton-Davis, M. Calicchio, Giuseppe Iaselli, Steve O'Neale, J. H. Bartley, Pierre Marage, W. Venus, E. Zevgolatakos, J. Guy, K. L. Wernhard, C. Kochowski, M. Talebzadeh, Salvatore Nuzzo, H. Klein, M. Aderholz, P. Petiau, Anthony J. Parker, J. P. Baton, V. Brisson, P. Kasper, M. Lagraa, W. Van Doninck, Gh. Bertrand-Coremans, R. P. Middleton, E. Simopoulou, F. W. Bullock, P. Faulkener, Jean Sacton, E. F. Clayton, A. M. Cooper, H. Wachsmuth, G. T. Jones, M. Neveu, Jon-Paul R. Wells, Norbert Schmitz, D. B. Miller, L. Deck, M.T. Fogli-Muciaccia, K. Varvell, T. Coghen, G. Gerbier, and N. Armenise

Subjects
Physics, Nuclear physics, Semileptonic decay, Particle decay, Muon, Physics and Astronomy (miscellaneous), Meson, Branching fraction, Antimatter, Hyperon, Elementary particle, Engineering (miscellaneous)
Abstract

A study is presented of μe events from an exposure of BEBC, filed with an heavyH 2/Ne mixture, to a wide band antineutrino beam at the CERN SPS. The promptμ + e − rate, based on the observation of 45 events withp μ>4 GeV/c andp e>0.8 GeV/c, is found to be 0.31±0.05±0.02%, in agreement with previous determinations made on much smaller statistics. The differential kinematical variables characterizing the events and the content of strange particles are as expected for the production of charmed hadrons which subsequently decay semi-leptonically. An upper limit of 2.0±10−4 at 90% C.L. is given for the production rate of promptμ + e + events. No evidence is found for a significant production of Beauty hadrons.

Published
1984

35. 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

36. 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

37. 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

38. 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

39. Prompt neutrino production in 400 GeV proton copper interactions

Author

G. Myatt, H. Foeth, Norbert Schmitz, A. Vayaki, M. M. Mobayyen, W. Wittek, M. L. Faccini-Turluer, P. Bostock, D. Radojicic, D. R. O. Morrison, M. Talebzadeh, Daniel Vignaud, W. Dröge, Jelena Krstic, Peter Schmid, Luc Pape, H. Kreutzmann, Keith W. J. Barnham, H. Klein, H. Wachsmuth, D.C. Cundy, M. A. Parker, B. Wünsch, U. Idschok, W. Venus, L. Deck, J. Guy, C. Walck, T. Bolognese, A. Grant, E. Simopoulou, H. Grässler, K. Hultqvist, Manolis Dris, G. Harigel, Amanda Cooper-Sarkar, M. Nikolic, D. B. Miller, B. Nellen, M. Aderholz, and P. O. Hulth

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Muon, Proton, Meson, Physics::Instrumentation and Detectors, Astrophysics::High Energy Astrophysical Phenomena, Astrophysics::Cosmology and Extragalactic Astrophysics, Nuclear physics, Pair production, Physics::Accelerator Physics, Muon neutrino, High Energy Physics::Experiment, Neutrino, Electron neutrino, Lepton
Abstract

The prompt electron neutrino and muon neutrino fluxes from proton copper interactions at 400 GeV/c proton momentum have been measured. The asymmetry between the prompt electron (anti) neutrino and the prompt muon (anti) neutrino event rates above 20 GeV is A e μ = (N e − N μ (N c + N μ ) = 0.07 ± 0.08 corresponding to an Ne/Nμ ratio of 1.14−0.16−0.19. The cross section weighted charge asymmetry for electrons and muons combined is A ν ν = 0.15 ± 0.08 . The number of D decays into ν e and ν μ is (4.1 ± 0.9) × 10 −4 per incident proton. No evidence for ντ interactions was found.

Published
1986

40. Production of charmed hadrons in neutrino proton and antineutrino proton charged current interactions

Author

Achim Geiser, S. Burke, J. Kern, M. M. Mobayyen, B. W. Kennedy, W. Wittek, Norbert Schmitz, D. B. Miller, F. W. Bullock, E. Hoffmann, M. Aderholz, H. Wachsmuth, D. Kuhn, G. J. van Oldenborgh, S. Wainstein, R. W. L. Jones, D. Radojicic, D. R. O. Morrison, H. Klein, Peter Schmid, G. T. Jones, U. F. Katz, Steve O'Neale, and G. Myatt

Subjects
Physics, Particle physics, Large Hadron Collider, Physics and Astronomy (miscellaneous), Proton, Scattering, Hadron, Nuclear physics, Production (computer science), Neutrino, Engineering (miscellaneous), Charged current, Particle Physics - Experiment, Bar (unit)
Abstract

Usind data from avp and\(\bar v\)p experiment with BEBC at CERN, the rates for inclusive production ofD*+,Λc+ andD0 invp scattering and ofD*− in\(\bar v\)p scattering are measured. Some examples of the exclusive production ofD*+,Λc+ and∑c++ are given. The cross section for the reactionvp→μ−c++ is estimated.

