PPC 2024: XVII International Conference on Interconnections between Particle Physics and Cosmology

Connecting the b→sℓℓ decays with dark sector in the light of scalar leptoquark R~2

15 Oct 2024, 17:00

15m

Seminar Room 1, Convention Center (IIT Hyderabad)

Parallel talk Parallel - Flavour

Speaker

Dhiren Panda (UNIVERSITY OF HYDERABAD)

Description

We make a correlative study of B-meson anomalies and fermionic dark matter in an extended standard model framework with $U(1{)}_{L_e-L_{\mu }}$ gauge symmetry. With three heavy neutral fermions and scalar double leptoquark ${\tilde{R}}_2$, we realize the $b\to s$ transition. On top, an additional singlet spontaneously breaks the new $U(1)$ and an inert scalar doublet to obtain neutrino mass at one loop. We then focus on the dark matter relic density and direct detection cross-section in scalar and gauge portals. The new physics contribution for $b\to s$ transition comes from penguin diagrams with $Z^{\prime }$, leptquark, and new fermions. We then constrain the model parameter space from the dark sector and also the well-established observables such as Br($B_s\to \varphi ,K^{(\ast )})\mu \mu$ and $P_5^{\prime }$ processes. Utilizing the allowed parameter space consistent with both sectors, we discuss the impact on several observables such as branching ratio, forward-backward asymmetry, and polarisation asymmetry. We also explore the lepton non-universality of ${\mathrm{\Lambda }}_b\to {\mathrm{\Lambda }}^{\ast }(1520)(\to pK)\ell \ell$ process.

Presentation materials

DHIREN_PPC_2024.pdf