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Constraints on Isospin Breaking in the Light Quark Sea from the Drell-Yan Process

Technical Report ·
DOI:https://doi.org/10.2172/6255475· OSTI ID:6255475
 [1];  [2]
  1. Univ. of Washington, Seattle, WA (United States)
  2. Durham Univ. (United Kingdom)
+ Show Author Affiliations
One possible interpretation of recent deep inelastic scattering data applied to the Gottfried sum rule is that SU(2) isospin symmetry is violated in the light quark sea in the proton, i.e., $$\bar{u}≠\bar{d}$$. The data can equally well be described by retaining SU(2) symmetry but postponing the onset of Regge behavior to much smaller x values than are currently samples experimentally. We show how the Drell-Yan process can provide definitive, discriminating information on this issue. We suggest a new Drell-Yan experiment, which should prove decisive, and show how existing data may already rule out the isospin-breaking hypothesis.
Research Organization:
Univ. of Washington, Seattle, WA (United States)
Sponsoring Organization:
USDOE
DOE Contract Number:
AS06-88ER40423
OSTI ID:
6255475
Report Number(s):
DOE/ER/40423--22; ON: DE91009611
Country of Publication:
United States
Language:
English

References (9)

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Nuclear dependence of dimuon production at 800 GeV journal May 1990
Dimuon production in 800-GeV proton-nucleus collisions journal December 1989
Quark elastic scattering as a source of high-transverse-momentum mesons journal May 1977
On the QCD evolution of the spin structure function of the proton journal March 1990
Supercollider physics journal October 1984
Sum Rule for High-Energy Electron-Proton Scattering journal June 1967
Parton distributions extracted from data on deep-inelastic lepton scattering, prompt photon production, and the Drell-Yan process journal August 1990
Flavour symmetry breaking in antiquark distributions journal March 1979

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Related Subjects

645200* -- High Energy Physics-- Particle Interactions & Properties-Theoretical
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
BARYON-BARYON INTERACTIONS
DEEP INELASTIC SCATTERING
DRELL MODEL
EQUATIONS
HADRON-HADRON INTERACTIONS
INELASTIC SCATTERING
INTERACTIONS
ISOSPIN
LEPTON-BARYON INTERACTIONS
LEPTON-HADRON INTERACTIONS
LEPTON-NUCLEON INTERACTIONS
LIE GROUPS
MATTER
NUCLEON-NUCLEON INTERACTIONS
PARTICLE INTERACTIONS
PARTICLE PROPERTIES
PARTICLE RAPIDITY
PROTON-NEUTRON INTERACTIONS
PROTON-NUCLEON INTERACTIONS
QUARK MATTER
SCATTERING
SU GROUPS
SU-2 GROUPS
SUM RULES
SYMMETRY BREAKING
SYMMETRY GROUPS