Study of decay mechanisms in B- -> Lambda_c+ pbar pi- decay and observation of low mass structure in the (Lambda_c+ pbar) system

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dc.creatorThe Belle Collaboration
dc.creatorGabyshev, N.
dc.date2004-09-01
dc.date2006-12-14
dc.date.accessioned2026-07-07T11:57:55Z
dc.date.available2026-07-07T11:57:55Z
dc.descriptionUsing a sample of 152 million BBbar pairs accumulated with the Belle detector at the KEKB e+e- collider, we perform a Dalitz plot analysis of the three-body charmed decay B- -> Lambda_c+ p_bar pi-. The intermediate two-body decay B- -> Sigma_c(2455)0 p_bar is observed for the first time with a branching fraction of (3.67^{+0.74}_{-0.66}+-0.36+-0.95)x10^(-5) and a statistical significance of 8.4sigma. We also observe a low-mass enhancement in the (Lambda_c+ p_bar) system, which can be parameterized as a Breit-Wigner function with a mass of (3.35^{+0.01}_{-0.02}+-0.02)GeV/c^2 and a width of (0.07^{+0.04}_{-0.03}+-0.04)GeV/c^2. We measure the product of the corresponding decay branching fractions to be (3.87^{+0.77}_{-0.72}+-0.43+-1.01)x10^(-5)$ with a statistical significance of 6.2sigma. The errors are statistical, systematic, and that of the Lambda_c^+ -> pK-pi+ decay branching fraction.
dc.description6 pages, 4 figures
dc.identifierhttps://arxiv.org/abs/hep-ex/0409005
dc.identifierhttp://arxiv.org/abs/hep-ex/0409005
dc.identifierPhys.Rev.Lett.97:242001,2006
dc.identifierdoi:10.1103/PhysRevLett.97.242001
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/206053
dc.subjectHigh Energy Physics - Experiment
dc.titleStudy of decay mechanisms in B- -> Lambda_c+ pbar pi- decay and observation of low mass structure in the (Lambda_c+ pbar) system
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