Measurements of {\cal B}(\overline{B}^0 \to \Lambda_{c}^{+} \overline{p}) and {\cal B}(B^- \to \Lambda_{c}^{+} \overline{p} \pi^-) and Studies of \Lambda_{c}^{+}\pi^- Resonances
The authors present an investigation of the decays {bar B}{sup 0} {yields} {Lambda}{sub c}{sup +}{bar p} and B{sup -} {yields} {Lambda}{sub c}{sup +}{bar p}{pi}{sup -} based on 383 x 10{sup 6} {Upsilon}(4S) {yields} B{bar B} decays recorded with the BABAR detector. They measure the branching fractions of these decays; their ratio is {Beta}(B{sup -} {yields} {Lambda}{sub c}{sup +}{bar p}{pi}{sup -})/{Beta}({bar B}{sup 0} {yields} {Lambda}{sub c}{sup +}{bar p}) = 15.4 {+-} 1.8 {+-} 0.3. The B{sup -} {yields} {Lambda}{sub c}{sup +}{bar p}{pi}{sup -} process exhibits an enhancement at the {Lambda}{sub c}{sup +}{bar p} threshold and is a laboratory for searches for excited charm baryon states. They observe the resonant decays B{sup -} {yields} {Sigma}{sub c}(2455){sup 0}{bar p} and B{sup -} {Sigma}{sub c}(2800){sup 0}{bar p} but see no evidence for B{sup -} {yields} {Sigma}{sub c}(2520){sup 0}{bar p}. This is the first observation of the decay B{sup -} {yields} {Sigma}{sub c}(2800){sup 0}{bar p}; however, the mass of the observed excited {Sigma}{sub c}{sup 0} state is (2846 {+-} 8 {+-} 10) MeV/c{sup 2}, which is somewhat inconsistent with previous measurements. Finally, they examine the angular distribution of the B{sup -} {yields} {Sigma}{sub c}(2455){sup 0}{bar p} decays and measure the spin of the {Sigma}{sub c}(2455){sup 0} baryon to be 1/2, as predicted by the quark model.
- Research Organization:
- SLAC National Accelerator Lab., Menlo Park, CA (United States)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AC02-76SF00515
- OSTI ID:
- 935681
- Report Number(s):
- SLAC-PUB-13341; arXiv:0807.4974; TRN: US0804626
- Journal Information:
- Physical Review D, Conference: Contributed to 34th International Conference on High Energy Physics (ICHEP 2008), Philadelphia, Pennsylvania, 30 Jul - 5 Aug 2008
- Country of Publication:
- United States
- Language:
- English
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