We have studied the process e+e-→μ+μ-γ at a center-of-mass energy near the Υ(4S) resonance for a μ+μ- invariant mass range near the J/ψ mass and measured the cross section σ(e+e-→J/ψγ⃗μ+μ-γ). The data set, corresponding to an integrated luminosity of 88.4fb-1, was collected using the BABAR detector at the SLAC PEP-II collider. From the measured cross section we extract the product Γ(J/ψ⃗e+e-)B(J/ψ⃗μ+μ-)=0.330±0.008±0.007keV. Using the world averages for B(J/ψ⃗μ+μ-) and B(J/ψ⃗e+e-), we derive the J/ψ electronic and total widths: Γ(J/ψ⃗e+e-)=5.61±0.20keV and Γ=94.7±4.4keV.
J/ψ production via initial state radiation in e+e-→μ+μ-γ at an e+e- center-of-mass energy near 10.6 GeV
MARGONI, MARTINO;SIMONETTO, FRANCO;STROILI, ROBERTO;VOCI, CESARE;SIMI, GABRIELE;
2004
Abstract
We have studied the process e+e-→μ+μ-γ at a center-of-mass energy near the Υ(4S) resonance for a μ+μ- invariant mass range near the J/ψ mass and measured the cross section σ(e+e-→J/ψγ⃗μ+μ-γ). The data set, corresponding to an integrated luminosity of 88.4fb-1, was collected using the BABAR detector at the SLAC PEP-II collider. From the measured cross section we extract the product Γ(J/ψ⃗e+e-)B(J/ψ⃗μ+μ-)=0.330±0.008±0.007keV. Using the world averages for B(J/ψ⃗μ+μ-) and B(J/ψ⃗e+e-), we derive the J/ψ electronic and total widths: Γ(J/ψ⃗e+e-)=5.61±0.20keV and Γ=94.7±4.4keV.File in questo prodotto:
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