Nuclear medium effects on quarks, gluons, and on vector meson production: New insights from dimuon production

Conference · Mon Jan 01 04:00:00 EST 1990

DOI:https://doi.org/10.1016/0375-9474(91)90067-G· OSTI ID:7039776

Leitch, M J; Alde, D M; Baer, H W; Carey, T A; Garvey, G T; Klein, A; Lee, C; Lillberg, J W; McGaughey, P L; Mishra, C S; Moss, J M; Peng, J C ^[1]; Brown, C N; Cooper, W E; Hsiung, Y B ^[2]; Adams, M R ^[3]; Guo, R; Kaplan, D M ^[4]; McCarthy, R

---

1. Los Alamos National Lab., NM (USA)
2. Fermi National Accelerator Lab., Batavia, IL (USA)
3. Illinois Univ., Chicago, IL (USA)
4. Northern Illinois Univ., Dekalb, IL (USA)

A precise measurement of the atomic mass dependence of dimuon continuum and vector-meson production induced by 800 GeV/c protons is reported. Approximately 700,000 muon pairs with dimuon mass M {ge} 3 GeV were recorded from targets of {sup 2}H, C, Ca, Fe, and W. The ratio of Drell-Yan dimuon yield per nucleon for nuclei versus {sup 2}H, R = Y{sub A}/Y{sub 2H}, is sensitive to modifications of the antiquark sea in nuclei. No nuclear dependence of this ratio is observed over the range of target-quark momentum fraction 0.1 < x{sub t} < 0.3. For x{sub t} < 0.1 the ratio is slightly less than unity for the heavy nuclei. These results are compared with predictions of models of the EMC effect. A depletion of the yield per nucleon from heavy nuclei is observed for the J{Psi}, {Psi}{prime}, and {Upsilon} production. This depletion exhibits strong dependence on x{sub f} and p{sub t}. 25 refs., 19 figs., 1 tab.

• Research Organization: Los Alamos National Lab., NM (USA)
• Sponsoring Organization: DOE/ER
• DOE Contract Number: W-7405-ENG-36
• OSTI ID: 7039776
• Report Number(s): LA-UR-90-2108; CONF-9005238--1; ON: DE90013160
• Country of Publication: United States
• Language: English

Related Subjects

645100* -- High Energy Physics-- Particle Interactions &amp; Properties-Experimental
651000 -- Nuclear Physics
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
BINDING ENERGY
BOSONS
CHARMONIUM
CROSS SECTIONS
ELEMENTARY PARTICLES
ENERGY
FERMIONS
FUNCTIONS
HADRONS
INTERACTIONS
J PSI-3097 MESONS
LEPTONS
LINEAR MOMENTUM
MESONS
MUONS
PAIR PRODUCTION
PARTICLE INTERACTIONS
QUARK-GLUON INTERACTIONS
QUARKONIUM
STRUCTURE FUNCTIONS
TRANSVERSE MOMENTUM
VECTOR MESONS