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1. PRODUCTION OF CHARMED PARTICLES IN 250 GEV MU+-IRON INTERACTIONS

Author

H.E. Montgomery, D. Williams, J. Favier, J.H. Cobb, J. Gayler, J. M. Crespo, K. Moser, H. Pessard, H. Wahlen, C. Best, J. J. Aubert, W. Stockhausen, K. Rith, M. Henckes, X. De Bouard, M. Leenen, J.K. Davies, Klaus Hamacher, W.S.C. Williams, Jennifer S. Haas, M.I. Ferrero, E. Gabathuler, F.W. Brasse, H. E. Stier, L. Massonnet, A. W. Edwards, M. Schneegans, S.C. Brown, V. Gerhardt, J.M. Thenard, Stephen Wimpenny, P. R. Norton, M. Villers, P.F. Dalpiaz, J. C. Thompson, E. Boehm, J.G. Williamson, K.H. Becks, P. Dalpiaz, P. Payre, A.M. Osborne, J. Drees, P. Gregory, J. McNicholas, T. J. Sloan, G. Bassompierre, Cristiana Peroni, L. Urban, V. Korbel, Richard Mount, R. Gamet, W.D. Dau, W. Flauger, M. Edwards, Y. Declais, J. Carr, W. Mohr, U. Pietrzyk, P.J. Hayman, M. Whalley, U. Dosselli, R.W. Dobinson, Ulrich Landgraf, Claus Goessling, G. D'Agostini, G. Coignet, H. Minssieux, F. Combley, M. Maire, R. W. Clifft, and C. Broll

Subjects
Physics, Quark, Nuclear and High Energy Physics, Particle physics, Muon, Meson, Branching fraction, High Energy Physics::Phenomenology, Nuclear Theory, Charm quark, Nuclear physics, Particle decay, Pair production, High Energy Physics::Experiment, Nuclear Experiment, Nucleon, Particle Physics - Experiment
Abstract

Dimuon and trimuon events produced by the interaction of 250 GeV muons in an iron target have been studied and are shown to originate predominantly from charm production. The data are used to measure the contribution of charm to the nucleon structure function F 2 . The cross sections for real photoproduction ( Q 2 =0) of charm in the current fragmentation region are derived as a function of photon energy and are found to be ∼0.6% of the total, hadronic photoproduction cross section in this energy range. The measured cross sections are found to be well represented by the photon-gluon fusion model. The charmed quark fragmentation function is obtained by using this model to fit the measured decay muon energy distribution and is found to be well represented by exp(1.6±1.6) Z . The data are used to study the momentum distribution of the gluons in the nucleon. An upper limit of 1.4% (90% confidence level) is set on the branching ratio D→ μν and a model-dependent upper limit on the branching ratio F→ μν is derived.

Published
2016

2. Measurement of the Q2, x and W2 dependence of single hadron production in deep inelastic muon scattering

Author

C. Broll, H.E. Montgomery, J. Gayler, J. M. Crespo, Uwe Pietrzyk, L. Massonnet, J. Favier, A. W. Edwards, J.M. Thenard, C. Best, P. R. Norton, Claus Gössling, H. Pessard, K. Moser, U. Dosselli, Klaus Hamacher, M. Leenen, F.W. Brasse, D. Williams, K.H. Becks, W.S.C. Williams, J.H. Cobb, Joshua Thompson, F. Combley, M. Maire, M. Schneegans, G. Coignet, W. Stockhausen, G. Bassompierre, V. Korbel, P. Payre, Richard Mount, H. Wahlen, A.M. Osborne, T. J. Sloan, Y. Declais, J. Carr, H. E. Stier, M. C. Edwards, Cristiana Peroni, H. Forsbach, Jennifer S. Haas, S.C. Brown, M. Whalley, R.W. Dobinson, R. Gamet, P. Dalpiaz, P.J. Hayman, G.R. Court, L. Urban, P. Gregory, Ulrich Landgraf, E. Böhm, Stephen Wimpenny, J. McNicholas, W.D. Dau, M. Villers, P.F. Dalpiaz, R. W. Clifft, K. Rith, J. Drees, M. Henckes, H. Minssieux, J.K. Davies, E. Nagy, M.I. Ferrero, V. Gerhardt, W. Mohr, J. J. Aubert, X. De Bouard, E. Gabathuler, and W. Flauger

Subjects
Physics, Quantum chromodynamics, Nuclear and High Energy Physics, Single variable, Particle physics, High energy, Muon, Scattering, Hadron, High Energy Physics::Phenomenology, Nuclear physics, High Energy Physics::Experiment, Scaling, Particle Physics - Experiment, Energy (signal processing)
Abstract

Measurements are presented of the distributions in scaled energy of the hadrons produced in high energy muon scattering. The observed dependence on x (non-factorisation) and Q 2 (scaling violation) is similar to that expected from next to leading order QCD calculations. These variations in the data can be equivalently represented by a dependence on the single variable W 2 .