Published
1987

41. Measurement of the structure functionsF2 andxF3 and comparison with QCD predictions including kinematical and dynamical higher twist effects

Author

T. Coghen, G. Gerbier, Amanda Cooper-Sarkar, C. Vallée, A. Vayaki, W. Wittek, M. Calcchio, V. Brisson, E. F. Claytoh, G. T. Jones, D. R. O. Morrison, M. Aderholz, C. Kochowski, P. Petiau, F. Ruggieri, P. Kasper, N. Armenise, K. Varvell, G. Iaselli, E. Simopoulou, O. Erriquez, Pierre Marage, M. Mermikides, W. Burkot, H. Wachsmuth, Jean Sacton, M. Neveu, S. Natali, J. P. Baton, P. J. Fitch, R. P. Middleton, J. Guy, M. M. Mobayyen, A. Petrides, P. O. Hulth, D. Bertrand, Mikael Berggren, R. A. Sansum, Salvatore Nuzzo, W. Venus, S. W. O'Neale, Jon-Paul R. Wells, H. Klein, M. A. Parker, F. W. Bullock, and Girod, Dominique

Subjects
Quantum chromodynamics, Physics, Particle physics, Physics and Astronomy (miscellaneous), Isoscalar, chemistry.chemical_element, Elementary particle, Lambda, Nuclear physics, Neon, chemistry, [PHYS.PHYS.PHYS-INS-DET] Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], Field theory (psychology), Twist, Nucleon, Engineering (miscellaneous), Particle Physics - Experiment
Abstract

The isoscalar nucleon structure functions F2(x, Q2) and xF3(x, Q2) are measured in the range 0

Published
1987

42. A study of the EMC effect using neutrino and antineutrino interactions in neon and deuterium

Author

A. Vayaki, W. Wittek, Phillip Allport, R. Cirio, H. Wachsmuth, B. Saitta, E. Simopoulou, F. Bobisut, V. Brisson, M. Neveu, Mikael Berggren, D. R. O. Morrison, E. F. Clayton, D. B. Miller, T. Coghen, A. G. Frodesen, P. Petiau, G. Gerbier, P. Kasper, A. M. Rossi, P. O. Hulth, O. Erriquez, C. Vallée, W. Venus, Jean Sacton, Alessandra Romero, K. Varvell, Norbert Schmitz, G. W. Van Apeldoorn, A. Tenner, N. Armenise, R. P. Middleton, M. Calicchio, G. Mandrioli, A. Baldini, F. W. Bullock, P. Capiluppi, A. Marzari-Chiesa, H. Klein, M. A. Parker, P. J. Fitch, J. Guy, Daniel Vignaud, G. Giacomelli, B. Jongejans, G. T. Jones, D. Bertrand, C. Angelini, A. Sansum, N. van Eijndhoven, Amanda Cooper-Sarkar, M. M. Mobayyen, Steve O'Neale, A. Sconza, Pierre Marage, and M. L. Faccini-Turluer

Subjects
Quark, Physics, Particle physics, Valence (chemistry), Physics and Astronomy (miscellaneous), EMC effect, chemistry.chemical_element, Nuclear physics, Neon, chemistry, Deuterium, Physique des particules élémentaires, Neutrino, Nucleon, Engineering (miscellaneous), Charged current, Particle Physics - Experiment
Abstract

Nearly 40000 neutrino and antineutrino interactions in BEBC are compared to measure the differences between neon and deuterium in the quark and antiquark distributions and in the nucleon structure functions. The ratio of Ne to D cross sections indicates some decrease between x∼0.2 and x∼0.6. The y distributions show there is no significant increase in the neon sea, but prefer a small decrease. Taken altogether, the x and y distributions and the measured total cross-sections indicate some change in the shape of the valence distributions. No significant dependence on A is observed for either the shape of the sea or the ratio of longitudinal to transverse cross-sections. © 1987 Springer-Verlag., 0, 52 auteurs, SCOPUS: ar.j, info:eu-repo/semantics/published

