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Article
Report number	arXiv:0910.1158
Title	Search for $B_c(ns)$ via the $B_c(ns)\to B_c(ms)\pi^+\pi^-$ transition at LHCb and $Z_0$ factory
Related title	Search for B(c)(ns) via the B(c)(ns) ---> B(c)(ms) pi+ pi- transition at LHCb and Z(0) factory
Author(s)	Ke, Hong-Wei (Tianjin U.) ; Li, Xue-Qian (Nankai U.)
Publication	2009
Imprint	08 Oct 2009
Number of pages	6
In:	Sci. China Phys. Mech. Astron. 53 (2010) 2019-2024
DOI	10.1007/s11433-010-4145-4
Subject category	Particle Physics - Phenomenology
Accelerator/Facility, Experiment	CERN LHC ; LHCb
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 on the $B_c$ family will be achieved. $B_c$ and its excited states can be identified via their decay modes. As suggested by experimentalists, $B_c^*(ns)\to B_c+\gamma$ is not easy to be clearly measured, instead, the trajectories of $\pi^+$ and $\pi^-$ occurring in the decay of $B_c(ns)\to B_c(ms)+\pi^+\pi^-$ ($n>m$) can be unambiguously identified, thus the measurement seems easier and more reliable, therefore this mode is more favorable at early running stage of LHCb and the proposed $Z^0$ factory. In this work, we calculate the rate of $B_c(ns)\to B_c(ms)+\pi^+\pi^-$ 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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