Published
2016

3. QCD ANALYSIS OF THE STRUCTURE-FUNCTION F2 IN MUON NUCLEON-SCATTERING

Author

Uwe Pietrzyk, A. W. Edwards, W.S.C. Williams, A.M. Osborne, T. J. Sloan, K. Moser, J.R. Holt, J.M. Thenard, R.W. Dobinson, H. Jokisch, W. Mohr, J.G. Williamson, P. R. Norton, G. Bassompierre, R. W. Clifft, V. Korbel, J. Favier, L. Urban, S.C. Brown, Cristiana Peroni, Klaus Hamacher, M. C. Edwards, D. Williams, F. Combley, J.H. Cobb, H. Wahlen, P. Payre, K.H. Becks, M. Maire, C. Best, E. Böhm, J. Carr, H. Pessard, C. Broll, H.E. Montgomery, W. Flauger, M. Leenen, J. J. Aubert, J. Gayler, M. Whalley, Joshua Thompson, Claus Gössling, M. Schneegans, X. De Bouard, M. Henckes, P. Dalpiaz, E. Gabathuler, G. D'Agostini, G.R. Court, Richard Mount, U. Dosselli, G. Krikonis, J. M. Crespo, W.D. Dau, R. Gamet, M. Villers, P.F. Dalpiaz, G. Coignet, H. E. Stier, F.W. Brasse, J.K. Davies, M.I. Ferrero, L. Massonnet, Y. Declais, V. Gerhardt, W. Stockhausen, P. Gregory, Jennifer S. Haas, Ulrich Landgraf, P.J. Hayman, H. Minssieux, J. Drees, J. McNicholas, K. Rith, and Stephen Wimpenny

Subjects
Physics, Quantum chromodynamics, Nuclear and High Energy Physics, Particle physics, Muon, Scattering, Inelastic scattering, Gluon, Nuclear physics, High Energy Physics::Experiment, Charm (quantum number), Nucleon, Electron scattering, Particle Physics - Phenomenology
Abstract

A QCD analysis in leading and next to leading order of the structure function F 2 measured in deep inelastic muon nucleon scattering is presented. Taking into account several phenomenological uncertainties, including the gluon description and the charm contribution, fits to the data give values of the QCD scale parameter Λ LO in the range 7-–250 MeV. A consistent description of muon scattering and lower Q 2 electron scattering requires the presence of higher twist 1/ Q 2 contributions to the scale breaking which are then determined as a function of x from the data.

Published
2016

4. The ratio of the nucleon structure functions F2N for iron and deuterium

Author

M. Leenen, Joshua Thompson, M. Schneegans, G. D'Agostini, S.C. Brown, K. Rith, W. Stockhausen, Jennifer S. Haas, W.S.C. Williams, W.D. Dau, M. Henckes, H. E. Stier, J. J. Aubert, A.M. Osborne, Stephen Wimpenny, P. Payre, T. J. Sloan, D. Williams, H. Pessard, E. Böhm, C. Best, X. De Bouard, J. Favier, K. Moser, J.H. Cobb, R. Gamet, E. Gabathuler, C. Broll, J. Drees, H.E. Montgomery, J.K. Davies, M. Whalley, M.I. Ferrero, P.J. Hayman, J. Gayler, Klaus Hamacher, H. Wahlen, V. Gerhardt, G.R. Court, M. C. Edwards, F. Combley, M. Maire, K.H. Becks, Claus Gössling, Cristiana Peroni, M. Villers, F.W. Brasse, Ulrich Landgraf, R. W. Clifft, Richard Mount, J. McNicholas, H. Minssieux, Uwe Pietrzyk, Y. Declais, J.G. Williamson, U. Dosselli, A. W. Edwards, J.M. Thenard, V. Korbel, G. Coignet, P. R. Norton, J. Carr, G. Bassompierre, L. Urban, W. Mohr, R.W. Dobinson, and W. Flauger

Subjects
Physics, Nuclear and High Energy Physics, Muon, Scattering, Structure function, EMC effect, European Muon Collaboration, Nuclear physics, Deuterium, High Energy Physics::Experiment, Atomic physics, Nuclear Experiment, Nucleon, Particle Physics - Experiment
Abstract

Using the data on deep inelastic muon scattering on iron and deuterium the ratio of the nucleon structure functions F 2 N ( Fe )/ F 2 N ( D ) is presented. The observed x -dependence of this ratio is in disagreement with existing theoretical predictions.

Published
2016

5. A search for free quarks in deep inelastic muon scattering

Author

Claus Goessling, W.S.C. Williams, J. McNicholas, H. E. Stier, H. Wahlen, M. Henckes, K. Moser, H. Pessard, Stephen Wimpenny, K.H. Becks, W. Stockhausen, C. Best, R.W. Dobinson, P.J. Hayman, R. W. Clifft, J. Favier, V. Korbel, F. Combley, M. Maire, Jennifer S. Haas, P. Payre, Klaus Hamacher, Richard Mount, Cristiana Peroni, S.C. Brown, M. Leenen, D. Williams, U. Dosselli, Y. Declais, G. Bassompierre, J.K. Davies, M.I. Ferrero, W. Mohr, J.H. Cobb, Uwe Pietrzyk, Joshua Thompson, W.D. Dau, J. Carr, G. von Holtey, V. Gerhardt, M. Schneegans, F.W. Brasse, A. W. Edwards, M. Whalley, L. Urban, G. D'Agostini, J.M. Thenard, A.M. Osborne, P. R. Norton, T. J. Sloan, G.R. Court, W. Flauger, G. Coignet, J. Drees, J. J. Aubert, E. Boehm, Ulrich Landgraf, H. Minssieux, X. De Bouard, E. Gabathuler, C. Broll, H.E. Montgomery, R. Gamet, M. C. Edwards, J. Gayler, K. Rith, Laboratoire d'Annecy de Physique des Particules (LAPP), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS), Centre de Physique des Particules de Marseille (CPPM), Aix Marseille Université (AMU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), EMC, and BOMBAR, Claudine

Subjects
Quark, Physics, Nuclear and High Energy Physics, Particle physics, Large Hadron Collider, Muon, Spectrometer, [PHYS.HEXP] Physics [physics]/High Energy Physics - Experiment [hep-ex], 010308 nuclear & particles physics, Scattering, Physics::Instrumentation and Detectors, EMC effect, 01 natural sciences, 7. Clean energy, Charged particle, Nuclear physics, Muon collider, 0103 physical sciences, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], Physics::Accelerator Physics, High Energy Physics::Experiment, 010306 general physics, Nuclear Experiment, Particle Physics - Experiment
Abstract

A search was made at the CERN SPS for long-lived fractionally charged particles produced in deep inelastic muon interactions on a Be target using the existing muon beam line as a spectrometer. No such particles were found, leading to upper limits for the production cross section of the order of 10 −36 cm 2 for 200 GeV incident muon momentum and quark masses below 9 GeV for the 2 3 charge and 15 GeV for 1 3 charge.

