Heavy quark expansion of Λ_b→Λ^*(1520) form factors beyond leading order

2021/01/28 by Marzia Bordone, Bordone, Marzia
Physics and Astronomy · #Black Holes and Theoretical Physics #FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph) #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions

paper · pdf · doi:10.48550/arxiv.2101.12028

openalex publication_date 2021/01/28 · openalex created_date 2024/04/11 · openalex updated_date 2026/07/28

Abstract

I review the parametrisation of the full set of Λ_b→Λ^* (1520) form factors in the framework of Heavy Quark Expansion, including next-to-leading-order O(α_s) and, for the first time, next-to-leading-power O(1/m_b) corrections. The unknown hadronic parameters are obtained by performing a fit to recent lattice QCD calculations. I investigate the compatibility of the Heavy Quark Expansion and the current lattice data, finding tension between these two approaches in the case of tensor and pseudo-tensor form factors, whose origin could come from an underestimation of the current lattice QCD uncertainties and higher order terms in the Heavy Quark Expansion.

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