Bulk Higgs field in a Randall-Sundrum model with nonvanishing brane cosmological constant (2009)
Dey, Paramita, Mukhopadhyaya, Biswarup, SenGupta, Soumitra
We consider the possibility of Higgs mechanism in the bulk in a generalised Randall-Sundrum model, where a nonvanishing cosmological constant is induced on the visible brane. This scenario has the...
Chargino reconstruction in supersymmetry with long-lived staus (2009)
Biswas, Sanjoy, Mukhopadhyaya, Biswarup
We consider a supersymmetric (SUSY) scenario including right-handed neutrinos, one of whose scalar superpartners is the lightest SUSY particle (LSP). The distinguishing feature in the collider signal...
Bhattacharya, Subhaditya, Chattopadhyay, Utpal, Choudhury, Debajyoti, Das, Debottam, Mukhopadhyaya, Biswarup
We perform a multilepton channel analysis in the context of the Large Hadron Collider (LHC) for WMAP compatible points in a model with non-universal scalar masses, which admits a Higgs funnel region...
Unitarity violation in sequential neutrino mixing in a model of extra dimensions (2009)
Bhattacharya, Subhaditya, Dey, Paramita, Mukhopadhyaya, Biswarup
We investigate the possibility of unitarity violation in the sequential neutrino mixing matrix in a scenario with extra compact spacelike dimensions. Gauge singlet neutrinos are assumed to propagate...
Dey, Paramita, Mukhopadhyaya, Biswarup, SenGupta, Soumitra
The Randall-Sundrum model of warped geometry in a five-dimensional scenario, aimed at explaining the hierarchy between the Planck and electroweak scales, is intrinsically unstable in its minimal form...
A Randall-Sundrum scenario with bulk dilaton and torsion (2009)
Mukhopadhyaya, Biswarup, Sen, Somasri, SenGupta, Soumitra
We consider a string-inspired torsion-dilaton-gravity action in a Randall-Sundrum brane world scenario and show that, in an effective four-dimensional theory on the visible brane, the rank-2...
Neutralino reconstruction in supersymmetry with long-lived staus (2009)
Biswas, Sanjoy, Mukhopadhyaya, Biswarup
We consider a supergravity (SUGRA) scenario, with universal scalar and gaugino masses at high scale, with a right-chiral neutrino superfield included in the spectrum. Such a scenario can have a...
Signals of supersymmetry with inaccessible first two families at the Large Hadron Collider (2009)
Desai, Nishita, Mukhopadhyaya, Biswarup
We investigate the signals of supersymmetry (SUSY) in a scenario where only the third family squarks and sleptons can be produced at the Large Hadron Collider (LHC), in addition to the gluino,...
Dey, Paramita, Gupta, Sudhir Kumar, Mukhopadhyaya, Biswarup
We consider the Littlest Higgs Model with T-parity (LHT), in the parameter region where a heavy neutrino is the lightest T-odd particle (LTP). Having emphasized that this corresponds to a sizable...
Bhattacharya, Subhaditya, Datta, AseshKrishna, Mukhopadhyaya, Biswarup
We investigate the parameter space of the minimal supersymmetric Standard Model (MSSM) where the gluino and squark masses are much above 1 TeV but the remaining part of the sparticle spectrum is...
Two-loop neutrino masses with large R-parity violating interactions in supersymmetry (2008)
Dey, Paramita, Kundu, Anirban, Mukhopadhyaya, Biswarup, Nandi, Soumitra
We attempt to reconcile large trilinear R-parity violating interactions in a supersymmetric (SUSY) theory with the observed pattern of neutrino masses and mixing. We show that, with a restricted...
Signatures of gaugino mass non-universality in cascade Higgs production at the LHC (2008)
Bandyopadhyay, Priyotosh, Datta, AseshKrishna, Mukhopadhyaya, Biswarup
Supersymmetric cascades, involving charginos and neutralinos at various stages, contribute in a significant way to Higgs production at the LHC. We explore the nature of such cascades, completely...
Non-universal scalar masses: a signal-based analysis for the Large Hadron Collider (2008)
Bhattacharya, Subhaditya, Datta, AseshKrishna, Mukhopadhyaya, Biswarup
We study the possible signatures of non-universal scalar masses in supersymmetry at the Large Hadron Collider (LHC). This is done, following our recent study on gaugino non-universality, via a...
