The kinetic dark-mixing in the light of CoGENT and XENON100

TL;DR

This paper investigates a dark U(1)_D gauge boson interacting via kinetic mixing, analyzing its compatibility with recent experimental data and identifying parameter regions that could explain observed dark matter signals.

Contribution

It provides a detailed calculation of dark matter abundance and experimental constraints for kinetically mixed dark photons, highlighting viable parameter space for light WIMPs.

Findings

A region with M_{Z_D}< 40 GeV and 10^-4 < delta < 10^-3 remains viable.

A kinetic mixing delta ~ 10^-3 can explain DAMA/CoGENT/CRESST excesses for M_{Z_D}< 30 GeV.

Light WIMPs with specific kinetic mixing values are not excluded by current data.

Abstract

Several string or GUT constructions motivate the existence of a dark U(1)_D gauge boson which interacts with the Standard Model only through its kinetic mixing. We compute the dark matter abundance in such scenario and the constraints in the light of the recent data from CoGENT, CDMSII and XENON100. We show in particular that a region with relatively light WIMPS, M_{Z_D}< 40 GeV and a kinetic mixing 10^-4 < delta < 10^-3 is not yet excluded by the last experimental data and seems to give promising signals in a near future. We also compute the value of the kinetic mixing needed to explain the DAMA/CoGENT/CRESST excesses and find that for M_{Z_D}< 30 GeV, delta ~ 10^-3 is sufficient to fit with the data.