Showing 2001Show all

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astro-ph2001★ 18 cited

557 GHz Observations of Water Vapor Outflows from VY CMa and W Hydrae

Martin Harwit, Edwin A. Bergin

We report the first detection of thermal water vapor emission in the 557 GHz, ground state transition of ortho-HO toward VY Canis Majoris. In observations obt…

hep-ex2001

Measurement of HQET Parameters and CKM Matrix Elements

David Urner

The determination of CKM matrix elements in the b-sector is discussed, emphasizing the new measurements of Vub and Vcb by the CLEO collaboration.

astro-ph2001★ 13 cited

Artifacts at 4.5 and 8.0 um in Short Wavelength Spectra from the Infrared Space Observatory

Stephan D. Price, G. C. Sloan, Kathleen E. Kraemer

Spectra from the Short Wavelength Spectrometer (SWS) on ISO exhibit artifacts at 4.5 and 8 um. These artifacts appear in spectra from a recent data release, OLP 10.0, as spurious b…

hep-ph2001★ 78 cited

Effects of the Intergalactic Plasma on Supernova Dimming via Photon-Axion Oscillations

Csaba Csaki, Nemanja Kaloper, John Terning

We have recently proposed a mechanism of photon-axion oscillations as a way of rendering supernovae dimmer without cosmic acceleration. Subsequently, it has been argued that the in…

cs.CL2001

Fast Context-Free Grammar Parsing Requires Fast Boolean Matrix Multiplication

Lillian Lee

In 1975, Valiant showed that Boolean matrix multiplication can be used for parsing context-free grammars (CFGs), yielding the asympotically fastest (although not practical) CFG par…

nucl-th2001★ 8 cited

Aspects of meson properties in dense nuclear matter

O. Teodorescu, A. K. Dutt-Mazumder, C. Gale

We investigate the modification of meson spectral densities in dense nuclear matter at zero temperature. These effects are studied in a fully relativistic mean field model which go…

hep-ex2001★ 2 cited

CLEO Results: B Decays

David G. Cassel

Measurements of many Standard Model constants are clouded by uncertainties in nonperturbative QCD parameters that relate measurable quantities to the underlying parton-level proces…

hep-ph2001★ 2 cited

Flavor-Change with Ultra-Light Sbottom and Gluinos

Thomas Becher, Stephan Braig, Alex Kagan +1

Implications of a 2 - 5.5 GeV sbottom and 12 - 16 GeV gluino masses for rare B decay phenomenology are discussed. An effective Hamiltonian is constructed in which the gluinos are i…

cond-mat.stat-mech2001★ 116 cited

Universal Pulse Shape Scaling Function and Exponents: A Critical Test for Avalanche Models applied to Barkhausen Noise

Amit P. Mehta, Andrea C. Mills, Karin Dahmen +1

In order to test if the universal aspects of Barkhausen noise in magnetic materials can be predicted from recent variants of the non-equilibrium zero temperature Random Field Ising…

cond-mat.stat-mech2001★ 15.6k cited

Community structure in social and biological networks

Michelle Girvan, M. E. J. Newman

A number of recent studies have focused on the statistical properties of networked systems such as social networks and the World-Wide Web. Researchers have concentrated particularl…

astro-ph2001★ 20 cited

Search for high-frequency periodicities in time-tagged event data from gamma ray bursts and soft gamma repeaters

