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Titolo:
PRODUCTION OF PI-PLUS-OR-MINUS, K-PLUS-OR-MINUS, P, AND (P)BAR IN RELATIVISTIC AU+PT, SI+PT,AND P+PT COLLISIONS
Autore:
DIEBOLD GE; BASSALLECK B; BURGER T; BURGER M; CHRIEN R; ENYO H; FRANKLIN G; FRANZ J; IIJIMA T; IMAI K; LOWE J; MAGAHIZ R; MASAIKE A; MERRILL F; NELSON JM; OKADA K; PILE PH; QUINN B; ROSSLE E; RUSEK A; SAITO N; SAWAFTA R; SCHMITT H; SCHUMACHER RA; STEARNS RL; SUKATON R; SUTTER R; TAKEUTCHI F; WOLFE DM; YOKKAICHI S; ZEPS V; ZYBERT R;
Indirizzi:
UNIV BIRMINGHAM,DEPT PHYS BIRMINGHAM B15 2TT W MIDLANDS ENGLAND KYOTO UNIV,DEPT PHYS,SAKYO KU KYOTO 606 JAPAN BROOKHAVEN NATL LAB UPTON NY 11973 CARNEGIE MELLON UNIV,DEPT PHYS PITTSBURGH PA 15213 UNIV FREIBURG,FAK PHYS D-79104 FREIBURG GERMANY UNIV NEW S WALES KENSINGTON NSW 2033 AUSTRALIA KYOTO SANGYO UNIV,FAC SCI KYOTO 603 JAPAN VASSAR COLL,DEPT PHYS & ASTRON POUGHKEEPSIE NY 12601 YALE UNIV,DEPT PHYS NEW HAVEN CT 06511
Titolo Testata:
Physical review. C. Nuclear physics
fascicolo: 6, volume: 48, anno: 1993,
pagine: 2984 - 2994
SICI:
0556-2813(1993)48:6<2984:POPKPA>2.0.ZU;2-3
Fonte:
ISI
Lingua:
ENG
Soggetto:
ANTIPROTON PRODUCTION; NUCLEAR COLLISIONS; 14.6A GEV/C;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
19
Recensione:
Indirizzi per estratti:
Citazione:
G.E. Diebold et al., "PRODUCTION OF PI-PLUS-OR-MINUS, K-PLUS-OR-MINUS, P, AND (P)BAR IN RELATIVISTIC AU+PT, SI+PT,AND P+PT COLLISIONS", Physical review. C. Nuclear physics, 48(6), 1993, pp. 2984-2994

Abstract

During the recent commissioning of Au beams at the Brookhaven Alternating Gradient Synchrotron facility, experiment 886 measured productioncross sections for pi+/-, K+/-, p, and pBAR in minimum bias Au + Pt collisions at 11.5A GeV/c. Invariant differential cross sections, E d3sigma/dp3, were measured at several rigidities (p/Z less-than-or-equal-to 1.8 GeV/c) using a 5.7-degrees (fixed-angle) focusing spectrometer. For comparison, particle production was measured in minimum bias Si Pt collisions at 14.6A GeV/c using the same apparatus and in p + Pt collisions at 12.9 GeV/c using a similar spectrometer at KEK. When normalized to projectile mass, A(proj), the measured pi+/- and K+/- cross sections are nearly equal for the p + Pt and Si + Pt reactions. In contrast to this behavior, the pi- cross section measured in Au + Pt shows a significant excess beyond A(proj) scaling of the p + Pt measurement. This enhancement suggests collective phenomena contribute significantly to pi- production in the larger Au + Pt colliding system. For theAu + Pt reaction, the pi+ and K+ yields also exceed A(proj) scaling of p + Pt collisions. However, little significance can be attributed tothese excesses due to larger experimental uncertainties for the positive rigidity Au beam measurements. For antiprotons, the Si + Pt and Au+ Pt cross sections fall well below A(proj) scaling of the p + Pt yields indicating a substantial fraction of the nuclear projectile is ineffective for pBAR production. Comparing with p + Pt multiplicities, the Si + Pt and Au + Pt antiproton yields agree with that expected solely from ''first'' nucleon-nucleon collisions (i.e., collisions between previously unstruck nucleons). In light of expected pBAR annihilation in the colliding system, such projectile independence is unexpected without additional (projectile dependent) sources of pBAR production. Inthis case, the data indicate an approximate balance exists between absorption and additional sources of antiprotons. This balance is remarkable given the wide range of projectile mass spanned by these measurements.

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Documento generato il 27/11/20 alle ore 10:38:20