Pritibhajan Byakti

Burgeoning the Higgs mass to 125 GeV through messenger-matter interactions in GMSB models

A bstractA 125 GeV Higgs renders the simpler GMSB models unnatural, essentially pushing the soft spectrum beyond the LHC reach. A direct coupling of the matter and messenger fields, that facilitates an enhanced mixing in the squark sector, is a way to ameliorate this deficiency. We construct all possible messenger-matter interaction terms considering the messenger multiplets in 1, 5 and 10 dimensional representations of the SU(5). A Froggatt-Nielsen like flavor framework connected with the origin of fermion mass hierarchy is utilized to control the interaction terms and suppress FCNC. We perform a detailed comparative study of the efficiency of such interaction terms to boost the Higgs mass keeping the soft spectrum light. We identify the more promising models and comment on their status in present and future collider studies.

Magic Messengers in Gauge Mediation and signal for 125 GeV boosted Higgs boson

We consider a renormalizable messenger sector with magic messenger fields instead of usual SU(5) complete multiplets. We derive the soft supersymmetry breaking terms and show that the gaugino sector can be parameterized by only two parameters. These parameters can be chosen appropriately to obtain various patterns of gaugino masses and different ratios among them. The sfermion sector can also be characterized by two independent parameters which can be adjusted to change the relative masses of squarks and sleptons. A judicious choice of parameters also allows us to achieve the lightest Higgs boson mass about 125 GeV. In this paper we focus on a scenario where a comparatively large hierarchy exists between the U(1) and SU(2) gaugino mass parameters. In such a case, the lightest Higgs boson originating from the decay of the next-to-lightest neutralino, following the direct production of chargino neutralino pair, can be considerably boosted. We show that a boosted Supersymmetric Higgs signal with a decent signal to background ratio can be obtained using the jet substructure technique at LHC with 8 TeV (14 TeV) center of mass energy and an integrated luminosity of about 30 fb

Role of tensor operators in RK and RK

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A closer look at the

(15 fb

R_D

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and

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R_{D^*}

Abstract The recent LHCb measurement of R K ⁎ in two q 2 bins, when combined with the earlier measurement of R K , strongly suggests lepton flavour non-universal new physics in semi-leptonic B meson decays. Motivated by these intriguing hints of new physics, several authors have considered vector, axial vector, scalar and pseudo scalar operators as possible explanations of these measurements. However, tensor operators have widely been neglected in this context. In this paper, we consider the effect of tensor operators in R K and R K ⁎ . We find that, unlike other local operators, tensor operators can comfortably produce both of R K ⁎ low and R K ⁎ central close to their experimental central values. However, a simultaneous explanation of R K is not possible with only Tensor operators, and other vector or axial vector operators are needed. In fact, we find that combination of vector and tensor operators can provide simultaneous explanations of all the anomalies comfortably at the 1σ level, a scenario which is hard to achieve with only vector or axial vector operators. We also comment on the compatibility of the various new physics solutions with the measurements of the inclusive decay B d → X s l + l − .

anomalies

A bstractThe measurement of RD (RD*), the ratio of the branching fraction of B¯→Dτν¯τB¯→D∗τν¯τ

Alternative search strategies for a BSM resonance fitting the ATLAS diboson excess

\overline{B}\to D\tau {\overline{\nu}}_{\tau}\left(\overline{B}\to {D}^{\ast}\tau {\overline{\nu}}_{\tau}\right)