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1. A study of the general characteristics of proton-antiproton collisions at √s=0.2 to 0.9 TeV

Author

H. G. Moser, G. Busetto, C. Bacci, A. Bezaguet, D. Linglin, H. Faissner, Christopher Seez, A. Astbury, E. Tscheslog, Daniel J. Smith, James Rohlf, G. Walzel, O. C. Allkofer, Teresa Rodrigo, Jean-Pierre Merlo, R. Bonino, A. Moulin, P. I. P. Kalmus, G. Maurin, J. Garvey, K. Bos, D. Samyn, S. Tether, C. Markou, C. Rubbia, W. van de Guchte, M. Pimiä, J. Dorenbosch, E. Eisenhandler, G. Bauer, P. Erhard, G. Sajot, M. Schröder, Sergio Cittolin, J.P. Vialle, I. F. Fensome, Paraskevas Sphicas, V. O'Dell, D. Schinzel, P. Biddulph, Stefano Veneziano, A. van Dijk, J. Sass, K. Eggert, R. J. Apsimon, X. Wu, I. Zacharov, F. Szoncso, W. von Schlippe, Alessandro Bettini, B. Buschbeck, J. P. Debrion, M. Botlo, A. Schwartz, G. Thompson, R. Leuchs, L. Naumann, Margret Fincke-Keeler, A. Caner, I. Siotis, L. Taylor, G.F. Cox, P. Casoli, W.J. Haynes, Tejinder Virdee, J. P. Revol, P. Cennini, M. Nikitas, A. Geiser, Steve McMahon, J. P. Mendiburu, Francesco Lacava, V. Vuillemin, Carmen Albajar, C. Zaccardelli, D. Joyce, Anton Taurok, H. Dibon, M. G. Albrow, S. Beingessner, W. G. Scott, John A Coughlan, T. Moers, M. Yvert, Veikko Karimäki, Murrough Landon, T. C. Bacon, E. Radermacher, G. Pancheri, Guido Ciapetti, N. Bains, Christian Ghiglino, I. ten Have, Hans Reithler, Jorma Tuominiemi, Anna Teresa Meneguzzo, Th. Müller, Dave Charlton, Claudia J. Stubenrauch, S. Lammel, A. Gonidec, D. Kryn, Aleandro Nisati, T. Redelberger, W. Jank, E. F. Clayton, Pierluigi Zotto, A. Ferrando, M. Jimack, G. Salvini, A. Böhrer, J. P. Porte, M. Preischl, E. Pietarinen, M. A. Marquina, Daniel Denegri, R. Prosi, A. Diciaccio, J. D. Dowell, T. Fuess, Ritva Kinnunen, B. Mours, M. Markytan, Felicitas Pauss, M. Ikeda, Filippo Ceradini, J. Vrana, T. P. Shah, J. Colas, I. Wingerter, J. Kroll, L. Zanello, W. Kienzle, A. Norton, F. Cavanna, G. Piano Mortari, K. Ankoviak, David B. Cline, L. Fortson, M. Degiorgi, H. Bohn, C.-E. Wulz, R. Conte, L. Dobrzynski, G. Jorat, Jonathan M. Gregory, Peter Lipa, M. Lindgren, Alain Givernaud, D. Dau, M. Della Negra, B. Andrieu, F. J. Diez Hedo, S. Geer, P. Nedelec, Akram Khan, P. Colas, Nicolas Ellis, T. C. Meyer, S. Levegrün, Y. Giraud-Héraud, A. Kernan, K. Morgan, E. Petrolo, Richard Keeler, K. Wacker, M. Mohammadi, Manfred Krammer, Konstanty Sumorok, D. J. Holthuizen, S. Centro, M. Demoulin, I. R. Kenyon, Dave Robinson, A. Placci, and B. Aubert

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Large Hadron Collider, Proton, Physics::Instrumentation and Detectors, 010308 nuclear & particles physics, Detector, 7. Clean energy, 01 natural sciences, Charged particle, law.invention, Momentum, Nuclear physics, Transverse plane, law, Antiproton, 0103 physical sciences, Physics::Accelerator Physics, High Energy Physics::Experiment, Nuclear Experiment, 010306 general physics, Collider, Particle Physics - Experiment
Abstract

The general characteristics of inelastic proton-antiproton collisions at the CERN SPS Collider are studied with the UA1 detector using magnetic and calorimetric analysis. Results are presented on charged particle multiplicities and transverse and longitudinal momenta, and on total transverse energy distributions at centre of mass energies ranging from 0.2 to 0.9 TeV.

