Measurement of inclusive eta production in e/sup +/e/sup -/ interactions near charm threshold

Journal Article · Mon Sep 14 00:00:00 EDT 1981 · Phys. Rev. Lett.; (United States)

DOI:https://doi.org/10.1103/PhysRevLett.47.760· OSTI ID:6072024

Partridge, R; Peck, C; Porter, F C; Gu, Y F; Kollmann, W; Richardson, M; Strauch, K; Wacker, K; Aschman, D; Bagger, J; Burnett, T; Cavalli-Sforza, M; Coyne, D; Joy, M; Sadrozinski, H F.W.; Hofstadter, R; Horisberger, R; Kirkbride, I; Kolanoski, H; Koenigsmann, K ; Liberman, A; O'Reilly, J; Osterheld, A; Tompkins, J; Bloom, E; Bulos, F; Chestnut, R; Gaiser, J; Godfrey, G; Kiesling, C; Lockman, W; Oreglia, M

We have measured the inclusive cross section for eta production in e/sup +/e/sup -/ interactions near charm threshold using the Crystal Ball detector. No pronounced structure in the energy dependence is observed. By comparing cross sections above and below charm threshold we obtain the limits (90% confidence limit): R(e/sup +/e/sup -/..-->..FF-barX)Br(F..-->..etax) <0.15--0.32 (for E/sub c.m./ from 4.0 to 4.5 GeV), Br(D..-->..etax)<0.13 (averaged over charged and neutral D components of the psi''(3770) decays). Our results are inconsistent with a previous report of a large energy dependence of the eta cross section ascribed to the crossing the FF* and F*F* production thresholds.

• Research Organization: Physics Department, California Institute of Technology, Pasadena, California 91125
• OSTI ID: 6072024
• Journal Information: Phys. Rev. Lett.; (United States), Journal Name: Phys. Rev. Lett.; (United States) Vol. 47:11; ISSN PRLTA
• Country of Publication: United States
• Language: English

Related Subjects

645101* -- High Energy Physics-- Particle Interactions &amp; Properties-Experimental-- Electromagnetic Interactions &amp; Properties
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
BOSONS
CHARM PARTICLES
CHARMED MESON RESONANCES
CROSS SECTIONS
DATA
ELECTRODYNAMICS
ELECTROMAGNETIC RADIATION
ELECTRON-POSITRON INTERACTIONS
ELEMENTARY PARTICLES
ENERGY
ENERGY DEPENDENCE
ETA MESONS
EXPERIMENTAL DATA
FIELD THEORIES
GAMMA RADIATION
HADRONS
INCLUSIVE INTERACTIONS
INFORMATION
INTERACTIONS
IONIZING RADIATIONS
LEPTON-LEPTON INTERACTIONS
MESON RESONANCES
MESONS
MONTE CARLO METHOD
NUMERICAL DATA
PARTICLE INTERACTIONS
PARTICLE PRODUCTION
POSTULATED PARTICLES
PSEUDOSCALAR MESONS
QUANTUM ELECTRODYNAMICS
QUANTUM FIELD THEORY
RADIATIONS
RESONANCE PARTICLES
SPEAR
STORAGE RINGS
THRESHOLD ENERGY