Search for Theta++ pentaquarks in the exclusive reaction gammap-->K+K-p.
Phys Rev Lett
; 97(10): 102001, 2006 Sep 08.
Article
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| MEDLINE
| ID: mdl-17025804
ABSTRACT
The reaction gammap --> pK+K- 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++ pentaquark, a narrow, doubly charged baryon state having strangeness S=+1 and isospin I=1, in the pK+ invariant mass spectrum. No statistically significant evidence of a Theta++ was found. Upper limits on the total and differential cross section for the reaction gammap --> K-Theta++ were obtained in the mass range from 1.5 to 2.0 GeV/c2, with an upper limit for a narrow resonance with a mass M(Theta++) = 1.54 GeV/c2 of about 0.15 nb, 95% C.L.. This result places a stringent upper limit on the Theta++ width Gamma(Theta++) <0.1 MeV/c2.
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MEDLINE
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En
Revista:
Phys Rev Lett
Año:
2006
Tipo del documento:
Article
País de afiliación:
Estados Unidos