Model independent analysis of MeV scale dark matter. II. Implications from 
<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msup><mml:mi>e</mml:mi><mml:mo>−</mml:mo></mml:msup><mml:msup><mml:mi>e</mml:mi><mml:mo>+</mml:mo></mml:msup></mml:math>
 colliders and direct detection

Pairs of Standard Model fermions form dimension-3 singlet operators that can couple to new dark sector states. This "fermion portal" is to be contrasted with the lower-dimensional Higgs, vector and neutrino singlet portals. We characterise its distinct phenomenology and place effective field theory bounds on this framework, focusing on the case of fermion portals to a pair of light dark sector fermions. We obtain current and projected limits on the dimension-6 effective operator scale from a variety of meson decay experiments, missing energy and long-lived particle searches at colliders, as well as astrophysical and cosmological bounds. The DarkEFT public code is made available for recasting these limits, which we illustrate with various examples including an integratedout heavy dark photon.

show abstract

“…For some recent works involving four-fermion operators with dark matter at the LHC, see e.g [35][36][37][38]…”

mentioning

confidence: 99%

Light dark sectors through the Fermion portal

Ellis

You

2020

J. High Energ. Phys.

View full text Add to dashboard Cite

show abstract

“…The required interaction strength is of the same order as what transpires naturally in our model and would leave such particles undetectable in the currently operative (satellite-based) indirect detection experiments [109]. Even more interestingly, such a DM is likely to be detectable not only at the next generation of direct detection experiments, but also at the Super-Belle detector [110].…”

Section: Jhep06(2020)111mentioning

confidence: 56%

Neutrino and Z′ phenomenology in an anomaly-free U(1) extension: role of higher-dimensional operators

Choudhury

Deka

Mandal

et al. 2020

J. High Energ. Phys.

Self Cite

View full text Add to dashboard Cite

We consider an anomaly-free U(1) extension of the Standard Model with three right-handed neutrinos (RHNs) and two complex scalars, wherein the charge assignments preclude all tree-level mass terms for the neutrinos. Considering this setup, in turn, to be only a low-energy effective theory, we introduce higher-dimensional terms a la Froggatt-Nielsen to naturally generate tiny neutrino masses. One of the RHNs turns out to be very light, thereby constituting the main decay mode for the Z and hence relaxing the LHC dilepton resonance search constraints. The lightest RHN has a lifetime comparable to or bigger than the age of the Universe, and, hence, could account for a non-negligible fraction of the dark matter.

show abstract

“…Various BSM scenarios that entail additional entropy injection to the neutrino sector can face a tough challange from the measurement of ∆N eff by both the present and future generation CMB experiments [79][80][81][82][83][84]. This precise measurement of ∆N eff has also non-trivial implications on various new physics models that produce dark matter in associated with the injection of additional light degrees of freedom [85][86][87][88]. Recently, studies with ∆N eff have JCAP07(2023)012 been explored in the context of resolving the discrepancy between local measurement and CMB estimation of the Hubble constant (H 0 ) [89,90].…”

Section: Introductionmentioning

confidence: 99%

CMB signature of non-thermal Dark Matter produced from self-interacting dark sector

Ghosh

Jeesun

2023

J. Cosmol. Astropart. Phys.

View full text Add to dashboard Cite

The basic idea of this work is to achieve the observed relic density of a non-thermal dark matter(DM) and its connection with Cosmic Microwave Background (CMB) via additional relativistic degrees of freedom which are simultaneously generated during the period T BBN to TCMB from a long-lived dark sector particle. To realize this phenomena we minimally extend the type-I seesaw scenario with a Dirac fermion singlet(χ) and a complex scalar singlet (φ) which transform non-trivially under an unbroken symmetry Z̶ 3. χ being the lightest particle in the dark sector acts as a stable dark matter candidate while the next to lightest state φ operates like a long lived dark scalar particle. The initial density of φ can be thermally produced through either self-interacting number changing processes (3φ ⟶ 2φ) within dark sector or the standard annihilation to SM particles (2φ ⟶ 2 SM). The late time (after neutrino decoupling) non-thermal decay of φ can produce dark matter in association with active neutrinos. The presence of extra relativistic neutrino degrees of freedom at the time of CMB can have a significant impact on ΔNeff. Thus the precise measurement of ΔNeff by current PLANCK 2018 collaboration and future experiments like SPT-3G and CMB-S4 can indirectly probe this non-thermal dark matter scenario which is otherwise completely secluded due to its tiny coupling with the standard model.

show abstract

Model independent analysis of MeV scale dark matter. II. Implications from e−e+ colliders and direct detection

Cited by 8 publications

References 54 publications

Light dark sectors through the Fermion portal

Light dark sectors through the Fermion portal

Neutrino and Z′ phenomenology in an anomaly-free U(1) extension: role of higher-dimensional operators

CMB signature of non-thermal Dark Matter produced from self-interacting dark sector

Contact Info

Product

Resources

About