Study of Decay Mechanisms in B{sup -}{yields}{lambda}{sub c}{sup +}p{pi}{sup -} Decays and Observation of Low-Mass Structure in the {lambda}{sub c}{sup +}p System
Journal Article
·
· Physical Review Letters
- Budker Institute of Nuclear Physics, Novosibirsk (Russian Federation)
- High Energy Accelerator Research Organization (KEK), Tsukuba (Japan)
Using a sample of 152x10{sup 6} BB pairs accumulated with the Belle detector at the KEKB e{sup +}e{sup -} collider, we study the decay mechanism of three-body charmed decay B{sup -}{yields}{lambda}{sub c}{sup +}p{pi}{sup -}. The intermediate two-body decay B{sup -}{yields}{sigma}{sub c}(2455){sup 0}p is observed for the first time with a branching fraction of (3.7{+-}0.7{+-}0.4{+-}1.0)x10{sup -5} and a statistical significance of 8.4{sigma}. We also observe a low-mass enhancement in the ({lambda}{sub c}{sup +}p) system, which can be parametrized as a Breit-Wigner function with a mass of (3.35{sub -0.02}{sup +0.01}{+-}0.02) GeV/c{sup 2} and a width of (0.07{sub -0.03}{sup +0.04}{+-}0.04) GeV/c{sup 2}. We measure its branching fraction to be (3.9{sub -0.7}{sup +0.8}{+-}0.4{+-}1.0)x10{sup -5} with a statistical significance of 6.2{sigma}. The errors are statistical, systematic, and that of the {lambda}{sub c}{sup +}{yields}pK{sup -}{pi}{sup +} decay branching fraction.
- OSTI ID:
- 20861471
- Journal Information:
- Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 24 Vol. 97; ISSN 0031-9007; ISSN PRLTAO
- Country of Publication:
- United States
- Language:
- English
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