Measurement of the B+ --> p pbar K+ Branching Fraction and Study of the Decay Dynamics

Details Measurement of the B+ --> p pbar K+ Branching Fraction and Study of the Decay Dynamics Measurement of the B+ --> p pbar K+ Branching Fraction and Study of the Decay Dynamics

2005-07-01

arxiv.org/abs/hep-ex/0507012v1

Phys.Rev.D72:051101,2005

Physics

High Energy Physics

High Energy Physics - Experiment

8 pages, 7 postscript figures, submitted to Phys. Rev. D (Rapid Communications)

Scientific paper

10.1103/PhysRevD.72.051101

With a sample of 232x10^6 Upsilon(4S) --> BBbar events collected with the BaBar detector, we study the decay B+ --> p pbar K+ excluding charmonium decays to ppbar. We measure a branching fraction Br(B+ --> p pbar K+)=(6.7+/-0.5+/-0.4)x10^{-6}. An enhancement at low ppbar mass is observed and the Dalitz plot asymmetry suggests dominance of the penguin amplitude in this B decay. We search for a pentaquark candidate Theta*++ decaying into pK+ in the mass range 1.43 to 2.00 GeV/c2 and set limits on Br(B+ --> Theta*++pbar)xBr(Theta*++ --> pK+) at the 10^{-7} level.

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