Comparison of dimuon production by 125 GeV/c anti p and. pi. /sup -/ with predictions of the Drell-Yan model

Conference · Sat Jan 01 04:00:00 EST 1983

OSTI ID:6368130

Cox, B

The measurements of dimuon production (M > GeV/c/sup 2/) by 125 GeV/c anti p and ..pi../sup -/ performed by Fermilab Experiment 537 are compared to the predictions of the Drell-Yan model in this report. We find that the naive Drell-Yan cross sections calculated using CDHS and NA3 structure functions are too low by factors of 2.25 +- 0.45 and 2.50 +- 0.50 to reproduce the levels of our anti p and ..pi../sup -/ cross sections respectively. The shapes of the dsigma/dx/sub F/ and M/sup 3/ dsigma/dM differential cross sections are well reproduced by the naive zeroth order formula. The shape of the dsigma/dp/sub T/ cross section for the dimuons as measured by E-537 can be fit using the Alterelli, Parisi, and Petronzio O(..cap alpha../sub s/) prescription for calculating P/sub T/ distributions but requires < k/sub T//sup 2/ > of the interacting constituents of the nucleons and pion of 0.88 (GeV/c)/sup 2/. This < k/sub T//sup 2/ > is larger than the /sub ..pi../ = 0.59 +- 0.05 (GeV/c)/sup 2/ and < k/sub T//sup 2/>/sub P/ = 0.52 +- 0.05 (GeV/c)/sup 2/ obtained from the linear extrapolations of the s variation of the < P/sub T//sup 2/> of the experimentally observed dsigma/dp/sub T/ distributions to s-O. This implies that first order QCD in the formalism of Altarelli, Parisi, and Petronzio is insufficient to explain < P/sub T//sup 2/ > of the data.

• Research Organization: Fermi National Accelerator Lab., Batavia, IL (USA)
• DOE Contract Number: AC02-76CH03000
• OSTI ID: 6368130
• Report Number(s): FERMILAB-Conf-83/13-EXP; CONF-8210107-2; ON: DE83007136
• Country of Publication: United States
• Language: English

Related Subjects

645101* -- High Energy Physics-- Particle Interactions &amp; Properties-Experimental-- Electromagnetic Interactions &amp; Properties
645202 -- High Energy Physics-- Particle Interactions &amp; Properties-Theoretical-- Electromagnetic Interactions &amp; Properties
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ANNIHILATION
ANTINUCLEON REACTIONS
ANTIPROTON REACTIONS
BARYON REACTIONS
BASIC INTERACTIONS
CROSS SECTIONS
DIFFERENTIAL CROSS SECTIONS
DRELL MODEL
ELECTROMAGNETIC INTERACTIONS
ELEMENTARY PARTICLES
ENERGY RANGE
FIELD THEORIES
GEV RANGE
GEV RANGE 100-1000
HADRON REACTIONS
HADRON-HADRON INTERACTIONS
INTERACTIONS
MESON-BARYON INTERACTIONS
MESON-NUCLEON INTERACTIONS
MUON PAIRS
NUCLEAR REACTIONS
NUCLEON REACTIONS
PAIR PRODUCTION
PARTICLE INTERACTIONS
PION MINUS-NEUTRON INTERACTIONS
PION MINUS-PROTON INTERACTIONS
PION-NEUTRON INTERACTIONS
PION-NUCLEON INTERACTIONS
PION-PROTON INTERACTIONS
POSTULATED PARTICLES
QUANTUM CHROMODYNAMICS
QUANTUM FIELD THEORY
QUARKS