A study of the hadron production characteristics of the first excited states of charm mesons

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

OSTI ID:5465972

Zhang, Y

This thesis reports on a study of the production characteristics of the first excited states of the charged charm mesons (D{sup *{plus minus}}) measured by Fermilab experiment E653 in 800 GeV/c proton-emulsion ({bar A} = 25) interactions. It was found that the average value of the transverse momenta squared of the D{sup *{plus minus}}s is 0.93{sub {minus}0.09}{sup +0.10}{plus minus}0.10 (GeV/c){sup 2}, where the first error is the statistical error and the second one is systematic. With this parameterization and a MARK III measurement of BR(D{sup 0} {yields} K{sup {minus}} {plus} {mu}{sup {plus}} {plus} {nu}{sub {mu}}) {equals} 0.042 {plus minus} 0.014, the D{sup *{plus minus}} total cross section was estimated as 68 {plus minus} 30 (micro-bams) per proton-nucleon interaction, if a linear atomic number dependence of the total cross section was assumed. However, the observed Feynman x{sub F} distribution of the D{sup *{plus minus}}s might not be symmetric around x{sub F} {equals} 0. The significance of the asymmetry between the region {minus}0.06 {lt} x{sub F} {lt} 0 and 0 {lt} x{sub F} {lt} 0.06 was about 1.7 standard deviation in this charm sample. In x{sub F} {gt} {minus}0.05 region, which is well represented in this charm sample, and ignore the BR(D{sup 0} {yields} K{sup {minus}} {plus}{mu}{sup {plus}} {plus} {nu}{sub {mu}}) measurement, the proton-nucleon total cross section of D{sup *{plus minus}} (for x{sub F} {gt} {minus}0.05) times the D{sup 0} {yields} K{sup {minus}} {plus} {mu}{sup {plus}} {plus} v{sub {mu}} branching ratio was determined to be BR(D{sup 0} {yields} K{sup {minus}} {plus} {mu}{sup {plus}} {plus} {nu}{sub {mu}} ) {times} {sigma}{number sign}{number sign} {sup {plus minus}}(x{sub F} {gt} {minus}0.05) {equals} 2.6 {plus minus} 0.7({mu}b), under the linear A-dependence assumption.

• Research Organization: Carnegie-Mellon Univ., Pittsburgh, PA (United States)
• OSTI ID: 5465972
• 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
BARYONS
BOSONS
BRANCHING RATIO
CHARM PARTICLES
CHARMED MESONS
CROSS SECTIONS
DECAY
DIAGRAMS
ELEMENTARY PARTICLES
ENERGY LEVELS
ERRORS
EXCITED STATES
FERMIONS
FEYNMAN DIAGRAM
HADRON-HADRON INTERACTIONS
HADRONS
INTERACTIONS
LEPTONS
LIFETIME
LINEAR MOMENTUM
MASSLESS PARTICLES
MESONS
MUON NEUTRINOS
MUONS
NEUTRINOS
NUCLEON-NUCLEON INTERACTIONS
PARTICLE DECAY
PARTICLE INTERACTIONS
PARTICLE PRODUCTION
PROTON-NUCLEON INTERACTIONS
SEMILEPTONIC DECAY
TOTAL CROSS SECTIONS
TRANSVERSE MOMENTUM
WEAK PARTICLE DECAY