Right sneutrinos and the signals of a stable stop at the Large Hadron Collider (2008)
Choudhury, Debajyoti, Gupta, Sudhir Kumar, Mukhopadhyaya, Biswarup
We investigate charged tracks signals of a supersymmetric scenario, where the lighter stop is the next-to-lightest supersymmetric particle (NLSP). It is found that such an NLSP is stable on the scale...
Gabriel, S., Mukhopadhyaya, Biswarup, Nandi, S., Rai, Santosh Kumar
We explore the signals of a charged Higgs arising in a two Higgs doublet model respecting SU(2)_L times U(1) times Z_2 symmetry with three singlet right handed neutrinos, N_R. The charged Higgs in...
Some consequences of a Higgs triplet (2008)
Dey, Paramita, Kundu, Anirban, Mukhopadhyaya, Biswarup
We consider an extension of the scalar sector of the Standard Model with a single complex Higgs triplet $X$. Such extensions are the most economic, model-independent way of generating neutrino masses...
Bandyopadhyay, Priyotosh, Datta, Amitava, Datta, AseshKrishna, Mukhopadhyaya, Biswarup
A benchmark CP-violating supersymmetric scenario (known in the literature as `CPX-scenario') is studied in the context of the Large Hadron Collider (LHC). It is shown that the LHC, with low to...
Right-Chiral Sneutrino LSP in mSUGRA: Event characteristics of NLSP at the LHC (2007)
Gupta, Sudhir Kumar, Mukhopadhyaya, Biswarup, Rai, Santosh Kumar
We study a supersymmetric scenario where the lighter tau-sneutrino is the lightest supersymmetric particle, while the lighter stau-state is the next lightest. Such a scenario can be motivated within...
Bulk antisymmetric tensor fields in a Randall-Sundrum model (2007)
Mukhopadhyaya, Biswarup, Sen, Somasri, SenGupta, Soumitra
We consider bulk antisymmetric tensor fields of various ranks in a Randall-Sundrum scenario. We show that, rank-2 onwards, the zero-modes of the projections of these fields on the (3+1) dimensional...
Non-universal gaugino masses: a signal-based analysis for the Large Hadron Collider (2007)
Bhattacharya, Subhaditya, Datta, AseshKrishna, Mukhopadhyaya, Biswarup
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...
Datta, AseshKrishna, Dey, Paramita, Gupta, Sudhir Kumar, Mukhopadhyaya, Biswarup, Nyffeler, Andreas
We analyse hadronically quiet trilepton signatures in the T-parity conserving Littlest Higgs model and in R-parity conserving supersymmetry at the Large Hadron Collider. We identify the regions of...
Invisibly decaying Higgs boson in the Littlest Higgs model with T-parity (2007)
Hundi, Raghavendra Srikanth, Mukhopadhyaya, Biswarup, Nyffeler, Andreas
We show that there are regions in the parameter space of the Littlest Higgs model with T-parity, allowed by electroweak precision data, where the Higgs boson can decay invisibly into a pair of heavy...
Pair Production of Doubly-Charged Scalars: Neutrino Mass Constraints and Signals at the LHC (2007)
Han, Tao, Mukhopadhyaya, Biswarup, Si, Zongguo, Wang, Kai
We study the pair production of doubly charged Higgs bosons at the Large Hadron Collider (LHC), assuming the doubly charged Higgs to be part of an SU(2)_L triplet which generates Majorana masses for...
Adhikari, Rathin, Datta, Anindya, Mukhopadhyaya, Biswarup
Considering a general mass matrix for quasi-degenerate neutrinos and treating the experimentally known oscillation parameters as inputs, we study the correlation between the degenerate mass scale...
Gupta, Sudhir Kumar, Mukhopadhyaya, Biswarup, Rai, Santosh Kumar
We investigate the signals of a supersymmetric scenario where the lighter tau-sneutrino is the lightest supersymmetric particle, while the lighter stau-state is the next lightest. We confirm that...
