Dark matter, muon anomalous magnetic moment, and the XENON1T excess

Debajyoti Choudhury,Vandana Sahdev,Suvam Maharana,Divya Sachdeva

doi:10.1103/physrevd.103.015006

Abstract

A very economic scenario with just three extra scalar fields beyond the Standard Model is invoked to explain the muon anomalous magnetic moment, the requisite relic abundance of dark matter as well as the XENON1T excess through the inelastic down-scattering of the dark scalar.

Highlights

The observation of an excess in the electronic recoil events at the XENON1T detector [1] has elicited much activity, especially in the context of dark matter (DM)
With yμ constrained from ðg − 2Þμ, we plot, in Fig. 3, the dependence of the DM relic abundance on gωφφ as a function of the mediator mass mω for a given DM mass
We present a very economical model that simultaneously explains the XENON1T excess, as well as the anomalous magnetic moment of the muon while producing the requisite dark matter relic density

Summary

INTRODUCTION

The observation of an excess in the electronic recoil events at the XENON1T detector [1] has elicited much activity, especially in the context of dark matter (DM). The very structure of the excess demands that the DM particle be relatively light, and that the recoil energy satisfy 1 keV ≲ Erec ≲ 5 keV. We point out that a relatively simple model can satisfy all such constraints and successfully address another long-standing issue that the Standard Model (SM) faces, namely an explanation of aμ, the anomalous magnetic moment of the muon It promises exciting signals at currently operating experiments. There are some advantages to choosing a scalar mediator as opposed to the more popular dark photon It is the most economic construction in terms of field content. Ω can both be the mediator as well as potentially engender the mass split required for down-scattering. On the other hand, when allowed, the partial widths of ω into leptonic and scalar channels are given, respectively, by (here, βX ≡ ð1 − 4m2X=m2ωÞ1=2)

Anomalous magnetic moment of the muon

DIRECT DETECTION VIA ELECTRON RECOIL

RELIC ABUNDANCE

OTHER COSMOLOGICAL CONSTRAINTS

SUMMARY AND OUTLOOK