Study of the decay Bˉ0→Λ+cpˉπ+π− and its intermediate states

Media type: E-Article

Title: Study of the decay Bˉ0→Λ+cpˉπ+π− and its intermediate states

Contributor: Lees, J. P. [Author]; Poireau, V. [Author]; Lynch, G. [Author]; Robutti, E. [Author]; Bhuyan, B. [Author]; Prasad, V. [Author]; Morii, M. [Author]; Adametz, A. [Author]; Uwer, U. [Author]; Lacker, H. M. [Author]; Lueck, T. [Author]; Dauncey, P. D. [Author]; Mallik, U. [Author]; Koch, H. [Author]; Chen, C. [Author]; Cochran, J. [Author]; Meyer, W. T. [Author]; Prell, S. [Author]; Rubin, A. E. [Author]; Gritsan, A. V. [Author]; Arnaud, N. [Author]; Davier, M. [Author]; Derkach, D. [Author]; Grosdidier, G. [Author]; [...]

Published: Soc., 2013

Language: English

DOI: https://doi.org/10.1103/PhysRevD.87.092004

ISSN: 1550-2368; 1550-7998; 0556-2821; 1089-4918

Keywords: anti-B0: hadronic decay ; B: pair production ; Lambda/c+: production ; electron positron: annihilation ; experimental results ; anti-B0: branching ratio: measured ; charmed baryon: charge ; anti-B0 --> Lambda/c+ anti-p pi+ pi- ; Lambda/c+ --> p K- pi+ ; Sigma/c(2455): intermediate state ; BaBar ; SLAC PEP Stor ; Sigma/c(2520): intermediate state ; 10.58 GeV-cms

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Description: We study the decay $\bar{B}^{0}\rightarrow\Lambda_{c}^{+}\bar{p}\pi^{+}\pi^{-}$, reconstructing the \Lambda_{c}^{+} baryon in the $p K^{-}\pi^{+}$ mode, using a data sample of $467\times 10^{6}$ $B\bar{B}$ pairs collected with the BaBar detector at the PEP-2 storage rings at SLAC. We measure branching fractions for decays with intermediate $\Sigma_{c}$ baryons to be ${\cal B}[\bar{B}^{0}\rightarrow\Sigma_{c}(2455)^{++}\bar{p}\pi^{-}]=(21.3 \pm 1.0 \pm 1.0 \pm 5.5) \times 10^{-5}$, ${\cal B}[\bar{B}^{0}\rightarrow\Sigma_{c}(2520)^{++}\bar{p}\pi^{-}]=(11.5\pm 1.0 \pm 0.5 \pm 3.0)\times 10^{-5}$, ${\cal B}[\bar{B}^{0}\rightarrow\Sigma_{c}(2455)^{0}\bar{p}\pi^{+}]=(9.1 \pm 0.7 \pm 0.4 \pm 2.4)\times10^{-5}$, and ${\cal B}[\bar{B}^{0}\rightarrow\Sigma_{c}(2520)^{0}\bar{p}\pi^{+}]= (2.2 \pm 0.7 \pm 0.1\pm 0.6) \times 10^{-5}$, where the uncertainties are statistical, systematic, and due to the uncertainty on the $\Lambda_{c}^{+}\rightarrow\proton\Km\pi^{+}$ branching fraction, respectively. For decays without $\Sigma_{c}(2455)$ or $\Sigma_{c}(2520)$ resonances, we measure ${\cal B}[\bar{B}^{0}\rightarrow\Lambda_{c}^{+}\bar{p}\pi^{+}\pi^{-}]_{\mathrm{non-\Sigma_{c}}}=(79 \pm 4 \pm 4 \pm 20)\times10^{-5}$. The total branching fraction is determined to be ${\cal B}[\bar{B}^{0}\rightarrow\Lambda_{c}^{+}\bar{p}\pi^{+}\pi^{-}]_{\mathrm{total}}=(123 \pm 5 \pm 7 \pm 32)\times10^{-5}$. We examine multibody mass combinations in the resonant three-particle $\Sigma_{c}\bar{p}\pi$ final states and in the four-particle $\Lambda_{c}^{+}\bar{p}\pi^{+}\pi^{-}$ final state, and observe different characteristics for the $\bar{p}\pi$ combination in neutral versus doubly-charged $\Sigma_{c}$ decays.

Access State: Open Access

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