Title

Is DAMAs modulation amplitude changing with time?

Document Type

Conference Proceeding

Publication Date

6-21-2016

Subject Area

ARRAY(0x55ab97387008)

Abstract

If dark matter is composed of weakly interacting particles, Earth's orbital motion induces a small annual variation in the rate at which these particles interact in a terrestrial detector. The DAMA collaboration has identified at a 9.3σ confidence level (CL) such an annual modulation in their event rate over two detector iterations, DAMA/NaI and DAMA/LIBRA, each with about 7 years of observations. We examine the nature of this modulation signal and find the modulation amplitude for the two detectors is inconsistent at the 3σ CL over 2-6 keVee. Such a time-dependence in the modulation amplitude is unexpected behavior for a dark matter signal, at least for dark matter halo morphologies consistent with the DAMA signal. We also find unusual behavior over the 5-6 keVee energy range that might indicate problems with the data.

Publication Title

AIP Conference Proceedings

Volume

1743

Digital Object Identifier (DOI)

10.1063/1.4953308

ISSN

0094243X

E-ISSN

15517616

ISBN

9780735414006

Share

COinS