First observation of γγ-> p$$\bar{p}$$K+K- and search for exotic baryons in pK systems
The process γγ→p$$\bar{p}$$K+K- and its intermediate processes are measured for the first time using a 980 fb-1 data sample collected with the Belle detector at the KEKB asymmetric-energy e+e- collider. The production of p$$\bar{p}$$K+K- and a Λ(1520)0 ($$\bar{Λ}$$(1520)0) signal in the pK- ($$\bar{p}$$K+) invariant mass spectrum are clearly observed. However, no evidence for an exotic baryon near 1540 MeV/c2, denoted as Θ(1540)0 ($$\bar{Θ}$$(1540)0) or Θ(1540)++ (Θ(1540)--), is seen in the pK- ($$\bar{p}$$K+) or pK+ ($$\bar{p}$$K-) invariant mass spectra. Cross sections for γγ→p$$\bar{p}$$K+K-, Λ(1520)0$$\bar{p}$$K++c.c. and the products σ(γγ→Θ(1540)0$$\bar{p}$$K++c.c.)B(Θ(1540)0→pK-) and σ(γγ→Θ(1540)++$$\bar{p}$$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 p$$\bar{p}$$K+K- at the 90% credibility level.
- Research Organization:
- Pacific Northwest National Lab. (PNNL), Richland, WA (United States). Environmental Molecular Sciences Lab. (EMSL)
- Sponsoring Organization:
- USDOE Office of Science (SC), High Energy Physics (HEP)
- DOE Contract Number:
- AC05-76RL01830
- OSTI ID:
- 1298390
- Report Number(s):
- PNNL-SA-120220; 45392; KA2201020
- Journal Information:
- Physical Review D, Vol. 93, Issue 11; ISSN 2470-0010
- Publisher:
- American Physical Society (APS)
- Country of Publication:
- United States
- Language:
- English
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