AseshKrishna Datta

Contrasting Supersymmetry and Universal Extra Dimensions at the CLIC Multi-TeV e+e- Collider

Universal extra dimensions and supersymmetry have rather similar experimental signatures at hadron colliders. The proper interpretation of an LHC discovery in either case may therefore require further data from a lepton collider. In this paper we identify methods for discriminating between the two scenarios at the linear collider. We study the processes of Kaluza-Klein muon pair production in universal extra dimensions in parallel to smuon pair production in supersymmetry, accounting for the effects of detector resolution, beam-beam interactions and accelerator induced backgrounds. We find that the angular distributions of the final state muons, the energy spectrum of the radiative return photon and the total cross-section measurement are powerful discriminators between the two models. Accurate determination of the particle masses can be obtained both by a study of the momentum spectrum of the final state leptons and by a scan of the particle pair production thresholds. We also calculate the production rates of various Kaluza-Klein particles and discuss the associated signatures.

Correlated hierarchy, Dirac masses and large mixing angles

We introduce a new parametrization of the MNS lepton mixing matrix which separates the hierarchical grand unified relations among quarks and leptons. We argue that one large angle stems from the charged leptons, the other from the seesaw structure of the neutral lepton mass matrix. We show how two large mixing angles can arise naturally provided there are special requirements on the Dirac (ΔIw=1/2) and Majorana (ΔIw=0) masses. One possibility is a correlated hierarchy between them, the other is that the ΔIw=0 Majorana mass has a specific texture; it is Dirac-like for two of the three families.

Cabibbo haze in lepton mixing

Abstract Quark–lepton unification suggests Cabibbo-sized effects in lepton mixings, which we call Cabibbo haze. We give simple examples and explore possible Wolfenstein-like parametrizations of the MNSP matrix which incorporate leptonic Cabibbo shifts. We find that the size of the CHOOZ angle is not always correlated with the observability of CP violation.

Non-universal gaugino masses: a signal-based analysis for the Large Hadron Collider

We discuss the signals at the Large Hadron Collider (LHC) for scenarios with non-universal gaugino masses in supersymmetric (SUSY) theories. We perform a multichannel analysis, and consider the ratios of event rates in different channels such as

Minimal universal extra dimensions in CalcHEP/CompHEP

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Detection of mssm higgs bosons from supersymmetric particle cascade decays at the LHC

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Non-minimal Universal Extra Dimensions: The strongly interacting sector at the Large Hadron Collider

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Search for Higgs bosons of the universal extra dimensions at the large Hadron collider

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Non-minimal Universal Extra Dimensions with Brane Local Terms: The Top Quark Sector

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Signatures of gaugino mass non-universality in cascade Higgs production at the LHC

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