New information on parton distributions

Journal Article · Mon Feb 01 04:00:00 EST 1993 · Physical Review, D (Particles Fields); (United States)

DOI:https://doi.org/10.1103/PhysRevD.47.867· OSTI ID:6890606

Martin, A D; Stirling, W J ^[1]; Roberts, R G ^[2]

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1. Department of Physics, University of Durham, Durham DH1 3LE (United Kingdom)
2. Rutherford Appleton Laboratory, Chilton, Didcot OX11 0QX (United Kingdom)

New data on structure functions from deep-inelastic scattering provide new information on parton distributions, particularly in the 0.01[lt][ital x][lt]0.1 interval. This has important implications for predictions for the DESY [ital ep] collider HERA and for present and future high-energy hadron colliders. We present the results of updated fits to all available precision structure function and related data. We focus in particular on two issues: (a) the increase in the sea-quark distribution at small [ital x] implied by new [ital F][sub 2] data from the New Muon Collaboration, and its implications for other processes, and (b) the evidence for SU(2)-symmetry breaking in the light-quark sea. We show that although good fits can be obtained with or without this symmetry breaking, more physically reasonable parton distributions are obtained if we allow [ital [bar d]][gt][ital [bar u]] at small [ital x]. With the inclusion of the latest deep-inelastic data we find [alpha][sub [ital s]]([ital M][sub [ital Z]])=0.111[sub [minus]0.005][sup +0.004]. We also show how [ital W], [ital Z], and Drell-Yan production at [ital [bar p]p] colliders can give information on parton distributions.

• OSTI ID: 6890606
• Journal Information: Physical Review, D (Particles Fields); (United States), Journal Name: Physical Review, D (Particles Fields); (United States) Vol. 47:3; ISSN PRVDAQ; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

662120* -- General Theory of Particles & Fields-- Symmetry
Conservation Laws
Currents & Their Properties-- (1992-)
662230 -- Quantum Chromodynamics-- (1992-)
662240 -- Models for Strong Interactions-- (1992-)
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ACCELERATORS
BARYON-BARYON INTERACTIONS
BOSONS
CYCLIC ACCELERATORS
DEEP INELASTIC SCATTERING
DESY
DISTRIBUTION FUNCTIONS
DRELL MODEL
ELECTRON-NUCLEON INTERACTIONS
ELECTRON-PROTON INTERACTIONS
ELEMENTARY PARTICLES
FIELD THEORIES
FUNCTIONS
GLUONS
HADRON-HADRON INTERACTIONS
HERA STORAGE RING
INELASTIC SCATTERING
INTERACTIONS
INTERMEDIATE BOSONS
INTERMEDIATE VECTOR BOSONS
LEPTON-BARYON INTERACTIONS
LEPTON-HADRON INTERACTIONS
LEPTON-NUCLEON INTERACTIONS
LIE GROUPS
MATTER
NUCLEON-ANTINUCLEON INTERACTIONS
PARTICLE INTERACTIONS
PARTONS
POSTULATED PARTICLES
PROTON-ANTIPROTON INTERACTIONS
QUANTUM CHROMODYNAMICS
QUANTUM FIELD THEORY
QUARK MATTER
SCATTERING
STORAGE RINGS
STRUCTURE FUNCTIONS
SU GROUPS
SU-2 GROUPS
SYMMETRY BREAKING
SYMMETRY GROUPS
SYNCHROTRONS
W MINUS BOSONS
W PLUS BOSONS
Z NEUTRAL BOSONS