The SVZ sum rules and the heavy quark limit for Λ_Q

2020/05/11 by Z. G. Zhao, Zhao, Zhen-Xing, Run-Hui Li +5
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.2005.05279

openalex publication_date 2020/05/11 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

Abstract

In this work, we evaluate the accuracy of the leading order results in\nShifman-Vainshtein-Zakharov (SVZ) sum rules and the leading power results in\nthe heavy quark limit for the mass of \Λ_Q. Up to dim-5 condensate\ncontributions are considered. By comparing with the experimental results, we\nfind that the leading order results in SVZ sum rules can reach about 5 %\naccuracy both for \Λ_b and \Λ_c, and it seems that better\nresults can be obtained from the sum rules of the heavy quark limit both for\n\Λ_b and \Λ_c. We re-check that the SVZ sum rules in the\nheavy quark limit coincide with the HQET sum rules. As a byproduct, we also\nhave an exploratory discussion on the ud diquark in \Λ_Q.\n

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