Beam-jet structures in soft and hard proton-proton collisions at. sqrt. s = 27. 4 GeV

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

OSTI ID:6214121

Ahn, S C

Data were taken using Fermilab Multiparticle Spectrometer triggered by a highly segmented calorimeter with delta phi = 2..pi.. and 45/sup 0/ less than or equal to Theta less than or equal to 125/sup 0/. The study of soft and hard collisions is done by scanning transverse energy (E/sub t/) in the calorimeter from 1 to 20 GeV whose corresponding x/sub T/(=E/sub t//..sqrt..s) ranges from 0.05 to 0.7. They find: for high E/sub t/(> 8 GeV) events, excessively soft beam fragmentation compared to the prediction of ISAJET model: E/sub t/ scaling of beam fragmentation for negative particles and its violation for positive ones: at high E/sub t/, E/sub t/ scaling of beam fragmentation for both charges, and the approximately constant ratio ( = 1.73 +/- 0.15) of the beam fragmentation function of positive particle to that of negative ones at large x'(=2P/sub z/*/(..sqrt..-e/sub t/)): disappearance of the leading proton effect in the beam jet core. By comparison to nu(anti nu)p data, they demonstrate a transition from diquark to single quark nature of the beam remnant, which amounts to the breakdown of 4-jet structure in high E/sub t/ pp-collision; this breakdown is qualitatively consistent with multiple pairs of 2 ..-->.. 2 subprocesses. Also studied are correlations of 90/sup 0/ jet and the beam jet using the planarity as a measure of 90/sup 0/ jet.

• Research Organization: Rutgers--the State Univ., New Brunswick, NJ (USA)
• OSTI ID: 6214121
• Country of Publication: United States
• Language: English

Related Subjects

645103* -- High Energy Physics-- Particle Interactions & Properties-Experimental-- Strong Interactions & Baryon & Meson Properties
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ACCELERATORS
BARYON-BARYON INTERACTIONS
CORRELATIONS
CROSS SECTIONS
CYCLIC ACCELERATORS
DATA
ELEMENTARY PARTICLES
ENERGY DEPENDENCE
ENERGY RANGE
EXPERIMENTAL DATA
FERMILAB ACCELERATOR
GEV RANGE
GEV RANGE 10-100
HADRON-HADRON INTERACTIONS
HADRONS
HYPOTHESIS
INFORMATION
INTERACTIONS
JET MODEL
LEADING PARTICLES
LIMITING FRAGMENTATION
LINEAR MOMENTUM
MATHEMATICAL MODELS
MULTIPLE PRODUCTION
NUCLEON-NUCLEON INTERACTIONS
NUMERICAL DATA
PARTICLE INTERACTIONS
PARTICLE MODELS
PARTICLE PRODUCTION
PROTON-NUCLEON INTERACTIONS
PROTON-PROTON INTERACTIONS
SYNCHROTRONS
TRANSVERSE MOMENTUM