skip to main content

SciTech ConnectSciTech Connect

Title: 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.
Authors:
; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; more »; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; « less
Publication Date:
OSTI Identifier:
1298390
Report Number(s):
PNNL-SA-120220
Journal ID: ISSN 2470-0010; 45392; KA2201020
DOE Contract Number:
AC05-76RL01830
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review D; Journal Volume: 93; Journal Issue: 11
Publisher:
American Physical Society (APS)
Research Org:
Pacific Northwest National Laboratory (PNNL), Richland, WA (US), Environmental Molecular Sciences Laboratory (EMSL)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS Belle II; Belle Collaboration; Environmental Molecular Sciences Laboratory