What is the scale of new physics behind the muon g-2?

被引：16

作者：

Allwicher, Lukas ^{[1
]}

Di Luzio, Luca ^{[2
,3
]}

Fedele, Marco ^{[4
]}

Mescia, Federico ^{[5
]}

Nardecchia, Marco ^{[6
,7
]}

机构：

[1] Univ Zurich, Phys Inst, CH-8057 Zurich, Switzerland

[2] Univ Padua, Dipartimento Fis & Astron G Galilei, I-35131 Padua, Italy

[3] Ist Nazl Fis Nucl, Sez Padova, I-35131 Padua, Italy

[4] Karlsruhe Inst Technol, Inst Theoret Teilchenphys, D-76131 Karlsruhe, Germany

[5] Univ Barcelona, Dept Fis Quant & Astrofis, Inst Ciencies Cosmos ICCUB, Marti & Franques 1, E-08028 Barcelona, Spain

[6] Phys Dept, Piazzale Aldo Moro 5, I-00185 Rome, Italy

[7] INFN Sez Roma La Sapienza, Piazzale Aldo Moro 5, I-00185 Rome, Italy

来源：

PHYSICAL REVIEW D | 2021年 / 104卷 / 05期

基金：

瑞士国家科学基金会;

关键词：

D O I：

10.1103/PhysRevD.104.055035

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We study the constraints imposed by perturbative unitarity on the new physics interpretation of the muon g - 2 anomaly. Within a Standard Model effective field theory approach, we find that scattering amplitudes sourced by effective operators saturate perturbative unitarity at about 1 PeV. This corresponds to the highest energy scale that needs to be probed in order to resolve the new physics origin of the muon g - 2 anomaly. On the other hand, simplified models (e.g., scalar-fermion Yukawa theories) in which renormalizable couplings are pushed to the boundary of perturbativity still imply new on-shell states below 200 TeV. We finally suggest that the highest new physics scale responsible for the anomalous effect can be reached in nonrenormalizable models at the PeV scale.

引用

页数：11

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