On the four-quark operator matrix elements for the lifetime of Λ_b

2021/01/28 by Zhao, Zhen-Xing, Sun, Xiao-Yu, Zhang, Fu-Wei +1
#FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph)

paper · doi:10.48550/arxiv.2101.11874

Abstract

Heavy quark expansion can nicely explain the lifetime of Λ_b. However, there still exist sizable uncertainties from the four-quark operator matrix elements of Λ_b in 1/m_b³ 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 Ω_c lifetime puzzle.

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