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Measurements of B((B)over-bar(0) -> Lambda(+)(c)(p)over-bar and B(B- -> Lambda(+)(c)(p)over-bar pi(-)) and studies of Lambda(+)(c)pi(-) resonances
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BABAR-Collaboration (Including:
). (2008) Measurements of B((B)over-bar(0) -> Lambda(+)(c)(p)over-bar and B(B- -> Lambda(+)(c)(p)over-bar pi(-)) and studies of Lambda(+)(c)pi(-) resonances. Physical Review D (Particles, Fields, Gravitation and Cosmology), Vol.78 (No.11). article no. 112003. doi:10.1103/PhysRevD.78.112003 ISSN 1550-7998.Research output not available from this repository.
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Official URL: http://dx.doi.org/10.1103/PhysRevD.78.112003
Abstract
We present an investigation of the decays B-0 -> Lambda(+)(c)(p) over bar and B- -> Lambda(+)(c)(p) over bar pi(-) based on 383 X 10(6)Y(4S) -> B (B) over bar decays recorded with the BABAR detector. We measure the branching fractions of these decays; their ratio is B(B- -> Lambda(+)(c)(p) over bar pi(-))/B((B) over bar (0) -> Lambda(+)(c)(p) over bar) = 15.4 +/- 1.8 +/- 0.3. The B- -> Lambda(+)(c)(p) over bar pi(-) process exhibits an enhancement at the Lambda(+)(c)(p) over bar threshold and is a laboratory for searches for excited charm baryon states. We observe the resonant decays B- -> Sigma(c)(2455)(0)(p) over bar and B- -> Sigma(c)(2800)(0)(p) over bar but see no evidence for B- -> Sigma(c)(2520)(0)(p) over bar. This is the first observation of the decay B- -> Sigma(c)(2800)(0)(p) over bar; however, the mass of the observed excited Sigma(0)(c) state is (2846 +/- 8 +/- 10) MeV/c(2), which is somewhat inconsistent with previous measurements. Finally, we examine the angular distribution of the B- -> Sigma(c)(2455)(0)(p) over bar decays and measure the spin of the Sigma(c)(2455)(0) baryon to be 1/2, as predicted by the quark model.
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