Published
1986

43. Observations of shadowing of neutrino and antineutrino - nucleus interactions and comparison with PCAC predictions

Author

T. Coghen, B. Saitta, O. Erriquez, A. Vayaki, W. Wittek, D. R. O. Morrison, Amanda Cooper-Sarkar, G. W. Van Apeldoorn, R. A. Sansum, Marc Neveu, Mikael Berggren, P. P. Allport, G. T. Jones, M. Aderholz, S. W. O'Neale, M. Calicchio, E. Simopoulou, N. Schmitz, J. Guy, M. M. Mobayyen, D. Radojicic, F. W. Bullock, H. Wachsmuth, W. Venus, K. Varvell, M. A. Parker, and Pierre Marage

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Nuclear Theory, Propagator, chemistry.chemical_element, Nuclear physics, Neon, Cross section (physics), medicine.anatomical_structure, Deuterium, chemistry, medicine, High Energy Physics::Experiment, Physics::Atomic Physics, Neutrino, Nuclear Experiment, Nucleon, Nucleus, Charged current, Particle Physics - Experiment
Abstract

Comparing the kinematical distributions of events obtained on neon and deuterium targets in similar experimental conditions reveals a reduction of the neutrino and antineutrino charged current cross section per nucleon in neon at low Q 2 . The effect, interpreted as due to geometric shadowing of the weak propagator in interactions of neutrinos and antineutrinos with nuclei, agrees well with predictions derived from PCAC.

Published
1989

44. Dilepton and Trilepton Production by Antineutrinos and Neutrinos in Neon

Author

P. O. Hulth, Norbert Schmitz, E. F. Clayton, Amanda Cooper-Sarkar, H. Wachsmuth, J. Guy, M. Neveu, D. Bertrand, M. Lagraa, O. Erriquez, J. H. Bartley, N. Armenise, H. Klein, R. P. Middleton, C. Vallée, P. J. Fitch, S. Leighton-Davis, M. A. Parker, E. Zevgolatakos, C. Kochowski, M. M. Mobayyen, R. A. Sansum, A. Vayaki, W. Wittek, Jean Sacton, Salvatore Nuzzo, G. T. Jones, E. Simopoulou, Jon-Paul R. Wells, M. Talebzadeh, P. Kasper, W. Venus, R. Belusevic, M. Calicchio, V. Brisson, D. R. O. Morrison, T. Coghen, J. P. Baton, G. Gerbier, D. Brou, F. W. Bullock, M. Aderholz, P. Petiau, K. Varvell, D. B. Miller, Pierre Marage, and Steve O'Neale

Subjects
Nuclear physics, Physics, Particle physics, Neon, Physics and Astronomy (miscellaneous), chemistry, Physique des particules élémentaires, chemistry.chemical_element, Neutrino, Engineering (miscellaneous), Charged current, Particle Physics - Experiment, Standard Model
Abstract

A sample of over 25,000 fully measured neutrino and antineutrino charged current interactions in BEBC includes 192 dilepton candidates. The prompt signal after subtraction of background is 41 ±7μ+e-, 35±7μ+μ- events from {Mathematical expression} interactions, and 32±7μ-μ+ events from ν interactions. There are 2 trileptons, μ-μ-e+ and μ-μ-μ+. Results are compared with other experimental data and with the standard model. Limits to prompt like sign μ+e+, μ+μ+ and μ-μ- signals are given and compared with other experiments and with theoretical calculations. © 1985 Springer-Verlag., 47 auteurs, SCOPUS: ar.j, info:eu-repo/semantics/published

Published
1985

45. Bounds on light gluinos from the BEBC beam dump experiment

Author

D. R. O. Morrison, Peter Schmid, B. Wünsch, M. M. Mobayyen, J. Guy, Amanda Cooper-Sarkar, W. Venus, P. O. Hulth, M. Talebzadeh, Daniel Vignaud, C. Walck, Norbert Schmitz, H. Klein, M. A. Parker, U. Idschok, M. L. Faccini-Turluer, J. Krstic, K. Hultqvist, P. Bostock, H. Wachsmuth, H. Kreutzmann, H. Grässler, B. Nellen, M. Aderholz, E. F. Clayton, and Subir Sarkar

Subjects
Nuclear reaction, Physics, Nuclear and High Energy Physics, Particle physics, Proton, High Energy Physics::Phenomenology, Elementary particle, Supersymmetry, Symmetry (physics), Gluon, law.invention, Nuclear physics, law, Physics::Accelerator Physics, High Energy Physics::Experiment, Invariant mass, Beam dump, Particle Physics - Experiment
Abstract

Observational upper limits on anomalous neutral-current events in a proton beam dump experiment are used to constrain the possible hadroproduction and decay of light gluinos. These results require ifm g $ 4 GeV for ifm q - minw.

