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- David Atwood, Michael Gronau, Amarjit Soni
- 1997

In the Standard Model (SM) the photon in radiative ¯ B 0 and ¯ B s decays is predominantly left-handed. Thus, mixing induced CP asymmetries in b → sγ and b → dγ are suppressed by m s /m b and m d /m b , respectively, and are very small. In many extensions of the SM, such as the left-right symmetric model (LRSM), SU(2) × U(1) models with exotic fermions and… (More)

- Jack Laiho, Amarjit Soni
- 2003

We show that it is possible to construct ǫ ′ /ǫ to NLO using partially quenched chiral perturbation theory (PQChPT) from amplitudes that are computable on the lattice. We demonstrate that none of the needed amplitudes require three-momentum on the lattice for either the full theory or the partially quenched theory; non-degenerate quark masses suffice.… (More)

We present a pedagogical introduction to supersymmetry and supersym-metric models and give an overview of the potential of the linear collider for studying them. If supersymmetry is found, its discovery will bring with it many more questions than answers. These include: Are the newly discovered particles really superpartners? If not all superpartners are… (More)

We report on our calculation of K → π vector form factor by numerical simulations of two-flavor QCD on a 16 3 × 32 × 12 lattice at a 0.12 fm using domain-wall quarks and DBW2 glue. Our preliminary result at a single sea quark mass correponding to m PS /m V 0.53 shows a good agreement with previous estimate in quenched QCD and that from a phenomenological… (More)

We recently showed, in hep-ph/0406101, that warped extra dimensional models with bulk custodial symmetry and few TeV KK masses lead to striking signals at B-factories. In this paper, using a spurion analysis , we systematically study the flavor structure of models that belong to the above class. In particular we find that the profiles of the zero modes,… (More)

- David Atwood, Amarjit Soni
- 1999

We consider the production of gravitons via two photon and electron-photon fusion in Kaluza-Klein theories which allow TeV scale gravitational interactions. We show that at electron-positron colliders, the processes ℓ + ℓ − → ℓ + ℓ − + graviton, with ℓ = e, µ, can lead to a new signal of low energy gravity of the form ℓ + ℓ − → ℓ + ℓ − + missing energy… (More)

We consider several hints for new physics involving CP-asymmetries in B-decays and interpret them in terms of generic contributions to effective Wilson coefficients. The effects we focus on are: the differences in the fitted value of sin 2β versus the ones directly measured via the time dependent CP asymmetries in B → J/ψK or via B → (φ, η ′)K; the… (More)

- Gilad Perez, Kaustubh Agashe, +5 authors Zoltan Ligeti
- 2006

- Amarjit Soni
- 1997

We consider the strong rescattering effects that can occur in the decays such as B → Kπ, K * π, Kρ. .. and their impact on direct CP violation in these modes. First we discuss, in general, how the CPT theorem constrains the resulting pattern of partial rate asymmetries leading to different brands of direct CP. Traditional discussions have centered around… (More)

The potential of a Super Flavor Factory (SFF) for searches of New Physics is reviewed. While very high luminosity B physics is assumed to be at the core of the program, its scope for extensive charm and τ studies are also emphasized. The possibility to run at the Υ(5S) as well as at the Υ(4S) is also very briefly discussed; in principle, this could provide… (More)