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Measurement of the longitudinal structure function and the small x gluon density of the proton

Zeitschrift für Physik C Particles and Fields 39:2 (1988) 281-290

Authors:

AM Cooper-Sarkar, G Ingelman, KR Long, RG Roberts, DH Saxon

Abstract:

At HERA energies the small x region (x≲10-2) can be explored at Q2 values large enough that leading twist QCD calculations are valid. We show how measurement of the longitudinal structure function, FL(x,Q2), can lead to accurate measurement of the gluon structure function at such small x values. Experimental systematic errors are discussed fully and requirements for the measurement outlined. We conclude that it should be possible to distinguish between the widely varying gluon distributions which are currently allowed. © 1988 Springer-Verlag.
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Production of π0 mesons and charged hadrons in {Mathematical expression} neon and ν neon charged current interactions

Zeitschrift Fur Physik C Particles and Fields 40:2 (1988) 231-251

Authors:

W Wittek, M Aderholz, P Allport, N Armenise, JP Baton, M Berggren, FW Bullock, M Calicchio, EF Clayton, T Coghen, AM Cooper-Sarkar, O Erriquez, P Fitch, N Giannakopoulos, J Guy, E Hoffmann, PO Hulth, GT Jones, P Kasper, UF Katz, J Kern, H Klein, P Marage, E Matsinos, DRO Morrison, M Neveu, MA Parker, N Schmitz, E Simopoulou, K Varvell, A Vayaki, W Venus, H Wachsmuth

Abstract:

The average multiplicities of charged hadrons and of π+, π- and π0 mesons, produced in {Mathematical expression}Ne and νNe charged current interactions in the forward and backward hemispheres of the W±-nucleon center of mass system, are studied with data from BEBC. The dependence of the multiplicities on the hadronic mass (W) and on the laboratory rapidity (yLab) and the energy fraction (z) of the pion is also investigated. Special care is taken to determine the π0 multiplicity accurately. The ratio of average π multiplicities {Mathematical expression} is consistent with 1. In the backward hemisphere {Mathematical expression} is positively correlated with the charged multiplicity. This correlation, as well as differences in multiplicities between {Mathematical expression} and {Mathematical expression}, {Mathematical expression} scattering, is attributed to reinteractions inside the neon nucleus of the hadrons produced in the initial {Mathematical expression} interaction. © 1988 Springer-Verlag.
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Upper limits on charm-changing neutral-current interactions

Physical Review Letters American Physical Society (APS) 60:16 (1988) 1614-1617

Authors:

P Haas, M Hempstead, T Jensen, DR Johnson, H Kagan, R Kass, P Baringer, RL McIlwain, DH Miller, CR Ng, EI Shibata, S Behrends, Jan M Guida, Joan A Guida, F Morrow, R Poling, EH Thorndike, P Tipton, MS Alam, N Katayama, IJ Kim, WC Li, XC Lou, CR Sun, V Tanikella, D Bortoletto, M Goldberg, R Holmes, N Horwitz, A Jawahery, P Lubrano, GC Moneti, V Sharma, IPJ Shipsey, P Thoma, SE Csorna, T Letson, MD Mestayer, RS Panvini, GB Word, A Bean, GJ Bobbink, IC Brock, T Ferguson, RW Kraemer, H Vogel, C Bebek, K Berkelman, E Blucher, DG Cassel, T Copie, R DeSalvo, JW DeWire, R Ehrlich, RS Galik, MGD Gilchriese, B Gittelman, SW Gray, AM Halling, DL Hartill, BK Heltsley, S Holzner, J Kandaswamy, R Kowalewski, DL Kreinick, Y Kubota, NB Mistry, J Mueller, R Namjoshi, E Nordberg, D Perticone, D Peterson, M Pisharody, K Read, D Riley, A Silverman, S Stone, AJ Sadoff, P Avery, D Besson, L Garren, T Bowcock, K Kinoshita, FM Pipkin, M Procario, Richard Wilson, J Wolinski, D Xiao
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Charm production in nonresonant e+e- annihilations at √s =10.55 GeV

Physical Review D American Physical Society (APS) 37:7 (1988) 1719-1743

Authors:

D Bortoletto, M Goldberg, R Holmes, N Horwitz, A Jawahery, P Lubrano, GC Moneti, V Sharma, IPJ Shipsey, P Thoma, SE Csorna, T Letson, MD Mestayer, RS Panvini, GB Word, A Bean, GJ Bobbink, IC Brock, T Ferguson, RW Kraemer, H Vogel, C Bebek, K Berkelman, E Blucher, DG Cassel, T Copie, R DeSalvo, JW DeWire, R Ehrlich, RS Galik, MGD Gilchriese, B Gittelman, SW Gray, AM Halling, DL Hartill, BK Heltsley, S Holzner, J Kandaswamy, R Kowalewski, DL Kreinick, Y Kubota, NB Mistry, J Mueller, R Namjoshi, E Nordberg, D Perticone, D Peterson, M Pisharody, K Read, D Riley, A Silverman, S Stone, AJ Sadoff, P Avery, D Besson, L Garren, T Bowcock, K Kinoshita, FM Pipkin, M Procario, Richard Wilson, J Wolinski, D Xiao, P Haas, M Hempstead, T Jensen, DR Johnson, H Kagan, R Kass, P Baringer, RL McIlwain, DH Miller, EI Shibata, S Behrends, Jan M Guida, Joan A Guida, F Morrow, R Poling, EH Thorndike, P Tipton, MS Alam, N Katayama, IJ Kim, WC Li, XC Lou, CR Sun, V Tanikella
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Direct photon production in {Mathematical expression} in collisions at {Mathematical expression} GeV

Zeitschrift für Physik C Particles and Fields 41:3 (1988) 395-404

Authors:

R Ansari, P Bagnaia, M Banner, R Battiston, K Bernlöhr, C Booth, K Borer, M Borghini, G Carboni, V Cavasinni, P Cenci, JC Chollet, AG Clark, C Conta, C Corona, F Costantini, P Darriulat, B De Lotto, T Del Prete, L Di Lella, J Dines Hansen, K Einsweiler, L Fayard, R Ferrari, M Fraternali, D Froidevaux, JM Gaillard, O Gildemeister, VG Goggi, C Gössling, B Hahn, H Hänni, JR Hansen, P Hansen, K Hara, N Harnew, H Hugentobler, E Iacopini, L Iconomidou-Fayard, K Jakobs, P Jenni, EE Kluge, O Kofoed-Hansen, S Lami, E Lançon, P Lariccia, M Livan, S Loucatos, B Madsen, B Mansoulié, GC Mantovani, L Mapelli, K Meier, B Merkel, R Møllerud, M Moniez, R Moning, M Morganti, C Onions, T Pal, MA Parker, G Parrour, F Pastore, M Pepe, C Petridou, H Plothow-Besch, M Polverel, L Rasmussen, JP Repellin, A Roussarie, V Ruhlmann, G Sauvage, J Schacher, S Stapnes, F Stocker, M Swartz, J Teiger, WY Tsang, M Valdata-Nappi, V Vercesi, AR Weidberg, M Wunsch, H Zaccone

Abstract:

A measurement of the direct production of photons with high transverse momentum from {Mathematical expression} collisions at {Mathematical expression} GeV is presented. The structure of events containing a high transverse momentum photon is studied. The results support predictions from QCD theory. © 1988 Springer-Verlag.
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