Published
1985

46. Coherent single pion production by antineutrino charged current interactions and test of pcac

Author

M. M. Mobayyen, C. Vallée, M. Calicchio, A. Vayaki, W. Wittek, P. Petiau, R. A. Sansum, E. F. Clayton, Mikael Berggren, Amanda Cooper-Sarkar, G. T. Jones, J. Guy, V. Brisson, P. J. Fitch, S. Natali, K. Varvell, Jean Sacton, D. R. O. Morrison, N. Armenise, W. Venus, D. B. Miller, F. Hamisi, D. Bertrand, P. O. Hulth, Jon-Paul R. Wells, H. Klein, H. Wachsmuth, M. A. Parker, R. P. Middleton, M. Neveu, W. Burkot, O. Erriquez, J. P. Baton, M. Aderholz, P. Kasper, F. W. Bullock, Pierre Marage, P. P. Allport, Steve O'Neale, E. Simopoulou, T. Coghen, G. Gerbier, and Girod, Dominique

Subjects
Physics, Particle physics, Range (particle radiation), Large Hadron Collider, Physics and Astronomy (miscellaneous), Meson, [PHYS.HEXP] Physics [physics]/High Energy Physics - Experiment [hep-ex], Nuclear Theory, chemistry.chemical_element, Propagator, Absolute value, Nuclear physics, Neon, Pion, chemistry, Physique des particules élémentaires, High Energy Physics::Experiment, Nuclear Experiment, Engineering (miscellaneous), Charged current, Particle Physics - Experiment
Abstract

The cross section for coherent production of a single π- meson in charged current antineutrino interactions on neon nuclei has been measured in BEBC to be (175±25) 10-40 cm2/neon nucleus, averaged over the energy spectrum of the antineutrino wide band beam at the CERN SPS; this corresponds to (0.9±0.1) % of the total charged current {Mathematical expression} cross section. The distributions of kinematical variables are in agreement with theoretical predictions based on the PCAC hypothesis and the meson dominance model; in particular, the Q2 dependence is well described by a propagator containing a mass m=(1.35±0.18) GeV. The absolute value of the cross section is also in agreement with the model. This analysis thus provides a test of the PCAC hypothesis in the antineutrino energy range 5-150 GeV. © 1986 Springer-Verlag., 0, 42 auteurs, SCOPUS: ar.j, info:eu-repo/semantics/published

Published
1986

47. Measurement of total cross sections for neutrino and antineutrino charged-current interactions in hydrogen and neon

Author

C. Vallée, Amanda Cooper-Sarkar, A. Vayaki, W. Wittek, Norbert Schmitz, D. Radojicic, O. Erriquez, J. P. Baton, G. Corrigan, M. Calicchio, K. Varvell, B. W. Kennedy, D. Bertrand, H. Wachmuth, D. B. Miller, W. Venus, S. J. Towers, G. T. Jones, D. R. O. Morrison, P. Kasper, Peter Schmid, M. Aderholz, E. Hoffmann, M. M. Mobayyen, M.T. Fogli-Muciaccia, E. Simopoulou, F. Hamisi, P. O. Hulth, Jon-Paul R. Wells, G. Myatt, E. F. Clayton, T. Coghen, P. N. Shotton, Jean Sacton, R. A. Sansum, Keith W. J. Barnham, Steve O'Neale, M. Lagraa, R. P. Middleton, P. J. Fitch, Pierre Marage, Mikael Berggren, H. Klein, M. A. Parker, R. W. L. Jones, F. W. Bullock, and J. Guy

Subjects
Physics, Nuclear and High Energy Physics, Large Hadron Collider, Hydrogen, chemistry.chemical_element, Nuclear physics, Neon, chemistry, Physique des particules élémentaires, Wide band, Neutrino, Atomic physics, Nucleon, Particle Physics - Experiment, Charged current
Abstract

