Mark III results from SPEAR

Technical Report · Tue Nov 01 04:00:00 EST 1983

DOI:https://doi.org/10.2172/5343141· OSTI ID:5343141

Toki, W

First results from the MARK III detector at SPEAR are presented based on 2.7 million J/psi decays. The eta/sub c/ is observed in three modes, J/psi ..-->.. ..gamma..eta/sub c/, (eta/sub c/ ..-->.. rho anti rho, eta..pi../sup +/..pi../sup -/, and phi phi). Using the phi phi mode, the eta/sub c/ spin-parity is determined to be 0/sup -/. The known radiative J/psi decays J/psi ..-->.. ..gamma..f(f ..-->.. ..pi../sup +/..pi../sup -/), ..gamma..eta'(eta' ..-->.. ..gamma..rho/sup 0/, eta..pi../sup +/..pi../sup -/), ..gamma..f'(f' ..-->.. kappa/sup +/kappa/sup -/), ..gamma..theta(theta ..-->.. kappa anti kappa), and ..gamma..iota(iota ..-->.. ..pi..kappa anti kappa) are observed and their branching ratios found to be in agreement with previous measurements. In the J/psi ..-->.. ..gamma..kappa/sup +/kappa/sup -/ mode a new state is observed at 2.22 GeV and in the J/psi ..-->.. ..gamma gamma..rho/sup 0/ and ..gamma..eta..pi../sup +/..pi../sup -/ modes evidence for new structures near 1.4 GeV is presented. 29 references.

• Research Organization: Stanford Linear Accelerator Center, CA (USA)
• DOE Contract Number: AC03-81ER40050
• OSTI ID: 5343141
• Report Number(s): SLAC-PUB-3262; CONF-8307109-4; ON: DE84005326
• Country of Publication: United States
• Language: English

Related Subjects

645102* -- High Energy Physics-- Particle Interactions & Properties-Experimental-- Weak Interactions & Properties
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ACCELERATOR FACILITIES
BOSONS
BRANCHING RATIO
DATA
DECAY
DRIFT CHAMBERS
ELEMENTARY PARTICLES
EXPERIMENTAL DATA
GLUEBALLS
GLUONS
HADRONS
INFORMATION
KAONS
KAONS MINUS
KAONS PLUS
MAGNETIC SPECTROMETERS
MASS
MEASURING INSTRUMENTS
MESON RESONANCES
MESONS
MULTIWIRE PROPORTIONAL CHAMBERS
NUMERICAL DATA
PARTICLE DECAY
PARTICLE PROPERTIES
PARTICLE WIDTHS
PIONS
PIONS MINUS
PIONS PLUS
POSTULATED PARTICLES
PROPORTIONAL COUNTERS
PSEUDOSCALAR MESONS
PSI RESONANCES
PSI-3105 RESONANCES
RADIATION DETECTORS
RADIATIVE DECAY
RESONANCE PARTICLES
REST MASS
SHOWER COUNTERS
SPEAR
SPECTROMETERS
STORAGE RINGS
STRANGE PARTICLES
VECTOR MESONS
WEAK PARTICLE DECAY