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17 papers · 2 filters
Large extra dimensions and deep-inelastic scattering at HERA
Prakash Mathews, Sreerup Raychaudhuri, K. Sridhar
In scenarios motivated by string theories, it is possible to have extra Kaluza-Klein dimensions compactified to rather large magnitudes, leading to large effects of gravity at scal…
Double Asymptotic Scaling in Drell-Yan Processes
Rahul Basu, Sourendu Gupta
Double scaling may be observed in the Drell-Yan process at the Tevatron and in the ALICE detector at the Large Hadron Collider in a window of masses. In the double scaling limit of…
A See-Saw Model for Atmospheric and Solar Neutrino Oscillations
Ernest Ma, D. P. Roy, Utpal Sarkar
We have constructed an explicit see-saw model containing two singlet neutrinos, one carrying a gauge charge with an intermediate mass scale of GeV alon…
A Bound on Violations of Lorentz Invariance
R. Cowsik, B. V. Sreekantan
Recently Coleman and Glashow [1] have developed a model which allows the introduction of a small violation of Lorentz invariance. Observational signatures arise because this intera…
Getting to the top with extra dimensions
Prakash Mathews, Sreerup Raychaudhuri, K. Sridhar
The prospect of large extra dimensions and an effective theory of gravity at around a TeV has interesting experimental consequences. In these models, the Kaluza-Klein modes interac…
CP-violating Z-gamma-gamma and top-quark electric dipole couplings in gamma gamma -> t bar{t}
P. Poulose, Saurabh D. Rindani
An effective anomalous CP-violating Z-gamma-gamma coupling can give rise to observable CP-odd effects in gamma gamma -> t bar{t}. We study certain asymmetries in the decay lepton d…
Texture of a Four-Neutrino Mass Matrix
Subhendra Mohanty, D. P. Roy, Utpal Sarkar
We propose a simple texture of the neutrino mass matrix with one sterile neutrino along with the three standard ones. It gives maximal mixing angles for and $ν_μ\to ν…
Re-assessing the anomalous J/psi-suppression in the CERN NA50 data
Rajiv V. Gavai
A systematic analysis of the L-dependence of the J/psi-suppression in the data of the CERN NA38 and NA50 experiments shows that the anomalous suppression in the 1995 Pb-Pb data is…
Discovery potential for supersymmetry in CMS
S. Abdullin, Z. Antunovich, F. Charles +14
This work summarizes and puts in an overall perspective studies done within CMS concerning the discovery potential for squarks and gluinos, sleptons, charginos and neutralinos, SUS…
Radiative neutrino mass matrix for three active plus one sterile species
Naveen Gaur, Ambar Ghosal, Ernest Ma +1
A simple unifying mass matrix is presented for the three active and one sterile neutrinos , , and , using an extension of the radiative mechanism proposed some…
J/psi production at the Tevatron and HERA: the effect of k_T smearing
K. Sridhar, A. D. Martin, W. J. Stirling
We study the effects of intrinsic transverse momentum smearing on J/psi production both at the Tevatron and at HERA. For the case of large-p_T J/psi production at the Tevatron, the…
Light Charged Higgs Bosons in Supersymmetric Models
Manuel Drees, E. Ma, P. N. Pandita +2
We point out that present experimental limits from searches for neutral Higgs bosons at LEP already imply stringent lower bounds on the mass of the charged Higgs boson in the Minim…
Higgs and SUSY Searches at LHC
D. P. Roy
I start with a brief introduction to Higgs mechanism and supersymmetry. Then I discuss the theoretical expectations, current limits and search strategies for Higgs boson(s) at LHC…
eta_c Production at the Tevatron: A test of NRQCD
Prakash Mathews, P. Poulose, K. Sridhar
We use NRQCD to predict the cross section for production at the Tevatron. The non-perturbative matrix elements required are obtained, using heavy-quark symmetry, from the mat…
Pattern of Texture Zeroes in Quark Mass Matrices With a Divergent Top-Yukawa Coupling at the GUT Scale
Bipin R. Desai, D. P. Roy
In a SUSY GUT model responsible for generating symmetric quark mass matrices at the GUT scale (mu = Lamda) we assume that the top-Yukawa coupling, lamda_t, becomes infinite at that…
Quarkonium Polarization in Non-relativistic QCD and the Quark-Gluon Plasma
Sourendu Gupta
We examine angular distributions of leptons arising from the decay of J/psi in inclusive hadroproduction. Taking into account feed-down contributions from chi_{1,2}, a flat distrib…
Stringent New Bounds on Supersymmetric Higgs Bosons from Existing Tevatron Data
Manuel Drees, Monoranjan Guchait, Probir Roy
Limits are derived on models with extended Higgs sectors, including the Minimal Supersymmetric Standard Model (MSSM), by exploiting the data on 2 jets final states, us…