Adam T. Kruger, Thomas J. Loredo, Ira Wasserman

We analyze the Time-Tagged Event (TTE) data from observations of gamma ray bursts (GRBs) and soft gamma repeaters (SGRs) by the Burst and Transient Source Experiment (BATSE). These…

physics.flu-dyn2001★ 5 cited

Dynamics of immersed molecules in superfluids

Michael J. Quist, Veit Elser

The dynamics of a molecule immersed in a superfluid medium are considered. Results are derived using a classical hydrodynamic approach followed by canonical quantization. The class…

hep-th2001★ 7 cited

Strings in Ramond-Ramond backgrounds

Vatche Sahakian

We write the type IIB worldsheet action in classes of bosonic curved backgrounds threaded with Ramond-Ramond fluxes. The fixing of the kappa symmetry in the light-cone gauge and th…

hep-ex2001

Exploring the Charm Sector with CLEO-c

David Urner

The CLEO collaboration proposes to explore the charm sector starting early 2003. It is foreseen to collect on the order of 6 million D D-bar pairs, 300000 Ds Ds-bar pairs at thresh…

hep-ex2001★ 11 cited

Observation of Exclusive barB --> D(*) K*- Decays

R. Mahapatra, CLEO Collaboration

We report the first observation of the exclusive decays \bar B\to D^{(*)}K^{*-}, using 9.66 x 10^{6} B\bar{B} pairs collected at the Υ(4S) with the CLEO detector. We measure the fo…

hep-ex2001★ 35 cited

Search for CP Violation in τ-> Kπν_τDecays

G. Bonvicini, CLEO Collaboration

We search and find no evidence for CP violation in tau decays into the K pi nu final state. We provide confidence limits on the imaginary part of the coupling constant Lambda, desc…

hep-lat2001★ 36 cited

Perturbative expansions from Monte Carlo simulations at weak coupling: Wilson loops and the static-quark self-energy

H. D. Trottier, N. H. Shakespeare, G. P. Lepage +1

Perturbative coefficients for Wilson loops and the static-quark self-energy are extracted from Monte Carlo simulations at weak coupling. The lattice volumes and couplings are chose…

cond-mat.mes-hall2001★ 57 cited

Multi-phonon Raman scattering in semiconductor nanocrystals: importance of non-adiabatic transitions

E. P. Pokatilov, S. N. Klimin, V. M. Fomin +2

Multi-phonon Raman scattering in semiconductor nanocrystals is treated taking into account both adiabatic and non-adiabatic phonon-assisted optical transitions. Because phonons of…

hep-ex2001★ 3 cited

Measurement of the Xi^+_c Lifetime

CLEO Collaboration, A. H. Mahmood

The Xi^+_c lifetime is measured using 9.0 fb^-1 of e+e- annihilation data collected on and just below the Upsilon(4S) resonance with the CLEO II.V detector at CESR. This is the fir…

cond-mat.str-el2001★ 17 cited

Singular Structure and Enhanced Friedel Oscillations in the Two-Dimensional Electron Gas

I. G. Khalil, N. W. Ashcroft, M. Teter

We calculate the leading order corrections (in ) to the static polarization , with dynamically screened interactions, for the two-dimensional electron gas. The co…

math.NA2001★ 3 cited

Phase retrieval by iterated projections

Veit Elser

Several strategies in phase retrieval are unified by an iterative "difference map" constructed from a pair of elementary projections and a single real parameter . For the standa…

hep-ex2001★ 66 cited

Lifetime Differences, direct CP Violation and Partial Widths in D0 Meson Decays to K+K- and pi+pi-

S. E. Csorna, CLEO Collaboration

We describe several measurements using the decays D0->K+K- and pi+pi-. We find the ratio of partial widths, Gamma(D0->K+K-)/Gamma(D0->pi+pi-), to be 2.96+/-0.16+/-0.15, where the f…

math.QA2001

Infinitesimal Operations on Complexes of Graphs

Jim Conant, Karen Vogtmann

In two seminal papers Kontsevich used a construction called_graph homology_ as a bridge between certain infinite dimensional Lie algebras and various topological objects, including…

math.QA2001★ 3 cited

Cherednik algebras and differential operators on quasi-invariants

Yuri Berest, Pavel Etingof, Victor Ginzburg

We develop representation theory of the rational Cherednik algebra H associated to a finite Coxeter group W in a vector space h. It is applied to show that, for integral values of…