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Titolo:
Excess of continuum dimuon production at masses between threshold and the J/Psi in S-W interactions at 200 GeV/c/nucleon
Autore:
Angelis, ALS; Antos, J; Beaulieu, M; Beker, H; Bystricky, J; Catanesi, MG; Cerello, P; Dagan, S; Dellacasa, G; Di Liberto, S; Dolgoshein, B; Esten, M; Fabjan, CW; Gaidot, A; Gallio, M; Giubellino, P; Goerlach, U; Guerra, C; Hamel, LA; Konovalov, S; Kralik, I; London, G; Martelli, F; Martin, JP; Masera, M; Mazzoni, MA; Meddi, F; Muciaccia, MT; Muraviev, S; Nomerotsky, A; Oren, Y; Pansart, JP; Poulard, G; Ramello, L; Riccati, L; Rosa, G; Sandor, L; Sarris, M; Scomparin, E; Shmeleva, A; Simone, S; Smirnov, S; Taras, P; Urban, J; Vercellin, E;
Indirizzi:
CERN, CH-1211 Geneva, Switzerland CERN Geneva Switzerland CH-1211CERN, CH-1211 Geneva, Switzerland Univ Bari, Bari, Italy Univ Bari Bari ItalyUniv Bari, Bari, Italy Ist Nazl Fis Nucl, I-70126 Bari, Italy Ist Nazl Fis Nucl Bari Italy I-70126 Nazl Fis Nucl, I-70126 Bari, Italy Slovak Acad Sci, Kosice, Slovakia Slovak Acad Sci Kosice SlovakiaSlovak Acad Sci, Kosice, Slovakia Univ Montreal, Montreal, PQ, Canada Univ Montreal Montreal PQ CanadaUniv Montreal, Montreal, PQ, Canada PN Lebedev Phys Inst, Moscow 117924, Russia PN Lebedev Phys Inst Moscow Russia 117924 ys Inst, Moscow 117924, Russia Inst Phys & Engn, Moscow, Russia Inst Phys & Engn Moscow RussiaInst Phys & Engn, Moscow, Russia Ist Nazl Fis Nucl, Rome, Italy Ist Nazl Fis Nucl Rome ItalyIst Nazl Fis Nucl, Rome, Italy Univ Rome La Sapienza, Rome, Italy Univ Rome La Sapienza Rome ItalyUniv Rome La Sapienza, Rome, Italy Ctr Etud Saclay, DAPNIA, F-91191 Gif Sur Yvette, France Ctr Etud Saclay Gif Sur Yvette France F-91191 191 Gif Sur Yvette, France Univ Turin, Turin, Italy Univ Turin Turin ItalyUniv Turin, Turin, Italy Ist Nazl Fis Nucl, I-10125 Turin, Italy Ist Nazl Fis Nucl Turin Italy I-10125 azl Fis Nucl, I-10125 Turin, Italy McGill Univ, Montreal, PQ, Canada McGill Univ Montreal PQ CanadaMcGill Univ, Montreal, PQ, Canada Univ Athens, GR-10679 Athens, Greece Univ Athens Athens Greece GR-10679Univ Athens, GR-10679 Athens, Greece Univ Coll London, London, England Univ Coll London London EnglandUniv Coll London, London, England
Titolo Testata:
EUROPEAN PHYSICAL JOURNAL C
fascicolo: 3, volume: 13, anno: 2000,
pagine: 433 - 452
SICI:
1434-6044(200004)13:3<433:EOCDPA>2.0.ZU;2-V
Fonte:
ISI
Lingua:
ENG
Soggetto:
HEAVY-ION COLLISIONS; LEPTON-PAIR PRODUCTION; SUPER PROTON SYNCHROTRON; ULTRARELATIVISTIC NUCLEAR COLLISIONS; ZONE INTRANUCLEAR CASCADE; HADRON PHASE-TRANSITION; DUAL PARTON MODEL; S+AU COLLISIONS; DILEPTON EMISSION; AU COLLISIONS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
78
Recensione:
Indirizzi per estratti:
Indirizzo: Angelis, ALS CERN, CH-1211 Geneva, Switzerland CERN Geneva Switzerland CH-1211 CH-1211 Geneva, Switzerland
Citazione:
A.L.S. Angelis et al., "Excess of continuum dimuon production at masses between threshold and the J/Psi in S-W interactions at 200 GeV/c/nucleon", EUR PHY J C, 13(3), 2000, pp. 433-452

Abstract

Results are presented on dimuon production for invariant masses ranging from the dimuon threshold up to the J/Psi meson. Proton-tungsten and sulphur-tungsten interactions at 200 GeV/c/nucleon were measured over a large kinematic region, using the HELIOS/3 dimuon spectrometer at the CERN SPS. In thecontinuum regions between the dimuon threshold and the rho/omega mesons, and between the phi and J/Psi mesons, an excess is observed in S-W interactions relative to minimum bias p-W interactions. The observed excess is continuous over the explored mass range and has no apparent resonant structure. In the low mass region the dimuon yield increases by (76 +/- 4)% of the corresponding p-W dimuon spectrum, whereas in the higher mass region the excess amounts to 2.4 +/- 0.3 times the p-W yield. The observed excess for the low mass region follows an exponential transverse mass distribution with an average inverse slope parameter T of (190 +/- 5) MeV/c(2), constant for allbut the lowest charged multiplicity interval and consistent with the slopeof the excess in the higher mass region. In the invariant mass range of 1.35-2.5 GeV/c(2) the continuum dimuon mass distribution observed in p-W interactions can be quantitatively understood as a sum of three expected contributions (vector meson decays, semileptonic charm decays and Drell-Yan process), but both in central and in minimum bias S-W interactions an excess is observed with respect to these sources which does not depend on centrality,nor very strongly on the transverse momentum.

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Documento generato il 05/12/20 alle ore 16:49:26