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Title

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

AuthorsBabar Collaboration; Azzolini, Virginia; López-March, Neus CSIC; Martínez-Vidal, Fernando CSIC ORCID; Milanés, Diego A. CSIC; Oyanguren, Arantza CSIC ORCID; Lees, J. P.
Issue Date1-Mar-2010
PublisherAmerican Physical Society
CitationPhysical Review - Section D - Particles and Fields 81 (5): 052010 (2010)
AbstractWe 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.
URIhttp://hdl.handle.net/10261/24931
DOI10.1103/PhysRevD.81.052010
ISSN1550-7998
Appears in Collections:(IFIC) Artículos




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