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18 papers · 2 filters
Neutrinos from a core collapse supernova
Amol Dighe
The neutrino burst from a galactic supernova can help determine the neutrino mass hierarchy and , and provide crucial information about supernova astrophysics. Here we revi…
Collective three-flavor oscillations of supernova neutrinos
Basudeb Dasgupta, Amol Dighe
Neutrinos and antineutrinos emitted from a core collapse supernova interact among themselves, giving rise to collective flavor conversion effects that are significant near the neut…
Probing a Supersymmetric Model for Neutrino Masses at Ultrahigh Energy Neutrino Telescopes
M. Hirsch, D. P. Roy, J. W. F. Valle
A bilinear R-Parity breaking SUSY model for neutrino mass and mixing predicts the lightest superparticle to decay mainly into a pair of tau leptons or b quarks along with a neutrin…
Four Zero Neutrino Yukawa Textures in the Minimal Seesaw Framework
Gustavo C. Branco, David Emmanuel-Costa, M. N. Rebelo +1
We investigate, within the Type I seesaw framework, the physical implications of zero textures in the Yukawa couplings which generate the neutrino Dirac mass matrix . It is sh…
Associated production of a Kaluza-Klein excitation of a gluon with a t t(bar) pair at the LHC
M. Guchait, F. Mahmoudi, K. Sridhar
In Randall-Sundrum models, the Kaluza-Klein (KK) excitations of the gluon, g_{KK} have enhanced couplings to the right-handed quarks. In the absence of a gg g_{KK} coupling in thes…
Physics at a future Neutrino Factory and super-beam facility
The ISS Physics Working Group
The conclusions of the Physics Working Group of the international scoping study of a future Neutrino Factory and super-beam facility (the ISS) are presented. The ISS was carried by…
Tree FCNC and non-unitarity of CKM matrix
C. S. Kim, Amol Dighe
We discuss possible signatures of the tree level FCNC, which results from the non-unitarity of CKM matrix. We first define the unitaity step-by-step, and possible test of the non-u…
Signatures of heavy sterile neutrinos at long baseline experiments
Amol Dighe, Shamayita Ray
Sterile neutrinos with masses eV or higher would play an important role in astrophysics and cosmology. We explore possible signatures of such sterile neutrinos at long b…
Focus Point SUSY at the LHC Revisited
Siba Prasad Das, Amitava Datta, Monoranjan Guchait +2
The estimation of the backgrounds for gluino signals in focus point supersymmetry is extended by including the backgrounds from the production of four third generation quarks in th…
Neutrino symmetries from high to low scales
Probir Roy
Proposed symmetry relations, e.g., quark-lepton complementarity (QLC) or tribimaximal mixing (TBM), need to be imposed at a high scale GeV characterising the…
Puzzles of excited charm meson masses
B. Ananthanarayan, Sunanda Banerjee, K. Shivaraj +1
We attempt a comprehensive analysis of the low lying charm meson states which present several puzzles, including the poor determination of masses of several non-strange excited mes…
Possibility of large lifetime differences in neutral B meson systems
Amol Dighe, Anirban Kundu, Soumitra Nandi
We investigate new physics models that can increase the lifetime differences in the -- systems () above their standard model values. If both as well…
Natural Dark Matter in SUSY GUTs with Non-universal Gaugino Masses
S. F. King, J. P. Roberts, D. P. Roy
We consider neutralino dark matter within the framework of SUSY GUTs with non-universal gaugino masses. In particular we focus on the case of SU(5) with a SUSY breaking F-term in t…
Z boson decay to photon plus Kaluza-Klein graviton in large extra dimensions
Ben C. Allanach, Jordan P. Skittrall, K. Sridhar
In the large extra dimensional ADD scenario, Z bosons undergo a one-loop decay into a photon and Kaluza-Klein towers of gravitons/gravi-scalars. We calculate such a decay width, ex…
Top production at the Tevatron/LHC and nonstandard, strongly interacting spin one particles
Debajyoti Choudhury, Rohini M. Godbole, Ritesh K. Singh +1
In this note, we consider possible constraints from production on the gauge bosons of theories with an extended strong interaction sector such as axigluons or flavour un…
Radiatively broken symmetries of nonhierarchical neutrinos
Amol Dighe, Srubabati Goswami, Probir Roy
Symmetry-based ideas, such as the quark-lepton complementarity (QLC) principle and the tri-bimaximal mixing (TBM) scheme, have been proposed to explain the observed mixing pattern…
Tevatron constraint on the Kaluza-Klein gluon of the Bulk Randall-Sundrum model
M. Guchait, F. Mahmoudi, K. Sridhar
The Bulk Randall-Sundrum model, where all Standard Model particles except the Higgs are free to propagate in the bulk, predicts the existence of Kaluza-Klein (KK) modes of the gluo…
Physics Beyond the Standard Model and Cosmological Connections: A Summary from LCWS 06
K. Sridhar
The International Linear Collider (ILC) is likely to provide us important insights into the sector of physics that may supersede our current paradigm viz., the Standard Model. In a…