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Observation of Excess Electronic Recoil Events in XENON1T | | E. Aprile
; J. Aalbers
; F. Agostini
; M. Alfonsi
; L. Althueser
; F. D. Amaro
; V. C. Antochi
; E. Angelino
; J. R. Angevaare
; F. Arneodo
; D. Barge
; L. Baudis
; B. Bauermeister
; L. Bellagamba
; M. L. Benabderrahmane
; T. Berger
; A. Brown
; E. Brown
; S. Bruenner
; G. Bruno
; R. Budnik
; C. Capelli
; J. M. R. Cardoso
; D. Cichon
; B. Cimmino
; M. Clark
; D. Coderre
; A. P. Colijn
; J. Conrad
; J. P. Cussonneau
; M. P. Decowski
; A. Depoian
; P. Di Gangi
; A. Di Giovanni
; R. Di Stefano
; S. Diglio
; A. Elykov
; G. Eurin
; A. D. Ferella
; W. Fulgione
; P. Gaemers
; R. Gaior
; M. Galloway
; F. Gao
; L. Grandi
; C. Hasterok
; C. Hils
; K. Hiraide
; L. Hoetzsch
; J. Howlett
; M. Iacovacci
; Y. Itow
; F. Joerg
; N. Kato
; S. Kazama
; M. Kobayashi
; G. Koltman
; A. Kopec
; H. Landsman
; R. F. Lang
; L. Levinson
; Q. Lin
; S. Lindemann
; M. Lindner
; F. Lombardi
; J. Long
; J. A. M. Lopes
; E. López Fune
; C. Macolino
; J. Mahlstedt
; A. Mancuso
; L. Manenti
; A. Manfredini
; F. Marignetti
; T. Marrodán Undagoitia
; K. Martens
; J. Masbou
; D. Masson
; S. Mastroianni
; M. Messina
; K. Miuchi
; K. Mizukoshi
; A. Molinario
; K. Morå
; S. Moriyama
; Y. Mosbacher
; M. Murra
; J. Naganoma
; K. Ni
; U. Oberlack
; K. Odgers
; J. Palacio
; B. Pelssers
; R. Peres
; J. Pienaar
; V. Pizzella
; G. Plante
; J. Qin
; H. Qiu
; D. Ramírez García
; S. Reichard
; A. Rocchetti
; N. Rupp
; J. M. F. dos Santos
; G. Sartorelli
; N. Šarčević
; M. Scheibelhut
; J. Schreiner
; D. Schulte
; M. Schumann
; L. Scotto Lavina
; M. Selvi
; F. Semeria
; P. Shagin
; E. Shockley
; M. Silva
; H. Simgen
; A. Takeda
; C. Therreau
; D. Thers
; F. Toschi
; G. Trinchero
; C. Tunnell
; M. Vargas
; G. Volta
; H. Wang
; Y. Wei
; C. Weinheimer
; M. Weiss
; D. Wenz
; C. Wittweg
; Z. Xu
; M. Yamashita
; J. Ye
; G. Zavattini
; Y. Zhang
; T. Zhu
; J. P. Zopounidis
; X. Mougeot
; | | Date: |
Wed, 17 Jun 2020 08:44:06 GMT (1855kb,AD) | | Abstract: | We report results from searches for new physics with low-energy electronic
recoil data recorded with the XENON1T detector. With an exposure of 0.65
tonne-years and an unprecedentedly low background rate of $76pm2_{stat}$
events/(tonne$ imes$year$ imes$keV) between 1-30 keV, the data enables
competitive searches for solar axions, an enhanced neutrino magnetic moment
using solar neutrinos, and bosonic dark matter. An excess over known
backgrounds is observed below 7 keV, rising towards lower energies and
prominent between 2-3 keV. The solar axion model has a 3.5$sigma$
significance, and a three-dimensional 90% confidence surface is reported for
axion couplings to electrons, photons, and nucleons. This surface is inscribed
in the cuboid defined by $g_{ae}<3.7 imes10^{-12}$,
$g_{ae}g_{an}^{eff}<4.6 imes10^{-18}$, and
$g_{ae}g_{agamma}<7.6 imes10^{-22}~{GeV}^{-1}$, and excludes either
$g_{ae}=0$ or $g_{ae}g_{agamma}=g_{ae}g_{an}^{eff}=0$. The neutrino magnetic
moment signal is similarly favored over background at 3.2$sigma$ and a
confidence interval of $mu_
uin(1.4,2.9) imes10^{-11} mu_B$ (90% C.L.) is
reported. Both results are in tension with stellar constraints. The excess can
also be explained by $eta$ decays of tritium, which was initially not
considered, at 3.2$sigma$ significance with a corresponding tritium
concentration in xenon of $(6.2pm2.0) imes10^{-25}$ mol/mol. Such a trace
amount can be neither confirmed nor excluded with current knowledge of
production and reduction mechanisms. The significances of the solar axion and
neutrino magnetic moment hypotheses are decreased to 2.1$sigma$ and
0.9$sigma$, respectively, if an unconstrained tritium component is included in
the fitting. This analysis also sets the most restrictive direct constraints to
date on pseudoscalar and vector bosonic dark matter for most masses between 1
and 210 keV/c$^2$. | | Source: | arXiv, 2006.9721 | | Services: | Forum | Review | PDF | Favorites | |
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