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Using a sample of 152 million BBbar pairs accumulated with the Belle detectorat the KEKB e+e- collider, we perform a Dalitz plot analysis of the three-bodycharmed 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 fractionof (3.67^{+0.74}_{-0.66}+-0.36+-0.95)x10^(-5) and a statistical significance of8.4sigma. 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 thecorresponding decay branching fractions to be(3.87^{+0.77}_{-0.72}+-0.43+-1.01)x10^(-5)$ with a statistical significance of6.2sigma. The errors are statistical, systematic, and that of the Lambda_c^+ ->pK-pi+ decay branching fraction.Comment: 6 pages, 4 figure

physical review letters

Study of Decay Mechanisms in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msup><mml:mi>B</mml:mi><mml:mo>−</mml:mo></mml:msup><mml:mo>→</mml:mo><mml:msubsup><mml:mi>Λ</mml:mi><mml:mi>c</mml:mi><mml:mo>+</mml:mo></mml:msubsup><mml:mover accent="true"><mml:mi>p</mml:mi><mml:mo>¯</mml:mo></mml:mover><mml:msup><mml:mi>π</mml:mi><mml:mo>−</mml:mo></mml:msup></mml:math>Decays and Observation of Low-Mass Structure in the<mml:math xmlns:mml="http://www.w3.org/1998/Math/…

Study of Decay Mechanisms inB−→Λc+p¯π−Decays and Observation of Low-Mass Structure in the