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Search for Electronic Recoil Event Rate Modulation with 4 Years of XENON100 Data
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Number of Authors: 113
2017 (English)In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 118, no 10, 101101Article in journal (Refereed) Published
Abstract [en]

We report on a search for electronic recoil event rate modulation signatures in the XENON100 data accumulated over a period of 4 yr, from January 2010 to January 2014. A profile likelihood method, which incorporates the stability of the XENON100 detector and the known electronic recoil background model, is used to quantify the significance of periodicity in the time distribution of events. There is a weak modulation signature at a period of 431(-14)(+16) day in the low energy region of (2.0-5.8) keV in the single scatter event sample, with a global significance of 1.9 sigma; however, no other more significant modulation is observed. The significance of an annual modulation signature drops from 2.8 sigma, from a previous analysis of a subset of this data, to 1.8 sigma with all data combined. Single scatter events in the low energy region are thus used to exclude the DAMA/LIBRA annual modulation as being due to dark matter electron interactions via axial vector coupling at 5.7 sigma.

Place, publisher, year, edition, pages
2017. Vol. 118, no 10, 101101
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:su:diva-141208DOI: 10.1103/PhysRevLett.118.101101ISI: 000396046100002PubMedID: 28339273OAI: oai:DiVA.org:su-141208DiVA: diva2:1090690
Available from: 2017-04-25 Created: 2017-04-25 Last updated: 2017-04-25Bibliographically approved

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Bauermeister, BorisCalvén, JakobConrad, JanFerella, Alfredo D.
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Department of PhysicsThe Oskar Klein Centre for Cosmo Particle Physics (OKC)
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