Observation of B{sup +}{yields}p{lambda}{gamma}
- Department of Physics, National Taiwan University, Taipei (China)
- High Energy Accelerator Research Organization (KEK), Tsukuba (Japan); and others
We report the first observation of the radiative hyperonic B decay B{sup +}{yields}p{lambda}{gamma}, using a 140 fb{sup -1} data sample recorded on the {upsilon}(4S) resonance with the Belle detector at the KEKB asymmetric energy e{sup +}e{sup -} collider. The measured branching fraction is B(B{sup +}{yields}p{lambda}{gamma})=(2.16{sub -0.53}{sup +0.58}{+-}0.20)x10{sup -6}. We examine its M{sub p{lambda}} distribution and observe a peak near threshold. This feature is expected by the short-distance b{yields}s{gamma} transition. A search for B{sup +}{yields}p{sigma}{sup 0}{gamma} yields no significant signal, and we set a 90% confidence-level upper limit on the branching fraction of B(B{sup +}{yields}p{sigma}{sup 0}{gamma})<4.6x10{sup -6}.
- OSTI ID:
- 20699279
- Journal Information:
- Physical Review Letters, Vol. 95, Issue 6; Other Information: DOI: 10.1103/PhysRevLett.95.061802; (c) 2005 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA). Belle Collaboration; ISSN 0031-9007
- Country of Publication:
- United States
- Language:
- English
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