Search for proton decay into e/sup +/. pi. /sup 0/

Journal Article · Mon Jul 04 04:00:00 EDT 1983 · Phys. Rev. Lett.; (United States)

DOI:https://doi.org/10.1103/PhysRevLett.51.27· OSTI ID:6046738

Bionta, R M; Blewitt, G; Bratton, C B

Observations were made 1570 meters of water equivalent underground with an 8000-metric-ton water Cherenkov detector. During a live time of 80 d no events consistent with the decay p..-->..e/sup +/..pi../sup 0/ were found in a fiducial mass of 3300 metric tons. It is concluded that the limit on the lifetime for bound plus free protons divided by the e/sup +/..pi../sup 0/ branching ratio is tau/B>6.5 x 10/sup 31/ yr; for free protons the limit is tau/B>1.9 x 10/sup 31/ yr (90% confidence). Observed cosmic-ray muons and neutrinos are compatible with expectations.

• Research Organization: The University of California at Irvine, Irvine, California 92717; The University of Michigan, Ann Arbor, Michigan 48109; Brookhaven National Laboratory, Upton, New York 11973; California Institute of Technology, Pasadena, California 91125; Cleveland State University, Cleveland, Ohio 44115; The University of Hawaii, Honolulu, Hawaii 96822; and University College, London WC1E6BT, United Kingdom
• OSTI ID: 6046738
• Journal Information: Phys. Rev. Lett.; (United States), Journal Name: Phys. Rev. Lett.; (United States) Vol. 51:1; ISSN PRLTA
• 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
ANTILEPTONS
ANTIMATTER
ANTIPARTICLES
BARYONS
BOSONS
CHERENKOV COUNTERS
DECAY
ELEMENTARY PARTICLES
FERMIONS
HADRONS
LEPTONS
LIFETIME
LIMITING VALUES
MEASURING INSTRUMENTS
MESONS
NUCLEONS
PARTICLE DECAY
PIONS
PIONS NEUTRAL
POSITRONS
PROTONS
PSEUDOSCALAR MESONS
RADIATION DETECTORS
SEMILEPTONIC DECAY
WEAK PARTICLE DECAY