Nuclear medium effects on quarks, gluons, and on vector meson production: New insights from dimuon production
- Los Alamos National Lab., NM (USA)
- Fermi National Accelerator Lab., Batavia, IL (USA)
- Illinois Univ., Chicago, IL (USA)
- 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 Laboratory (LANL), Los Alamos, NM (United States)
- 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; TRN: 90-027595
- Resource Relation:
- Journal Volume: 522; Journal Issue: 1-2; Conference: Symposium in honor of Akito Arima: nuclear physics in the 1990's, Santa Fe, NM (USA), 1-5 May 1990
- Country of Publication:
- United States
- Language:
- English
Similar Records
A precision measurement of the A-dependence of dimuon production in proton-nucleus collisions at 800 GeV/c
A Precision Measurement of the A-Dependence of Dimuon Production in Proton - Nucleus Collisions at 800 GeV/C
Related Subjects
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
MUONS
PAIR PRODUCTION
BINDING ENERGY
CROSS SECTIONS
J PSI-3097 MESONS
QUARK-GLUON INTERACTIONS
STRUCTURE FUNCTIONS
TRANSVERSE MOMENTUM
VECTOR MESONS
BOSONS
CHARMONIUM
ELEMENTARY PARTICLES
ENERGY
FERMIONS
FUNCTIONS
HADRONS
INTERACTIONS
LEPTONS
LINEAR MOMENTUM
MESONS
PARTICLE INTERACTIONS
QUARKONIUM
645100* - High Energy Physics- Particle Interactions & Properties-Experimental
651000 - Nuclear Physics