Note on the Slope Parameter of the Baryonic \Lambda_b to \Lambda_c Isgur-Wise Function
高能物理 - 唯象学
2014-11-18 v1
摘要
Using the framework of the Heavy Quark Effective Theory we have re-analyzed the Isgur-Wise function describing semileptonic \Lambda_b to \Lambda_c decays in the QCD sum rule approach. The slope parameter of the Isgur-Wise function is found to be \rho^2 = 1.35 \pm 0.12, which is consistent with an experimental measurement and a lattice calculation. To O(1/m_b,1/m_c) of the heavy quark expansion the integrated \Lambda_b decay width is used to extract the CKM matrix element V_{cb} for which we obtain a value of |V_{cb}| = 0.041 \pm 0.004 in excellent agreement with the value of |V_{cb}| determined from semileptonic B to D^* decays.
引用
@article{arxiv.hep-ph/0502004,
title = {Note on the Slope Parameter of the Baryonic \Lambda_b to \Lambda_c Isgur-Wise Function},
author = {Ming-Qiu Huang and Hong-Ying Jin and J. G. Körner and Chun Liu},
journal= {arXiv preprint arXiv:hep-ph/0502004},
year = {2014}
}
备注
10 pages, 1 figure