Measurement of the gamma gamma[superscript *]-->eta[subscript c] transition form factor

Author(s)
Fisher, Peter H.; Cowan, Ray Franklin; Dujmic, Denis; Sciolla, Gabriella; Yamamoto, R. K.; ... Show more
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Alternative title
Measurement of the γγ*→ηc transition form factor
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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/c2 and 31.7±1.2±0.8  MeV, respectively. We find Γ(eta c-->γγ)B(eta c-->KK[over-bar]pi)=0.374±0.009±0.031  keV, and measure the γγ*-->eta c transition form factor in the momentum transfer range from 2 to 50  GeV[superscript 2]. The analysis is based on 469  fb[superscript -1] of integrated luminosity collected at PEP-II with the BABAR detector at e+e- center-of-mass energies near 10.6 GeV.
Date issued
2010-03
URI
http://hdl.handle.net/1721.1/58924
Department
Massachusetts Institute of Technology. Department of Physics; Massachusetts Institute of Technology. Laboratory for Nuclear Science
Journal
Physical Review D
Publisher
American Physical Society
Citation
Lees, J. P. et al. “Measurement of the gamma gamma *--> eta [subscript c] transition form factor.” Physical Review D 81.5 (2010): 052010. © 2010 The American Physical Society.
Version: Final published version
ISSN
1550-7998
1550-2368
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