We study the reaction e+e−→e+e−ηc, ηc→KSK±π∓ and obtain ηc mass and width values 2982.2±0.4±1.6  MeV/c2 and 31.7±1.2±0.8  MeV, respectively. We find Γ(ηc→γγ)ℬ(ηc→KK⎯⎯⎯π)=0.374±0.009±0.031  keV, and measure the γγ∗→ηc transition form factor in the momentum transfer range from 2 to 50  GeV2. The analysis is based on 469  fb−1 of integrated luminosity collected at PEP-II with the BABAR detector at e+e− center-of-mass energies near 10.6 GeV.

Lees, J.p., Poireau, V., Prencipe, E., Tisserand, V., Tico, J.g., Grauges, E., et al. (2010). Measurement of the gamma gamma* -> eta c transition form factor. PHYSICAL REVIEW D, PARTICLES, FIELDS, GRAVITATION, AND COSMOLOGY, 81(5), 1-18 [10.1103/PhysRevD.81.052010].

Measurement of the gamma gamma* -> eta c transition form factor

PATRIGNANI, CLAUDIA;
2010

Abstract

We study the reaction e+e−→e+e−ηc, ηc→KSK±π∓ and obtain ηc mass and width values 2982.2±0.4±1.6  MeV/c2 and 31.7±1.2±0.8  MeV, respectively. We find Γ(ηc→γγ)ℬ(ηc→KK⎯⎯⎯π)=0.374±0.009±0.031  keV, and measure the γγ∗→ηc transition form factor in the momentum transfer range from 2 to 50  GeV2. The analysis is based on 469  fb−1 of integrated luminosity collected at PEP-II with the BABAR detector at e+e− center-of-mass energies near 10.6 GeV.
2010
Lees, J.p., Poireau, V., Prencipe, E., Tisserand, V., Tico, J.g., Grauges, E., et al. (2010). Measurement of the gamma gamma* -> eta c transition form factor. PHYSICAL REVIEW D, PARTICLES, FIELDS, GRAVITATION, AND COSMOLOGY, 81(5), 1-18 [10.1103/PhysRevD.81.052010].
Lees, Jp; Poireau, V; Prencipe, E; Tisserand, V; Tico, Jg; Grauges, E; Martinelli, M; Palano, A; Pappagallo, M; Eigen, G; Stugu, B; Sun, L; Battaglia,...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/534864
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