On the four-quark operator matrix elements for the lifetime of $\Lambda_{b}$

Autor:	Zhao, Zhen-Xing, Sun, Xiao-Yu, Zhang, Fu-Wei, Xing, Zhi-Peng
Rok vydání:	2021
Předmět:	High Energy Physics - Phenomenology
Druh dokumentu:	Working Paper
Popis:	Heavy quark expansion can nicely explain the lifetime of $\Lambda_{b}$. However, there still exist sizable uncertainties from the four-quark operator matrix elements of $\Lambda_{b}$ in $1/m_{b}^{3}$ corrections, which describe the spectator effects. In this work, these four-quark operator matrix elements are investigated using full QCD sum rules for the first time. At the QCD level, contributions from up to dimension-6 four-quark operators are considered. Our method of calculating high-dimensional operator matrix elements is promising to be used to resolve the $\Omega_{c}$ lifetime puzzle. Comment: 13 pages, 4 figures; version accepted by EPJC
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/2101.11874 Zobrazit plný text záznamu View this record from Arxiv