Jet production in photon-photon collisions at PEP

Thesis/Dissertation · Fri Jan 01 00:00:00 EST 1988

OSTI ID:7103311

Zeitlin, C J

The inclusive process {gamma}{gamma} {yields} hadrons has been studied in e{sup +}e{sup {minus}} collisions at the Stanford Linear Accelerator storage ring PEP, using the TPC/Two-Gamma detector facility. The flux of bremsstrahlung photons from the incoming e{sup +} and e{sup {minus}} is calculable in Quantum Electrodynamics, allowing one to extract {gamma}{gamma} cross sections and other information according to {sigma}{sub ee{yields}eeX} = L{sigma}{sub {gamma}{gamma}{yields}X} where the luminosity function L describes the flux of virtual photons. In this thesis, the author will present a study of the jet structure of {gamma}{gamma} events where one of the outgoing e{sup {plus minus}} was detected in the small-angle spectrometer, meaning that the corresponding photon was substantially off its mass shell. The total cross section for {gamma}{gamma} production of hadrons has been measured as a function of both the invariant mass of the tagged photon (Q{sup 2}) and the {gamma}{gamma} center-of-mass energy W, in the range 0.2 < Q{sup 2} < 6.8 GeV{sup 2} and 2 < W < 10 GeV. The cross section measurement is an outgrowth of a study of the related quantity F{sub 2}{sup {gamma}}, the photon structure function. The cross section results are used as the input for the 2-jet models used in the jet analysis, in which thrust and sphericity are used to reconstruct the jet axis and measure p{sub T}{sup jet}. The excess of high-p{sub T} events seen in other experiments is confirmed, and other features of the data are shown to be consistent with multi-jet production. The data are compared to absolute predictions from QCD-based models where the structure function used in the hard scattering approximation is varied.

• Research Organization: California Univ., Davis, CA (USA)
• OSTI ID: 7103311
• Resource Relation: Other Information: Thesis (Ph. D.)
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
HADRONS
PRODUCTION
CALCULATION METHODS
CROSS SECTIONS
DATA ANALYSIS
EXPERIMENTAL DATA
JET MODEL
MEASURING INSTRUMENTS
MEASURING METHODS
PEP STORAGE RINGS
PHOTON-PHOTON INTERACTIONS
QUANTUM CHROMODYNAMICS
BASIC INTERACTIONS
DATA
ELECTROMAGNETIC INTERACTIONS
ELEMENTARY PARTICLES
FIELD THEORIES
INFORMATION
INTERACTIONS
MATHEMATICAL MODELS
NUMERICAL DATA
PARTICLE INTERACTIONS
PARTICLE MODELS
QUANTUM FIELD THEORY
STORAGE RINGS
645000* - High Energy Physics
645103 - High Energy Physics- Particle Interactions &amp; Properties-Experimental- Strong Interactions &amp; Baryon &amp; Meson Properties