Measurement of the gamma gamma* --> eta_c transition form factor

et al; The BABAR Collaboration: J. P. Lees

Measurement of the gamma gamma* --> eta_c transition form factor

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arxiv 1002.3000 v2 pith:ZBX5SRKZ submitted 2010-02-16 hep-ex

The BABAR Collaboration: J. P. Lees , et al This is my paper · ORCID

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keywords gammafactorformtransitionanalysisanti-kbabarcenter-of-mass

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We study the reaction e+e- --> e+e- eta_c, eta_c --> K_S K+- 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 --> K anti-K 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 GeV^2. 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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The ${\gamma^* \gamma^* \to \eta_c (1S,2S)}$ transition form factors for spacelike photons
hep-ph 2019-08 conditional novelty 6.0 of 10

The double-virtual gamma*gamma* to eta_c transition form factor is computed from light-front wave functions and is predicted to violate factorization strongly while depending only weakly on the asymmetry of the two ph...

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