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

Abstract

Using 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.

arXiv comment6 pages, 4 figures

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• Progress Toward Understanding Baryon Resonances
• Four-Quark Hadrons: an Updated Review
• Doubly Charmed Tetraquarks in B_c and Xi_bc Decays
• Study of the decay mechanism for B+ to p pbar K+ and B+ to p pbar pi+
• Study of B+ to p Lambdabar gamma, p Lambdabar pi0 and B0 to p Lambdabar pi-
• Charmful Three-body Baryonic B decays
• First observation of a baryonic $B_c^{+}$ decay
• Hints for the existence of hexaquark states in the baryon-antibaryon sector
• Theory of hadron decay into baryon-antibaryon final state
• Observation of B+ to p Lambdabar pi+ pi- at Belle
• Search for \bar{B}^0\toΛ_c^+\barΛ_c^- decay at Belle
• Determination of Spin-parity Quantum Numbers for the Narrow Structure Near the $p\bar{\Lambda }$ Threshold in $e^{+}{e}^{-}\to p{K}^{-}\bar{\Lambda }+c.c.$
• Charmful baryonic B\to {\bf B\bar B'}M_c decays
• Evidence for the baryonic decay B0bar --> D0 Lambda Lambdabar
• Mass Spectra of $qq\bar{q}\bar{q}$, $ss\bar{s}\bar{s}$ and $qq\bar{s}\bar{s}$ Tetraquarks using Regge Phenomenology
• Results in $B_s$ physics and bottomonium spectroscopy using the Belle ${\rm Y}(5S)$ data
• Search for the decay mode $B^0\to pp\bar{p}\bar{p}$
• Evidence for B_s^0 -> Lambda_c^+ Lambda-bar pi^-