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Liquid xenon scintillation measurements and pulse shape discrimination in the LUX dark matter detector

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arxiv 1802.06162 v2 pith:A2TAAQKZ submitted 2018-02-17 physics.ins-det

The LUX Collaboration: D.S. Akerib , S. Alsum , H.M. Araújo , X. Bai , A.J. Bailey , J. Balajthy , P. Beltrame , E.P. Bernard
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A. Bernstein T.P. Biesiadzinski E.M. Boulton P. Brás D. Byram M.C. Carmona-Benitez C. Chan A. Currie J.E. Cutter T.J.R. Davison A. Dobi E. Druszkiewicz B.N. Edwards S.R. Fallon A. Fan S. Fiorucci R.J. Gaitskell J. Genovesi C. Ghag M.G.D. Gilchriese C.R. Hall S.J. Haselschwardt S.A. Hertel D.P. Hogan M. Horn D.Q. Huang C.M. Ignarra R.G. Jacobsen W. Ji K. Kamdin K. Kazkaz D. Khaitan R. Knoche B.G. Lenardo K.T. Lesko J. Liao A. Lindote M.I. Lopes A. Manalaysay R.L. Mannino M.F. Marzioni D.N. McKinsey D.M. Mei J. Mock M. Moongweluwan J.A. Morad A.St.J. Murphy C. Nehrkorn H.N. Nelson F. Neves K. O'Sullivan K.C. Oliver-Mallory K.J. Palladino E.K. Pease C. Rhyne S. Shaw T.A. Shutt C. Silva M. Solmaz V.N. Solovov P. Sorensen T.J. Sumner M. Szydagis D.J. Taylor W.C. Taylor B.P. Tennyson P.A. Terman D.R. Tiedt W.H. To M. Tripathi L. Tvrznikova U. Utku S. Uvarov V. Velan J.R. Verbus R.C. Webb J.T. White T.J. Whitis M.S. Witherell F.L.H. Wolfs J. Xu K. Yazdani S.K. Young C. Zhang
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classification physics.ins-det
keywords darkdiscriminationeventsliquidmattermeasurementratioscintillation
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Weakly Interacting Massive Particles (WIMPs) are a leading candidate for dark matter and are expected to produce nuclear recoil (NR) events within liquid xenon time-projection chambers. We present a measurement of the scintillation timing characteristics of liquid xenon in the LUX dark matter detector and develop a pulse shape discriminant to be used for particle identification. To accurately measure the timing characteristics, we develop a template-fitting method to reconstruct the detection times of photons. Analyzing calibration data collected during the 2013-16 LUX WIMP search, we provide a new measurement of the singlet-to-triplet scintillation ratio for electron recoils (ER) below 46~keV, and we make a first-ever measurement of the NR singlet-to-triplet ratio at recoil energies below 74~keV. We exploit the difference of the photon time spectra for NR and ER events by using a prompt fraction discrimination parameter, which is optimized using calibration data to have the least number of ER events that occur in a 50\% NR acceptance region. We then demonstrate how this discriminant can be used in conjunction with the charge-to-light discrimination to possibly improve the signal-to-noise ratio for nuclear recoils.

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  1. Sensitivity of nEXO to $^{136}$Xe Charged-Current Interactions: Background-free Searches for Solar Neutrinos and Fermionic Dark Matter

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    A new delayed-coincidence tag from 136Cs isomers could let the nEXO detector reject backgrounds down to 10^-9 and measure CNO solar neutrinos, the 7Be neutrino energy, and sub-MeV fermionic dark matter.

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