Abstract
A high precision study of the process γγ→pp¯ has been performed using a data sample of 89 fb−1 collected with the Belle detector at the KEKB e+e− collider. The cross section of pp¯ 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 |cosθ∗|<0.6. Production of γγ→ηc→pp¯ is observed and the product of the two-photon width of the ηc and its branching ratio to pp¯ is determined.
Highlights
Two-photon collisions provide a clean environment for baryon pair production and such events can be produced in great abundance at a high luminosity electron-positron collider
Using the Belle detector at the high-luminosity KEKB collider, the cross sections for γγ → pp have been measured for Wγγ from 2.025 to 4.0 GeV and | cos θ∗| < 0.6, with systematic uncertainties ranging from 7% to 14%
These results represent a great improvement in precision compared to all previous measurements and allow more accurate tests of various theoretical models
Summary
Two-photon collisions provide a clean environment for baryon pair production and such events can be produced in great abundance at a high luminosity electron-positron collider Accurate measurements of such processes, in particular γγ → pp, is important to test existing theoretical predictions. Previous measurements [7,8,9,10,11] in the Wγγ(≡ s) range between 2.5 and 3.0 GeV gave cross sections one order of magnitude larger than this expectation. To explain these experimental observations, various model-dependent approaches were suggested. Using a data sample corresponding to an integrated luminosity of 89 fb−1
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