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First Results on the Scalar WIMP-Pion Coupling, Using the XENON1T Experiment
Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC). Nikhef and the University of Amsterdam, Netherland.
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Number of Authors: 1332019 (English)In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 122, no 7, article id 071301Article in journal (Refereed) Published
Abstract [en]

We present first results on the scalar coupling of weakly interacting massive particles (WIMPs) to pions from 1 t yr of exposure with the XENON1T experiment. This interaction is generated when the WIMP couples to a virtual pion exchanged between the nucleons in a nucleus. In contrast to most nonrelativistic operators, these pion-exchange currents can be coherently enhanced by the total number of nucleons and therefore may dominate in scenarios where spin-independent WIMP-nucleon interactions are suppressed. Moreover, for natural values of the couplings, they dominate over the spin-dependent channel due to their coherence in the nucleus. Using the signal model of this new WIMP-pion channel, no significant excess is found, leading to an upper limit cross section of 6.4 x 10(-46) cm(2) (90% confidence level) at 30 GeV/c(2) WIMP mass.

Place, publisher, year, edition, pages
2019. Vol. 122, no 7, article id 071301
National Category
Physical Sciences
Research subject
Physics
Identifiers
URN: urn:nbn:se:su:diva-167516DOI: 10.1103/PhysRevLett.122.071301ISI: 000459311800003PubMedID: 30848617OAI: oai:DiVA.org:su-167516DiVA, id: diva2:1305978
Available from: 2019-04-21 Created: 2019-04-21 Last updated: 2019-12-12Bibliographically approved
In thesis
1. Statistical Modelling and Inference for XENON1T
Open this publication in new window or tab >>Statistical Modelling and Inference for XENON1T
2019 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

A great number of astrophysical observations suggests that of the matter in our universe, only a sixth is made up of known matter. The rest, named dark matter, has not been successfully identified. This thesis presents the analysis and statistical inference that was used by the XENON1T collaboration to conduct a search for a particular dark matter candidate; weakly interacting massive particles (WIMPs).

 

XENON1T is a dual-phase time projection chamber that can detect particles scattering in a 2 tonne target of liquid xenon with deposited recoil energies above ~3 keV. This is low enough to observe the elastic recoil between a WIMP and a xenon nucleus for WIMP masses >5 GeV c-2.

The results presented in this thesis use 278.8 days of data, with an analysis mass of 1.3 tonne.

 

XENON1T uses models for backgrounds and signals within this volume to construct a combined likelihood for two science data-taking periods as well as calibration data-sets. Fits to simulated data-sets were used to calibrate and validate the confidence interval construction. In addition, analysis choices were evaluated both to optimize the discovery power and expected sensitivity of the search, and to improve the robustness of the analysis.

 

No significant excess was observed in the search for a spin-independent WIMP-nucleon interaction for any WIMP masses between 6  GeV c-2 and 104 GeV c-2 for the 1 ton-year exposure. This analysis produced the strongest constraint on the spin-independent WIMP-nucleon cross-section so far, with a minimum of 4.1 10-47 cm2  for a 30 GeV c-2 WIMP.

Place, publisher, year, edition, pages
Stockholm: Department of Physics, Stockholm University, 2019. p. 116
Keywords
Dark matter, direct detection, statistical analysis
National Category
Astronomy, Astrophysics and Cosmology
Research subject
Physics
Identifiers
urn:nbn:se:su:diva-163390 (URN)978-91-7797-566-3 (ISBN)978-91-7797-567-0 (ISBN)
Public defence
2019-02-25, FA31, Albanova, Roslagstullsbacken 21, Stockholm, 10:00 (English)
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Note

At the time of the doctoral defense, the following papers were unpublished and had a status as follows: Paper 3: Manuscript. Paper 4: Manuscript. Paper 5: Manuscript.

Available from: 2019-01-31 Created: 2019-01-06 Last updated: 2019-12-12Bibliographically approved

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Aalbers, JelleAmaro, F. D.Antochi, Vasile CristianBauermeister, BorisConrad, Jande Perio, P.Ferella, Alfredo D.Gao, F.Lindner, M.Mahlstedt, JörnMorå, KnutPelssers, BartSilva, M.Trinchero, G.Menendez, J.
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