D-meson hadroproduction in 800-GeV/c p-p interactions

Thesis/Dissertation · Sun Jan 01 04:00:00 EST 1989

OSTI ID:6136401

Mendez, G E

The characteristics of D meson hadroproduction in 800 GeV/C proton-proton collisions have been measured. Comparisons have been made with 400 GeV/c pp data and with theoretical predictions of the QCD fusion model using two different c {yields} D fragmentation processes. The data was obtained from experiment E743 which was carried out at Fermilab. A liquid hydrogen bubble chamber (LEBC) served both as target and high resolution vertex detector. The multiparticle spectrometer (MPS) was used for momentum determination and particle identification. A total of 1.2 million bubble chamber pictures were taken using an interaction trigger. They were scanned three times in order to select the charm candidates. The average charge multiplicity for interactions in which charm particles are produced is (n{sub ch}) = 12.5 +/- 0.8. The total D meson production cross section was calculated to be {sigma}(D/D) = 44 +/-{sup 10}{sub 8} {mu}b for all X{sub F}. The differential cross section was found to be well described by the form: d2{sigma}/dX{sub F}d{sub pT{sup 2}} {proportional to} (1-{vert bar}X{sub F}{vert bar}){sup n}e{sup {minus}bp}T{sup 2}, with n = 9.0{sup +2.6}{sub {minus}2.3} and b = 0.80 {plus minus} 0.14. The average values of X{sub f} (for X{sub F} > 0.) and p{sub T} were (x{sub F}) = .090 +/- .020 and (p{sub T}) = .96 +/- .13 GeV/c. The cross section results are consistent with QCD predictions using next to leading order calculations with a charm mass of about 1.5 GeV/c{sup 2}. The shapes of the differential cross section distributions are described well by the QCD calculations. Both Lund and delta-function c {yields} D fragmentation schemes were used in these calculations. Both describe the date adequately. Only flavor creation QCD subprocesses are needed to describe the E743 data. Flavor excitation and intrinsic charm are not necessary.

• Research Organization: Duke Univ., Durham, NC (USA)
• OSTI ID: 6136401
• 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
BARYON-BARYON INTERACTIONS
BOSONS
BUBBLE CHAMBERS
CHARM PARTICLES
CHARMED MESONS
COMPARATIVE EVALUATIONS
COMPOSITE MODELS
CROSS SECTIONS
D MESONS
DECAY
ELEMENTARY PARTICLES
ENERGY RANGE
FERMIONS
FIELD THEORIES
FLAVOR MODEL
GAS TRACK DETECTORS
GEV RANGE
HADRON-HADRON INTERACTIONS
HADRONS
INTERACTIONS
MASS
MATHEMATICAL MODELS
MEASURING INSTRUMENTS
MESONS
NUCLEON-NUCLEON INTERACTIONS
PARTICLE DECAY
PARTICLE IDENTIFICATION
PARTICLE INTERACTIONS
PARTICLE MODELS
PARTICLE PRODUCTION
POSTULATED PARTICLES
PROTON-NUCLEON INTERACTIONS
PROTON-PROTON INTERACTIONS
PSEUDOSCALAR MESONS
QUANTUM CHROMODYNAMICS
QUANTUM FIELD THEORY
QUARK MODEL
QUARKS
RADIATION DETECTORS