First observation of γγpp¯K+K and search for exotic baryons in pK systems

C. P. Shen et al. (Belle Collaboration)
Phys. Rev. D 93, 112017 – Published 30 June 2016

Abstract

The process γγpp¯K+K and its intermediate processes are measured for the first time using a 980fb1 data sample collected with the Belle detector at the KEKB asymmetric-energy e+e collider. The production of pp¯K+K and a Λ(1520)0 (Λ¯(1520)0) signal in the pK (p¯K+) invariant mass spectrum are clearly observed. However, no evidence for an exotic baryon near 1540MeV/c2, denoted as Θ(1540)0 (Θ¯(1540)0) or Θ(1540)++ (Θ(1540)), is seen in the pK (p¯K+) or pK+ (p¯K) invariant mass spectra. Cross sections for γγpp¯K+K, Λ(1520)0p¯K++c.c. and the products σ(γγΘ(1540)0p¯K++c.c.)B(Θ(1540)0pK) and σ(γγΘ(1540)++p¯K+c.c.)B(Θ(1540)++pK+) are measured. We also determine upper limits on the products of the χc0 and χc2 two-photon decay widths and their branching fractions to pp¯K+K at the 90% credibility level.

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  • Received 9 April 2016

DOI:https://doi.org/10.1103/PhysRevD.93.112017

© 2016 American Physical Society

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Vol. 93, Iss. 11 — 1 June 2016

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