Tests of models for e[sup +]e[sup [minus]] annihilation into hadrons and leptons

Thesis/Dissertation · Fri Jan 01 04:00:00 EST 1993

OSTI ID:7161371

Kumita, T

This thesis reports on tests of various gauge group models using data observed by the AMY detector at the TRISTAN e[sup +]e[sup [minus]] collider. Results are presented of total hadronic cross section for e[sup +]e[sup [minus]] [yields] hadrons at 50 GeV [<=] [radical]s [<=] 64 GeV for an integrated luminosity of [integral] Ldt = 95.5pb[sup [minus]1], and total cross sections and forward-backward asymmetries for e[sup +]e[sup [minus]] [yields] [mu][sup +][mu][sup [minus]] and e[sup +]e[sup [minus]] [yields] [tau][sup +][tau][sup [minus]] processes at 52 Gev [<=] [radical]s [<=] 61.4 GeV for [integral] Ldt = 32.6pb[sup [minus]1]. The author examines models of extra Z bosons, E[sub 6], SU(5)[sub c], and SU(2)[sub q] x SU(2)[sub t] by fitting to these data and data from other e[sup +]e[sup [minus]] experiments together. It was determined that the QCD scale parameter by fitting the total hadronic cross sections for all e[sup +]e[sup [minus]] data at 20 [<=] [radical]s [<=] 64 GeV to the formula to O([alpha][sup 3][sub s]) and obtained [Lambda](5)/MS = 0.533[sup +0.521+0.020][sub [minus]0.334[minus]0.029][+-]0.09 GeV. This result is high but consistent with the world average of [Lambda](5)/MS = 0.175[sup +0.041][sub [minus]0.034] within errors.

• Research Organization: Rochester Univ., NY (United States)
• OSTI ID: 7161371
• Country of Publication: United States
• Language: English

Related Subjects

662310* -- Weak &amp; Electromagnetic Interactions of Leptons-- (1992-)
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ANNIHILATION
BASIC INTERACTIONS
COLLISIONS
CROSS SECTIONS
ELECTROMAGNETIC INTERACTIONS
ELECTRON COLLISIONS
ELECTRON-POSITRON COLLISIONS
ELEMENTARY PARTICLES
ENERGY RANGE
FERMIONS
FIELD THEORIES
GEV RANGE
GEV RANGE 10-100
HADRONS
HEAVY LEPTONS
INTERACTIONS
LEPTONS
MATHEMATICAL MODELS
MUONS
PARTICLE INTERACTIONS
PARTICLE MODELS
POSITRON COLLISIONS
POSTULATED PARTICLES
QUANTUM CHROMODYNAMICS
QUANTUM FIELD THEORY
STORAGE RINGS
TAU PARTICLES
TOTAL CROSS SECTIONS
TRISTAN STORAGE RINGS