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147 papers · 1 filter
Hard Single Diffraction in pbarp Collisions at root-s = 630 and 1800 GeV
The D0 Collaboration, B. Abbott
Using the D0 detector, we have studied events produced in proton-antiproton collisions that contain large forward regions with very little energy deposition (``rapidity gaps'') and…
K-causality and degenerate spacetimes
H. F. Dowker, R. S. Garcia, S. Surya
The causal relation was introduced by Sorkin and Woolgar to extend the standard causal analysis of spacetimes to those that are only . Most of their results also h…
Quantum Radiation from Black Holes and Naked Singularities in Spherical Dust Collapse
T. P. Singh, Cenalo Vaz
A sufficiently massive collapsing star will end its life as a spacetime singularity. The nature of the Hawking radiation emitted during collapse depends critically on whether the s…
A duality for Spin Verlinde spaces and Prym theta functions
C. Pauly, S. Ramanan
We prove canonical isomorphisms between Spin Verlinde spaces, i.e, spaces of global sections of a determinant line bundle over the moduli space of semistable Spin-bundles over a sm…
Dynamic instabilities and memory effects in vortex matter
Y. Paltiel, E. Zeldov, Y. N. Myasoedov +7
Recent studies have shown a number of surprising vortex dynamics phenomena both in low and high temperature superconductors, which include: low frequency noise, slow voltage oscill…
The Isolated Photon Cross Section in p pbar Collisions at sqrt(s) = 1.8 TeV
D0 Collaboration, B. Abbott
We report a new measurement of the cross section for the production of isolated photons, with transverse energies (ET) above 10 GeV and pseudorapidities |eta| < 2.5, in p pbar coll…
Parabolic bundles and representations of the fundamental group
Tomas L. Gomez, T. R. Ramadas
Let X be as smooth complex projective variety with Neron-Severi group isomorphic to Z, and D an irreducible divisor with normal crossing singularities. Assume r is equal to 2 or 3.…
A Measurement of the W to tau+nu Production Cross Section in p-pbar Collisions at sqrt(s) = 1.8 TeV
D0 Collaboration, B. Abbott
We report on a measurement of sigma(p-pbar to W+X) times B(W to tau+nu) in p-pbar collisions at sqrt(s) = 1.8 TeV at the Fermilab Tevatron. The measurement is based on an integrate…
Limits on Anomalous WWgamma and WWZ Couplings from WW/WZ->enujj Production
D0 collaboration, B. Abbott, M. Abolins
Limits on anomalous WWgamma and WWZ couplings are presented from a study of WW/WZ->enujj events in ppbar collisions at sqrt{s}=1.8 TeV. Results from the analysis of data collected…
Probing BFKL Dynamics in the Dijet Cross Section at Large Rapidity Intervals in ppbar Collisions at sqrt{s}=1800 and 630 GeV
D0 Collaboration, B. Abbott
Inclusive dijet production at large pseudorapidity intervals (delta_eta) between the two jets has been suggested as a regime for observing BFKL dynamics. We have measured the dijet…
Limits on Quark Compositeness from High Energy Jets in PbarP Collisions at 1.8 TeV
D0 collaboration, B. Abbott
Events in PbarP collisions at sqrt(s)=1.8 TeV with total transverse energy exceeding 500 GeV are used to set limits on quark substructure. The data are consistent with next-to-lead…
Algebraic stacks
T. Gomez
This is an expository article on the theory of algebraic stacks. After introducing the general theory, we concentrate in the example of the moduli stack of vector budles, giving a…
Stability of conic bundles (with an appendix by Mundet i Riera)
T. Gomez, I. Sols
Roughly speaking, a conic bundle is a surface, fibered over a curve, such that the fibers are conics (not necessarily smooth). We define stability for conic bundles and construct a…
Rapid dissipation of magnetic fields due to Hall current
S. I. Vainshtein, S. M. Chitre, A. V. Olinto
We propose a mechanism for the fast dissipation of magnetic fields which is effective in a stratified medium where ion motions can be neglected. In such a medium, the field is froz…
Supergravity with Self-dual B fields and Instantons in Noncommutative Gauge Theory
S. R. Das, S. Kalyana Rama, S. P. Trivedi
We study Type IIB supergravity in the presence of (euclidean) D3 branes and nonzero self-dual B-fields. We point out that the Einstein frame metric is identical to the full geometr…
Measurement of the Probability of Gluon Splitting into Charmed Quarks in Hadronic Z Decays
L3 Collaboration
We have measured the probability, n(g->cc~), of a gluon splitting into a charm-quark pair using 1.7 million hadronic Z decays collected by the L3 detector. Two independent methods…
Radio Ranging Techniques to test Relativistic Gravitation
R. Cowsik
It is suggested that modern techniques of radio ranging when applied to study the motion of the Moon, can improve the accuracy of tests of relativistic gravitation obtained with cu…
Effect of asymmetry in peak profiles on solar oscillation frequencies
Sarbani Basu, H. M. Antia
Most helioseismic analyses are based on solar oscillations frequencies obtained by fitting symmetric peak profiles to the power spectra. However, it has now been demonstrated that…
Model for Polarized and Unpolarized Parton Density Functions in the Nucleon
R. S. Bhalerao, N. G. Kelkar, B. Ram
We present a physical model for polarized and unpolarized structure functions and parton density functions (PDFs) of the proton and the neutron. It reproduces the data on F_2^p(x,Q…
An ultra-soft X-ray source (RX 215319-1514) and discovery of a narrow line Seyfert 1 galaxy
Kulinder Pal Singh, Laurence R. Jones
Two optical candidates - a galaxy and a star, are found within the error circle of the X-ray source position of an ultra-soft X-ray source discovered with ROSAT. Optical spectrosco…
Search for Extra Dimensions in Boson and Fermion Pair Production in e+e- Interactions at LEP
L3 Collaboration
Extra spatial dimensions are proposed by recent theories that postulate the scale of gravity to be of the same order as the electroweak scale. A sizeable interaction between gravit…
D1/D5 System with B-field, Noncommutative Geometry and the CFT of the Higgs Branch
Avinash Dhar, Gautam Mandal, Spenta R. Wadia +1
The D1/D5 system is considered in the presence of the NS B field. An explicit supergravity solution in the asymptotically flat and near horizon limits is presented. Explicit mass f…
Search for Neutral Higgs Bosons of the Minimal Supersymmetric Standard Model in e+e- Interactions at \sqrt{s} = 189 GeV
L3 Collaboration
A search for the lightest neutral scalar and neutral pseudoscalar Higgs bosons in the Minimal Supersymmetric Standard Model is performed using 176.4 pb^-1 of integrated luminosity…
Search for Second Generation Leptoquark Pairs in pbar-p Collisions at sqrt(s) = 1.8 TeV
B. Abbott
We have searched for second generation leptoquark (LQ) pairs in the μμ+jets channel using 94+-5 pb^{-1} of pbar-p collider data collected by the D0 experiment at the Fermilab Tevat…