First results from DELCO at PEP
Preliminary results from DELCO are presented on several topics which utilize the particle identification capabilities of the detector: (1) we measure the Cabbibo angle in tau decays to be tan/sup 2/ theta/sub c/ = 0.08 +- 0.03 +- 0.04; (2) in the intermediate x (p/E/sub BEAM/) range, 0.2 < x < 0.55, the fraction of ..pi../sup + -/ relative to all charged particles is found to be approximately 60% and to show only a weak energy dependence; and (3) we observe a large D*/sup + -/ cross section ratio, R/sub D*/sup + -// = sigma(e/sup +/e/sup -/ ..-->.. D*/sup + -/X)/sigma/sub ..mu mu../ = 2.0 +- 0.6 +- 0.7 in the z (E/sub D*//E/sub BEAM/) range above 0.3. In contrast with the lighter quarks, the fragmentation of charmed quarks occurs predominantly at large values of z; we measure = 0.6 +- 0.1.
- Research Organization:
- California Inst. of Tech., Pasadena (USA); Stanford Linear Accelerator Center, CA (USA); Stanford Univ., CA (USA)
- DOE Contract Number:
- AC03-76SF00515
- OSTI ID:
- 6368198
- Report Number(s):
- SLAC-PUB-2981; CONF-820718-30; ON: DE83007005
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
645100* -- High Energy Physics-- Particle Interactions & Properties-Experimental
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
BOSONS
CABIBBO ANGLE
CHARM PARTICLES
CHARMED MESON RESONANCES
CHERENKOV COUNTERS
CROSS SECTIONS
D RESONANCES
DATA
DECAY
ELEMENTARY PARTICLES
ENERGY RANGE
EXPERIMENTAL DATA
FERMIONS
FRAGMENTATION
GEV RANGE
GEV RANGE 01-10
GEV RANGE 10-100
HADRONS
HEAVY LEPTONS
INFORMATION
INTERACTIONS
LEPTONS
MEASURING INSTRUMENTS
MESON RESONANCES
MESONS
NUMERICAL DATA
PAIR PRODUCTION
PARTICLE DECAY
PEP STORAGE RINGS
PIONS
POSTULATED PARTICLES
PSEUDOSCALAR MESONS
RADIATION DETECTORS
RESONANCE PARTICLES
STORAGE RINGS
TAU PARTICLES
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
BOSONS
CABIBBO ANGLE
CHARM PARTICLES
CHARMED MESON RESONANCES
CHERENKOV COUNTERS
CROSS SECTIONS
D RESONANCES
DATA
DECAY
ELEMENTARY PARTICLES
ENERGY RANGE
EXPERIMENTAL DATA
FERMIONS
FRAGMENTATION
GEV RANGE
GEV RANGE 01-10
GEV RANGE 10-100
HADRONS
HEAVY LEPTONS
INFORMATION
INTERACTIONS
LEPTONS
MEASURING INSTRUMENTS
MESON RESONANCES
MESONS
NUMERICAL DATA
PAIR PRODUCTION
PARTICLE DECAY
PEP STORAGE RINGS
PIONS
POSTULATED PARTICLES
PSEUDOSCALAR MESONS
RADIATION DETECTORS
RESONANCE PARTICLES
STORAGE RINGS
TAU PARTICLES