Measurements of B(anti-B0 ---> Lambda(c)+ anti-p) and B(B- ---> Lambda(c)+ anti-p pi-) and Studies of Lambda(c)+ pi- Resonances - INSPIRE

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Measurements of B(anti-B0 ---> Lambda(c)+ anti-p) and B(B- ---> Lambda(c)+ anti-p pi-) and Studies of Lambda(c)+ pi- Resonances

BaBar

Collaboration

Jul, 2008

20 pages

Published in:

Phys.Rev.D 78 (2008) 112003

e-Print:

0807.4974 [hep-ex]

DOI:

10.1103/PhysRevD.78.112003

PDG:

{{\mathit \Sigma}_{{{c}}}{(2455)}^{0}}

Report number:

BABAR-PUB-08-016,
SLAC-PUB-13341

Experiments:

SLAC-PEP2-BABAR

View in:

reference search108 citations

Citations per year

Abstract: (arXiv)

We present an investigation of the decays

\bar{B}^0 \to \Lambda_{c}^{+} \bar{p}

and

B^- \to \Lambda_{c}^{+} \bar{p} \pi^-

based on

383\times10^6

\Upsilon(4S) \to B\bar{B}

decays recorded with the BABAR detector. We measure the branching fractions of these decays/ their ratio is

{\cal B}(B^- \to \Lambda_{c}^{+} \bar{p} \pi^-) / {\cal B}(\bar{B}^0 \to \Lambda_{c}^{+} \bar{p}) = 15.4 \pm 1.8 \pm 0.3

. The

B^- \to \Lambda_{c}^{+} \bar{p} \pi^-

process exhibits an enhancement at the

\Lambda_{c}^{+} \bar{p}

threshold and is a laboratory for searches for excited charm baryon states. We observe the resonant decays

\bar{B}^- \to \Sigma_{c}(2455)^{0} \bar{p}

and

B^- \to \Sigma_{c}(2800)^{0} \bar{p}

but see no evidence for B^- \to \Sigma_{c}(2520)^{0} \baver{p}. This is the first observation of the decay

B^- \to \Sigma_{c}(2800)^{0} \bar{p}

/ however, the mass of the observed excited

\Sigma_{c}^{0}

state is

(2846\pm8\pm10)MeV/c^2

, which is somewhat inconsistent with previous measurements. Finally, we examine the angular distribution of the

B^- \to \Sigma_{c}(2455)^{0} \bar{p}

decays and measure the spin of the

\Sigma_{c}(2455)^{0}

baryon to be 1/2, as predicted by the quark model.

Note:

20 pages, 11 postscript figures, submitted to PRD

14.20.Lq
13.60.Rj
13.25.Hw
electron positron: annihilation
B: pair production
anti-B: hadronic decay
Lambda/c+
anti-B0: branching ratio
B-: branching ratio
charmed baryon: excited state

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