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100 papers · 1 filter
Supersymmetric theories with explicit R-parity violation
Probir Roy
and motivation for explicit $R\!\!\!/}_p$, MSSM $ R\!\!\!/}_p$ MSSM, Bounds on couplings, Collider-specific phenomenology, Cosmological implicati…
A fit to the simultaneous broadband spectrum of Cygnus X-1 using the transition disk model
R. Misra, V. R. Chitnis, F. Melia
We have used the transition disk model to fit the simultaneous broad band ( keV) spectrum of Cygnus X-1 from OSSE and Ginga observations. In this model, the spectrum is prod…
A Measurement of the W Boson Mass
B. Abbott, M. Abolins, B. S. Acharya
We present a measurement of the W boson mass using data collected by the D0 experiment at the Fermilab Tevatron during 1994--1995. We identify W bosons by their decays to fina…
A Measurement of the W Boson Mass
B. Abbott, M. Abolins, B. S. Acharya
We report a measurement of the W boson mass based on an integrated luminosity of 82 pb from \ppbar collisions at TeV recorded in 1994--1995 by the \Dzero dete…
Boosts, Schwarzschild Black Holes and Absorption cross-sections in M theory
Sumit R. Das, Samir D. Mathur, S. Kalyana Rama +1
dimensional neutral black strings wrapped on a circle are related to dimensional charged black holes by boosts. We show that the boost has to be performed in the coveri…
Using Drell-Yan Processes to Probe Nucleon and Meson Structure Functions
R. S. Bhalerao, J. T. Londergan
We investigate how Drell-Yan processes can be used to measure the magnitude of flavor symmetry violation in the proton sea. We examine the utility of the following beams: protons,…
ARPES study of the superconducting gap and pseudogap in Bi2Sr2CaCu2O8+x
H. Ding, J. C. Campuzano, M. R. Norman +8
In this paper, we review some of our ARPES results on the superconducting and pseudo gaps in Bi2Sr2CaCu2O8+x. We find that optimally and overdoped samples exhibit a d-wave gap, whi…
Aspects of hadronic production
K. Sridhar
In this talk, I start with a brief introduction to Non-Relativistic QCD (NRQCD) and its applications to quarkonium physics. This theory has provided a consistent framework for the…
Driven Lattice Gases with Quenched Disorder: Exact Results and Different Macroscopic Regimes
Goutam Tripathy, Mustansir Barma
We study the effect of quenched spatial disorder on the steady states of driven systems of interacting particles. Two sorts of models are studied: disordered drop-push processes an…
Phenomenology of Photoemission Lineshapes of High Tc Superconductors
M. R. Norman, M. Randeria, H. Ding +1
We introduce a simple phenomenological form for the self-energy which allows us to extract important information from angle resolved photoemission data on the high Tc superconducto…
ORT observations of the damped Lyman alpha system towards PKS 0201+113
Nissim Kanekar, Jayaram N Chengalur
We report a deep radio search with the Ooty Radio Telescope (ORT) for the redshifted 21 cm absorption line from the damped Lyman alpha system seen at redshift 3.388 against the qua…
Null Geodesic Expansion in Spherical Gravitational Collapse
T. P. Singh
We derive an expression for the expansion of outgoing null geodesics in spherical dust collapse and compute the limiting value of the expansion in the approach to singularity forma…
BPS Nature of 3-String Junctions
Keshav Dasgupta, Sunil Mukhi
We study BPS-saturated classical solutions for the world-sheet theory of a D-string in the presence of a point charge. These solutions are interpreted as describing planar 3-string…
Search for First Generation Scalar Leptoquark Pairs in ppbar Collisions at sqrt(s)=1.8 TeV
DZERO Collaboration, B. Abbott
We have searched for first generation scalar leptoquark (LQ) pairs in the enu+jets channel using ppbar collider data (integrated luminosity= 115 pb^-1) collected by the DZero exper…
Zgamma Production in pbarp Collisions at sqrt(s)=1.8 TeV and Limits on Anomalous ZZgamma and Zgammagamma Couplings
D0 Collaboration
We present a study of Z +gamma + X production in p-bar p collisions at sqrt{S}=1.8 TeV from 97 (87) pb^{-1} of data collected in the eegamma (mumugamma) decay channel with the D0 d…
Recent Developments in String Theory: A Brief Review for Particle Physicists
Sunil Mukhi
At the present time, string theory (and its generalizations) remain relatively abstruse subjects to the particle phenomenologist and experimentalist. Yet, striking developments of…
Broad band X-ray spectrum of Cygnus X-1
V. R. Chitnis, A. R. Rao, P. C. Agrawal
We present the hard X-ray (20-100 keV) observations of Cygnus X-1 obtained using a large area balloon-borne Xenon filled Multi-anode Proportional Counter (XMPC) telescope. The obse…
Quasi-regular X-ray bursts from GRS 1915+105 observed with the IXAE: possible evidence for matter disappearing into the event horizon of the black hole
B. Paul, P. C. Agrawal, A. R. Rao
Three different types of very intense, quasi-regular X-ray bursts have been observed from the Galactic superluminal X-ray transient source GRS 1915+105 with the Pointed Proportiona…
X-ray variability of GRS 1915+105 during the low-hard state observed with the Indian X-ray astronomy experiment (IXAE)
B. Paul, P. C. Agrawal, A. R. Rao
The galactic superluminal transient X-ray source GRS 1915+105 was observed with the pointed proportional counters (PPCs) onboard the Indian satellite IRS-P3 during 1996 July 23-27.…
Precursor Pairing Correlations and Pseudogaps
Mohit Randeria
I begin by briefly reviewing various experimental results on the pseudogap phenomena in underdoped cuprates. I argue that, taken together, all of these lead to a picture of singlet…
Theory of Size-Driven Transitions in Displacive and Order-Disorder Ferroelectrics
K. Sheshadri, Rangan Lahiri Pushan Ayyub, Shobo Bhattacharya
We present a simple theory for structural transitions in displacive ferroelectrics of the perovskite type. In our theory, the competition between the elastic energy cost for the di…
Seismic inversions for temperature and chemical composition profiles in the solar interior
H. M. Antia, S. M. Chitre
The primary inversion of the accurately measured frequencies of solar oscillations determines the mechanical properties of the Sun, i.e., the sound speed and density as a function…
Determination of the Mass of the W Boson Using the D0 Detector at the Tevatron
B. Abbott
A measurement of the mass of the W boson is presented which is based on a sample of 5982 W -> e nu decays observed in pbar-p collisions at sqrt(s) = 1.8 TeV with the D0 detector du…
Enhanced Three-Body Decay of the Charged Higgs Boson
Ernest Ma, D. P Roy, Jose Wudka
If the charged Higgs boson H+ exists with mh < mt + mb, the conventional expectation is that it will decay dominantly into c s-bar and tau+ nu-tau. However, the three-body decay mo…