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Measurement of the gamma gamma* -> eta c transition form factor
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(2010) Measurement of the gamma gamma* -> eta c transition form factor. Physical Review D (Particles, Fields, Gravitation and Cosmology), Vol.81 (No.5). article no. 052010. doi:10.1103/PhysRevD.81.052010 ISSN 1550-7998.
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Official URL: http://dx.doi.org/10.1103/PhysRevD.81.052010
Abstract
We study the reaction e(+)e(-) -> e(+)e(-) eta(c), eta(c) -> KSK +/-pi(-/+) and obtain eta(c) mass and width values 2982.2 +/- 0.4 +/- 1.6 MeV/c(2) and 31.7 +/- 1.2 +/- 0.8 MeV, respectively. We find Gamma(eta(c) -> gamma gamma)B(eta(c) -> KK pi) = 0.374 +/- 0.009 +/- 0.031 keV, and measure the gamma gamma* -> eta(c) 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.
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