Baryon-number violation at accelerator energies

Journal Article · Tue Nov 01 04:00:00 EST 1983 · Phys. Rev. D; (United States)

DOI:https://doi.org/10.1103/PhysRevD.28.2248· OSTI ID:5510434

Langacker, P; Sahdev, D

We study an SU/sub 5/ grand unified model with a stable proton. Proton stability is ensured by requiring that all interactions conserve a global quantum number chi called ''chromality'' and that the proton be the lightest particle to have chinot =0. Minimally implemented, these ideas require a doubling of fermions (conveniently labeled ''standard'' and ''exotic'') in each family and the introduction of a 5 and 45 of Higgs fields. The model may then have a relatively light color-triplet Higgs field h/sup ..cap alpha../, which can mediate the baryon-number-nonconserving decays of exotic fermions to the standard ones. We examine the phenomenology of the model and put bounds on the masses of the particles it postulates. In particular, we find that a color triplet h/sup ..cap alpha../ of mass m/sub h/> or approx. =10/sup 2/m/sub W/ is consistent with all the low-energy data currently available. This gives rise to the logical possibility of observing baryon-number-nonconserving events at accelerators, provided that the exotic fermions are light enough to be produced there. We study the production and decay of exotic fermions in planned e/sup +/e/sup -/ and p-barp facilities. We find that if they exist in the relevant mass range they could be produced in sufficient numbers (typically 10/sup 3/--10/sup 4/ exotic pairs per day at CERN LEP, the Stanford Linear Collider and Fermilab Tevatron I, and approx. =10/day at the CERN SPS) for the phenomenon of baryon-number violation to be observed. Other signatures include the decay of the exotic fermions a macroscopic distance from the production vertex and the presence of two high-energy charged leptons of the same sign among the decay products.

• Research Organization: Department of Physics, University of Pennsylvania, Philadelphia, Pennsylvania 19104
• OSTI ID: 5510434
• Journal Information: Phys. Rev. D; (United States), Journal Name: Phys. Rev. D; (United States) Vol. 28:9; ISSN PRVDA
• Country of Publication: United States
• Language: English

Related Subjects

645301* -- High Energy Physics-- Particle Invariance Principles & Symmetries-- General-- (-1987)
645400 -- High Energy Physics-- Field Theory
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
BARYON NUMBER
BARYON-BARYON INTERACTIONS
BARYONS
DECAY
ELECTRON-POSITRON INTERACTIONS
ELEMENTARY PARTICLES
EXOTIC RESONANCES
FERMIONS
HADRON-HADRON INTERACTIONS
HADRONS
HIGGS MODEL
INTERACTIONS
INVARIANCE PRINCIPLES
LEPTON-LEPTON INTERACTIONS
LEPTONS
LIE GROUPS
MATHEMATICAL MODELS
NUCLEON-ANTINUCLEON INTERACTIONS
NUCLEONS
PARTICLE DECAY
PARTICLE INTERACTIONS
PARTICLE MODELS
PARTICLE PRODUCTION
PROTON-ANTIPROTON INTERACTIONS
PROTONS
RESONANCE PARTICLES
STABILITY
SU GROUPS
SU-5 GROUPS
SYMMETRY GROUPS
UNIFIED GAUGE MODELS
WEAK PARTICLE DECAY