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235 papers · 1 filter
Search for anomalous top quark couplings with the D0 detector
D0 Collaboration, V. Abazov
Anomalous Wtb couplings modify the angular correlations of the top quark decay products and change the single top quark production cross section. We present limits on anomalous top…
Excited State Nucleon Spectrum with Two Flavors of Dynamical Fermions
John M. Bulava, Robert G. Edwards, Eric Engelson +8
Highly excited states for isospin 1/2 baryons are calculated for the first time using lattice QCD with two flavors of dynamical quarks. Anisotropic lattices are used with two pion…
Torelli theorem for the Deligne--Hitchin moduli space
Indranil Biswas, Tomas L. Gomez, Norbert Hoffmann +1
Fix integers and , with if . Given a compact connected Riemann surface of genus , let $\MDH(X)$ denote the corresponding $\text{SL}(r, {\ma…
Anisotropy in vortex phase diagram and the pinning force density in the basal plane of YNi_2B_2C
Pradip Das, C. V. Tomy, H. Takeya +2
We present magnetic field dependence of the critical current density from dc-magnetization measurements concerning the anisotropic behavior of flux line lattice (FLL) in a single c…
Peak effect phenomena, surface superconductivity and paramagnetic Meissner effect in a spherical single crystal of niobium
Pradip Das, C. V. Tomy, H. Takeya +2
We have explored the vortex phase diagram in a spherical single crystal of niobium (T ~ 9.3 K) via isothermal and temperature dependent dc magnetization and ac-susceptibility measu…
Thermo-magnetic history effects in the vortex state of YNi_2B_2C superconductor
Pradip Das, C. V. Tomy, H. Takeya +2
The nature of five-quadrant magnetic isotherms for is different from that for in a single crystal of YNi2B2C, pointing towards an anisotropic behaviour of the flux line lattice (FL…
Quasi-viscous accretion flow -- I: Equilibrium conditions and asymptotic behaviour
Jayanta K. Bhattacharjee, Atri Bhattacharya, Tapas K. Das +1
In a novel approach to studying viscous accretion flows, viscosity has been introduced as a perturbative effect, involving a first-order correction in the -viscosity parameter.…
Tunneling studies in a homogeneously disordered s-wave superconductor: NbN
S. P. Chockalingam, Madhavi Chand, Anand Kamlapure +4
We report the evolution of superconducting properties as a function of disorder in homogeneously disordered epitaxial NbN thin films grown on (100) MgO substrates, studied through…
Holomorphic Cartan geometries and Calabi--Yau manifolds
Indranil Biswas, Benjamin McKay
We prove that the only Calabi--Yau projective manifolds which bear holomorphic Cartan geometries are precisely the abelian varieties. (Nous démontrons que les seules variétés proje…
Singular limits for the Riemann problem. General diffusion, relaxation, and boundary conditions
K. T. Joseph, Philippe G. LeFloch
We consider self-similar approximations of nonlinear hyperbolic systems in one space dimension with Riemann initial data and general diffusion matrix. We assume that the matrix of…
Strong fields induce ultrafast rearrangement of H-atoms in HO
F. A. Rajgara, D. Mathur, A. K. Dharmadhikari +1
H-atoms in HO are rearranged by strong optical fields generated by intense, 10 fs laser pulses to form H, against prevailing wisdom that strong fields inevitably lead to…
Heavy Ions at LHC: A Quest for Quark-Gluon Plasma
Rajeev S. Bhalerao, Rajiv V. Gavai
Quantum Chromo Dynamics (QCD), the theory of strong interactions, predicts a transition of the usual matter to a new phase of matter, called Quark-Gluon Plasma (QGP), at sufficient…
Microstate Dependence of Scattering from the D1-D5 System
Sumit R. Das, Gautam Mandal
We investigate the question of distinguishing between different microstates of the D1-D5 system (with charges Q_1 and Q_5), by scattering with an incoherent beam, composed of a sup…
Interplay between superconductivity and magnetism in K-doped EuFe2As2
Anupam, P. L. Paulose, H. S. Jeevan +2
Superconductivity is found in 50% K-doped EuFe2As2 sample below 33 K. Our results of electrical resistivity, magnetic susceptibility and 57Fe and 151Eu Mossbauer spectroscopy provi…
Sign reversal in the exchange bias and the collapse of hysteresis width across the magnetic compensation temperature in a single crystal of Nd0.75Ho0.25Al2
Prasanna D. Kulkarni, A. Thamizhavel, V. C. Rakhecha +4
In the admixed Nd0.75Ho0.25Al2 system, magnetic moments of Nd and Ho occupying the same crystallographic site are antiferromagnetically coupled and the chosen stoichiometry display…
Exchange bias and its phase reversal in the zero magnetization admixed rare earth intermetallics
Prasanna D. Kulkarni, S. Venkatesh, A. Thamizhavel +3
Exchange bias effect is an important attribute in several device applications. Traditionally, it is discussed as a form of exchange anisotropy at the interface between the ferromag…
325-MHz observations of the ELAIS-N1 field using the Giant Metrewave Radio Telescope
S. K. Sirothia, M . Dennefeld, D. J. Saikia +3
We present observations of the European Large-Area {\it ISO} Survey-North 1 (ELAIS-N1) at 325 MHz using the Giant Metrewave Radio Telescope (GMRT), with the ultimate objective of i…
Lh_c
K. Sridhar
The production cross-section of h_c, the 1P_1 charmonium state, can be predicted in Non-Relativistic QCD (NRQCD) using heavy-quark symmetry. We show that at the Large Hadron Collid…
Chandra Observations of Nuclear X-ray Emission from Low Surface Brightness Galaxies
M. Das, C. S. Reynolds, S. N. Vogel +2
We present Chandra detections of x-ray emission from the AGN in two giant Low Surface Brightness (LSB) galaxies, UGC 2936 and UGC 1455. Their x-ray luminosities are 1.8\times10^{42…
On the Thermodynamic Geometry of Hot QCD
Stefano Bellucci, Vinod Chandra, Bhupendra Nath Tiwari
We study the nature of the covariant thermodynamic geometry arising from the free energy of hot QCD. We systematically analyze the underlying equilibrium thermodynamic configuratio…
The origin of the diffuse non-thermal X-ray and radio emission in the Ophiuchus cluster of galaxies
Miguel A. Perez-Torres, Fabio Zandanel, Martin A. Guerrero +4
We present high resolution 240 and 607 MHz GMRT radio observations, complemented with 74 MHz archival VLA radio observations of the Ophiuchus cluster of galaxies, whose radio mini-…
Renormalization group evolution of neutrino masses and mixing in the Type-III seesaw mechanism
Joydeep Chakrabortty, Amol Dighe, Srubabati Goswami +1
We consider the standard model extended by heavy right handed fermions transforming as triplets under SU(2), which generate neutrino masses through the Type-III seesaw mechanis…
The Seventh Data Release of the Sloan Digital Sky Survey
K. Abazajian
This paper describes the Seventh Data Release of the Sloan Digital Sky Survey (SDSS), marking the completion of the original goals of the SDSS and the end of the phase known as SDS…
Temperature dependent Raman and x-ray studies of spin-ice pyrochlore and non-magnetic pyrochlore
Surajit Saha, Surjeet Singh, B. Dkhil +5
We present here temperature-dependent Raman, x-ray diffraction and specific heat studies between room temperature and 12 K on single crystals of spin-ice pyrochlore compound $Dy_2T…