Ratio of Branching Fractions for ${\chi }_{cJ}\to \gamma J/\psi$

Abstract

One important quarkonia result from the Tevatron experiments is the ratio of direct inclusive production of χ_{c1} to χ_{c2}, which is most readily measured using χ_{cJ}\toγJ/ψdecays. This note uses CLEO publications to obtain a ratio of these radiative branching fractions, {\cal B}(χ_{c1}\toγJ/ψ)/{\cal B}(χ_{c2}\toγJ/ψ) = 1.91 \pm 0.10, using cancelation in systematic uncertainties not available in the Particle Data Group listings.

3 pages, including title page; no figures