Inclusive D meson production with the Mark II detector at SPEAR

Thesis/Dissertation · Tue Jan 01 04:00:00 EST 1980

OSTI ID:5959449

Coles, M W

Neutral and charged D meson production cross sections were measured at center of mass energies between 3.9 GeV and 7.4 GeV. The quantity R/sub D/ (= (sigma/sub (D + D- + sigma/sub (D/sup 0/ - anti D/sup 0/))/2 sigma/sub ..mu../sup +/..mu../sup -//) is equal to 2 at 4 GeV and 4.4 GeV and about equal to 1 elsewhere. R/sub D/ + 2.5 approximately equals R(sigma/sub hadrons/sigma/sub ..mu../sup +/..mu../sup -//) at all energies. The exclusive cross section for e/sup +/e/sup -/ annihilation into D anti D, D*anti D, and D*anti D* were measured at center of mass energies between 3.9 GeV and 4.3 GeV sigma/sub D*anti D*/ decreases with increasing center of mass energy from 6.6 +- 1.3 nb near 4 GeV to 3.6 +- .9 nb near 4.3 GeV. Sigma/sub D*anti D*/ also decreases from 4.2 +- .9 nb to 1.8 +- .6 nb over the same energy region. Sigma/sub D anti D/ is less than 0.5 +- .3 nb at all energies. The branching fractions for D*/sup +/ and D* were measured. At 5.2 GeV, the D meson differential cross section is well described by phase space for e/sup +/e/sup -/ ..-->.. D anti D..pi pi.. or D*anti D*..pi pi... Sd sigma/dz was parameterized as A(l-z)/sup n/ with n = 0.9 +- .4. Quasi-two-body production accounts for less than 20% of the total D cross section. No evidence was found for associated charmed baryon-D meson production. An upper limit of 0.4 nb (90% confidence level) was determined for associated production.

• Research Organization: California Univ., Berkeley (USA)
• OSTI ID: 5959449
• Country of Publication: United States
• Language: English

Related Subjects

645101* -- High Energy Physics-- Particle Interactions & Properties-Experimental-- Electromagnetic Interactions & Properties
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ANNIHILATION
ANTIMATTER
ANTIPARTICLES
BASIC INTERACTIONS
BOSONS
CHARM PARTICLES
CHARMED MESON RESONANCES
CROSS SECTIONS
D RESONANCES
D-2007 RESONANCES
DECAY
ELECTROMAGNETIC INTERACTIONS
ELECTRON-POSITRON INTERACTIONS
ELEMENTARY PARTICLES
ENERGY RANGE
GEV RANGE
GEV RANGE 01-10
HADRONS
INTERACTIONS
LEPTON-LEPTON INTERACTIONS
MESON RESONANCES
MESONS
PARTICLE DECAY
PARTICLE INTERACTIONS
PARTICLE PRODUCTION
POSTULATED PARTICLES
RESONANCE PARTICLES
SPEAR
STORAGE RINGS