Published
2016

6. An experimental limit on the intrinsic charm component of the nucleon

Author

A. W. Edwards, J.M. Thenard, P. R. Norton, E. Böhm, J. M. Crespo, J. J. Aubert, R.W. Dobinson, M. Villers, P.F. Dalpiaz, R. W. Clifft, P.J. Hayman, X. De Bouard, L. Massonnet, Claus Gössling, E. Gabathuler, J. Favier, F.W. Brasse, W. Stockhausen, M. Henckes, L. Urban, C. Broll, H.E. Montgomery, K.H. Becks, W. Flauger, P. Payre, Jennifer S. Haas, H. E. Stier, Ulrich Landgraf, J. Gayler, P. Ghez, F. Combley, M. Maire, U. Dosselli, K. Rith, Richard Mount, W.D. Dau, Cristiana Peroni, J.G. Williamson, J.K. Davies, Klaus Hamacher, K. Moser, R. Gamet, P. Gregory, M.I. Ferrero, J. Drees, Y. Declais, V. Gerhardt, G. Bassompierre, H. Wahlen, W. Mohr, W.S.C. Williams, C. Best, H. Minssieux, M. Leenen, Joshua Thompson, M. Schneegans, G. D'Agostini, A.M. Osborne, T. J. Sloan, H. Pessard, G. Coignet, M. Whalley, M. C. Edwards, S.C. Brown, D. Williams, J.H. Cobb, J. McNicholas, P. Dalpiaz, Stephen Wimpenny, V. Korbel, J. Carr, and Uwe Pietrzyk

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Photon, Component (thermodynamics), High Energy Physics::Phenomenology, Gluon, Nuclear physics, Cross section (physics), Content (measure theory), High Energy Physics::Experiment, Limit (mathematics), Charm (quantum number), Nucleon, Nuclear Experiment, Particle Physics - Experiment
Abstract

Charm production has been studied through multimuon events produced in 250 GeV μ + -interactions. The measured dimuon cross section is in agreement with the photon gluon fusion model at low values of Bjorken x within statistical and systematic errors. At larger values of x Bi the data do not support the magnitude of intrinsic charm used to explain hadro-production of charm. Upper limits on the intrinsic charm content of the nucleon are derived from the data.

Published
2016

7. Measurement of the nucleon structure function F2 in muon-iron interactions at 120,250 and 280 GeV

Author

J. M. Crespo, E. Schlösser, M. Villers, P.F. Dalpiaz, R.W. Dobinson, L. Massonnet, M. Leenen, G. Gössling, S.C. Brown, V. Korbel, Joshua Thompson, D. Williams, J. Drees, H. Pessard, J.H. Cobb, Richard Mount, J. McNicholas, F.W. Brasse, M. Schneegans, J. Favier, R. W. Clifft, Klaus Hamacher, E. Böhm, J. J. Aubert, J. Carr, U. Dosselli, Y. Declais, C. Broll, H.E. Montgomery, G. D'Agostini, H. E. Stier, Stephen Wimpenny, X. De Bouard, F. Combley, M. Maire, R. Gamet, J. Gayler, E. Gabathuler, H. Wahlen, W. Mohr, W.D. Dau, P. Gregory, J.K. Davies, K.H. Becks, G. Coignet, M.I. Ferrero, Ulrich Landgraf, M. Henckes, P. Payre, K. Rith, K. Moser, Uwe Pietrzyk, P.J. Hayman, V. Gerhardt, A. W. Edwards, C. Best, J.M. Thenard, P. R. Norton, M. C. Edwards, W. Stockhausen, Jennifer S. Haas, P. Dalpiaz, Cristiana Peroni, H. Minssieux, U. Hahn, W. Flauger, A.M. Osborne, T. J. Sloan, P. Ghez, J.G. Williamson, W.S.C. Williams, G. Bassompierre, M. Whalley, J.R. Holt, L. Urban, G.R. Court, and H. Jokisch

Subjects
Quantum chromodynamics, Physics, Nuclear and High Energy Physics, Particle physics, Muon, Hadron, Elementary particle, Deep inelastic scattering, Nuclear physics, Baryon, High Energy Physics::Experiment, Symmetry breaking, Nucleon, Particle Physics - Experiment
Abstract

A measurement of the nucleon structure function F2 on iron is presented. The data cover a kinematic range of 3.25 {slanted equal to or less-than} Q2 {slanted equal to or less-than} 200 GeV2and 0.05 {slanted equal to or less-than} x {slanted equal to or less-than} 0.65. The data clearly show scaling violation. Fits in leading-order QCD have been made and values for the scale breaking parameter λ are given. © 1981.

