QCD corrections at subleading power for inclusive nonleptonic𝑏→𝑐⁢¯𝑢⁢𝑑decays

IF 5 2区物理与天体物理 Q1 Physics and Astronomy

Physical Review D Pub Date : 2024-11-07 DOI:10.1103/physrevd.110.094011

Thomas Mannel, Daniel Moreno, Alexei A. Pivovarov

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引用次数: 0

Abstract

In this paper we compute the next-to-leading order (NLO) QCD corrections for the inclusive nonleptonic decay rates of

𝐵

hadrons at subleading power of the heavy quark expansion. In particular, we discuss the coefficient of the chromomagnetic moment parameter

𝜇 𝐺

, which has a large uncertainty at leading order due to its dependence on the renormalization scale. We find that the renormalization-scale dependence of this coefficient is significantly reduced, thereby reducing the theoretical uncertainty of the coefficient and, consequently, the rates. The sign of the coefficient becomes stable, and we estimate that the NLO corrections will increase the decay rates by around 2%.

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包容性非轻子𝑏→𝑐¯𝑢𝑑衰变的次引功率 QCD 校正

在本文中，我们计算了在重夸克扩展的次引导幂下𝐵强子的包容性非轻子衰变率的次引导阶（NLO）QCD修正。我们特别讨论了色磁矩参数𝜇ᵃ的系数，由于它依赖于重正化尺度，因此在前沿阶具有很大的不确定性。我们发现，该系数的重正化尺度依赖性大大降低，从而降低了系数的理论不确定性，进而降低了速率。系数的符号变得稳定，我们估计 NLO 修正将使衰变率提高约 2%。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Physical Review D 物理-天文与天体物理

CiteScore

9.20

自引率

36.00%

发文量

审稿时长

2 months

期刊介绍： Physical Review D (PRD) is a leading journal in elementary particle physics, field theory, gravitation, and cosmology and is one of the top-cited journals in high-energy physics. PRD covers experimental and theoretical results in all aspects of particle physics, field theory, gravitation and cosmology, including: Particle physics experiments, Electroweak interactions, Strong interactions, Lattice field theories, lattice QCD, Beyond the standard model physics, Phenomenological aspects of field theory, general methods, Gravity, cosmology, cosmic rays, Astrophysics and astroparticle physics, General relativity, Formal aspects of field theory, field theory in curved space, String theory, quantum gravity, gauge/gravity duality.