Contributions of axionlike particles to lepton dipole moments

被引：125

作者：

Marciano, W. J. ^{[1
]}

Masiero, A. ^{[2
,3
]}

Paradisi, P. ^{[2
,3
]}

Passera, M. ^{[3
]}

机构：

[1] Brookhaven Natl Lab, Dept Phys, Upton, NY 11973 USA

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

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

来源：

PHYSICAL REVIEW D | 2016年 / 94卷 / 11期

基金：

欧盟地平线“2020”;

关键词：

ANOMALOUS MAGNETIC-MOMENT; MUON G-2; HADRONIC CONTRIBUTION; 0.7; PPM; ELECTRON; ORDER; MECHANISM; DETECTOR; PHYSICS; EDM;

D O I：

10.1103/PhysRevD.94.115033

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Contributions of a spin-0 axionlike particle (ALP) to lepton dipole moments, g - 2 and EDMs are examined. Barr-Zee and light-by-light loop effects from a light pseudoscalar ALPlease note thathP are found to be capable of resolving the longstanding muon g - 2 discrepancy at the expense of relatively large ALP-gamma gamma couplings. The compatibility of such large couplings with direct experimental constraints and perturbative unitarity bounds is discussed. Future tests of such a scenario are described. For CP-violating ALP couplings, the electron EDM is found to probe much smaller, theoretically more easily accommodated ALP interactions. Future planned improvement in electron EDM searches is advocated as a way to not only significantly constrain ALP parameters, but also potentially unveil a new source of CP violation which could have far-reaching ramifications.

引用

页数：7

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