Uncertainties in estimating the indirect production of Bc and its excited states via top quark decays at CERN LHC

Uncertainties in estimating the indirect production of Bc and its excited states via top quark decays at CERN LHC
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估计 CERN LHC 顶夸克衰变间接产生 Bc 及其激发态的不确定性

DOI:
10.1016/j.physletb.2008.12.015
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发表时间:
2008-05
期刊:
影响因子:
4.4
通讯作者:
Wu, Xing-Gang
Wu, Xing-Gang
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Wu, Xing-Gang

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在非相对论 QCD 框架内研究了通过顶夸克衰变 t→(bć)+c+W+ 间接产生 (bć)-夸克素(Bc−介子及其激发态)的主要理论不确定性。研究发现,特定 (bc´)-夸克素态的无量纲缩减衰变宽度,[公式:见正文],对 c-夸克质量非常敏感,而 b-夸克和 t-夸克质量的不确定性很小,其中 n 代表 O(v4) 以内的 8 个 (bc´)-夸克素态:|(bc´)(S01)1>, |(bc´)(S13)1>、|(bc´)(P11)1>、|(bc´)(PJ3)1>(其中 J=(1,2,3))、|(bc´)(S01)8g> 和 |(bc´)(S13)8g> 分别。 CERN LHC 每年大约会产生 108 个 tt´-pairs,如果采用所有较高的 Fock 态以 100% 的概率衰变到基态的假设,那么我们每年将产生 (1.038−0.782+1.353)×105Bc−events。因此,与 CERN LHC 的直接强子产生相比,间接产生提供了另一种研究 Bc−介子特性的重要方法。
Main theoretical uncertainties in estimating the indirect production of (bc¯)-quarkonium (Bc−meson and its excited states) via top quark decays, t→(bc¯)+c+W+, are studied within the non-relativistic QCD framework. It is found that the dimensionless reduced decay width for a particular (bc¯)-quarkonium state, [Formula: see text] , is very sensitive to the c-quark mass, while the uncertainties from the b-quark and t-quark masses are small, where n stands for the eight (bc¯)-quarkonium states up to O(v4): |(bc¯)(S01)1〉, |(bc¯)(S13)1〉, |(bc¯)(P11)1〉, |(bc¯)(PJ3)1〉 (with J=(1,2,3)), |(bc¯)(S01)8g〉 and |(bc¯)(S13)8g〉 respectively. About 108tt¯-pairs shall be produced per year at CERN LHC, if adopting the assumption that all the higher Fock states decay to the ground state with 100% probability, then we shall have (1.038−0.782+1.353)×105Bc−events per year. So the indirect production provides another important way to study the properties of Bc−meson in comparison to that of the direct hadronic production at CERN LHC.
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