Suchismita Sahoo

Scalar Leptoquarks and the Rare B Meson Decays

We study some rare decays of B meson involving the quark level transition \(b \rightarrow q l^+l^-~(q=d,s)\) in the scalar leptoquark model. We constrain the leptoquark parameter space using the recently measured branching ratios of \(B_{s,d} \rightarrow \mu ^+ \mu ^-\) processes. Using such parameters, we obtain the branching ratios, direct CP violation parameters and isospin asymmetries in \(B \rightarrow K \mu ^+ \mu ^-\) and \(B \rightarrow \pi \mu ^+ \mu ^-\) processes. We also obtain the branching ratios for some lepton flavour violating decays \(B \rightarrow l_i^+ l_j^-\). We find that the various anomalies associated with the isospin asymmetries of \(B \rightarrow K \mu ^+ \mu ^-\) process can be explained in the scalar leptoquark model.

Explaining the RK and RD(*) anomalies with vector leptoquarks

Recently, the B factories BABAR and Belle as well as the LHCb experiment have reported several anomalies in the semileptonic B meson decays, such as the R-K and R-D(*) etc. We investigate these deviations by considering the vector leptoquarks relevant for both b -> sl(+)l(-) and b -> cl(-)v(l) transitions. The leptoquark parameter space is constrained by using the experimentally measured branching ratios of B-s -> l(broken vertical bar) l(-), (B) over bar -> X(s)l(broken vertical bar) l(-) (v (v) over bar), and B-u(broken vertical bar) -> l(broken vertical bar) v(1) processes. Using the constrained leptoquark couplings, we compute the branching ratios, forward- backward asymmetries, tau, and D* polarization parameters in the (B) over bar -> D-(*) l (v) over bar (1)processes. We find that the vector leptoquarks can explain both the R-D(*) and R-K anomalies, simultaneously. Furthermore, we study the rare leptonic B-u,c(*) -> l (v) over bar decay processes in this model.

Lepton flavor violating B meson decays via a scalar leptoquark

We study the effect of scalar leptoquarks in the lepton flavor violating

Study of the rare semileptonic decays

B

B_d^0 \to K^* l^+ l^-

meson decays induced by the flavor-changing transitions

in scalar leptoquark model

b\ensuremath{\rightarrow}q{l}_{i}^{+}{l}_{j}^{\ensuremath{-}}

Effects of scalar leptoquark on semileptonic Λ b decays

with

Leptoquark effects on

q=s

b\;\to \;s{\boldsymbol{\nu }}\bar{{\boldsymbol{\nu }}}

,

and

d