Study of the decay mechanism for B+ to p pbar K+ and B+ to p pbar pi+

Details Study of the decay mechanism for B+ to p pbar K+ and B+ to p pbar pi+ Study of the decay mechanism for B+ to p pbar K+ and B+ to p pbar pi+

2007-06-28

arxiv.org/abs/0706.4167v3

Phys.Lett.B659:80-86,2008

Physics

High Energy Physics

High Energy Physics - Experiment

15 pages, 5 figures (14 figure files), revisions to Phys. Lett. B

Scientific paper

10.1016/j.physletb.2007.11.063

We study the characteristics of the low mass ppbar enhancements near threshold in the three-body decays B+ to p pbar K+ and B+ to p pbar pi+. We observe that the proton polar angle distributions in the ppbar helicity frame in the two decays have the opposite polarity, and measure the forward-backward asymmetries as a function of the ppbar mass for the p pbar K+ mode. We also search for the intermediate two-body decays, B+ to pbar Delta++ and B+ to p Delta0bar, and set upper limits on their branching fractions. These results are obtained from a 414 fb^{-1} data sample that contains 449 times 10^6 BBbar events collected near the Upsilon(4S) resonance with the Belle detector at the KEKB asymmetric-energy e+ e- collider.

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