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209 papers · 1 filter
Determination of the strong coupling constant from the inclusive jet cross section in ppbar collisions at sqrt(s)=1.96 TeV
D0 Collaboration, V. M. Abazov
We determine the strong coupling constant alphas and its energy dependence from the pT dependence of the inclusive jet cross section in ppbar collisions at sqrt(s)=1.96 TeV. The st…
Nainital Microlensing Survey -- detection of short period Cepheids in the disk of M31
Y. C. Joshi, D. Narasimha, A. K. Pandey +1
The discovery of large number of Cepheid variables in far-off galaxies offers a unique opportunity to determine the accurate distance of the host galaxy through their period-lumino…
A Multiwavelength Study of a Young, Z-shaped, FR I Radio Galaxy NGC 3801
Ananda Hota, Jeremy Lim, Youichi Ohyama +3
We present preliminary results from a multi-wavelength study of a merger candidate, NGC3801, hosting a young FR I radio galaxy, with a Z-shaped structure. Analysing archival data f…
Charmonium suppression in the presence of dissipative forces in a strongly coupled quark-gluon plasma
Binoy Krishna Patra, Vineet Agotiya, Vinod Chandra
We study the survival of charmonium states in a strongly-coupled quark-gluon plasma in the presence of dissipative forces. We consider first-order dissipative corrections to the pl…
Influence of pressure on the magnetic behavior and the anomalous magnetoresistance in Tb5Si3
Niharika Mohapatra, Sitikantha D Das, K. Mukherjee +2
The compound, Tb5Si3, crystallizing in Mn5Si3-type hexagonal structure, was recently reported by us to exhibit a sudden and huge enhancement in electrical resistivity (rho) at a cr…
Evolution of Solar Magnetic Field and Associated Multi-wavelength Phenomena: Flare events on 20 November 2003
Pankaj Kumar, P. K. Manoharan, Wahab Uddin
We analyze H-alpha images, soft X-ray profiles, magnetograms, extreme ultra-violet images and radio observations of two homologous flare events (M1.4/1N and M9.6/2B) on 20 November…
Measuring the spin of the primary black hole in OJ287
M. J. Valtonen, S. Mikkola, D. Merritt +7
The compact binary system in OJ287 is modelled to contain a spinning primary black hole with an accretion disk and a non-spinning secondary black hole. Using Post Newtonian (PN) ac…
Search for the associated production of a b quark and a neutral supersymmetric Higgs boson which decays to tau pairs
D0 Collaboration, V. M. Abazov
We report results from a search for production of a neutral Higgs boson in association with a quark. We search for Higgs decays to pairs with one subsequently decaying…
Importance of conduction electron correlation in a Kondo lattice, Ce2CoSi3
Swapnil Patil, Sudhir Pandey, V. R. R. Medicherla +4
Kondo systems are usually described by the interaction of strong correlation induced local moment with the highly itinerant conduction electrons. Here, we study the role of electro…
Search for the Standard Model Higgs Boson in the ZH->vvbb Channel in 5.2 fb-1 of p-pbar Collisions at sqrt(s)=1.96 TeV
D0 Collaboration
A search is performed for the standard model Higgs boson in 5.2 fb-1 of p-pbar collisions at sqrt(s)=1.96 TeV, collected with the D0 detector at the Fermilab Tevatron Collider. The…
Double parton interactions in photon+3 jet events in ppbar collisions sqrt{s}=1.96 TeV
D0 Collaboration
We have used a sample of photon+3 jets events collected by the D0 experiment with an integrated luminosity of about 1 fb^-1 to determine the fraction of events with double parton s…
Static spherically symmetric scalar field spacetimes with C^0 matching
Swastik Bhattacharya, Pankaj S. Joshi
All the classes of static massless scalar field models available currently in the Einstein theory of gravity necessarily contain a strong curvature naked singularity. We obtain her…
On moduli spaces of Hitchin pairs
Indranil Biswas, Peter B. Gothen, Marina Logares
Let be a compact Riemann surface of genus at--least two. Fix a holomorphic line bundle over . Let be the moduli space of Hitchin pairs $(E ,ϕ\in H^0(End…
Observation of a charmonium-like enhancement in the gamma gamma --> omega J/psi process
The Belle Collaboration, S. Uehara
We report the results of a search for a charmonium-like state produced in the process gamma gamma --> omega J/psi in the 3.9-4.2 GeV/c^2 mass region. We observe a significant enhan…
Magnetic impurities in the honeycomb Kitaev model
Kusum Dhochak, R. Shankar, V. Tripathi
We study the effect of coupling magnetic impurities to the honeycomb lattice spin-1/2 Kitaev model in its spin liquid phase. We show that a spin-S impurity coupled to the Kitaev mo…
Nonlinear quantum mechanics, the superposition principle, and the quantum measurement problem
Kinjalk Lochan, T. P. Singh
There are four reasons why our present knowledge and understanding of quantum mechanics could be regarded as incomplete. Firstly, the principle of linear superposition has not been…
Transmission Capacity of Ad-hoc Networks with Multiple Antennas using Transmit Stream Adaptation and Interference Cancelation
Rahul Vaze, Robert W. Heath
The transmission capacity of an ad-hoc network is the maximum density of active transmitters per unit area, given an outage constraint at each receiver for a fixed rate of transmis…
Evidence for a new resonance and search for the Y(4140) in
The Belle Collaboration, C. P. Shen
The process $γγ\to ϕ\jpsi$ is measured for $ϕ\jpsi$ masses between threshold and 5 GeV/, using a data sample of 825 fb collected with the Belle detector. A narrow…
New-physics contributions to the forward-backward asymmetry in B -> K* mu+ mu-
Ashutosh Kumar Alok, Amol Dighe, Diptimoy Ghosh +4
We study the forward-backward asymmetry (AFB) and the differential branching ratio (DBR) in B -> K* mu+ mu- in the presence of new physics (NP) with different Lorentz structures. W…
Search for single top quarks in the tau+jets channel using 4.8 fb of collision data
The D0 Collaboration
We present the first direct search for single top quark production using tau leptons. The search is based on 4.8 fb of integrated luminosity collected in collisio…
Search for a resonance decaying into WZ boson pairs in collisions
The D0 Collaboration, V. M. Abazov
We present the first search for an electrically charged resonance decaying to a WZ boson pair using 4.1 fb of integrated luminosity collected with the D0 detector…
Simultaneous observations of a pair of kilohertz QPOs and a plausible 1860 Hz QPO from an accreting neutron star system
Sudip Bhattacharyya
We report an indication (3.22 sigma) of ~ 1860 Hz quasi-periodic oscillations from a neutron star low-mass X-ray binary 4U 1636-536. If confirmed, this will be by far the highest f…
Renormalization group flows in a Lifshitz-like four fermi model
Avinash Dhar, Gautam Mandal, Partha Nag
We study renormalization group flows in the Lifshitz-like -flavour four fermi model discussed in 0905.2928. In the large- limit, a nontrivial flow occurs in only one of all p…
The Next-to-Simplest Quantum Field Theories
Shailesh Lal, Suvrat Raju
We describe new on-shell recursion relations for tree-amplitudes in N=1 and N=2 gauge theories and use these to show that the structure of the S-matrix in pure N=1 and N=2 gauge th…