We have studied the process e(+)e(-)-->mu(+)mu(-)gamma at a center-of-mass energy near the Y(4S) resonance for a mu(+)mu(-) invariant mass range near the J/psi mass and measured the cross section sigma(e(+)e(-)-->J/psi gamma-->mu(+)mu(-)gamma). The data set, corresponding to an integrated luminosity of 88.4 fb(-1), was collected using the BABAR detector at the SLAC PEP-II collider. From the measured cross section we extract the product Gamma(J/psi-->e(+)e(-))B(J/psi-->mu(+)mu(-))=0.330+/-0.008+/-0.007 keV. Using the world averages for B(J/psi-->mu(+)mu(-)) and B(J/psi-->e(+)e(-)), we derive the J/psi electronic and total widths: Gamma(J/psi-->e(+)e(-))=5.61+/-0.20 keV and Gamma=94.7+/-4.4 keV.

J/psi production via initial state radiation in e(+)e(-)->mu(+)mu(-)gamma at an e(+)e(-) center-of-mass energy near 10.6 GeV

BIANCHI, Fabrizio;GAMBA, Diego;
2004-01-01

Abstract

We have studied the process e(+)e(-)-->mu(+)mu(-)gamma at a center-of-mass energy near the Y(4S) resonance for a mu(+)mu(-) invariant mass range near the J/psi mass and measured the cross section sigma(e(+)e(-)-->J/psi gamma-->mu(+)mu(-)gamma). The data set, corresponding to an integrated luminosity of 88.4 fb(-1), was collected using the BABAR detector at the SLAC PEP-II collider. From the measured cross section we extract the product Gamma(J/psi-->e(+)e(-))B(J/psi-->mu(+)mu(-))=0.330+/-0.008+/-0.007 keV. Using the world averages for B(J/psi-->mu(+)mu(-)) and B(J/psi-->e(+)e(-)), we derive the J/psi electronic and total widths: Gamma(J/psi-->e(+)e(-))=5.61+/-0.20 keV and Gamma=94.7+/-4.4 keV.
2004
69
011103
-
B. Aubert; R. Barate; D. Boutigny; J. M. Gaillard; A. Hicheur; Y. Karyotakis; J. P. Lees; P. Robbe; V. Tisserand; A. Zghiche; A. Palano; A. Pompili; J...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2318/48161
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