arXiv subjects

Sumit K. Garg

Publications and source records attributed to Sumit K. Garg.

21 records · Page 2Linked to original sources

arXiv2011

Bounds on fourth generation induced Lepton Flavour Violating double insertions in Supersymmetry

We derive bounds on leptonic double mass insertions of the type $δ^{l}_{i4} δ^{l}_{4j}$ in four generational MSSM, using the present limits on $l_i \to l_j + γ$. Two main features distinguish the rates of these processes in MSSM4 from MSSM3 : (a) tan$β$ is restricted to be very small $\lesssim 3 $ and (b) the large masses for the fourth generation leptons. In spite of small $\tanβ$, there is an enhancement in amplitudes with $llrr$($δ_{i4}^{ll}δ_{4j}^{rr}$) type insertions which pick up the mass of the fourth generation lepton, $m_{τ'}$. We find these bounds to be at least two orders of magnitude more stringent than those in MSSM3.

hep-ph↗

arXiv2011

The New Minimal Supersymmetric GUT : Spectra, RG analysis and fitting formulae

The Supersymmetric SO(10) GUT based on the ${\bf{210\oplus 10\oplus 120\oplus 126\oplus {\bar{126}}}}$ Higgs system has 40 real superpotential parameters of which 2 can be fixed by the Light Higgs doublet fine tuning and one by the determination of the unification scale by the RG flow. It provides a minimal framework for the emergence of R-parity exact Supersymmetric Standard Model at low energies and viable supersymmetric seesaw explanation for the observed neutrino masses and mixing angles. We present complete formulae for MSSM decomposition of the superpotential invariants, explicit GUT scale one step spontaneous symmetry breaking down to the MSSM, tree level light charged fermion effective yukawa couplings, Weinberg neutrino mass generation operator, and the complete set of effectve superpotential coefficients of LLLL and RRRR $d=5$ Baryon violating operators(which have contributions from novel \textbf{120}-plet Higgs channels) in terms of GUT superpotential parameters. We survey the gauge RG flow including threshold corrections due to the calculated super heavy particle spectra. The formulae given are used in following papers to determine complete realistic Susy SO(10) GUT fits of all MSSM data.

hep-ph↗

arXiv2011

TeV Scale Implications of Non Commutative Space time in Laboratory Frame with Polarized Beams

We analyze $e^{+}e^{-}\rightarrow γγ$, $e^{-}γ\rightarrow e^{-}γ$ and $γγ\rightarrow e^{+}e^{-} $ processes within the Seiberg-Witten expanded noncommutative scenario using polarized beams. With unpolarized beams the leading order effects of non commutativity starts from second order in non commutative(NC) parameter i.e. $O(Θ^2)$, while with polarized beams these corrections appear at first order ($O(Θ)$) in cross section. The corrections in Compton case can probe the magnetic component($\vecΘ_B$) while in Pair production and Pair annihilation probe the electric component($\vecΘ_E$) of NC parameter. We include the effects of earth rotation in our analysis. This study is done by investigating the effects of non commutativity on different time averaged cross section observables. The results which also depends on the position of the collider, can provide clear and distinct signatures of the model testable at the International Linear Collider(ILC).

hep-ph↗