Chandradew Sharma

Radiative Neutralino Production in Low Energy Supersymmetric Models

We study the production of the lightest neutralinos in the radiative process e{sup +}e{sup -}{yields}{chi}-tilde{sub 1}{sup 0}{chi}-tilde{sub 1}{sup 0}{gamma} in low energy supersymmetric models for the International Linear Collider energies. This includes the minimal supersymmetric standard model as well as its extension with an additional chiral Higgs singlet superfield, the nonminimal supersymmetric standard model. We compare and contrast the dependence of the signal cross section on the parameters of the neutralino sector of the minimal and nonminimal supersymmetric standard model. We also consider the background to this process coming from the standard model process e{sup +}e{sup -}{yields}{nu}{nu}{gamma}, as well as from the radiative production of the scalar partners of the neutrinos (sneutrinos) e{sup +}e{sup -}{yields}{nu}-tilde{nu}-tilde*{gamma}, which can be a background to the radiative neutralino production when the sneutrinos decay invisibly. In low energy supersymmetric models radiative production of the lightest neutralinos may be the only channel to study supersymmetric partners of the standard model particles at the first stage of a linear collider, since heavier neutralinos, charginos, and sleptons may be too heavy to be pair produced at a e{sup +}e{sup -} machine with {radical}(s)=500 GeV.

Patterns of new physics in B decays

Abstract We show that any new physics (NP) which affects B decays with penguin contributions can be absorbed by redefinitions of the Standard Model (SM) diagrammatic amplitudes. Hence, there are no signals of NP in such decays unless there is an accurate theoretical estimate of hadronic parameters or a justifiable approximation can be made. In all decays with penguin contributions, NP simultaneously affects pairs of diagrams. The evidence for a large C ′ from fits to B → π K data is naturally explained if NP contributes to P EW ′ , since NP affects the P EW ′ and C ′ diagrams as a pair. The weak phase γ measured in B → π K decays will always agree with its SM value even in the presence of NP, if the NP contributes in such a way that the amplitudes retain the SM form after suitable redefinitions.

Angular analysis of B decaying into J/{psi} tensor, J/{psi} vector and J/{psi} scalar modes

The analysis of

Angular analysis of B decaying into J/psi Tensor, J/psi Vector and J/psi Scalar

B \to \jpsi K^{\star}_{2}(1430)

A Study of Correlations in the Stock Market

decay mode is complicated by the fact that close to the

Radiative neutralino production in low energy supersymmetric Models. II. The Case of beam polarization

J^{PC}=2^{++}

Determination of weak amplitudes using Bose symmetry and Dalitz plots.

meson

Plunges in the Bombay stock exchange: Characteristics and indicators

\Kstart(1430)

GENERALIZED ANALYSIS ON B → K*ρ WITHIN AND BEYOND THE STANDARD MODEL

, there lie other

Generalized analysis on B ---> K* rho within and beyond the Standard Model: Can it help understand the B ---> K pi puzzle?

J^{PC}=1^{--}