Invisible Higgs boson decay in the littlest Higgs model with T-parity (2006)
Hundi, Raghavendra Srikanth, Mukhopadhyaya, Biswarup, Nyffeler, Andreas
We study the invisible decay of the Higgs boson into a pair of stable, heavy photons, H -> A_H A_H, in the littlest Higgs model with T-parity. For a symmetry breaking scale of f = 450 GeV, the...
Supergravity can reconcile dark matter with lepton number violating neutrino masses (2006)
Mukhopadhyaya, Biswarup, SenGupta, Soumitra, Srikanth, Raghavendra
Supersymmetry offers a cold dark matter candidate, provided that lepton number is {\em not violated by an odd number of units}. On the other hand, lepton number violation by even (two) units gives us...
Associated single photons and doubly charged scalar at linear e-e- colliders (2006)
Mukhopadhyaya, Biswarup, Rai, Santosh Kumar
Doubly charged scalars, predicted in many models having exotic Higgs representations, can in general have lepton-number violating (LFV) couplings. We show that by using an associated monoenergetic...
Mukhopadhyaya, Biswarup, Srikanth, Raghavendra
We consider the possibility of neutrino mass generation in a supersymmetric model where lepton number can be violated by odd units. The different patterns of mixing in the quark and lepton sectors...
Distinguishing split supersymmetry in Higgs signals at the Large Hadron Collider (2005)
Gupta, Sudhir Kumar, Mukhopadhyaya, Biswarup, Rai, Santosh Kumar
We examine the possibility of detecting signals of split supersymmetry in the loop-induced decay h --> gamma gamma of the Higgs boson at the Large Hadron Collider, where charginos, as surviving light...
Bilarge neutrino mixing from supersymmetry with high-scale nonrenormalizable interactions (2005)
Mukhopadhyaya, Biswarup, Roy, Probir, Srikanth, Raghavendra
We suggest a supersymmetric (SUSY) explanation of neutrino masses and mixing, where nonrenormalizable interactions in the hidden sector generate lepton number violating Majorana mass terms for both...
Associated single photons as signals for a doubly charged scalar at linear e-e- colliders (2005)
Mukhopadhyaya, Biswarup, Rai, Santosh Kumar
Doubly charged scalars, predicted in many models having exotic Higgs representations, can in general have lepton-number violating (LFV) couplings. The basis of most searches for this charged scalar...
Neutrino masses and lepton-number violation in the Littlest Higgs scenario (2005)
Han, Tao, Logan, Heather E., Mukhopadhyaya, Biswarup, Srikanth, Raghavendra
We investigate the sources of neutrino mass generation in Little Higgs theories, by confining ourselves to the "Littlest Higgs" scenario. Our conclusion is that the most satisfactory way of...
Split supersymmetry and the role of a light fermion in a supergravity-based scenario (2005)
Mukhopadhyaya, Biswarup, SenGupta, Soumitra
We investigate split supersymmetry (SUSY) within a supergravity framework, where local SUSY is broken by the F-term of a hidden sector chiral superfield X. With reasonably general assumptions, we...
Split Supersymmetry from Anomalous U(1) (2005)
Babu, K. S., Enkhbat, Ts., Mukhopadhyaya, Biswarup
We present a scenario wherein the anomalous U(1) D-term of string origin triggers supersymmetry breaking and generates naturally a Split Supersymmetry spectrum. When the gaugino and the Higgsino...
Working group report: High energy and collider physics (2004)
Mondal, Naba K, Rindani, Saurabh D, Agashe, Kaustubh, Agrawal, Pankaj, Ananthanarayan, B, Assamagan, Ketevi, ...
This is a summary of the projects undertaken by the working group I on high energy and collider physics
Summary of the Activities of the Working Group I on High Energy and Collider Physics (2004)
Mondal, Naba K., Rindani, Saurabh D., Agrawal, Pankaj, Agashe, Kaustubh, Ananthanarayan, B., Assamagan, Ketevi, ...
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...
R-parity violation in split supersymmetry (2004)
Gupta, Sudhir Kumar, Konar, Partha, Mukhopadhyaya, Biswarup
In the recently proposed `split supersymmetry' scenario, the squark and slepton masses are allowed to be at a high scale while the gauginos and Higgsinos are within a TeV. We show that in a theory...