Published
1990
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2. Search for new heavy quarks in proton-antiproton collisions at $$\sqrt s = 0.63 TeV$$

Author

A. Caner, G. Maurin, S. Bartha, Nicolas Ellis, W. van de Guchte, M. Botlo, Peter Lipa, Aleandro Nisati, Christopher Seez, Anna Teresa Meneguzzo, Y. Zolnierowski, Felicitas Pauss, Filippo Ceradini, W. von Schlippe, T. A. Fuess, D. Denegri, V. Vuillemin, A. Ferrando, M. Yvert, T.I. Meyer, J. Dorenbosch, Alain Givernaud, P. Sphicas, L. Taylor, H. Tuchscherer, K. Eggert, D. Samyn, M. Rauschkolb, F. J. Diez Hedo, M. A. Marquina, D. Kryn, D. Brockhausen, Jorma Tuominiemi, G. Busetto, J. Garvey, J. D. Dowell, M. Lindgren, M. Jimack, E. Pietarinen, Carmen Albajar, I. R. Kenyon, Vivian O'Dell, J. Gronberg, C. Bacci, J. P. Vialle, A. Bezaguet, Ludovico Pontecorvo, B. Andrieu, Stefano Veneziano, J. Colas, M. Degiorgi, H. Bohn, G. Sajot, S. A. Robins, S. Tether, J. Salicio, L. Dobrzynski, P. Erhard, Marta Felcini, C. Daum, J. P. Merlo, David Robinson, D. Schinzel, M. Della Negra, John A Coughlan, Maria Isabel Josa, B. Aubert, P. Nedelec, H. Castilla-Valdez, Barbara Alvarez Gonzalez, A. van Dijk, R. Leuchs, L. Zanello, A. Moulin, A. Norton, T. P. Shah, E. Eisenhandler, C.-E. Wulz, E. Tscheslog, J. P. Revol, L. Naumann, A. Gonidec, Andreas Morsch, G. Ciapetti, M. Vargas, R. Conte, E. Rademacher, Claudia J. Stubenrauch, Hal Evans, C. D. Buchanan, Achim Geiser, R. Martinelli, S. Lammel, K. Morgan, F. Cavanna, P. Cennini, Manfred Krammer, Y. Lemoigne, Sergio Cittolin, Konstanty Sumorok, S. Otwinowski, G. Piano Mortari, Hans Reithler, M. P. J. Landon, D. J. Holthuizen, B. Buschbeck, E. F. Clayton, L. Fortson, Emilio Petrolo, Ritva Kinnunen, A. Placci, M. Pimiä, S. Beingessner, James Rohlf, S. Centro, J. Kroll, J. P. Porte, Th. Müller, M. Demoulin, P. I. P. Kalmus, W. Jank, M. Markytan, D. Cline, C. Rubbia, Tejinder Virdee, G. Bauer, Francesco Lacava, D. H. Stork, R. Munoz, F. Szoncso, E. Torrente-Lujan, P. Biddulph, G. Walzel, J. P. Mendiburu, J. Vrana, K. Ankoviak, Alessandro Bettini, G. Thompson, S. Levegrün, D. Linglin, G.F. Cox, P. Casoli, H. Dibon, Veikko Karimäki, K. Bos, G. Pancheri, D. Dau, A. Böhrer, I. F. Fensome, Pierluigi Zotto, H. Faissner, M. Mohammadi, M. Nikitas, D. Drijard, K. Wacker, R. J. Apsimon, T. Rodrigo, Michael Albrow, O. C. Allkofer, Matthias Schröder, Xin Wu, I. Zacharov, R. Bonino, M. Passaseo, R. Prosi, Steve McMahon, Anton Taurok, T. Moers, C. Markou, A. Diciaccio, G. Jorat, and Jonathan M. Gregory

