Production characteristics of neutral and charged D mesons in 800-Gev p-emulsion interactions

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

OSTI ID:7103312

Mokhtarani, A

New results from experiment 653 at FNAL are presented. Invariant mass distributions of neutral and charged D mesons in the exclusive decay mode of D{sup 0} {yields} K{pi} and D{sup {plus minus}} {yields} K{sup {pi}{pi}} are obtained using the information from the electronic portion of the spectrometer. A study of transverse momentum distribution of the background subtracted events shows good agreement with other experiments. The results of a maximum likelihood fit of the form dN/dP{sub T}{sup 2} = e{sup {minus}PT2} to the data gives b = 1.29{plus minus}{sub .20}{sup .22}(Gev/c){sup {minus}2} with = 840 {plus minus} 95 Mev/c. The longitudinal momentum distribution, however, indicates a highly central production of charm particles at 800 Gev proton-nuclei collision. A maximum likelihood fit of the form dN/dx{sub F} = (1 - x{sub F}){sup n} to our data gives n = 14-16. This is in contrast to the leading particle effects (n {le} 4), where a valence quark from the incident particles leads a charm quark from the sea resulting in a charmed particle with large longitudinal momentum. The total cross section for the charm sample was calculated to be {sigma}(D) = 102{plus minus}{sub 18}{sup 21} {plus minus} 23 {mu}b with 32{plus minus}{sub 8}{sup 0} {plus minus} 11 {mu}b+ and 70{plus minus}{sub 16}{sup 19} {plus minus} 20 {mu}b for the charged and neutral D mesons, respectively.

• Research Organization: California Univ., Davis, CA (USA)
• OSTI ID: 7103312
• Country of Publication: United States
• Language: English

Related Subjects

645000* -- High Energy Physics
645103 -- High Energy Physics-- Particle Interactions & Properties-Experimental-- Strong Interactions & Baryon & Meson Properties
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
BOSONS
CALCULATION METHODS
CHARM PARTICLES
CHARMED MESONS
CHARMONIUM
CROSS SECTIONS
D MESONS
DATA
DATA ANALYSIS
ELEMENTARY PARTICLES
EXPERIMENTAL DATA
HADRONS
INFORMATION
MEASURING INSTRUMENTS
MEASURING METHODS
MESONS
NUMERICAL DATA
PRODUCTION
PSEUDOSCALAR MESONS
QUARKONIUM