Inclusive Radiative $J/ψ$ Decays

Details Inclusive Radiative $J/ψ$ Decays Inclusive Radiative $J/ψ$ Decays

2008-06-02

arxiv.org/abs/0806.0315v1

Phys.Rev.D78:032012,2008

Physics

High Energy Physics

High Energy Physics - Experiment

Scientific paper

10.1103/PhysRevD.78.032012

Using data taken with the CLEO-c detector at the Cornell Electron Storage Ring, we have investigated the direct photon momentum spectrum in the decay J/psi->gamma+gluon+gluon, via the 'tagged' process: e+e- -> psi(2S); psi(2S)->J/psi pi+pi-; J/psi->photon + X. Including contributions from two-body radiative decay processes, we find the ratio of the inclusive direct photon branching fraction to that of the dominant three-gluon branching fraction to be R=0.137+/-0.001+/-0.016+/-0.004, where the errors shown are statistical, systematic, and the model-dependent uncertainty related to the extrapolation to zero photon energy. The shape of the scaled photon energy spectrum in J/psi->gg gamma is observed to be very similar to that of Upsilon(1S)->gg gamma. The R value obtained is roughly consistent with that expected by a simple quark-charge scaling of the value determined at the Upsilon(1S), but somewhat higher than the value expected from the running of the strong coupling constant.

Affiliated with

Also associated with

No associations

Rating

Inclusive Radiative $J/ψ$ Decays does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Inclusive Radiative $J/ψ$ Decays, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Inclusive Radiative $J/ψ$ Decays will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-632414