Subjects
Physics, Quark, Particle physics, Large Hadron Collider, Muon, Physics and Astronomy (miscellaneous), Proton, High Energy Physics::Lattice, High Energy Physics::Phenomenology, law.invention, Standard Model, Nuclear physics, law, Antiproton, High Energy Physics::Experiment, Collider, Engineering (miscellaneous), Particle Physics - Experiment, Bar (unit)
Abstract

We report on a search for new heavy quarks decaying semileptonically into muons, using 4.7 pb−1 of data taken during the CERN\(p\bar p\) collider runs in 1988 and 1989. The properties of isolated muons accompanied by jets are consistent with the predictions from the Standard Model but do not show a signal for a new heavy quark. Combining all the UA1 data (5.4 pb−1), lower mass limits are obtained at 60 GeV/c2 (95% CL) for thet-quark and 43 GeV/c2 (95% CL) for a fourth-generation charge-1/3 quark (b′-quark).

Published
1990
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3. 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

4. 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

5. 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

6. Multifractal analysis of minimum bias events in $\sqrt{s}$ = 630 GeV $\overline{p}$p collisions

Author

Vuillemin, Karimaki, Murrough Landon, N Neumeister, A. Ferrando, H. Tuchscherer, Hans Reithler, O. C. Allkofer, P. Cennini, E. F. Clayton, Peter Lipa, A. Placci, R. Priem, I. F. Fensome, E. Radermacher, J. P. Porte, G Thompson, H. Dibon, C. Markou, H. Faissner, D Robinson, Nicolas Ellis, Felicitas Pauss, J. P. Revol, L. Naumann, P I P Kalmus, M. Della Negra, M. Rauschkolb, C H Tan, R. J. Apsimon, L. Taylor, G. Pancheri, P. Sphicas, Andreas Morsch, H. Wagner, D Schinzel, C. Rubbia, A. Böhrer, A. Moulin, G. Jorat, G. Walzel, D. Dau, Achim Geiser, Alain Givernaud, Carmen Albajar, B. Buschbeck, D. Samyn, S. Levegrün, Steve McMahon, K. Wacker, W. Jank, Jorma Tuominiemi, W. von Schlippe, Anton Taurok, Manfred Krammer, Konstanty Sumorok, T. Moers, R. Schleichert, E F Eisenhandler, R. Prosi, Ritva Kinnunen, Tejinder Virdee, M. Pimiä, D Weselka, H. Teykal, J. Garvey, M. Markytan, J. D. Dowell, E. Pietarinen, S. Bartha, T.P. Shah, A. Norton, Stephan Lammel, T.I. Meyer, C.-E. Wulz, A Bezaguet, I. Josa-Mutuberria, M. Demoulin, G. Maurin, J. Salicio, Sergio Cittolin, F. Szoncso, John A Coughlan, Christopher Seez, S. Tether, K. Eggert, E Terrente-Lujan, I. R. Kenyon, and A. Gonidec

Subjects
Physics, Quark, Particle physics, Physics and Astronomy (miscellaneous), Monte Carlo method, Hadron, Observable, Multifractal system, Measure (mathematics), Bin, Exponent, High Energy Physics::Experiment, Statistical physics, Engineering (miscellaneous), Particle Physics - Experiment
Abstract

A search for multifractal structures, in analogy with multifractal theories, is performed on UA1 minimum bias events. A downward concave multifractal spectral function,f(α) (where α is the Lipschitz-Holder exponent), indicates that there are self-similar cascading processes, governing the evolution from the quark to the hadron level, in the final states of hadronic interactions.f(α) is an accurate measure of the bin to bin fluctuations of any observable. It is shown that the most sensitive comparison between data and the Monte Carlo models, GENCL and PYTHIA 4.8 can be made usingf(α). It is found that these models do not fully reproduce the behaviour of the data.