Published
1981

8. Measurement of in deep inelastic muon-proton scattering

Author

F. Combley, M. Maire, W.S.C. Williams, P. Payre, V. Korbel, M. Leenen, Joshua Thompson, M. Schneegans, G. D'Agostini, J. Favier, C. Best, D. Williams, Uwe Pietrzyk, P.F. Dalpiaz, M. C. Edwards, Klaus Hamacher, J.H. Cobb, J. Carr, A.M. Osborne, J.K. Davies, A. W. Edwards, T. J. Sloan, J.M. Thenard, M.I. Ferrero, Claus Goessling, H. Pessard, K. Moser, P. R. Norton, M. Whalley, V. Gerhardt, J. J. Aubert, H. E. Stier, P.J. Hayman, C. Broll, H.E. Montgomery, K. Rith, H. Wahlen, H. Jokisch, X. De Bouard, U. Dosselli, M. Henckes, Cristiana Peroni, E. Gabathuler, J.G. Williamson, J. McNicholas, J. Drees, J. Gayler, F.W. Brasse, G.R. Court, P. Gregory, Stephen Wimpenny, G. Bassompierre, P. Dalpiaz, G. Coignet, E. Boehm, L. Urban, S.C. Brown, J. M. Crespo, R. Gamet, L. Massonnet, H. Minssieux, R.W. Dobinson, W. Mohr, W. Flauger, K.H. Becks, Richard Mount, Y. Declais, W. Stockhausen, Jennifer S. Haas, W.D. Dau, R. W. Clifft, Ulrich Landgraf, and M. Villiers

Subjects
Nuclear physics, Quantum chromodynamics, Physics, Nuclear and High Energy Physics, X-ray Raman scattering, Muon, Scattering, Absorption cross section, High Energy Physics::Experiment, Scattering length, Inelastic scattering, Nuclear Experiment, Deep inelastic scattering
Abstract

The ratio R = σ L σ T of the longitudinal to the tranverse photon absorption cross section has been determined from deep inelastic muon-proton scattering at incident energies of 120, 200 and 280 GeV. The results are given as a function of the variables x , Q 2 and ν of the interaction. In the kinematic range 60 ⩽ ν ⩽ 160 GeV at 〈 Q 2 〉 = 22.5 GeV 2 an average value of R = 0.00 ± 0.10 has been obtained.

Published
1983

9. $\rho^{0}$ production in deep inelastic $\mu$ -p interactions

Author

H. Wahlen, Claus Goessling, M. Leenen, Joshua Thompson, M. Schneegans, G. D'Agostini, C. Broll, H.E. Montgomery, F. Combley, M. Maire, V. Korbel, C. Best, J. Gayler, J.G. Williamson, M. C. Edwards, J. Favier, J. Carr, E. Nagy, D. Williams, M. Villers, W. Mohr, G. Bassompierre, J.H. Cobb, Klaus Hamacher, C. Benchouk, L. Urban, J. Mcnicolas, F.W. Brasse, U. Dosselli, P. Payre, Richard Mount, K. Moser, J. Nassalski, E. Boehm, Y. Declais, W. Flauger, A.M. Osborne, T. J. Sloan, G. Coignet, Ulrich Landgraf, M. Henckes, H. Minssieux, W.D. Dau, H. Pessard, H. E. Stier, R. Gamet, J.K. Davies, M.I. Ferrero, W. Stockhausen, J. J. Aubert, P.J. Hayman, X. De Bouard, E. Gabathuler, H. Forsbach, S.C. Brown, V. Gerhardt, J. Drees, Jennifer S. Haas, Uwe Pietrzyk, K.H. Becks, R. W. Clifft, Adam C. Schneider, Cristiana Peroni, A. W. Edwards, J.M. Thenard, P. R. Norton, K. Rith, Stephen Wimpenny, W.S.C. Williams, M. Whalley, G.R. Court, BOMBAR, Claudine, Laboratoire d'Annecy de Physique des Particules (LAPP), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS), Centre de Physique des Particules de Marseille (CPPM), Aix Marseille Université (AMU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and EMC

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Muon, Meson, [PHYS.HEXP] Physics [physics]/High Energy Physics - Experiment [hep-ex], 010308 nuclear & particles physics, Branching fraction, Hadron, Inelastic scattering, Deep inelastic scattering, 01 natural sciences, Nuclear physics, Pion, 0103 physical sciences, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], High Energy Physics::Experiment, Nuclear Experiment, 010306 general physics, Particle Physics - Experiment, Lepton
Abstract

Inclusive ϱ 0 meson production has been measured in 120 GeV and 280 GeV muon-proton interactions. Distributions of z and p T 2 are presented. Primary ϱ 0 production is found to be equal to that of π 0 production within errors.

Published
1983

10. The measurement of bethe-heitler bremsstrahlung in muon-hydrogen interactions at 200 gev

Author

D. Williams, Uwe Pietrzyk, Joshua Thompson, U. Dosselli, A. W. Edwards, J.M. Thenard, K. Moser, M. Schneegans, M. Whalley, P. R. Norton, F. Combley, M. Maire, H. Wahlen, G. D'Agostini, J. McNicholas, J.K. Davies, G.R. Court, M. Villers, A.M. Osborne, J. Favier, M.I. Ferrero, T. J. Sloan, Claus Goessling, H. Pessard, G. Coignet, J. J. Aubert, C. Broll, H.E. Montgomery, P.J. Hayman, Klaus Hamacher, X. De Bouard, H. Forsbach, V. Gerhardt, J. Gayler, H. E. Stier, S.C. Brown, V. Korbel, E. Gabathuler, F.W. Brasse, W.D. Dau, W. Flauger, W.S.C. Williams, Cristiana Peroni, C. Benchouk, J. Carr, S. J. Wimpenny, E. Nagy, J. Williamson, R. Gamet, M. C. Edwards, K.H. Becks, L. Urban, H. Minssieux, Ulrich Landgraf, R. W. Clifft, C. Best, J.H. Cobb, J. Nassalski, P. Payre, W. Stockhausen, M. Henckes, E. Boehm, Richard Mount, Jennifer S. Haas, K. Rith, Y. Declais, W. Mohr, G. Bassompierre, J. Dress, P. Gregory, M. Leenen, Laboratoire d'Annecy de Physique des Particules (LAPP), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS), Centre de Physique des Particules de Marseille (CPPM), Aix Marseille Université (AMU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), EMC, and BOMBAR, Claudine

