COSINE-100 and DAMA/LIBRA-phase2 in WIMP effective models
Abstract
Assuming a standard Maxwellian for the WIMP velocity distribution, we obtain the bounds from null WIMP search results of 59.5 days of COSINE-100 data on the DAMA/LIBRA-phase2 modulation effect within the context of the non-relativistic effective theory of WIMP-nucleus scattering. Here, we systematically assume that one of the effective operators allowed by Galilean invariance dominates in the effective Hamiltonian of a spin-1/2 dark matter (DM) particle. We find that, although DAMA/LIBRA and COSINE-100 use the same sodium-iodide target, the comparison of the two results still depends on the particle-physics model. This is mainly due to two reasons: i) the WIMP signal spectral shape; ii) the expected modulation fractions, when the upper bound on the time-averaged rate in COSINE-100 is converted into a constraint on the annual modulation component in DAMA/LIBRA. We find that the latter effect is the dominant one. For several effective operators the expected modulation fractions are larger than in the standard spin-independent or spin-dependent interaction cases. As a consequence, compatibility between the modulation effect observed in DAMA/LIBRA and the null result from COSINE-100 is still possible for several non-relativistic operators. At low WIMP masses such relatively high values of the modulation fractions arise because COSINE-100 is mainly sensitive to WIMP-sodium scattering events, due to the higher threshold compared to DAMA/LIBRA. A next COSINE analysis is expected to have a full sensitivity for the 5 region of DAMA/LIBRA.
Cite
@article{arxiv.1904.00128,
title = {COSINE-100 and DAMA/LIBRA-phase2 in WIMP effective models},
author = {100 Collaboration and G. Adhikari and P. Adhikari and E. Barbosa de Souza and N. Carlin and S. Choi and M. Djamal and A. C. Ezeribe and C. Ha and I. S. Hahn and E. J. Jeon and J. H. Jo and H. W. Joo and W. G. Kang and W. Kang and M. Kauer and G. S. Kim and H. Kim and H. J. Kim and K. W. Kim and N. Y. Kim and S. K. Kim and Y. D. Kim and Y. H. Kim and Y. J. Ko and V. A. Kudryavtsev and H. S. Lee and J. Lee and J. Y. Lee and M. H. Lee and D. S. Leonard and W. A. Lynch and R. H. Maruyama and F. Mouton and S. L. Olsen and B. J. Park and H. K. Park and H. S. Park and K. S. Park and R. L. C. Pitta and H. Prihtiadi and S. J. Ra and C. Rott and K. A. Shin and A. Scarff and N. J. C. Spooner and W. G. Thompson and L. Yang and G. H. Yu. The Sogang Phenomenology Group and : and Sunghyun Kang and Stefano Scopel and Gaurav Tomar and Jong-Hyun Yoon},
journal= {arXiv preprint arXiv:1904.00128},
year = {2019}
}
Comments
22 pages, 6 figures, 5 tables. Updated to published version