Measurement of gamma gamma -> p p-bar production at Belle
C. C. Kuo, et al. (for the Belle Collaboration)
TL;DR
This study precisely measures the gamma gamma -> p p-bar production cross section over a range of energies using Belle data, observes eta_c production, and determines related decay parameters.
Contribution
It provides high-precision measurements of gamma gamma -> p p-bar cross sections and reports the first observation of eta_c -> p p-bar in two-photon collisions at Belle.
Findings
Measured cross sections between 2.025 and 4.0 GeV
Observed eta_c -> p p-bar production
Determined eta_c two-photon width and branching ratio
Abstract
A high precision study of the process gamma gamma -> p p-bar has been performed using a data sample of 89/fb collected with the Belle detector at the KEKB e+e- collider. The cross section of p p-bar production has been measured at two-photon center-of-mass (c.m.) energies between 2.025 and 4.0 GeV and in the c.m. angular range of |cos(theta^*)|<0.6. Production of gamma gamma -> eta_c -> p p-bar is observed and the product of the two-photon width of the eta_c and its branching ratio to p p-bar is determined.
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