Interplay between scintillation and ionization in liquid xenon Dark Matter searches |
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Authors: | Fedor Bezrukov Felix Kahlhoefer Manfred Lindner |
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Affiliation: | a Max-Planck-Institut für Kernphysik, Postfach 103980, D-69029 Heidelberg, Germany b Theoretische Teilchenphysik, Ludwig-Maximilians-Universität München, Theresienstr. 37, 80333 München, Germany c Rudolf Peierls Centre for Theoretical Physics, University of Oxford, Oxford OX1 3NP, United Kingdom |
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Abstract: | We provide a new way of constraining the relative scintillation efficiency Leff for liquid xenon. Using a simple estimate for the electronic and nuclear stopping powers together with an analysis of recombination processes we predict both the ionization and the scintillation yields. Using presently available data for the ionization yield, we can use the correlation between these two quantities to constrain Leff from below. Moreover, we argue that more reliable data on the ionization yield would allow to verify our assumptions on the atomic cross sections and to predict the value of Leff. We conclude that the relative scintillation efficiency should not decrease at low nuclear recoil energies, which has important consequences for the robustness of exclusion limits for low WIMP masses in liquid xenon Dark Matter searches. |
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Keywords: | Dark Matter search Liquid xenon WIMP Relative scintillation efficiency |
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