Subjects
Physics, Particle physics, Muon, Photon, [PHYS.HEXP] Physics [physics]/High Energy Physics - Experiment [hep-ex], Physics and Astronomy (miscellaneous), Spectrometer, Physics::Instrumentation and Detectors, 010308 nuclear & particles physics, Detector, Bremsstrahlung, Emission theory, 01 natural sciences, Nuclear physics, Lead glass, visual_art, 0103 physical sciences, visual_art.visual_art_medium, Radiative transfer, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], Nuclear Experiment, 010306 general physics, Engineering (miscellaneous), Particle Physics - Experiment
Abstract

Using a lead glass detector installed in the EMC forward spectrometer radiative photons have been measured in 200 GeV muon-hydrogen collisions. The results are compared with the standard QED one photon emission theory of Mo and Tsai and also with the more recent predictions of a multiphoton emission theory of Chahine. We conclude that there is no evidence for any deviation from the standard theory, in terms of the yield and angular distribution of photons with fractional energy,z>0.7.

Published
1984

11. D0 production in deep inelastic muon scattering on hydrogen and deuterium

Author

D. Williams, J.H. Cobb, J.K. Davies, C. Broll, H.E. Montgomery, V. Korbel, M.I. Ferrero, J. Gayler, M. Leenen, K. Moser, V. Gerhardt, J. J. Aubert, Joshua Thompson, M. Villers, J. Carr, H. Wahlen, M. Schneegans, H. E. Stier, X. De Bouard, Claus Goessling, L. Urban, Stephen Wimpenny, G. D'Agostini, Uwe Pietrzyk, M. Whalley, J. Favier, E. Boehm, A. Schneider, J. Nassalski, Y. Declais, A. W. Edwards, J.M. Thenard, P.J. Hayman, J. Drees, A.M. Osborne, T. J. Sloan, H. Forsbach, P. R. Norton, Klaus Hamacher, S.C. Brown, R. Gamet, G.R. Court, C. Benchouk, J. Williamson, H. Pessard, W.D. Dau, E. Gabathuler, H. Minssieux, F.W. Brasse, C. Best, P. Payre, J. McNicholas, U. Dosselli, G. Bassompierre, K.H. Becks, F. Combley, M. Maire, Ulrich Landgraf, M. Henckes, J. Haas, W.S.C. Williams, W. Mohr, G. Coignet, R.P. Mount, W. Flauger, M. C. Edwards, Cristiana Peroni, K. Rith, W. Stockhausen, E. Nagy, R. W. Clifft, BOMBAR, Claudine, Centre de Physique des Particules de Marseille (CPPM), Aix Marseille Université (AMU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Laboratoire d'Annecy de Physique des Particules (LAPP), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS), and EMC

Subjects
Physics, Scattering cross-section, Nuclear and High Energy Physics, Particle physics, Muon, Hydrogen, [PHYS.HEXP] Physics [physics]/High Energy Physics - Experiment [hep-ex], 010308 nuclear & particles physics, Scattering, chemistry.chemical_element, Deep inelastic scattering, 01 natural sciences, Nuclear physics, Deuterium, chemistry, 0103 physical sciences, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], High Energy Physics::Experiment, Charm (quantum number), 010306 general physics, Nuclear Experiment, Particle Physics - Experiment
Abstract

Inclusive D 0 ( D 0 ) production in deep inelastic scattering of 280 GeV and 240 GeV muons on hydrogen and deuterium targets has been measured; differential cross sections are given and the total cross sections extrapolated to Q 2 = 0. They are compared with the results of photoproduction experiments and with measurements of the muoproduction of charm detected indirectly by multimuon events.

Published
1986

12. Observation of wrong-sign tri-muon events in 250 GeV muon-nucleon interactions

Author

M. Whalley, W. Stockhausen, H. Minssieux, P. Dalpiaz, M. Villers, P.F. Dalpiaz, Jennifer S. Haas, L. Urban, P. Payre, E. Böhm, J. J. Aubert, M. Leenen, Joshua Thompson, Cristiana Peroni, Claus Gössling, X. De Bouard, M. Schneegans, J. H. Cobb, J. M. Crespo, W. Mohr, E. Gabathuler, Klaus Hamacher, M.I. Ferrero, F.W. Brasse, R. W. Clifft, M. Henckes, V. Gerhardt, L. Massonnet, W.S.C. Williams, D. Williams, C. Broll, F. Combley, J.G. Williamson, A.M. Osborne, V. Korbel, W. Flauger, T. J. Sloan, J. Drees, Ulrich Landgraf, Richard Mount, J. Carr, S. C. Brown, G. Bassompierre, H. Pessard, P.J. Hayman, Y. Declais, R.W. Dobinson, G. Coignet, K.H. Becks, J. McNicholas, M. C. Edwards, R. Gamet, W. D. Dau, Stephen Wimpenny, K. Rith, U. Dosselli, G. D'Agostini, H. E. Stier, P. Gregory, H. Wahlen, J. K. Davies, C. Best, H.E. Montgomery, J. Gayler, J. Favier, K. Moser, Uwe Pietrzyk, A. W. Edwards, J.M. Thenard, P. Ghez, P. R. Norton, and M. Maire

