Showing 2004Show all

310 papers · 1 filter

hep-ex2004★ 44 cited

Measurement of Branching Fractions and Charge Asymmetries for Exclusive B Decays to Charmonium

B. Aubert, BABAR Collaboration

We report measurements of branching fractions and charge asymmetries of exclusive decays of neutral and charged B mesons into two-body final states containing a charmonium state an…

cond-mat.dis-nn2004

Quantum Magnets with Anisotropic Infinite Range Random Interactions

Liliana Arrachea, Marcelo J. Rozenberg

Using exact diagonalization techniques we study the dynamical response of the anisotropic disordered Heisenberg model for systems of S=1/2 spins with infinite range random exchange…

cond-mat.stat-mech2004★ 30 cited

Energy flux distribution in a two-temperature Ising model

Vivien Lecomte, Zoltan Racz, Frederic van Wijland

The nonequilibrium steady state of an infinite-range Ising model is studied. The steady state is obtained by dividing the spins into two groups and attaching them to two heat baths…

cond-mat.mtrl-sci2004★ 44 cited

Diffusion rates of Cu adatoms on Cu(111) in the presence of an adisland nucleated at FCC or HCP sites

Mihai-Cosmin Marinica, Cyrille Barreteau, Daniel Spanjaard +1

The surface diffusion of Cu adatoms in the presence of an adisland at FCC or HCP sites on Cu(111) is studied using the EAM potential derived by Mishin {\it et al.} [Phys. Rev. B {\…

hep-th2004★ 26 cited

Integrability in Yang-Mills theory on the light cone beyond leading order

A. V. Belitsky, G. P. Korchemsky, D. Müller

The one-loop dilatation operator in Yang-Mills theory possesses a hidden integrability symmetry in the sector of maximal helicity Wilson operators. We calculate two-loop correction…

cond-mat.str-el2004★ 10 cited

The Hubbard model at half-filling, part III: the lower bound on the self-energy

Stephane Afchain, Jacques Magnen, Vincent Rivasseau

We complete the proof that the two-dimensional Hubbard model at half-filling is not a Fermi liquid in the mathematically precise sense of Salmhofer, by establishing a lower bound o…

math.GR2004★ 8 cited

Sur les automorphismes et la rigidite des groupes de Coxeter a angles droits

Anatole Castella

By underlying the commutation relation in a right-angled Coxeter group W, we recover the fact that right-angled Coxeter groups are rigid and we describe the second subgroup of Aut(…

hep-ph2004★ 10 cited

Prospects of mass measurements for neutral MSSM Higgs bosons in the intense-coupling regime at a Linear Collider

E. Boos, V. Bunichev, A. Djouadi +1

We analyze the prospects for detecting the three neutral Higgs bosons of the Minimal Supersymmetric extension of the Standard Model in the intense-coupling regime at e+e- colliders…

physics.ins-det2004★ 9 cited

First tests of a Micromegas TPC in a magnetic field

P. Colas, I. Giomataris, V. Lepeltier +1

Since the summer of 2003, a large Micromegas TPC prototype (1000 channels, 50 cm drift, 50 cm diameter) has been operated in a 2T superconducting magnet at Saclay. A description of…

physics.ins-det2004★ 44 cited

Ion backflow in the Micromegas TPC for the future linear collider

P. Colas, I. Giomataris, V. Lepeltier

We present ion backflow measurements in a Micromegas (MICRO-MEsh GASeous detector) TPC device developed for the next high energy electron-positron linear collider under study and a…

astro-ph2004★ 494 cited

IRIS: A new generation of IRAS maps

Marc-Antoine Miville-Deschenes, Guilaine Lagache

The Infrared Astronomical Satellite (IRAS) had a tremendous impact on many areas of modern astrophysics. In particular it revealed the ubiquity of infrared cirrus that are a specta…

astro-ph2004★ 8 cited

Radiodetection of Cosmic Ray Extensive Air Showers

D. Ardouin, A. Belletoile, D. Charrier +12

We present the characteristics and performance of a demonstration experiment devoted to the observation of ultra high- energy cosmic ray extensive air showers using a radiodetectio…

hep-th2004★ 8 cited

Linearized Israel Matching Conditions for Cosmological Perturbations in a Moving Brane Background