Sparticle spectrum and phenomenology in split supersymmetry: some possibilities (2004)
Mukhopadhyaya, Biswarup, SenGupta, Soumitra
We investigate the split supersymmetry (SUSY) scenario recently proposed by Arkani-Hamed and Dimopoulos, where the scalars are heavy but the fermions are within the TeV range. We show that the...
Invisible Higgs in theories of large extra dimensions (2004)
Datta, Anindya, Huitu, Katri, Laamanen, Jari, Mukhopadhyaya, Biswarup
We discuss the possibility of detecting a Higgs boson in future collider experiments if large extra dimensions are realized in nature. In such a case, the Higgs boson can decay invisibly by...
Bulk Kalb-Ramond field in Randall Sundrum scenario (2004)
Mukhopadhyaya, Biswarup, Sen, Siddhartha, Sen, Somasri, SenGupta, Soumitra
We have considered the most general gauge invariant five-dimensional action of a second rank antisymmetric Kalb-Ramond tensor gauge theory, including a topological term of the form...
Working group report: High energy and collider physics (2004)
Mondal, Naba K, Rindani, Saurabh D, Agashe, Kaustubh, Agrawal, Pankaj, Ananthanarayan, B, Assamagan, Ketevi, ...
This is a summary of the projects undertaken by the working group I on high energy and collider physics
Gauge boson fusion as a probe of inverted hierarchies in supersymmetry (2003)
Konar, Partha, Mukhopadhyaya, Biswarup
Supersymmetric scenarios with inverted mass hierarchy can be hard to observe at a hadron collider, particularly for the non-strongly interacting sector. We show how the production of stau-pairs via...
Bhabha Scattering with Radiated Gravitons at Linear Colliders (2003)
Dutta, Sukanta, Konar, Partha, Mukhopadhyaya, Biswarup, Raychaudhuri, Sreerup
We study the process e+- e- -> e+- e- +- missing energy at a high-energy e+- e- collider, where the missing energy arises from the radiation of Kaluza-Klein gravitons in a model with large extra...
Slepton production from gauge boson fusion (2003)
Choudhury, Debajyoti, Datta, Anindya, Huitu, Katri, Konar, Partha, Moretti, Stefano, Mukhopadhyaya, Biswarup
We emphasise that charged slepton pairs produced via vector-boson fusion along with two high-mass, high-$p_T$ forward/backward jets (in two opposite hemispheres) can have a higher production...
Das, Prasanta Kumar, Mukhopadhyaya, Biswarup
We consider Higgs pair production at the Large Hadron Collider (LHC) in a Randall-Sundrum scenario containing a radion field. It is shown that the enhanced effective coupling of the radion to gluons,...
Supersymmetry and neutrino mass (2003)
The existence of neutrino mass and mixing is a strong pointer towards physics beyond the standard model. An overview of the possibility of having neutrino masses in supersymmetric theories is...
Parity violation in four and higher dimensional spacetime with torsion (2002)
Mukhopadhyaya, Biswarup, Sen, Somasri, SenGupta, Soumitra, Sur, Saurabh
The possibility of parity violation in a gravitational theory with torsion is extensively explored in four and higher dimensions. In the former case,we have listed our conclusions on when and whether...
Radiative production of invisible charginos in photon photon collision (2002)
Choudhury, Debajyoti, Mukhopadhyaya, Biswarup, Rakshit, Subhendu, Datta, Anindya
If in a supersymmetric model, the lightest chargino is nearly degenerate with the lightest neutralino, the former can decay into the latter alongwith a soft pion (or a lepton-neutrino pair). Near...
Does a Randall-Sundrum scenario create the illusion of a torsion-free universe? (2002)
Mukhopadhyaya, Biswarup, Sen, Somasri, SenGupta, Soumitra
We consider spacetime with torsion in a Randall-Sundrum (RS) scenario where torsion, identified with the rank-2 Kalb-Ramond field, exists in the bulk together with gravity. While the interactions of...
Datta, Anindya, Konar, Partha, Mukhopadhyaya, Biswarup
We point out that vector boson fusion (VBF) at the Large Hadron Collider (LHC) can lead to useful signals for charginos and neutralinos in supersymmetric scenarios where these particles are almost...