Subjects
Physics, Nuclear physics, Nuclear and High Energy Physics, Particle physics, Pair production, Muon, Hadron, Charm (quantum number), Nucleon, Event (particle physics), Mixing (physics), Particle Physics - Experiment, Sign (mathematics)
Abstract

Two trimuon events of the type μ+N→μ+μ+μ+X and one μ+N→μ+μ−μ−X have been observed in 250 GeV μ+ -iron interactions. The expected rate from the decay of hadrons (charm, π, K) is about one event. Other processes that may contribute are both beauty production and charm production with D0−D0 mixing. The data give upper limits of 12×10−36 cm2 for the cross section of beauty pair production by muons, and 20% for D0 ↔ D0 transitions due to mixing, both at 90% confidence level.

Published
1981

13. Measurement of the proton structure function F$_{2}$ in muon-hydrogen interactions at 120 and 280 GeV

Author

U. Dosselli, G. Coignet, H. Jokisch, M. Edwards, M. Whalley, L. Urban, P. Ghez, Cristiana Peroni, E. Schlösser, M. Villers, P.F. Dalpiaz, J. McNicholas, P. Payre, W. Flauger, M. Henckes, J. Favier, G.R. Court, H. E. Stier, S.C. Brown, Stephen Wimpenny, C. Best, D. Williams, R. W. Clifft, J. J. Aubert, E. Böhm, J.G. Williamson, J.H. Cobb, A. W. Edwards, M. Leenen, J.M. Thenard, A.M. Osborne, F. Combley, X. De Bouard, M. Maire, T. J. Sloan, J. Drees, E. Gabathuler, P. R. Norton, H. Pessard, K. Moser, K.H. Becks, G.D. Agostini, G. Bassompierre, M. Schneegans, C. Broll, H.E. Montgomery, W. Mohr, J. Gayler, R. Gamet, P.J. Hayman, W.S.C. Williams, P. Gregory, Ulrich Landgraf, R.W. Dobinson, Richard Mount, Claus Gössling, J. M. Crespo, H. Wahlen, F.W. Brasse, Y. Declais, L. Massonnet, J.R. Holt, J. C. Thompson, J.K. Davies, Klaus Hamacher, M.I. Ferrero, V. Gerhardt, H. Minssieux, U. Hahn, V. Korbel, J. Carr, P. Dalpiaz, U. Pietrzyk, K. Rith, W. Stockhausen, Jennifer S. Haas, and W.D. Dau

Subjects
Physics, Quantum chromodynamics, Nuclear and High Energy Physics, Particle physics, Range (particle radiation), Muon, Proton, Hydrogen, Structure function, chemistry.chemical_element, Nuclear physics, chemistry, Scaling, Particle Physics - Experiment
Abstract

The proton structure function F2 has been measured in the range 2.5 {slanted equal to or less-than} Q2 {slanted equal to or less-than} 170 GeV2and 0.03 {slanted equal to or less-than} x {slanted equal to or less-than} 0.65. Scaling violation is clearly seen in the data. Results of fits to leading-order QCD are presented, together with values of the scale-breaking parameter λ. © 1981.

Published
1981

14. A comparison of proton, antiproton and meson distributions in final states of deep inelastic muon scattering

Author

F.W. Brasse, W.S.C. Williams, A.M. Osborne, T. J. Sloan, L. Urban, Uwe Pietrzyk, A. W. Edwards, J.M. Thenard, M. Leenen, P. R. Norton, W. Flauger, Joshua Thompson, R. W. Clifft, M. C. Edwards, Cristiana Peroni, M. Schneegans, H. E. Stier, Stephen Wimpenny, U. Dosselli, H. Forsbach, S.C. Brown, F. Combley, M. Maire, V. Korbel, W. Stockhausen, J. Favier, W. Mohr, H. Pessard, M. Villers, G. D'Agostini, P.J. Hayman, J. Carr, G. Coignet, Jennifer S. Haas, D. Williams, M. Henckes, Claus Goessling, Klaus Hamacher, M. Whalley, C. Benchouk, J. Nassalski, E. Nagy, J.H. Cobb, J. McNicholas, G.R. Court, R. Gamet, H. Minssieux, J.G. Williamson, J. J. Aubert, K. Rith, X. De Bouard, E. Gabathuler, C. Best, J. Drees, Ulrich Landgraf, W.D. Dau, G. Bassompierre, E. Boehm, K.H. Becks, P. Payre, Richard Mount, Y. Declais, K. Moser, J.K. Davies, M.I. Ferrero, V. Gerhardt, H. Wahlen, C. Broll, H.E. Montgomery, J. Gayler, Laboratoire d'Annecy de Physique des Particules (LAPP), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS), Centre de Physique des Particules de Marseille (CPPM), Aix Marseille Université (AMU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), EMC, and BOMBAR, Claudine

Subjects
Physics, Quark, Nuclear and High Energy Physics, Particle physics, Muon, [PHYS.HEXP] Physics [physics]/High Energy Physics - Experiment [hep-ex], Proton, Meson, 010308 nuclear & particles physics, High Energy Physics::Lattice, High Energy Physics::Phenomenology, Nuclear Theory, Jet (particle physics), 01 natural sciences, Gluon, Baryon, Nuclear physics, Antiproton, 0103 physical sciences, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], High Energy Physics::Experiment, 010306 general physics, Nuclear Experiment, Particle Physics - Experiment
Abstract

New results on the forward produced protons and antiprotons in high energy muon-nucleon scattering are presented. Their W 2 , z and p 2 T dependences are compared with those of the other charged hadrons. Significant differences are observed which can be related to the flavour content of the target and to a difference between the baryon content of quark and gluon jets.

