A measurement of the photon-structure function with probing Q sup 2 = 20 GeV sup 2 using the TPC/Two-Gamma detector facility at the Stanford Linear Accelerator Center

Thesis/Dissertation · Fri Jan 01 04:00:00 EST 1988

OSTI ID:7188134

Steinman, J S

The TPC/Two-Gamma detector facility has been used to measure the photon structure function F{sub 2}{sup {gamma}}(x, Q{sup 2}) for the hadronic process e{sup {minus}} e{sup +} {yields} e{sup {minus}}e{sup +}X in the range 8 GeV{sup 2} < Q{sup 2} < 55 GeV{sup 2}. The analysis used 322 multihadron events obtained from a luminosity of 69 pb{sup {minus}1}. The data have been corrected for detector effects by two methods. Event-by-event corrections to the visible two-photon mass are made based on physical constraints. Then, an unfolding procedure is used to globally correct for detector smearing effects. The structure function is compared with two theoretical models. The Regularized QCD Model yields a fitted value for {Lambda}{sub MS} = 585 + 186 {minus} 154 MeV. The P{sub t} cutoff model as prescribed by Field et al. fits the measured structure function very well using the recommended cutoff parameter t{sub 0} = 1.5 GeV. The results of this measurement are shown to be consistent with other world measurements.

• Research Organization: California Univ., Los Angeles, CA (USA)
• OSTI ID: 7188134
• Country of Publication: United States
• Language: English

Related Subjects

645000 -- High Energy Physics
645103* -- High Energy Physics-- Particle Interactions &amp; Properties-Experimental-- Strong Interactions &amp; Baryon &amp; Meson Properties
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
CALCULATION METHODS
DATA
DATA ANALYSIS
ELEMENTARY PARTICLES
EXPERIMENTAL DATA
FIELD THEORIES
FUNCTIONS
HADRON REACTIONS
INFORMATION
MASSLESS PARTICLES
MEASURING INSTRUMENTS
MEASURING METHODS
NATIONAL ORGANIZATIONS
NUCLEAR REACTIONS
NUMERICAL DATA
PHOTONS
QUANTUM CHROMODYNAMICS
QUANTUM FIELD THEORY
STANFORD LINEAR ACCELERATOR CENTER
STRUCTURE FUNCTIONS
THEORETICAL DATA
US DOE
US ERDA
US ORGANIZATIONS