BEBC filled in turn with hydrogen, and with a neon-hydrogen mixture, was exposed to the CERN SPS wide band neutrino and antineutrino beams. The ratios of the charged-current cross sections per nucleon, σ(νH2) σ(νNe) and σ(νH2) σ(νNe), between 20 and 300 GeV were found to be 0.656 ± 0.020 and 1.425 ± 0.052, respectively. Multiplying these ratios by the revised cross sections in neon, σ(νNe) E = (0.723 ± 0.038) × 10-38 cm2/GeV per nucleon and σ(νNe) E = (0.351 ± 0.019) × 10-38 cm2/GeV per nucleon, and their ratio, σ(νNe) σ(νNe) = 0.485 ± 0.020, yields values for the total charged-current cross sections on protons, σ(νp)/E and σ(νp) E, of (0.474 ± 0.029) × 10-38 cm2/GeV and (0.500 ± 0.032) × 10-38 cm2/GeV. respectively, and a value for the ratio σ(νp) σ(νp) of 1.053 ± 0.066. © 1986., 0, SCOPUS: ar.j, info:eu-repo/semantics/published

Published
1986

48. Evidence for higher twist effects in fast π- production by antineutrinos in neon

Author

M. Lagraa, R. P. Middleton, O. Erriquez, P. J. Fitch, E. Zevgolatakos, R. A. Sansum, T. Azemoon, A. Vayaki, W. Wittek, T. Coghen, M. Aderholz, M. Calicchio, Giuseppe Iaselli, P. Kasper, E. F. Clayton, G. Gerbier, H. Wachsmuth, K. Varvell, M. Neveu, W. Venus, G. T. Jones, E. Simopoulou, Mikael Berggren, J. Guy, Jon-Paul R. Wells, F. W. Bullock, M. A. Parker, D. Bertrand, David Miller, M. M. Mobayyen, Amanda Cooper-Sarkar, N. Armenise, C. Vallée, Pierre Marage, Steve O'Neale, P. O. Hulth, and Girod, Dominique

Subjects
Physics, Particle physics, Physics and Astronomy (miscellaneous), [PHYS.HEXP] Physics [physics]/High Energy Physics - Experiment [hep-ex], Physique, Scattering, chemistry.chemical_element, Astronomie, Nuclear physics, Neon, chemistry, Energy spectrum, Physique des particules élémentaires, Twist, Engineering (miscellaneous), Particle Physics - Experiment
Abstract

Evidence for a significant higher twist contribution to high z π- production in antineutrino scattering is presented. In events with W>3 GeV and Q2>1 GeV2 in our data, it accounts for (51 ±8)% of all π- with z above 0.5. It is consistent with the z-Q2 correlations of Berger's higher twist prediction. The data are inconclusive concerning the predicted y-z correlation and pT dependence. The z -Q2 correlation is not adequately described by the Lund Monte-Carlo. © 1986 Springer-Verlag., SCOPUS: ar.j, info:eu-repo/semantics/published

Published
1986

49. COHERENT PRODUCTION OF RHO- MESONS IN CHARGED CURRENT ANTINEUTRINO-NEON INTERACTIONS IN BEBC

Author

N. Armenise, Mikael Berggren, P. P. Allport, M. Calicchio, Jon-Paul R. Wells, Pierre Marage, O. Erriquez, T. Coghen, R. A. Sansum, Jean Sacton, H. Wachsmuth, Amanda Cooper-Sarkar, P. Kasper, M. M. Mobayyen, C. Vallée, J. P. Baton, E. Matsinos, M. Neveu, A. Vayaki, W. Wittek, S. W. O'Neale, F. W. Bullock, G. T. Jones, W. Burkot, D. Bertrand, M. Aderholz, J. Guy, V. Brisson, W. Venus, D. R. O. Morrison, H. Klein, M. A. Parker, U. F. Katz, N. Schmitz, E. Simopoulou, P. Petiau, K. Varvell, E. F. Clayton, F. Hamisi, P. O. Hulth, P. J. Fitch, D. B. Miller, R. P. Middleton, and Girod, Dominique

Subjects
Physics, Particle physics, Large Hadron Collider, Physics and Astronomy (miscellaneous), Meson, [PHYS.HEXP] Physics [physics]/High Energy Physics - Experiment [hep-ex], Physics::Instrumentation and Detectors, Nuclear Theory, chemistry.chemical_element, Vector meson dominance, Absolute value, Nuclear physics, Neon, chemistry, Bubble chamber, High Energy Physics::Experiment, Nuclear Experiment, Engineering (miscellaneous), Particle Physics - Experiment, Beam (structure), Charged current
Abstract

Coherent production of ρ- mesons in charged current antineutrino interactions on neon nuclei is studied in the BEBC bubble chamber exposed to the CERN SPS wide band beam. The cross section is measured to be (95±25)·10-40 cm2 per neon nucleus, averaged over the beam energy spectrum. The distributions of kinematical variables and the absolute value of the cross section are in agreement with theoretical predictions based on the CVC hypothesis and the vector meson dominance model. © 1987 Springer-Verlag.

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