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S. R. Choudhury

Publications and source records attributed to S. R. Choudhury.

14 recordsLinked to original sources
arXiv2011

Analysis of the lepton polarisation asymmetries of ${\bar B} \to {\bar K}_2(1430) \, \ell^+ \, \ell^-$ decay

In this work we will study the longitudinal polarisations of both leptons in the decay process ${\bar B} \to {\bar K}_2(1430)\, \ell^+ \, \ell^-$. This process has all the features of the related and well investigated process ${\bar B} \to {\bar K}^*(890) \, \ell^+ \, \ell^-$, with theoretically comparable branching ratios. The polarised differential decay rates as well as the single and double polarisation asymmetries are worked out, where the sensitivity of these to possible right-handed couplings for the related $b \to s$ radiative decay (and other generic BSM parameters) are also investigated.

hep-ph↗
arXiv2004

CP violation in the decay mode $B\to πγγ$

Within the framework of Standard Model, the exclusive decay mode $B\to πγγ$ is studied. Although the usual short distance contribution is small compared to the similar $B\to Kγγ$ mode, the process offers the possibility of studying the CP violation, a feature absent in the $B \to K$ counterpart.

hep-ph↗
arXiv2004

Supersymmetric effects on Forward Backward asymmetries of $B \to K \ell^+ \ell^-$

Leptonic and semi-leptonic rare decays of B-mesons are very clean (both theoretically and experimentally) signatures of any new physics beyond the Standard Model (SM). More specifically the decay \btokll has been theoretically observed to be very sensitive to new physics as the Forward Backward (FB) asymmetry in this decay mode vanishes in the SM. Supersymmetry, however, predicts a non-vanishing value of this asymmetry. In this work we will study the polarized lepton pair FB asymmetry, i.e. the FB asymmetry of the lepton when one (or both) final state lepton(s) are polarized. We will study these asymmetries both within the SM and for Supersymmetric corrections to the SM.

hep-ph↗
arXiv2002

Probing large distance higher dimensional gravity from lensing data

The modifications induced in the standard weak-lensing formula if Newtonian gravity differs from inverse square law at large distances are studied. The possibility of putting bounds on the mass of gravitons from lensing data is explored. A bound on graviton mass, esitmated to be about 100 Mpc$^{-1}$ is obtained from analysis of some recent data on gravitational lensing.

hep-ph↗
arXiv2002

Weak Scale Quantum Gravity Effects for $γγ\to ZZ$ in the TeV region

We consider the effect of massive spin-2 gravitons that occur as Kaluza-Klein excitations of the graviton in a Weak scale Quantum Gravity scenario on the process $γγ\to ZZ$, which in the Standard Model can proceed through loop diagrams. For a wide range of parameters, we show that the massive gravitons leave behind signatures that should be verifiable in a TeV scale scattering experiment.

hep-ph↗
arXiv2001

TeV-scale electron Compton scattering in the Randall-Sundrum scenario

The spin-2 graviton excitations in the Randall-Sundrum gravity model provides a t-channel contribution to electron Compton scattering which competes favourably with the standard QED contributions. The phenomenological implications of these contributions to the unpolarized and polarized cross-sections are evaluated.

hep-ph↗
arXiv2000

Radion signature in $γγ$ scattering

We investigate the phenomenological consequences of the possible existence of the radion at a TeV-scale for $γγ$ scattering in the TeV range. We find that polarized cross-sections only give possible experimental signatures for the radion.

hep-ph↗
arXiv1995

Triviality Bound on Lightest Higgs Mass in NMSSM

We study the implication of triviality on Higgs sector in next to minimal supersymmetric model (NMSSM) using variational field theory. It is shown that mass of the lightest Higgs boson in NMSSM has an upper bound $\sim 10\, M_W$ which is of the same order as that in standard model.

hep-ph↗