Hidden sector explanation of B -decay and cosmic-ray anomalies

Abstract

There are presently several discrepancies in b → s + − decays of B mesons suggesting new physics coupling to b quarks and leptons. We show that a Z , with couplings to quarks and muons that can explain the B-decay anomalies, can also couple to dark matter in a way that is consistent with its relic abundance, direct detection limits, and hints of indirect detection. The latter include possible excess events in antiproton spectra recently observed by the AMS-02 experiment. We present two models, having a heavy (light) Z with m Z ∼ 600 (12) GeV and fermionic dark matter with mass mχ ∼ 50 (2000) GeV, producing excess antiprotons with energies of ∼ 10 (300) GeV. The first model is also compatible with fits for the galactic center GeV gamma-ray excess. arXiv:1702.00395v3 [hep-ph] 28 Apr 2017 [1] R. Aaij et al. [LHCb Collaboration], "Test of lepton universality using B + → K + + − decays," Phys. Rev. Lett. 113 (2014) 151601 [arXiv:1406.6482 [hep-ex]].

New physics in b→sμ+μ− after the measurement of Alok1, Bhattacharya2, Datta3 et al. 2017Phys. Rev. DSelf Cite16541970View full textAdd to dashboardCite

“…Since no such state has been observed, we consider the mass ranges m Z > m B and m Z < 2m µ . A Z in the first mass range may have implications for dark matter phenomenology [67], while a Z in the second mass range could explain the muon g − 2 measurement and have implications for nonstandard neutrino interactions [68]. For the first mass range we consider M Z = 10 GeV and refer to this as the GeV Z model, while in the second range we consider M Z = 200 MeV and call it the MeV Z model For the MeV Z model, we assume there is a flavor-changingsbZ vertex whose form is taken to be…”

New physics in b→sμ+μ− : Distinguishing models through CAlok1, Bhattacharya2, Kumar3 et al. 2017Phys. Rev. DSelf Cite786860View full textAdd to dashboardCite

“…Numerous models of this type have been proposed, see Refs. [36][37][38][39][40][41][42][43][44][45][46][47][48][49][50][51][52][53][54].…”

The waning of the WIMP? A review of models, searches, and constraints

“…Unlike the scalar case, this kind of scenario offers a much richer collider phenomenology since one could assume gauge-like interactions (contrary to Yukawa-like interactions for spin-0 mediators) of the mediator with the SM light quarks and leptons, leading to visible signals, implying stronger constraints [223][224][225][226][227][228][229][230][231][232][233][234][235][236][237][238][239][240][241]. As a consequence we will consider a wider mass range, for both DM and the spin-1 mediator, in our analysis.…”