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270 papers · 1 filter
Measurement of the top quark pair production cross section in the lepton+jets channel in proton-antiproton collisions at =1.96 TeV
D0 Collaboration, V. Abazov
We present a measurement of the inclusive top quark pair production cross section in \ppbar collisions at (\sqrt{s}=1.96) TeV utilizing data corresponding to an integrated luminosi…
Measurement of the Inclusive Upsilon production cross section in pp collisions at sqrt(s)=7 TeV
CMS Collaboration
The Upsilon production cross section in proton-proton collisions at sqrt(s) = 7 TeV is measured using a data sample collected with the CMS detector at the LHC, corresponding to an…
Charge inhomogeneities and transport in semiconductor heterostructures with a manganese -layer
Vikram Tripathi, Kusum Dhochak, B. A. Aronzon +5
We study experimentally and theoretically the effects of disorder, nonlinear screening, and magnetism in semiconductor heterostructures containing a -layer of Mn, where the char…
Neel to staggered dimer order transition in a generalized honeycomb lattice Heisenberg model
Argha Banerjee, Kedar Damle, Arun Paramekanti
We study a generalized honeycomb lattice spin-1/2 Heisenberg model with nearest-neighbor antiferromagnetic 2-spin exchange, and competing 4-spin interactions which serve to stabili…
Determinant line bundle on moduli space of parabolic bundles
Indranil Biswas
In \cite{BR1}, \cite{BR2}, a parabolic determinant line bundle on a moduli space of stable parabolic bundles was constructed, along with a Hermitian structure on it. The constructi…
Effect of Noise on Patterns Formed by Growing Sandpiles
Tridib Sadhu, Deepak Dhar
We consider patterns generated by adding large number of sand grains at a single site in an abelian sandpile model with a periodic initial configuration, and relaxing. The patterns…
A homology plane of general type can have at most a cyclic quotient singularity
R. V. Gurjar, M. Koras, M. Miyanishi +1
We show that a homology plane of general type has at worst a single cyclic quotient singular point. An example of such a surface with a singular point does exist. We also show that…
Search for Pair Production of Second-Generation Scalar Leptoquarks in pp Collisions at sqrt(s) = 7 TeV
The CMS Collaboration
A search for pair production of second-generation scalar leptoquarks in the final state with two muons and two jets is performed using proton-proton collision data at sqrt(s) = 7 T…
Search for Pair Production of First-Generation Scalar Leptoquarks in pp Collisions at sqrt(s) = 7 TeV
The CMS Collaboration
A search for pair production of first-generation scalar leptoquarks is performed in the final state containing two electrons and two jets using proton-proton collision data at sqrt…
Frobenius pull backs of vector bundles in higher dimensions
V. Trivedi
Here we prove that for a smooth projective variety of arbitrary dimension and for a vector bundle over , the Harder-Narasimhan filtration of a Frobenius pull back of …
Impurity spin texture at a Néel-Valence Bond Solid critical point in SU(3) quantum antiferromagnets
Argha Banerjee, Kedar Damle, Fabien Alet
We study the impurity physics at a continuous quantum phase transition from an SU(3) symmetric Néel ordered state to a valence bond solid state that breaks lattice symmetries, usin…
Effect of Si and Ga substitutions on the magnetocaloric properties of NiCoMnSb quaternary Heusler alloys
Roshnee Sahoo, Ajaya K. Nayak, K. G. Suresh +1
The effect of Si and Ga substitutions on the magnetic and the magnetocaloric properties in Heusler based system Ni46Co4Mn38Sb12-xZx (Z=Si and Ga) has been studied. From the M(T) pl…
Axions as Quintessence in String Theory
Sudhakar Panda, Yoske Sumitomo, Sandip P. Trivedi
We construct a model of quintessence in string theory based on the idea of axion monodromy as discussed by McAllister, Silverstein and Westphal arXiv:0808.0706. In the model, the q…
Instruments of RT-2 Experiment onboard CORONAS-PHOTON and their test and evaluation V: Onboard software, Data Structure, Telemetry and Telecommand
S. Sreekumar, P. Vinod, Essy Samuel +9
The onboard software and data communication in the RT-2 Experiment onboard the Coronas-Photon satellite is organized in a hierarchical way to effectively handle and communicate asy…
Instruments of RT-2 Experiment onboard CORONAS-PHOTON and their test and evaluation IV: Background Simulations using GEANT-4 Toolkit
Ritabrata Sarkar, Samir Mandal, Dipak Debnath +4
Hard X-ray detectors in space are prone to background signals due to the ubiquitous cosmic rays and cosmic diffuse background radiation that continuously bombards the satellites wh…
Instruments of RT-2 Experiment onboard CORONAS-PHOTON and their test and evaluation III: Coded Aperture Mask and Fresnel Zone Plates in RT-2/CZT Payload
Anuj Nandi, S. Palit, D. Debnath +7
Imaging in hard X-rays of any astrophysical source with high angular resolution is a challenging job. Shadow-casting technique is one of the most viable options for imaging in hard…
Instruments of RT-2 Experiment onboard CORONAS-PHOTON and their test and evaluation II: RT-2/CZT payload
Tilak B. Kotoch, Anuj Nandi, D. Debnath +6
Cadmium Zinc Telluride (CZT) detectors are high sensitivity and high resolution devices for hard X-ray imaging and spectroscopic studies. The new series of CZT detector modules (OM…
Search for associated production in 5.3 fb of collisions at the Fermilab Tevatron
D0 Collaboration, V. Abazov
We present a search for associated production of Higgs and bosons in collisions at a center of mass energy of TeV in 5.3 fb of integrated lumi…
Ultra High Energy Cosmic Ray Acceleration in Engine-driven Relativistic Supernovae
Sayan Chakraborti, Alak Ray, Alicia Soderberg +2
The origin of the highest energy cosmic rays remains an enigma. They offer a window to new physics, including tests of physical laws relevant to their propagation and interactions,…
Detection of GRB 090618 with RT-2 Experiment Onboard the Coronas-Photon Satellite
A. R. Rao, J. P. Malkar, M. K. Hingar +16
We present the results of an analysis of the prompt gamma-ray emission from GRB 090618 using the RT-2 Experiment onboard the Coronas-Photon satellite. GRB 090618 shows multiple pea…
Entropy power inequality for a family of discrete random variables
Naresh Sharma, Smarajit Das, Siddharth Muthukrishnan
It is known that the Entropy Power Inequality (EPI) always holds if the random variables have density. Not much work has been done to identify discrete distributions for which the…
Boosted top quarks in supersymmetric cascade decays at the LHC
Priyotosh Bandyopadhyay, Biplob Bhattacherjee
At the LHC, a generic supersymmetric cascade can be a source of top quark. Specifically third generation squarks and gluino are the major sources of top quark which could also be b…
Unsolved Problems in Visibility Graphs of Points, Segments and Polygons
Subir Kumar Ghosh, Partha Pratim Goswami
In this survey paper, we present open problems and conjectures on visibility graphs of points, segments and polygons along with necessary backgrounds for understanding them.
Moduli of vortices and Grassmann manifolds
Indranil Biswas, Nuno M. Romão
We use the framework of Quot schemes to give a novel description of the moduli spaces of stable n-pairs, also interpreted as gauged vortices on a closed Riemann surface with target…