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Observation of B+pΛ¯π+π at Belle

P. Chen et al. (Belle Collaboration)
Phys. Rev. D 80, 111103(R) – Published 14 December 2009

Abstract

We study charmless B+ meson decays to the pΛ¯π+π final state using a 605fb1 data sample collected at the Υ(4S) resonance with the Belle detector at the KEKB asymmetric-energy e+e collider. There are significant signals found with the pΛ¯ mass peaking near threshold. The observed branching fraction for nonresonant B+pΛ¯π+π is (5.920.84+0.88(stat)±0.69(syst))×106 with a significance of 9.1 standard deviations. We also observe the intermediate three-body decay B+pΛ¯ρ0 with a branching fraction of (4.780.64+0.67(stat)±0.60(syst))×106 and a significance of 9.5 standard deviations, and find a hint of a B+pΛ¯f2(1270) signal. No other intermediate three-body decay is found in this study.

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  • Received 30 October 2009

DOI:https://doi.org/10.1103/PhysRevD.80.111103

©2009 American Physical Society

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Vol. 80, Iss. 11 — 1 December 2009

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