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First results on the scalar WIMP-pion coupling, using the XENON1T experiment
Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum. Nikhef, Netherlands; University of Amsterdam, Netherlands.
Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum. Stockholms universitet, Naturvetenskapliga fakulteten, Oskar Klein-centrum för kosmopartikelfysik (OKC).
Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum. Stockholms universitet, Naturvetenskapliga fakulteten, Oskar Klein-centrum för kosmopartikelfysik (OKC).
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Antal upphovsmän: 131 (Engelska)Manuskript (preprint) (Övrigt vetenskapligt)
Abstract [en]

We present first results on the scalar WIMP-pion coupling 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 non-relativistic 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 6.4×10−46 cm2 (90 % confidence level) at 30 GeV/c2 WIMP mass.

Nyckelord [en]
Dark matter, wimps, direct detection
Nationell ämneskategori
Astronomi, astrofysik och kosmologi
Forskningsämne
fysik
Identifikatorer
URN: urn:nbn:se:su:diva-163387OAI: oai:DiVA.org:su-163387DiVA, id: diva2:1274348
Anmärkning

131 total authors (XENON collaboration, M. Hoferichter, P. Klos, J. Menéndez and A. Schwenk).

Tillgänglig från: 2018-12-30 Skapad: 2018-12-30 Senast uppdaterad: 2019-01-06
Ingår i avhandling
1. Statistical Modelling and Inference for XENON1T
Öppna denna publikation i ny flik eller fönster >>Statistical Modelling and Inference for XENON1T
2019 (Engelska)Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
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.

Ort, förlag, år, upplaga, sidor
Stockholm: Department of Physics, Stockholm University, 2019. s. 116
Nyckelord
Dark matter, direct detection, statistical analysis
Nationell ämneskategori
Astronomi, astrofysik och kosmologi
Forskningsämne
fysik
Identifikatorer
urn:nbn:se:su:diva-163390 (URN)978-91-7797-566-3 (ISBN)978-91-7797-567-0 (ISBN)
Disputation
2019-02-25, FA31, Albanova, Roslagstullsbacken 21, Stockholm, 10:00 (Engelska)
Opponent
Handledare
Anmärkning

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.

Tillgänglig från: 2019-01-31 Skapad: 2019-01-06 Senast uppdaterad: 2019-02-28Bibliografiskt granskad

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arXiv:1811.12482

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Av författaren/redaktören
Aalbers, JelleAntochi, Vasile CristianBauermeister, BorisConrad, JanFerella, Alfredo DavideMahlstedt, JörnMorå, KnutPelssers, Bart
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FysikumOskar Klein-centrum för kosmopartikelfysik (OKC)
Astronomi, astrofysik och kosmologi

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