Siba Prasad Das

Four-body decay of the stop squark at the upgraded Tevatron

We investigate the prospect of a top squark search at the Fermilab Tevatron run-II in MSUGRA motivated as well as unconstrained supersymmetric models, when the lighter top squark turns out to be the next lightest supersymmetric particle (NLSP). In this case, the decay into a four body final state consisting of a b quark, the lightest neutralino, and two light fermions may compete with the much publicized loop-induced two body decay into a charm quark and the lightest neutralino. We systematically study the parameter space in MSUGRA where the lighter top squark turns out to be the NLSP and calculate the branching ratios of the competing channels in both models. Our results show that the four body decay may indeed be the main discovery channel particularly in the low

Working group report: High energy and collider physics

\mathrm{tan}\ensuremath{\beta}

Light neutral CP-even Higgs boson within the next-to-minimal supersymmetric standard model at the Large Hadron Electron Collider

scenarios. We discuss the detectability of top squark pairs in the four body decay channel leading to one lepton

Summary of the Activities of the Working Group I on High Energy and Collider Physics

(e

Testing SUSY models for the muon g-2 anomaly via chargino-neutralino pair production at the LHC

or

Multilepton signatures of the Higgs boson through its production in association with a top-quark pair

\ensuremath{\mu})

Top squark mass: current limits revisited and new limits from Tevatron Run-I

with two or more jets, accompanied by a large amount of missing energy. We also study the corresponding background processes and the kinematic cuts required to suppress them using parton level Monte Carlo simulations. We comment upon, with illustrative examples, the required revision of the existing mass limits of the top squark NLSP assumed to decay solely into the loop-induced two body channel.

Dilepton Signatures of the Higgs Boson with Tau-jet Tagging

This is a summary of the projects undertaken by the Working Group I on High Energy Collider Physics at the Eighth Workshop on High Energy Physics Phenomenology (WHEPP8) held at the Indian Institute of Technology, Mumbai, January 5-16, 2004. The topics covered are (i) Higgs searches (ii) supersymmetry searches (iii) extra dimensions and (iv) linear collider.This is a summary of the projects undertaken by the working group I on high energy and collider physics.

Production of a light top-squark pair in association with a light non-standard Higgs boson within the NMSSM at the 13 TeV LHC and a 33 TeV proton collider

We analyze the prospects of observing the light CP-even neutral Higgs bosons (

Working group report: Collider Physics

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