arXiv subjects

Manvinder Pal Singh

Publications and source records attributed to Manvinder Pal Singh.

3 recordsLinked to original sources

arXiv2023

Light Dark Matter Detection and Neutrino Floor: Role of Anomalous $(g-2)_μ$

In this work, we explore the impact of dark matter (DM) relic density and direct detection constraints on a GeV scale DM in the context of recent anomalous muon magnetic moment $(g-2)_μ$ measurement; a $ 5.1 σ$ discrepancy with the SM. In $U(1)_{L_μ-L_τ}$ scenario the additional $Z'$ boson modifies the $(g-2)_μ$ value readily explaining the discrepancy, which restricts the $Z^{\prime}$ mass in the range of $20-200$~MeV. Bounds imposed on the $Z^{\prime}$ mass along with the gauge coupling, limit possible enhancement of the neutrino floor in an $U(1)_{L_μ-L_τ}$ model. Neutrino floor is enhanced for a lighter $Z^{\prime}$ inside the $(g-2)_μ$ allowed parameter space, whereas for a heavier $Z^{\prime}$, enhancement is less significant. The $(g-2)_μ$ constraint for the GeV scale Fermionic DM makes s-channel resonant annihilation insignificant, placing emphasis on a t-channel reliance to create the observed DM relic. Although a t-channel annihilation aided by relatively large couplings can explain the measured relic density, it increases the direct detection cross-section of the GeV DM. Consequently, super-GeV (with mass $1-10$~GeV) DM almost gets ruled out except for a small parameter region with heavier $Z^{\prime}$, whereas sub-GeV (with mass $0.1-1$~GeV) DM detection possibility remains bright with more detection possibility for heavier $Z^{\prime}$. In our analysis, we have discovered that direct detection constraints have a greater impact on the GeV DM compared to indirect detection measurements.

hep-ph↗

arXiv2021

Neutrino Floor in Leptophilic $U(1)$ Models: Modification in $U(1)_{L_μ-L_τ}$

In this work, we investigate the beyond standard model (BSM) impact of leptophilic U(1) models, namely $ U(1)_{L_μ-L_e}$, $U(1)_{L_e-L_τ}$ and $U(1)_{L_μ-L_τ}$ on coherent elastic neutrino-nucleus scattering (CE$ν$NS) and hence its effect on dark matter (DM) direct detection experiments. Imposing the latest relevant experimental constraints on these models, we obtain $\mathcal{O}(50\%)$ enhancement for case of $U(1)_{L_μ-L_τ}$ in a region $m_Z' \approx 20~$MeV. Subsequently, we observe that the enhancement seen in CE$ν$NS is roughly getting translated to enhancement by a factor of 2.7 (for Germanium based detectors) and 1.8 (for Xenon based detectors) in the neutrino scattering event rate which eventually enhances the neutrino floor by same amount. This enhancement is more prominent in the region with DM masses less than 10 GeV. The model parameter space that leads to this enhancement, can simultaneously explain both anomalous magnetic moment of muon ($(g-2)_μ$) and observed DM relic density, in a modified scenario. Enhancement of neutrino floor requires increased number of DM-nucleon scattering events in the future DM direct detection experiments, to establish themselves to be DM signal events. In absence of any DM signal, those experiments can directly be used to measure the neutrino rate, quantifying the BSM effects.

hep-ph↗

arXiv2019

Lepto-philic 2-HDM + singlet scalar portal induced fermionic dark matter

We explore the possibility that the discrepancy in the observed anomalous magnetic moment of the muon $Δa _μ$ and the predicted relic abundance of Dark Matter by Planck data, can be explained in a lepto-philic 2-HDM augmented by a real SM singlet scalar of mass $\sim$ 10-80 GeV. We constrain the model from the observed Higgs Decay width at LHC, LEP searches for low mass exotic scalars and anomalous magnetic moment of an electron $Δa_e$. This constrained light singlet scalar serves as a portal for the fermionic Dark Matter, which contributes to the required relic density of the universe. A large region of model parameter space is found to be consistent with the present observations from the Direct and Indirect DM detection experiments.

hep-ph↗