Model-Independent Tests of the Hadronic Vacuum Polarization Contribution to the Muon g−2

IF 8.1 1区物理与天体物理 Q1 PHYSICS, MULTIDISCIPLINARY

Physical review letters Pub Date : 2025-01-06 DOI:10.1103/physrevlett.134.011902

Luca Di Luzio, Alexander Keshavarzi, Antonio Masiero, Paride Paradisi

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引用次数: 0

Abstract

The hadronic vacuum polarization (HVP) contributions to the muon g−2 are the crucial quantity to resolve whether new physics is present or not in the comparison between the standard model (SM) prediction and experimental measurements at Fermilab. They are commonly and historically determined via dispersion relations using a vast catalogue of experimentally measured, low-energy e+e−→hadrons cross section data as input. These dispersive estimates result in a SM prediction that exhibits a muon g−2 discrepancy of more than 5σ when compared to experiment. However, recent lattice QCD evaluations of the HVP and a new hadronic cross section measurement from the CMD-3 experiment favor a no-new-physics scenario and, therefore, exhibit a common tension with the previous e+e−→hadrons data. This study explores the current and future implications of these two scenarios on other observables that are also sensitive to the HVP contributions in the hope that they may provide independent tests of the current tensions observed in the muon g−2.

Published by the American Physical Society

2025

查看原文本刊更多论文

强子真空极化对μ子g−2贡献的模型无关测试

在费米实验室的标准模型（SM）预测和实验测量之间的比较中，强子真空极化（HVP）对μ子g−2的贡献是决定是否存在新物理的关键量。它们通常和历史上是通过色散关系来确定的，使用大量实验测量的低能e+e−→强子截面数据作为输入。这些色散估计的SM预测结果显示，与实验相比，μ子g−2的差异大于5σ。然而，最近对HVP的晶格QCD评估和来自CMD-3实验的新的强子截面测量支持无新物理场景，因此，与之前的e+e−→强子数据显示出共同的张力。本研究探讨了这两种情况对其他对HVP贡献敏感的可观测物的当前和未来的影响，希望它们可以为μ子g−2中观测到的当前张力提供独立的测试。2025年由美国物理学会出版

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来源期刊

Physical review letters 物理-物理：综合

CiteScore

16.50

自引率

7.00%

发文量

2673

审稿时长

2.2 months

期刊介绍： Physical review letters(PRL)covers the full range of applied, fundamental, and interdisciplinary physics research topics: General physics, including statistical and quantum mechanics and quantum information Gravitation, astrophysics, and cosmology Elementary particles and fields Nuclear physics Atomic, molecular, and optical physics Nonlinear dynamics, fluid dynamics, and classical optics Plasma and beam physics Condensed matter and materials physics Polymers, soft matter, biological, climate and interdisciplinary physics, including networks