Published
1984

15. Production of charmonium in 250 GeV μ +-iron interactions

Author

P. Payre, H. E. Stier, Claus Gössling, P. Gregory, F.W. Brasse, W.S.C. Williams, M. Leenen, J. M. Crespo, M. Whalley, K. Rith, J. McNicholas, J. Favier, D. Williams, M. Villers, P.F. Dalpiaz, Joshua Thompson, H. Pessard, L. Massonnet, J.H. Cobb, Klaus Hamacher, F. Combley, M. Maire, H. Wahlen, M. Henckes, H. Minssieux, M. Schneegans, K.H. Becks, R. W. Clifft, R. Gamet, G. D'Agostini, Uwe Pietrzyk, E. Böhm, J. Drees, A. W. Edwards, J.M. Thenard, P.J. Hayman, Cristiana Peroni, W. Flauger, Richard Mount, Stephen Wimpenny, P. Dalpiaz, P. R. Norton, J.K. Davies, K. Moser, M.I. Ferrero, Y. Declais, C. Broll, H.E. Montgomery, V. Gerhardt, V. Korbel, W. Mohr, R.W. Dobinson, J. Gayler, A.M. Osborne, T. J. Sloan, J. Carr, C. Best, S.C. Brown, Ulrich Landgraf, W.D. Dau, W. Stockhausen, Jennifer S. Haas, J.G. Williamson, J. J. Aubert, G. Bassompierre, X. De Bouard, E. Gabathuler, L. Urban, M. C. Edwards, U. Dosselli, and G. Coignet

Subjects
Physics, Quantum chromodynamics, Nuclear physics, Momentum, Nuclear and High Energy Physics, Cross section (physics), Muon, Distribution (mathematics), Branching fraction, Production (computer science), Particle Physics - Experiment, Gluon
Abstract

The production of J/ϑ and ϑ′ has been measured in 250 GeV muon iron interactions. The measured total cross sections are σ(μN → μJ/ϑX)=0.74±0.14 nb and σ(μN → μϑ′X)=0.16 ± 0.07 nb. An upper limit on the cross section times branching ratio for ϒ production of BR · σ (μN → μϒX) < 5.2 × 10−38 cm2 (at 90% confidence level) is obtained. About half the J/ϑ cross section is found to have Z ⩾ 0.95 (where Z=E(J/ϑ/ν). The first-order photon-gluon fusion model agrees well with the measured Q2 and ν dependence of the J/ϑ data and is used to extract the gluon momentum distribution. However, higher order QCD effects are needed to explain the Z distribution of the J/ϑ and the observed broadening of the Pt2 distribution with decreasing Z. The decay angular distributions of the J/ϑ are found to be flat in the s-channel frame, but there is evidence for polarisation in the t-channel frame.

Published
1983

16. MEASUREMENT OF THE DEUTERON STRUCTURE-FUNCTION F2(D) AND A COMPARISON OF PROTON AND NEUTRON STRUCTURE

Author

J.H. Cobb, M. Leenen, R. W. Clifft, Joshua Thompson, Richard Mount, M. Schneegans, Claus Goessling, G. D'Agostini, Y. Declais, J. Drees, Cristiana Peroni, J. Favier, R. Gamet, F. Combley, M. Maire, Klaus Hamacher, W.S.C. Williams, H. Pessard, W.D. Dau, E. Boehm, H. Wahlen, K.H. Becks, W. Stockhausen, P. Payre, K. Rith, S.C. Brown, Jennifer S. Haas, M. C. Edwards, W. Mohr, F.W. Brasse, A.M. Osborne, U. Dosselli, M. Whalley, J. McNicholas, T. J. Sloan, V. Korbel, K. Moser, P.J. Hayman, W. Flauger, J. J. Aubert, Ulrich Landgraf, G.R. Court, Stephen Wimpenny, J. Carr, G. Coignet, M. Henckes, X. De Bouard, J.K. Davies, M.I. Ferrero, E. Gabathuler, J. Best, V. Gerhardt, R.W. Dobinson, H. E. Stier, L. Urban, M. Villiers, J.G. Williamson, G. Bassompierre, H. Minssieux, Uwe Pietrzyk, A. W. Edwards, J.M. Thenard, P. R. Norton, C. Broll, H.E. Montgomery, J. Gayler, and D. Williams

Subjects
Nuclear physics, Physics, Nuclear and High Energy Physics, Proton, Deuterium, Structure function, Structure (category theory), Neutron, Particle Physics - Experiment
Abstract

The deuteron structure function F 2 d has been measured in 280 GeV μ + d interactions. Existing measurements of F 2 p , made with the same apparatus, are used to calculate F 2 p − F 2 n and F 2 n F 2 p . The ratio F 2 n F 2 p has a similar x dependence to that of earlier measurements at lower Q 2 .

