Search for {theta}{sup ++} Pentaquarks in the Exclusive Reaction {gamma}p{yields}K{sup +}K{sup -}p
Journal Article
·
· Physical Review Letters
- Rensselaer Polytechnic Institute, Troy, New York 12180-3590 (United States)
- Istituto Nazionale di Fisica Nucleare, Sezione di Genova, and Dipartimento di Fisica, Universita di Genova, 16146 Genova (Italy)
- Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606 (United States)
The reaction {gamma}p{yields}pK{sup +}K{sup -} was studied at Jefferson Lab with photon energies from 1.8 to 3.8 GeV using a tagged photon beam. The goal was to search for a {theta}{sup ++} pentaquark, a narrow, doubly charged baryon state having strangeness S=+1 and isospin I=1, in the pK{sup +} invariant mass spectrum. No statistically significant evidence of a {theta}{sup ++} was found. Upper limits on the total and differential cross section for the reaction {gamma}p{yields}K{sup -}{theta}{sup ++} were obtained in the mass range from 1.5 to 2.0 GeV/c{sup 2}, with an upper limit for a narrow resonance with a mass M{sub {theta}{sup ++}}=1.54 GeV/c{sup 2} of about 0.15 nb, 95% C.L.. This result places a stringent upper limit on the {theta}{sup ++} width {gamma}{sub {theta}{sup ++}}<0.1 MeV/c{sup 2}.
- OSTI ID:
- 20860779
- Journal Information:
- Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 10 Vol. 97; ISSN 0031-9007; ISSN PRLTAO
- Country of Publication:
- United States
- Language:
- English
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