Bulk torsion fields in theories with large extra dimensions (2001)
Mukhopadhyaya, Biswarup, Sen, Somasri, SenGupta, Soumitra
We study the consequences of spacetime torsion coexisting with gravity in the bulk in scenarios with large extra dimensions. Having linked torsion with the Kalb-Ramond antisymmetric tensor field...
Datta, Anindya, Konar, Partha, Mukhopadhyaya, Biswarup
We point out that interesting signals of the non-strongly interacting sector of the supersymmetric standard model arise from the production of charginos and neutralinos via vector boson fusion (VBF)...
Spacetime torsion and parity violation: a gauge invariant formulation (2001)
Mukhopadhyaya, Biswarup, SenGupta, Soumitra, Sur, Saurabh
The possibility of parity violation through spacetime torsion has been explored in a scenario containing fields with different spins. Taking the Kalb-Ramond field as the source of torsion, an...
Signals of R-parity Violating Supersymmetry at a Muon Storage Ring (2001)
Datta, Anindya, Gandhi, Raj, Mukhopadhyaya, Biswarup, Mehta, Poonam
Neutrino oscillation signals at muon storage rings (MSR) can be mimicked by Supersymmetric (SUSY) interactions in an R-parity violating scenario. We have investigated the $\tau$-appearance signals...
Heavy quark production via supersymmetric interaction at a neutrino factory (2001)
Chakraverty, Debrupa, Datta, Anindya, Mukhopadhyaya, Biswarup
We investigate b-quark production in both charged and neutral current channels through neutrino-nucleon scattering at a neutrino factory, mediated by the lepton flavour violating interactions present...
Muon anomalous magnetic moment confronts exotic fermions and gauge bosons (2001)
Choudhury, Debajyoti, Mukhopadhyaya, Biswarup, Rakshit, Subhendu
We investigate the status of models containing exotic fermions or extra Z-like neutral gauge bosons in the light of the recent data on anomalous magnetic moment of muon. We find that it is possible...
Signals of R-parity violating supersymmetry in neutrino scattering at muon storage rings (2000)
Datta, Anindya, Gandhi, Raj, Mukhopadhyaya, Biswarup, Mehta, Poonam
Neutrino oscillation signals at muon storage rings can be faked by supersymmetric (SUSY) interactions in an R-parity violating scenario. We investigate the $\tau$-appearance signals for both...
New Higgs signals from vector boson fusion in R-parity violating supersymmetry (2000)
Datta, Anindya, Konar, Partha, Mukhopadhyaya, Biswarup
We investigate signals of the lightest neutral Higgs in an R-parity violating supersymmetric model through the vector boson fusion mechanism. Assuming that R-parity is violated through lepton number,...
Are Messages of R-parity Violating Supersymmetry Hidden within Top Quark Signals ? (2000)
Datta, Aseshkrishna, Mukhopadhyaya, Biswarup
In an R-parity nonconserving supersymmetric theory, the lighter stop can dominantly decay into $b\mu$ and $b\tau$ if R-parity breaking has to explain the neutrino mass and mixing pattern suggested by...
Tevatron Signatures of an R-parity Violating Supersymmetric Theory (1999)
Datta, Aseshkrishna, Mukhopadhyaya, Biswarup, Vissani, Francesco
We show that an R-parity violating supersymmetric scenario which can account for the atmospheric nu(mu) deficit has testable signals at the Fermilab Tevatron with upgraded energy and luminosity. The...
Neutrino mass patterns, R-parity violating supersymmetry and associated phenomenology (1999)
Motivated by the recent SuperKamiokande results on atmospheric neutrinos, we incorporate massive neutrinos, with large angle oscillation between the second and third generations, in a theory with...
Datta, Aseshkrishna, Mukhopadhyaya, Biswarup, Roy, Sourov
The constraints on an R-parity violating supersymmetric theory arising from the recent SuperKamiokande results on atmospheric neutrinos are studied, with special reference to a scenario with bilinear...
Tau-neutrino Appearance Searches using Neutrino Beams from Muon Storage Rings (1999)
Dutta, Sukanta, Gandhi, Raj, Mukhopadhyaya, Biswarup
We study the possibilities offered by muon storage rings for tau-neutrino appearance experiments due to nu_mu to nu_tau and nu_e to nu_tau oscillations. Tau event rates for such experiments are first...
