Implications of the latest XENON100 and cosmic ray antiproton data for isospin-violating dark matter

Abstract

In the scenario of isospin violating dark matter (IVDM), the dark matter (DM) spin-independent couplings to protons and to neutrons are allowed to be different, which has been considered to relax the tensions between the results of DAMA, CoGeNT and XENON experiments. We explore the allowed values of DM-nucleon couplings favored and excluded by the current experiments under the assumption of IVDM. We find that the recently updated XENON100 result excludes the main part of the overlapping signal region between DAMA and CoGeNT. We also show that the possible tensions between some experiments such as that between DAMA and SIMPLE are unlikely to be affected by isospin violating interactions. In an effective operator approach, we investigate conservative upper bounds on the DM-quark couplings required by the IVDM scenario from the cosmic ray antiproton fluxes measured recently by BESS-Polar II and PAMELA, and that from the relic density. The results show that the relatively large couplings favored by DAMA and CoGeNT are tightly constrained, if the operators contribute to velocity-independent annihilation cross sections. For thermal relic DM, the upper bounds from the relic density can also be stringent. *

Implications of the first AMS-02 antiproton data for dark matter

“…The constraints on the DM properties from antiprotons have been investigated previously before AMS-02 ( see e.g. [17][18][19][20][21] ). In this talk, we briefly summarise our work on the implications of the new AMS-02p/p data for constraining the annihilation cross sections of the DM particles in various propagation models and DM profiles.…”

A combined analysis of PandaX, LUX, and XENON1T experiments within the framework of dark matter effective theory

“…In many ISV studies [55][56][57][58][59][60][61][62][63][64][65][66], the ISV coupling ratio for maximum cancellation between the DM-proton contribution and the DM-neutron contribution is defined at the amplitude level. Unlike such traditional definitions, we define our ISV coupling ratio for maximum cancellation at the event rate level, in which we take the experimental efficiencies and the DM velocity distribution into account.…”

Constraints on dark matter interactions from the first results of DarkSide-50

“…Thus it is possible that the σ p value can be a few order of magnitudes larger than σ IC p . For a given single target material T, the particular value of f n /f p corresponding to the maximal possible value of K(f n /f p ) can be written by [26]…”

“…The interpretations of the experimental data can be changed dramatically if some of the assumptions is modified. In order to reconcile the conflicts among the experiments, several mechanisms have been discussed, such as the isospin violating interactions [24][25][26], the light WIMPs-nucleus mediators [27][28][29], exothermic scattering [28][29][30][31][32], the different DM velocity profile [33][34][35][36] and halo-independent [37-39] ,etc.In this work, we reinterpret the results from CDMS-II-Si with the new data from DarkSide-50 [14], XENON1T [13], CDEX-10 [23], etc., in the extended effective operator framework [27,[40][41][42][43] with both isospin violating interactions and light mediators. The effective operator framework is actually the secluded DM scenario, where the DM and the mediator compose a hidden DM sector.…”