Background Rejection in the DMTPC Dark Matter Search Using Charge Signals
Abstract
The Dark Matter Time Projection Chamber (DMTPC) collaboration is developing low-pressure gas TPC detectors for measuring WIMP-nucleon interactions. Optical readout with CCD cameras allows for the detection for the daily modulation in the direction of the dark matter wind, while several charge readout channels allow for the measurement of additional recoil properties. In this article, we show that the addition of the charge readout analysis to the CCD allows us too obtain a statistics-limited 90% C.L. upper limit on the rejection factor of for recoils with energies between 40 and 200 keV. In addition, requiring coincidence between charge signals and light in the CCD reduces CCD-specific backgrounds by more than two orders of magnitude.
Cite
@article{arxiv.1109.3501,
title = {Background Rejection in the DMTPC Dark Matter Search Using Charge Signals},
author = {J. P. Lopez and S. Ahlen and J. Battat and T. Caldwell and M. Chernicoff and C. Deaconu and D. Dujmic and A. Dushkin and W. Fedus and P. Fisher and F. Golub and S. Henderson and A. Inglis and A. Kaboth and G. Kohse and L. Kirsch and R. Lanza and A. Lee and J. Monroe and H. Ouyang and T. Sahin and G. Sciolla and N. Skvorodnev and H. Tomita and H. Wellenstein and I. Wolfe and R. Yamamoto and H. Yegoryan},
journal= {arXiv preprint arXiv:1109.3501},
year = {2015}
}
Comments
8 pages, 6 figures. For proceedings of DPF 2011 conference