Charm photoproduction at 20 GeV including preliminary lifetime results with improved optical resolution

Conference · Sun Jul 01 04:00:00 EDT 1984

OSTI ID:7098257

Colley, D C; Brick, D; Bacon, T C; Cohn, H O; Franek, B; Armenteros, R; Abe, K; Kafka, T; Bingham, H H; Brau, J E

Sixty five charm events have been observed in an exposure, during 1983, of the SLAC Hybrid Facility (SHF) to a backward scattered laser beam. Preliminary results for the charmed meson lifetimes have been obtained based on 19 neutral and 22 charged decays thereby doubling our earlier data. These lifetimes are consistent with our published results and the two data samples have been combined. From the resulting 42 neutral, 45 charged and 13 topologically ambiguous decays the charmed meson lifetimes are measured to be tau/sub D/sup 0// = (6.4/sub -0.9//sup +1.1/ +- 0.5) x 10/sup -13/s and tau/sub D/sup + -// = (8.2/sub -1.1//sup +1.3/ +- 0.6) x 10/sup -13/s and their ratio tau/sub D//sup + -///tau/sub D/sup 0// = 1.3/sub -0.3/sup +0.5/. The inclusive charm cross-section at a photon energy of 20 GeV has been measured to be 60 +- 8 +- 21) nb.

• Research Organization: Birmingham Univ. (UK); Brown Univ., Providence, RI (USA); Imperial Coll. of Science and Technology, London (UK); Oak Ridge National Lab., TN (USA); Rutherford Appleton Lab., Chilton (UK); Stanford Linear Accelerator Center, CA (USA); Tohoku Univ., Sendai (Japan); Tufts Univ., Medford, MA (USA); California Univ., Berkeley (USA); Tennessee Univ., Knoxville (USA)
• DOE Contract Number: AC03-76SF00515
• OSTI ID: 7098257
• Report Number(s): SLAC-PUB-3372; CONF-840757-2; ON: DE84014336
• 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
BACKSCATTERING
BASIC INTERACTIONS
BOSONS
BUBBLE CHAMBERS
CHARM PARTICLES
CHARMED MESON RESONANCES
CROSS SECTIONS
D RESONANCES
D-1865 RESONANCES
DATA
DECAY
ELECTROMAGNETIC INTERACTIONS
ELECTROMAGNETIC RADIATION
ELEMENTARY PARTICLES
ENERGY RANGE
EXPERIMENTAL DATA
GAS TRACK DETECTORS
GEV RANGE
GEV RANGE 10-100
HADRONS
INFORMATION
INTERACTIONS
LASER RADIATION
LIFETIME
MEASURING INSTRUMENTS
MESON RESONANCES
MESONS
MULTIWIRE PROPORTIONAL CHAMBERS
NUMERICAL DATA
PARTICLE DECAY
PARTICLE INTERACTIONS
PARTICLE PRODUCTION
PHOTON-BARYON INTERACTIONS
PHOTON-HADRON INTERACTIONS
PHOTON-NUCLEON INTERACTIONS
PHOTON-PROTON INTERACTIONS
PHOTOPRODUCTION
POSTULATED PARTICLES
PROPORTIONAL COUNTERS
RADIATION DETECTORS
RADIATIONS
RESONANCE PARTICLES
SCATTERING