Measurement of the strong coupling constant. alpha. sub s from jet production in W yields e. nu. events

Thesis/Dissertation · Mon Jan 01 04:00:00 EST 1990

OSTI ID:7277568

Lindgren, M A

The strong coupling constant {alpha}{sub s} has been measured from the rate of jet production observed in W events collected by the UA1 detector from proton-antiproton collisions at {radical}s = 630 GeV at the CERN collider. W bosons are to a first approximation produced by quark-antiquark annihilation at the CERN p{bar p} collider. Strong interactions led to hadronic jets emitted with the W. To first order the rate of jet production is proportional to the strong coupling constant. Experimental and theoretical difficulties make the determination of {alpha}{sub s} more complicated. The ratio of the number of W events observed with one jet to the number of W events with no jet was measured. This result was then compared to a QCD predicted ratio which was a function of the strong coupling constant. The QCD predicted ratio was calculated using the EKS and ISAJET Monte Carlos in conjunction with a full simulation of the UA1 detector. The value of {alpha}{sub s} was varied until the experimental and predicted ratios were equal. The value of {alpha}{sub s} was found to be {alpha}{sub s} = .127 {plus minus} 0.26(stat.) {plus minus} 0.22(exp. syst.) {plus minus} 0.25(theor.syst.).

• Research Organization: California Univ., Riverside, CA (United States)
• OSTI ID: 7277568
• Country of Publication: United States
• Language: English

Related Subjects

662340 -- Hadron Interactions-- (1992-)
662380* -- Decays of Intermediate Bosons-- (1992-)
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ANNIHILATION
BARYON-BARYON INTERACTIONS
BASIC INTERACTIONS
BOSONS
COMPARATIVE EVALUATIONS
COUPLING CONSTANTS
DECAY
ELECTROMAGNETIC INTERACTIONS
ELEMENTARY PARTICLES
EVALUATION
FIELD THEORIES
HADRON-HADRON INTERACTIONS
INTERACTIONS
INTERMEDIATE BOSONS
INTERMEDIATE VECTOR BOSONS
JET MODEL
LEPTONIC DECAY
MATHEMATICAL MODELS
MEASURING METHODS
NUCLEON-ANTINUCLEON INTERACTIONS
PARTICLE DECAY
PARTICLE INTERACTIONS
PARTICLE MODELS
PARTICLE PRODUCTION
PROTON-ANTIPROTON INTERACTIONS
QUANTUM CHROMODYNAMICS
QUANTUM FIELD THEORY
QUARK-ANTIQUARK INTERACTIONS
STRONG INTERACTIONS
W MINUS BOSONS
W PLUS BOSONS
WEAK INTERACTIONS
WEAK PARTICLE DECAY