Radiative decay of the lightest neutralino in an R-parity violating supersymmetric theory (1999)
Mukhopadhyaya, Biswarup, Roy, Sourov
In an R-parity violating supersymmetric scenario, the lightest neutralino $\tilde \chi^0_1$ is no longer a stable particle. We calculate the branching ratio for the decay mode $\tilde \chi^0_1...
Tevatron Signatures of an R-parity Violating Supersymmetric Theory (1999)
Datta, Aseshkrishna, Mukhopadhyaya, Biswarup, Vissani, Francesco
A geometrical interpretation of parity violation in gravity with torsion (1998)
Mukhopadhyaya, Biswarup, Sengupta, Soumitra
In a space-time with torsion, the action for the gravitational field can be extended with a parity-violating piece. We show how to obtain such a piece from geometry itself, by suitably modifying the...
Semileptonic charm decay as a test for the spectator model in the $B_c$-meson (1998)
Choudhury, Debajyoti, Kundu, Anirban, Mukhopadhyaya, Biswarup
The $b$ and the $c$ quark compete with each other in decays of the $B_c$-meson. We emphasize the need of obtaining reliable signals of $c \to s$ in order to assess the merits of the spectator...
Mukhopadhyaya, Biswarup, Roy, Sourov, Vissani, Francesco
Motivated by the recent Super-Kamiokande results on atmospheric neutrinos, we incorporate massive neutrinos, with large angle oscillation between the second and third generations, in a scenario with...
Observing Doubly Charged Higgs Bosons in Photon-Photon Collisions (1998)
Chakrabarti, Surajit, Choudhury, Debajyoti, Godbole, Rohini M., Mukhopadhyaya, Biswarup
We discuss the possibility of observing doubly charged Higgs bosons in $\gamma \gamma$ collisions. We find that one can increase the range of observability close to the kinematic limit by a judicious...
Observing Doubly Charged Higgs Bosons in Photon-Photon Collisions (1998)
Chakrabarti, Surajit, Choudhury, Debajyoti, Godbole, Rohini M, Mukhopadhyaya, Biswarup
We discuss the possibility of observing doubly charged Higgs bosons in $\gamma \gamma$ collisions. We find that one can increase the range of observability close to the kinematic limit by a judicious...
Observing Doubly Charged Higgs Bosons in Photon-Photon Collisions (1998)
Chakrabarti, Surajit, Choudhury, Debajyoti, Godbole, Rohini M, Mukhopadhyaya, Biswarup
We discuss the possibility of observing doubly charged Higgs bosons in $\gamma \gamma$ collisions. We find that one can increase the range of observability close to the kinematic limit by a judicious...
Gauge-Mediated Supersymmetry Breaking Signals in an Electron-Photon Collider (1997)
Ghosal, Ambar, Kundu, Anirban, Mukhopadhyaya, Biswarup
We show the usefulness of an $e^-\gamma$ collider with backscattered laser photons in unveiling the signatures of Gauge-Mediated Supersymmetry Breaking models, with a right selectron as the next LSP....
Mukhopadhyaya, Biswarup, Roy, Sourov
We investigate the signal $\gamma\gamma$ + missing energy in a high-energy linear $e^+e^-$ collider, with a view to differentiating between gauge-mediated supersymmetry breaking and the conventional...
Datta, Amitava, Datta, Aseshkrishna, Kundu, Anirban, Mukhopadhyaya, Biswarup, Roy, Sourov
We show that the process $e^+e^- \to \gamma+$ missing energy, arising from the pair production of neutralinos, can probe the $\gamma-\tilde\gamma- \gravitino$ as well as the $Z-\tilde Z-\gravitino$...
Some Implications of a Supersymmetric Model with R-Parity Breaking Bilinear Interactions (1996)
Roy, Sourov, Mukhopadhyaya, Biswarup
We investigate a supersymmetric scenario where R-parity is explicitly broken through a term bilinear in the lepton and Higgs superfields in the superpotential. We show that keeping such a term alone...
Ghosal, Ambar, Kundu, Anirban, Mukhopadhyaya, Biswarup
Using the facts that in Gauge-Mediated Supersymmetry Breaking schemes, masses of the right and the left sfermions can differ widely, and the gravitino is the Lightest Supersymmetric Particle, we show...