Published
1983

17. Balance of transverse momentum of hadrons produced in deep inelastic muon-proton scattering

Author

C. Broll, E. Böhm, H.E. Montgomery, L. Urban, D. Williams, J.H. Cobb, P. Payre, J. Gayler, J. McNicholas, S.C. Brown, H. Forscbach, Claus Gössling, Cristiana Peroni, Richard Mount, M. C. Edwards, M. Henckes, R. Gamet, F.W. Brasse, J. Favier, P. Dalpiaz, M. Villers, P.F. Dalpiaz, Y. Declais, Klaus Hamacher, E. Nagy, F. Combley, M. Maire, C. Best, R. W. Clifft, Ulrich Landgraf, V. Korbel, M. Leenen, K. Moser, Joshua Thompson, Uwe Pietrzyk, Stephen Wimpenny, M. Schneegans, M. Whalley, A.M. Osborne, U. Dosselli, A. W. Edwards, T. J. Sloan, J.M. Thenard, K.H. Becks, H. Wahlen, H. Pessard, G. D'Agostini, P. R. Norton, G.R. Court, J.K. Davies, W.S.C. Williams, H. E. Stier, J. Carr, G. Bassompierre, M.I. Ferrero, P.J. Hayman, V. Gerhardt, J. Nassalski, P. Gregory, G. Coignet, H. Minssieux, W.D. Dau, W. Flauger, W. Stockhausen, Jennifer S. Haas, W. Mohr, J. Drees, K. Rith, R.W. Dobinson, J. J. Aubert, J. M. Crespo, L. Massonnet, X. De Bouard, E. Gabathuler, Centre de Physique des Particules de Marseille (CPPM), Aix Marseille Université (AMU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Laboratoire d'Annecy de Physique des Particules (LAPP), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS), EMC, and BOMBAR, Claudine

Subjects
Quantum chromodynamics, Physics, Nuclear and High Energy Physics, Particle physics, Muon, [PHYS.HEXP] Physics [physics]/High Energy Physics - Experiment [hep-ex], 010308 nuclear & particles physics, Scattering, High Energy Physics::Phenomenology, Elementary particle, Parton, Inelastic scattering, Deep inelastic scattering, 01 natural sciences, Gluon, Nuclear physics, 0103 physical sciences, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], High Energy Physics::Experiment, Nuclear Experiment, 010306 general physics, Particle Physics - Experiment
Abstract

Data are presented on the balance of transverse momenta of final state charged hadrons in 280 GeV muon-proton scattering. In particular the way in which the transverse momentum of either leading particles (z > 0.5) f high pT particles (pT2 > 2 GeV2) is compensated by further hadrons in the forward hemisphere is studied. The results are consistent with a QCD based model. The agreement is achieved by including in the model the emission of soft gluons and assuming that the partons have a distribution of primordial transverse momentum with 〈kT2〉 {reversed tilde equals} 0.2 GeV2, a value considerably less then found in previous analyses. © 1982.

Published
1982

18. Hadron production in 200 GeV $\mu$-copper and $\mu$-carbon deep inelastic interactions

Author

J. M. Crespo, E. Böhm, C. Best, M. Whalley, L. Massonnet, L. Urban, G.R. Court, M. Henckes, Claus Gössling, P. Payre, M. Villers, P.F. Dalpiaz, A.M. Osborne, T. J. Sloan, H. Forsbach, Richard Mount, H. Pessard, F.W. Brasse, K.H. Becks, J. Favier, J.G. Williamson, E. Gabathuler, A. Arvidson, S.C. Brown, Y. Declais, C. Broll, H.E. Montgomery, D. Williams, Klaus Hamacher, J. Gayler, K. Moser, M. Leenen, J.H. Cobb, G. Bassompierre, Cristiana Peroni, Joshua Thompson, R. Gamet, Uwe Pietrzyk, M. C. Edwards, A. W. Edwards, Stephen Wimpenny, M. Schneegans, J.M. Thenard, P.J. Hayman, U. Dosselli, J.K. Davies, P. R. Norton, M.I. Ferrero, J. J. Aubert, J. Nassalski, R.W. Dobinson, G. D'Agostini, V. Gerhardt, W.S.C. Williams, H. Wahlen, X. De Bouard, G. Coignet, V. Korbel, J. McNicholas, J. Carr, P. Dalpiaz, H. Minssieux, W. Stockhausen, Jennifer S. Haas, W.D. Dau, C. Benchouk, F. Combley, M. Maire, W. Mohr, E. Nagy, R. W. Clifft, W. Flauger, Ulrich Landgraf, H. E. Stier, P. Gregory, K. Rith, J. Drees, Laboratoire d'Annecy de Physique des Particules (LAPP), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS), Centre de Physique des Particules de Marseille (CPPM), Aix Marseille Université (AMU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), EMC, and BOMBAR, Claudine

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Muon, [PHYS.HEXP] Physics [physics]/High Energy Physics - Experiment [hep-ex], 010308 nuclear & particles physics, Scattering, Hadron, Absorption cross section, chemistry.chemical_element, Virtual particle, Parton, 7. Clean energy, 01 natural sciences, Copper, Nuclear physics, Fragmentation (mass spectrometry), chemistry, 0103 physical sciences, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], High Energy Physics::Experiment, 010306 general physics, Nuclear Experiment, Particle Physics - Experiment
Abstract

The measurements of the z and p T 2 distribution of hadrons produced in the interactions of 200 GeV muons with copper and carbon nuclei are shown in different x Bj and virtual photon energy intervals. Effects of the jet scattering are seen at the lowest virtual photon energies while for energies above 70 GeV there is no evidence of these effects. Comparison with a theoretical model indicates that at high jet energies the parton fragmentation distance is greater than the nuclear radius and that the parton absorption cross section is less than 10 mb.

Published
1984

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