Measurement of the photon structure function F/sub 2/(X,Q/sup 2/) in the range 0. 2 less than or equal to Q/sup 2/ < 7 GeV/sup 2/

Thesis/Dissertation · Wed Jan 01 04:00:00 EST 1986

OSTI ID:6902016

NcNeil, R R

The reaction ee ..-->.. ee + hadrons is studied with TPC/Two-Gamma detector at the PEP e/sup +/e/sup -/ storage ring at the Stanford Linear Accelerator Center. When one incoming electron is scattered through large enough angles to be detected, the process can be interpreted as inelastic e..gamma.. scattering. For small values of the scaling variable y, the reaction is described by the photon structure function F/sub 2/(x,Q/sup 2/) only. In this thesis results are presented for F/sub 2/(x,Q/sup 2/) in the range 0.2 less than or equal to Q/sup 2/ < 7 GeV/sup 2/ and W/sub vis/ > 1.0 GeV from 50 pb/sup -1/ of data collected by the PEP4-TPC/PEP9-Two Gamma collaboration during the 1982/1983 running period by requiring a single energy deposition in the forward calorimeters coincident with a particle measured in the central detector. The hadronic final state is identified by requiring detection of at least 3 particles in addition to the tagged electron. At least 2 charged tracks must measured in the Time Projection Chamber (TPC) or forward drift chambers and events consistent with an eeee final state are rejected. The data are corrected for detector affects by an unfolding procedure created by V. Blobel. A study is presented of the Q/sup 2/ evolution and final state topology of the data and the results will be used to extract F/sub 2/(x,Q/sup 2/). The results obtained is compared with the regularized higher order QCD calculation of Antoniadis and Grunberg, and ..lambda../sub QCD/ is determined in the MS scheme.

• Research Organization: California Univ., Davis (USA)
• OSTI ID: 6902016
• Country of Publication: United States
• Language: English

Related Subjects

645101* -- High Energy Physics-- Particle Interactions &amp; Properties-Experimental-- Electromagnetic Interactions &amp; Properties
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
DATA
ELECTRON-POSITRON INTERACTIONS
ELECTRONS
ELEMENTARY PARTICLES
ENERGY RANGE
EXPERIMENTAL DATA
FERMIONS
FIELD THEORIES
FOUR MOMENTUM TRANSFER
FUNCTIONS
GEV RANGE
GEV RANGE 10-100
HADRONS
INFORMATION
INTERACTIONS
LEPTON-LEPTON INTERACTIONS
LEPTONS
MASSLESS PARTICLES
MOMENTUM TRANSFER
MULTIPLE PRODUCTION
NUMERICAL DATA
PAIR PRODUCTION
PARTICLE INTERACTIONS
PARTICLE PRODUCTION
PEP STORAGE RINGS
PHOTONS
QUANTUM CHROMODYNAMICS
QUANTUM FIELD THEORY
STORAGE RINGS
STRUCTURE FUNCTIONS