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17 papers · 2 filters
Boosted top quarks in supersymmetric cascade decays at the LHC
Priyotosh Bandyopadhyay, Biplob Bhattacherjee
At the LHC, a generic supersymmetric cascade can be a source of top quark. Specifically third generation squarks and gluino are the major sources of top quark which could also be b…
Do new data on [B+ -> tau+ nu_tau] decays point to an early discovery of supersymmetry at the LHC?
Biplob Bhattacherjee, Amol Dighe, Diptimoy Ghosh +1
The recent Belle and BaBar measurements of the branching ratio of indicate a significant deviation from the Standard Model prediction. We demonstrate that this me…
Constraints on the Four-Generation Quark Mixing Matrix from a Fit to Flavor-Physics Data
Ashutosh Kumar Alok, Amol Dighe, David London
In the scenario with four quark generations, we perform a fit using flavor-physics data and determine the allowed values -- preferred central values and errors -- of all of the ele…
An upper bound on the total inelastic cross-section as a function of the total cross-section
Tai Tsun Wu, André Martin, Shasanka Mohan Roy +1
Recently André Martin has proved a rigorous upper bound on the inelastic cross-section at high energy which is one-fourth of the known Froissart-Martin-Lukaszuk upper bo…
Relic density and PAMELA events in a heavy wino dark matter model with Sommerfeld effect
Subhendra Mohanty, Soumya Rao, D. P. Roy
In a wino LSP scenario the annihilation cross section of winos gravitationally bound in galaxies can be boosted by a Sommerfeld enhancement factor which arises due to the ladder of…
2540 km: Bimagic baseline for neutrino oscillation parameters
Amol Dighe, Srubabati Goswami, Shamayita Ray
We show that a source-to-detector distance of 2540 km offers multiple advantages for a low energy neutrino factory with a detector that can identify muon charge. At this baseline,…
New Physics in b -> s mu+ mu-: CP-Conserving Observables
Ashutosh Kumar Alok, Alakabha Datta, Amol Dighe +3
We perform a comprehensive study of the impact of new-physics operators with different Lorentz structures on decays involving the b -> s mu+ mu- transition. We examine the effects…
eta_c production at the Large Hadron Collider
Sudhansu S. Biswal, K. Sridhar
We have studied the production of the 1S_0 charmonium state, eta_c, at the Large Hadron Collider (LHC) in the framework of Non-Relativistic Quantum Chromodynamics (NRQCD) using hea…
The interplay between the charged Higgs and squark-gluino events at the LHC
Nabanita Bhattacharyya, Amitava Datta, Monoranjan Guchait +2
In some extensions of the standard model with extended Higgs sectors, events from new particle production may pass the selection criteria for Higgs search in different channels at…
Boosted Top Quark Signals for Heavy Vector Boson Excitations in a Universal Extra Dimension Model
Biplob Bhattacherjee, Manoranjan Guchait, Sreerup Raychaudhuri +1
In view of the fact that the Kaluza-Klein (KK) modes in a model with a Universal Extra Dimension (UED), could mimic supersymmetry signatures at the LHC, it is necessary to…
Search for the minimal universal extra dimension model at the LHC with =7 TeV
Biplob Bhattacherjee, Kirtiman Ghosh
Universal Extra Dimension (UED) model is one of the popular extension of the Standard Model (SM) which offers interesting phenomenology. In the minimal UED (mUED) model, Kaluza-Kle…
Enhanced -- lifetime difference and anomalous like-sign dimuon charge asymmetry from new physics in
Amol Dighe, Anirban Kundu, Soumitra Nandi
New physics models that increase the decay rate of contribute to the absorptive part of -- mixing, and may enhance all the way up to its cu…
The QCD Phase Structure at High Baryon Density
P. Castorina, R. V. Gavai, H. Satz
We consider the possibility that color deconfinement and chiral symmetry restoration do not coincide in dense baryonic matter at low temperature. As a consequence, a state of massi…
Next-to-leading order QCD corrections to production at the LHC in Randall Sundrum model
Neelima Agarwal, V. Ravindran, Vivek Kumar Tiwari +1
We present next-to-leading order QCD corrections to production of two bosons at the LHC in the Randall-Sundrum model. Various kinematical distributions are obtained to order $α…
The SM and NLO multileg working group: Summary report
T. Binoth, G. Dissertori, J. Huston +88
This report summarizes the activities of the SM and NLO Multileg Working Group of the Workshop "Physics at TeV Colliders", Les Houches, France 8-26 June, 2009.
production in Large extra dimension model at next-to-leading order in QCD at the LHC
Neelima Agarwal, V. Ravindran, Vivek Kumar Tiwari +1
We present next-to-leading order QCD corrections to production of two bosons in hadronic collisions in the extra dimension ADD model. Various kinematical distributions are obta…
Comparing the Predictions of two Mixed Neutralino Dark Matter Models with the Recent CDMS II Candidate Events
D. P. Roy
We consider two optimally mixed neutralino dark matter models, based on nonuniversal gaugino masses, which were recently proposed by us to achieve WMAP compatible relic density ove…