Hadronic interactions with high transverse energy

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

OSTI ID:5115232

Stewart, Jr, D A

Properties of events produced with high values of transverse energy (E{sub T}) in 800 GeV/c proton-nucleus (pA) collisions are presented. The events were collected using the large acceptance Fermilab multiparticle spectrometer that detected particles containing nearly 95% of the available beam energy. Six nuclear targets (H, Be, C, Al, Cu, and Pb) were used to establish A-dependent trends in the data. High E{sub T} events were collected using both full-azimuth and limited aperture high E{sub T} triggers. The A-dependence of the cross sections at a given E{sub T} is parametrized as A{sup {alpha}}. The value of {alpha} increases from 0.7 at low E{sub T} to a plateau at high E{sub T} of approximately {alpha} {approx equal} 1.6. A strong dependence of {alpha} on the event structure is observed; events dominated by narrow jets of particles, expected to arise from hard scattering, exhibit an A-dependence consistent with {alpha} {approx equal} 1.0. Jet clusters are reconstructed using a standard jet-finding algorithm so that cross sections and event structures for single jet and dijet events can be measured. The pp data measurements are consistent with results from hard scattering experiments done at other energies. Nuclear effects in jet production are extracted from comparisons of pp and pA data. Jet structures in the pA data become less pronounced for heavier nuclei. Cross sections at a given jet transverse momentum (p{sub T}) or dijet E{sub T} are well described by the A{sup {alpha}} parametrization. Values of {alpha} for jet p{sub T} > 7 GeV/c or dijet E{sub T} > 15 GeV are consistent with {alpha} {approx equal} 1.6. This value of {alpha} indicates that a significant amount of jet rescattering occurs within the nucleus.

• Research Organization: Indiana State Univ., Terre Haute, IN (USA)
• OSTI ID: 5115232
• Resource Relation: Other Information: Thesis (Ph. D.)
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
PROTON-NUCLEON INTERACTIONS
NUCLEAR PROPERTIES
CALCULATION METHODS
EXPERIMENTAL DATA
HADRONS
MEASURING INSTRUMENTS
MEASURING METHODS
BARYON-BARYON INTERACTIONS
DATA
ELEMENTARY PARTICLES
HADRON-HADRON INTERACTIONS
INFORMATION
INTERACTIONS
NUCLEON-NUCLEON INTERACTIONS
NUMERICAL DATA
PARTICLE INTERACTIONS
400101* - Activation
Nuclear Reaction
Radiometric & Radiochemical Procedures
651100 - Nuclear Physics- Experimental Techniques- (1980-)
645100 - High Energy Physics- Particle Interactions & Properties-Experimental