Observation of an Exotic S = +1 Baryon in Exclusive Photoproduction from the Deuteron
Journal Article
·
· Physical Review Letters
OSTI ID:824948
In an exclusive measurement of the reaction {gamma}d {yields} K{sup +} K{sup -} p n, a narrow peak that can be attributed to an exotic baryon with strangeness S = +1 is seen in the K{sup +}n invariant mass spectrum. The peak is at 1542 {+-} 5 MeV/c{sup 2} with a measured width of 21 MeV/c{sup 2} FWHM, equivalent to the experimental invariant mass resolution. The statistical significance of the peak is 5.3 {+-} 0.5 {sigma} for a Gaussian peak shape on top of a smooth background.
- Research Organization:
- Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
- Sponsoring Organization:
- USDOE Office of Energy Research (ER) (US)
- DOE Contract Number:
- AC05-84ER40150
- OSTI ID:
- 824948
- Report Number(s):
- JLAB-PHY-03-132; DOE/ER/40150-2769; hep-ex/0307018; PRLTAO; TRN: US0402263
- Journal Information:
- Physical Review Letters, Vol. 91; Other Information: PBD: 19 Dec 2003; ISSN 0031-9007
- Country of Publication:
- United States
- Language:
- English
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OSTI ID:824948