Supersymmetry and the spontaneous breaking of a U(1) gauge factor (1996)
Keith, E., Ma, Ernest, Mukhopadhyaya, Biswarup
We investigate a supersymmetric theory with an extra U(1) gauge symmetry surviving down to low energies. The extra U(1) is assumed to originate from an E$_6$ grand unified theory (GUT). We show that...
Unusual Charged Higgs Signals at LEP-2 (1996)
Ghosh, Dilip Kumar, Godbole, Rohini M., Mukhopadhyaya, Biswarup
We have made a detailed study of the signals produced at LEP-2 from charged scalar bosons whose dominant decay channels are into four fermions. The event rates as well as kinematics of the final...
Unusual Charged Higgs Signals at LEP-2 (1996)
Ghosh, Dilip Kumar, Godbole, Rohini M, Mukhopadhyaya, Biswarup
We have made a detailed study of the signals produced at LEP-2 from charged scalar bosons whose dominant decay channels are into four fermions. The event rates as well as kinematics of the final...
Distinctive Signals of spontaneous R-parity breaking at LEP-II (1996)
Adhikari, Rathin, Mukhopadhyaya, Biswarup
We consider the signals of pair-produced charginos in an $e^{+}e^{-}$ collider, in a scenario where R-parity is spontaneously broken. The possibility of lepton-chargino mixing, together with the...
Unusual Charged Higgs Signals at LEP-2 (1996)
Ghosh, Dilip Kumar, Godbole, Rohini M, Mukhopadhyaya, Biswarup
We have made a detailed study of the signals produced at LEP-2 from charged scalar bosons whose dominant decay channels are into four fermions. The event rates as well as kinematics of the final...
Some Signals for a Light Neutralino (1995)
Adhikari, Rathin, Mukhopadhyaya, Biswarup
If a light gaugino sector exists in the supersymmetric standard model then the mass of lightest neutralino may be of the order of 1 GeV or less. As a consequence of neutral flavor violation in...
A General Higgs Sector: Constraints and Phenomenology (1995)
Kundu, Anirban, Mukhopadhyaya, Biswarup
We have investigated some phenomenological aspects of an $SU(2)\times U(1)$ scenario where scalars belonging to arbitrary representations of $SU(2)$ are involved in electroweak symmetry breaking. The...
Tau-Universality Violation with Light Neutralinos (1995)
Adhikari, Rathin, Mukhopadhyaya, Biswarup
In a supersymmetric model with the lightest supersymmetric particle (LSP) $\chi$ in the range of a few hundred MeV's, the decay $\tau {\longrightarrow} \mu \chi \chi$ is going to be allowed. We...
Light Neutralinos in B-Decays (1994)
ADhikari, Rathin, Mukhopadhyaya, Biswarup
We consider the decays of a $B_s$-meson into a pair of lightest supersymmetric particles (LSP) in the minimal supersymmetric standard model. It is found that the parameter space for light LSP's in...
Can We Identify a Light Neutralino in B-Factories (1994)
Adhikari, Rathin, Mukhopadhyaya, Biswarup
If a light gaugino sector exists, then the lightest supersymmetric particle (LSP) has a chance of being pair-produced in rare B-decays. As a consequence of neutral flavour violation in most...
Scalar three-body decays and signals for new physics (1994)
Adhikari, Rathin, Mukhopadhyaya, Biswarup
If massive invisible particles are pair-produced in a three-body decay, then the energy distribution of the other (visible) product is sensitive to the mass of the invisible pair. We use this fact in...
Two-Loop Neutrino Masses and the Solar Neutrino Problem (1994)
Choudhury, Debajyoti, Gandhi, Raj, Gracey, J. A., Mukhopadhyaya, Biswarup
The addition of $m$ singlet right-handed neutrinos to the Standard Model leads to radiatively generated mass corrections for the $SU(2)_L $ doublet neutrinos. For those neutrinos which are massless...
Tevatron Mass Limits for Heavy Quarks Decaying via Flavor Changing Neutral Current (1992)
Mukhopadhyaya, Biswarup, Roy, D. P.
The dimuon and dielectron data from the Tevatron $\bar pp$ collider are used to probe for heavy quarks, which decay dominantly via flavour changing neutral current. Depending on whether the $FCNC$...