Published
1992

7. 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

8. 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

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
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10. 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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11. 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

12. 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

13. 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

14. 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

15. Di-lepton events in the BEBC narrow-band beam neutrino experiment

Author

D. Radojicic, B. Saitta, R. Hartmann, Christoph Geich-Gimbel, P. Porth, R. Schulte, E. Pagiola, S. Banerjee, H. Grässler, D. Haidt, D.C. Cundy, D. Kirch, P. Schmitz, C. L. Davis, E. J. W. West, M. Debeer, P. C. Bosetti, T. Vignaud, Ch. Peyrou, M. Bloch, P. Fritze, W. Hart, Y. Sacquin, I. Butterworth, P. Grossmann, D. J. Kocher, Keith W. J. Barnham, P. O. Hulth, H. Emans, R. McGow, K. Böckmann, D. B. Miller, V. Peterson, Luc Pape, J. Morfin, H. Deden, F. J. Hasert, A. Grant, D. R. O. Morrison, Peter Schmid, G. Myatt, T. P. Kokott, D. H. Perkins, K. J. Powell, R. Beuselinck, J. Figiel, J. H. Mulvey, H. Wachsmuth, P. Renton, B. Tallini, K. L. Wernhard, V. Baruzzi, W. Meincke, Luciano Barone, R. Pech, R. Pons, E. F. Clayton, B. Nellen, A. Keller, and H. Seyfert

Subjects
Nuclear physics, Physics, Nuclear and High Energy Physics, Narrow band, Analytical chemistry, Neutrino beam, Neutrino, Multiplicity (chemistry), Particle Physics - Experiment, Lepton
Abstract

In film taken with BEBC filled with a Ne(74%mol)/H 2 mixture and exposed to the CERN narrow-band neutrino beam (200 GeV), tenμ − μ + , one μ − μ + μ − and five μ − e + events were found in the ν exposure and two μ + μ − events and one μ + e − event in the ν exposure. Assuming the same production mechanism for μμ and μe events, the relative rates, corrected for identification inefficiency and background, can be combined and are (1.3 ± 0.4)% for (μ − e + + μ − μ + )/μ − in neutrino interactions, and (1.2 ± 0.5)% for (μ + e − + μ + μ − )/μ + antineutrino interactions. Eight out of the sixteen μ − l + events have a V 0 , leading to a corrected K 0 -multiplicity of 1.7 ± 0.7. No evidence is found for heavy-lepton production.

Published
1977

16. Observation of prompt neutrinos from 400 GeV proton-nucleus collisions

Author

H. Grässler, M. Bloch, J. Figiel, Ch. Peyrou, H. Wachsmuth, G. Myatt, P. Grossmann, K. Böckmann, Y. Sacquin, E. F. Clayton, R. McGow, R. Hartmann, R. Rödel, B. Conforto, M. Deutschmann, P. O. Hulth, E. Heilmann, S. J. Chima, D. R. O. Morrison, V. T. Cocconi, H. Deden, Christoph Geich-Gimbel, Peter Schmid, B. Saitta, E. Pagiola, D. Vignaud, R. Beuselinck, P. Porth, B. Tallini, D. Radojicic, J. H. Mulvey, K. Schultze, D. Haidt, K. L. Wernhard, V. Baruzzi, A. Grant, M. Debeer, B. Nellen, C. L. Davis, P. Fritze, W. Hart, P. Renton, D. J. Kocher, A. Vayaki, H. Seyfert, P. C. Bosetti, K. J. Powell, Keith W. J. Barnham, W.F. Fry, W. Krenz, R. Pech, J. von Krogh, W. G. Scott, Luc Pape, J. Morfin, G. Kellner, R. Schulte, D. H. Perkins, D.C. Cundy, R. Pons, H. Emans, T. P. Kokott, and P. Schmitz

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Large Hadron Collider, Proton, Astrophysics::High Energy Astrophysical Phenomena, High Energy Physics::Phenomenology, Flux, Electron, lcsh:QC1-999, Nuclear physics, High Energy Physics::Experiment, Neutrino, Nuclear Experiment, Axion, Beam (structure), lcsh:Physics, Particle Physics - Experiment, Lepton
Abstract

In 70 000 photos taken in BEBC during an experiment in which the 400 GeV proton beam of the CERN SPS was dumped into a massive Cu target 820 m upstream of BEBC, 70 interactions induced by neutral primaries above 10 GeV were observed. In 11 events the secondary charged lepton is an e − , in four events an e + . This number of electron events cannot be due to electron neutrinos from conventional sources (K, Λ, Σ − decays). The flux of the additional (prompt) neutrinos is evaluated. Possible origins are discussed in terms of charmed particles, τ's, and as yet undiscovered particles. Limits are given on axion production.

Published
1978

17. 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

18. 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

19. 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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