Martin Bucher, Carla Carvalho

With a view toward the problem of computing the linearized cosmological perturbations in Randall-Sundrum cosmological models where a Z2 symmetry has been imposed about a boundary b…

cond-mat.other2004★ 53 cited

On the diffraction pattern of C60 peapods

Julien Cambedouzou, Vincent Pichot, Stephane Rols +5

We present detailed calculations of the diffraction pattern of a powder of bundles of C peapods. The influence of all pertinent structural parameters of the bundles on the d…

cond-mat.soft2004★ 11 cited

Effective interactions in the colloidal suspensions from HNC theory

Daniel Leger, Dominique Levesque

The HNC Ornstein-Zernike integral equations are used to determine the properties of simple models of colloidal solutions where the colloids and ions are immersed in a solvent consi…

astro-ph2004★ 110 cited

Photodisintegration of Ultra-High-Energy Cosmic Rays revisited

E. Khan, S. Goriely, D. Allard +5

Recent microscopic and phenomenological calculations of giant dipole resonances for A <= 56 nuclei are presented. The derived photodisintegration cross sections are exhaustively co…

hep-ex2004★ 16 cited

Search for neutrinoless double beta decay with the NEMO-3 detector: first results

Xavier Sarazin

The NEMO-3 detector, which has been operating in the Frejus Underground Laboratory since February 2003, is devoted to searching for neutrinoless double beta decay (ββ0 ν). The expe…

cond-mat.stat-mech2004★ 61 cited

Granular gases: dynamics and collective effects

Alain Barrat, Emmanuel Trizac, Matthieu H. Ernst

We present a biased review of some of the most "spectacular" effects appearing in the dynamics of granular gases where the dissipative nature of the collisions leads to a rich phen…

cs.NI2004★ 125 cited

Exploring networks with traceroute-like probes: theory and simulations

Luca Dall'Asta, Ignacio Alvarez-Hamelin, Alain Barrat +2

Mapping the Internet generally consists in sampling the network from a limited set of sources by using traceroute-like probes. This methodology, akin to the merging of different sp…

math.AP2004

The Kato square root problem for mixed boundary value problems

Andreas Axelsson, Stephen Keith, Alan McIntosh

We solve the Kato square root problem for second order elliptic systems in divergence form under mixed boundary conditions on Lipschitz domains. This answers a question posed by J.…

hep-th2004★ 33 cited

A Calculable Toy Model of the Landscape

Keith R. Dienes, Emilian Dudas, Tony Gherghetta

Motivated by recent discussions of the string-theory landscape, we propose field-theoretic realizations of models with large numbers of vacua. These models contain multiple U(1) ga…

hep-ph2004

Relevance of the strange quark sector in chiral perturbation theory

H. Sazdjian

Results obtained in recent years in the strange quark sector of chiral perturbation theory are reviewed and the theoretical relevance of this sector for probing the phase structure…

hep-ph2004★ 27 cited

Exotic hybrid mesons in hard electroproduction

I. V. Anikin, B. Pire, L. Szymanowski +2

We estimate the sizeable cross section for deep exclusive electroproduction of an exotic hybrid meson in the Bjorken regime. The production amplitude scales like th…

hep-lat2004★ 23 cited

An exploratory lattice study of DI=3/2 K -> pi pi decays at next-to-leading order in the chiral expansion

P. Boucaud, V. Gimenez, C-J. D. Lin +4

We present the first direct evaluation of DI = 3/2 K -> pi pi matrix elements with the aim of determining all the low-energy constants at NLO in the chiral expansion. Our numerical…