A Quantum Chromodynamic parton model study of events triggered by identified charged particles with large transverse momenta in proton-proton collisions at the CERN intersecting storage ring facility

Thesis/Dissertation · Thu Jan 01 04:00:00 EST 1987

OSTI ID:5015121

Yeung, R Y.M.

An experiment triggering on single high P{sub t} {pi}{sup +}, {pi}{sup {minus}}, K{sup +}, K{sup {minus}}, p, and p in proton-proton collisions has been performed by the Ames-Bologna-CERN-Dortmund-Heidelberg-Warsaw collaboration using the Split-Field-Magnet detector at the CERN-ISR. The parton model based on Quantum Chromodynamics is compared to the observed events. The single particle inclusive cross sections for center-of-mass energies up to {radical}S = 62 GeV at trigger polar angles {Theta} {approx} 45{degree} and 90{degree} are accurately predicted by the parton model calculations. A program using the Monte Carlo method to simulate complete events is subsequently developed. The importance sampling technique is applied to enhance the efficiency in the fixed-angle high P{sub t} trigger. The simulated events are compared to the data. Events triggered by {pi}{sup +}, {pi}{sup {minus}}, K{sup +}, and K{sup {minus}} mesons of P{sub t} > 4 GeV/c and polar angle {theta} {approx} 45{degree} at the highest ISR energy {radical}S = 62 GeV are used. Detailed analyses on the transverse and the longitudinal directions of the trigger jet, in addition to the correlations between the trigger and the spectator jets show excellent agreement between the parton model predictions and the data. However, a similar study on the away side demonstrates the necessity of higher-order QCD corrections. Encouraging improvements on the away side are observed when the higher-order QCD corrections are implemented in the parton model using the LLA parton shower formalism. Thus, the effects of higher-order QCD corrections are shown to be important in deep inelastic hadronic processes.

• Research Organization: California Univ., Los Angeles, CA (USA)
• OSTI ID: 5015121
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400101 -- Activation
Nuclear Reaction
Radiometric & Radiochemical Procedures
645000 -- High Energy Physics
645100* -- High Energy Physics-- Particle Interactions & Properties-Experimental
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
BARYON-BARYON INTERACTIONS
CERN ISR
DATA
ENERGY RANGE
EXPERIMENTAL DATA
FIELD THEORIES
GEV RANGE
GEV RANGE 10-100
HADRON-HADRON INTERACTIONS
INFORMATION
INTERACTIONS
MEASURING INSTRUMENTS
MEASURING METHODS
NUCLEON-NUCLEON INTERACTIONS
NUMERICAL DATA
PARTICLE INTERACTIONS
PROTON-NUCLEON INTERACTIONS
PROTON-PROTON INTERACTIONS
QUANTUM CHROMODYNAMICS
QUANTUM FIELD THEORY
STORAGE RINGS