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Search for B c (ns) via the B c (ns) → B c (ms) π + π − transition at LHCb and Z 0 factory

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Abstract

It is interesting to study the characteristics of the whole family of B c which contains two different heavy flavors. LHC and the proposed Z 0 factory provide an opportunity because a large database of the B c family will be achieved. B c and its excited states can be identified via their decay modes. As suggested by experimentalists, B* c (ns) → B c + γ is not easy to be clearly measured, instead, the trajectories of π + and π − occurring in the decay of B c (ns) → B c (ms) + π + π − ( n > m) can be unambiguously identified, thus the measurement seems easier and more reliable; therefore this mode is more favorable at the early running stage of LHCb and the proposed Z 0 factory. In this work, we calculate the rate of B c (ns) → B c (ms) + π + π − in terms of the QCD multipole-expansion and the numerical results indicate that the experimental measurements with the luminosity of LHC and Z 0 factory are feasible.

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Authors and Affiliations

  1. School of Science, Tianjin University, Tianjin, 300072, China

    HongWei Ke

  2. School of Physics, Nankai University, Tianjin, 300071, China

    XueQian Li

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  1. HongWei Ke
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Correspondence to XueQian Li.

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Ke, H., Li, X. Search for B c (ns) via the B c (ns) → B c (ms) π + π − transition at LHCb and Z 0 factory. Sci. China Phys. Mech. Astron. 53, 2019–2024 (2010). https://doi.org/10.1007/s11433-010-4145-4

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