Publication
Liquid xenon scintillation measurements and pulse shape discrimination in the LUX dark matter detector
| dc.contributor.author | LUX collaboration (92 authors) | |
| dc.contributor.author | Brás, P. | |
| dc.contributor.author | Lindote, A. | |
| dc.contributor.author | Lopes, M.I. | |
| dc.contributor.author | Neves, F. | |
| dc.contributor.author | Silva, C. | |
| dc.contributor.author | Solovov, V.N. | |
| dc.date.accessioned | 2019-02-05T15:58:37Z | |
| dc.date.available | 2019-02-05T15:58:37Z | |
| dc.date.issued | 2018-06-12 | |
| dc.date.updated | 2019-02-05T15:58:37Z | |
| dc.description.abstract | 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 2013–2016 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, to our knowledge, 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. | |
| dc.description.version | Peer Reviewed | |
| dc.identifier | Phys.Rev. D97 (2018) 112002; DOI 10.1103/PhysRevD.97.112002 | |
| dc.identifier.uri | http://dx.doi.org/10.1103/PhysRevD.97.112002 | |
| dc.identifier.uri | http://hdl.handle.net/10400.26/27582 | |
| dc.language.iso | eng | |
| dc.title | Liquid xenon scintillation measurements and pulse shape discrimination in the LUX dark matter detector | |
| dc.type | journal article | |
| dspace.entity.type | Publication | |
| rcaap.rights | openAccess | pt |
| rcaap.type | article |