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22 papers · 2 filters
Constraints on the Charged Higgs Sector from the Tevatron Collider Data on Top Quark Decay
Monoranjan Guchait, D. P. Roy
The top quark data in the lepton plus channel offers a viable probe for the charged Higgs boson signal. We analyse the recent Tevatron collider data in this channel to obtain a…
Quarkonium production via fragmentation: A review
K. Sridhar
We review the physics of quarkonium production at high energy colliders, with a specific emphasis on production fragmentation. We discuss the fragmentation picture for the pr…
The transitions and oscillations
G. V. Dass, K. V. L. Sarma
We estimate the product of the relative strength of the amplitude in the decay and the width-difference parameter . For…
J/psi Spin Asymmetries in the Colour-Octet Model
Sourendu Gupta, Prakash Mathews
We investigate the pattern of asymmetries in the colour-octet model for inclusive production of charmonium with polarised initial state hadrons and photons. We find that singly pol…
Squark Gluino Mass Limits Revisited For Nonuniversal Scalar Masses
Amitava Datta, Monoranjan Guchait, Nirmalaya Parua
It is shown that if the sneutrino is the second lightest SUSY particle, then the decay products of squarks and gluinos produced at the TEVATRON collider tend to have i) more lepton…
Colour-octet Contributions to Distributions in Hadro-production at Fixed Target Energies
Sourendu Gupta, K. Sridhar
We study J/ψproduction at fixed-target energies, including the colour-octet production mechanisms predicted by NRQCD. In an earlier paper, we found that the octet components were c…
1P1 charmonium production at the Tevatron
K. Sridhar
The production of the charmonium state, , at large- at the Tevatron is considered. The colour-octet contributions to this state are found to be dominant and giv…
Bounds from production on R-parity violating models of supersymmetry
Dilip Kumar Ghosh, Sreerup Raychaudhuri, K. Sridhar
We study production in R-parity violating supersymmetry. The annihilation channel gets new contributions from -channel exchange of squ…
SUSY Contributions to and Top Decay
D. P. Roy
I report on a systematic analysis of the MSSM parameter space to obtain the best SUSY solution to the anomaly within the constraint of top quark decay. Phenomenological impli…
Statistical Model for the Nucleon Structure Functions
R. S. Bhalerao
A phenomenological model for the nucleon structure functions is presented. Visualising the nucleon as a cavity filled with parton gas in equilibrium and parametrizing the effects d…
Dilepton asymmetries at factories in search of transitions
G. V. Dass, K. V . L. Sarma
In order to detect the possible presence of amplitudes in neutral meson decays, we consider the measurement of decay time asymmetries involving like-sign dilepton e…
Charmonium Production
K. Sridhar
Theoretical analyses of the results on quarkonium production at large transverse momentum () in collisions, at the Tevatron have revealed two novel features of the p…
SUSY Contributions to R_b and Top Quark Decay
Manuel Drees, R. M. Godbole, Monoranjan Guchait +2
Stop contributions to radiative corrections to R_b and the top quark decay are analysed over the relevant MSSM parameter space. One sees a 30 % increase in the former along with a…
Matter induced rho-omega mixing
Abhee K. Dutt-Mazumder, Binayak Dutta-Roy, Anirban Kundu
A novel mechanism for mixing induced by neutron-proton asymmetry in nuclear matter is uncovered and the variation of the mixing angle with the extent of asymmetry is presente…
Can the Aleph Four-Jet Excess be Explained in a Supersymmetric Model with R-Parity Violation?
Dilip Kumar Ghosh, Rohini M. Godbole, Sreerup Raychaudhuri
We investigate the possibility that the excess of four-jet events in collisions at LEP-1.5 which has been reported by the ALEPH Collaboration could be due to the productio…
Virtual LSPs at e+ e- Colliders
Amitava Datta, Aseshkrishna Datta, Sreerup Raychaudhuri
Currently popular search strategies for supersymmetric particles may be significantly affected due to relatively light sneutrinos which decay dominantly into invisible channels. In…
New Constraints On Lepton Nonconserving R-parity Violating Couplings
Debajyoti Choudhury, Probir Roy
Strong upper bounds are derived on certain product combinations of lepton nonconserving couplings in the minimal supersymmetric standard model with explicit -parity violation. T…
Like Sign Dilepton Signature for R-Parity Violating SUSY Search at the Tevatron Collider
Monoranjan Guchait, D. P. Roy
The like sign dileptons provide the most promising signature for superparticle search in a large category of -parity violating SUSY models. We estimate the like sign dilepton si…
Applicability of Heavy Quark Effective Theory to the Radiative Decay
Debrupa Chakraverty, Triptesh De, Binayak Dutta-Roy +1
In the context of the observed decay the applicability of the Heavy Quark Effective Theory (HQET), treating both b and s as heavy quarks, is examined. We show…
A general treatment of oblique parameters
Anirban Kundu, Probir Roy
A reexamination is made of one-loop oblique electroweak corrections. General definitions are given of the oblique parameters without reference to any -expansion scheme. The ol…
Charmonium Production at the LHC
K. Sridhar
The analyses of large transverse momentum charmonium production at the Tevatron have shown that fragmentation of gluons is an important production mechanism. We study large- c…
Colour-octet Contributions to J/psi Hadroproduction at Fixed Target Energies
Sourendu Gupta, K. Sridhar
We investigate the integrated cross section for forward $\jpsi$ production in proton-proton and pion-proton collisions at centre of mass energies upto 60 GeV. We find that colour-o…