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Showing 2007Show all

35 papers · 1 filter

hep-th2007★ 35 cited

Universality of large N phase transitions in Wilson loop operators in two and three dimensions

R. Narayanan, H. Neuberger

The eigenvalue distribution of a Wilson loop operator of fixed shape undergoes a transition under scaling at infinite N. We derive a large N scaling function in a double scaling li…

hep-ex2007★ 29 cited

Beam spin asymmetry in deep and exclusive pi0 electroproduction

CLAS Collaboration, R. De Masi

The beam spin asymmetry (BSA) in the exclusive reaction ep->ep pi0 was measured with the CEBAF 5.77 GeV polarized electron beam and Large Acceptance Spectrometer(CLAS). The xB, Q2,…

nucl-ex2007★ 7 cited

Ratios of 15N/12C and 4He/12C inclusive electroproduction cross sections in the nucleon resonance region

CLAS Collaboration, P. E. Bosted, R. Fersch

The (W,Q2)-dependence of the ratio of inclusive electron scattering cross sections for 15N/12C was determined in the kinematic range 0.8<W<2 GeV and 0.2<Q2<1 GeV2 using 2.285 GeV e…

cond-mat.str-el2007★ 22 cited

Manifestations of Broken Symmetry: The Surface Phases of Ca(2-x)Sr(x)RuO4

R. G. Moore, V. B. Nascimento, Jiandi Zhang +4

The surface structural phases of Ca(2-x)Sr(x)RuO(4) are investigated using quantitative Low Energy Electron Diffraction. The broken symmetry at the surface enhances the structural…

hep-ex2007★ 194 cited

Deeply Virtual Compton Scattering Beam-Spin Asymmetries

F. X. Girod, R. A. Niyazov et al

The beam spin asymmetries in the hard exclusive electroproduction of photons on the proton (ep -> epg) were measured over a wide kinematic range and with high statistical accuracy.…

cond-mat.mtrl-sci2007★ 46 cited

Magnetocaloric effect in nano- and polycrystalline manganite

M. Pekala, V. Drozd, J. F. Fagnard +2

samples were prepared in nano- and polycrystalline forms by sol-gel and solid state reaction methods, respectively, and structurally characterized by synchr…

math.AC2007

Toroidalization of generating sequences in dimension two function fields of positive characteristic

Laura Ghezzi, Olga Kashcheyeva

We give a characteristic free proof of the main result of our previous paper (math.AC/0509697) concerning toroidalization of generating sequences of valuations in dimension two fun…

hep-lat2007

Universal properties of large N phase transitions in Wilson loops

R. Narayanan, H. Neuberger

Numerical studies support the conjecture that in continuum planar QCD the eigenvalue density of a Wilson loop operator undergoes a transition as the loop is dilated while keeping t…

cond-mat.mtrl-sci2007★ 8 cited

Influence of Zeeman splitting and thermally excited polaron states on magneto-electrical and magneto-thermal properties of magnetoresistive polycrystalline manganite La_{0.8}Sr_{0.2}MnO_3

S. Sergeenkov, J. Mucha, M. Pekala +2

Some possible connection between spin and charge degrees of freedom in magneto-resistive manganites is investigated through a thorough experimental study of the magnetic (AC suscep…

nucl-ex2007★ 63 cited

Cross sections and beam asymmetries for $\vev{e}p \to enπ^+$ in the nucleon resonance region for

K. Park, V. D. Burkert, W. Kim +1

The exclusive electroproduction process was measured in the range of the photon virtuality , and the invariant mass range…

hep-ph2007★ 20 cited

A Bayesian analysis of pentaquark signals from CLAS data

The CLAS Collaboration, D. G. Ireland

We examine the results of two measurements by the CLAS collaboration, one of which claimed evidence for a pentaquark, whilst the other found no such evidence. The unique fe…

hep-ph2007★ 57 cited

Transverse momentum dependence of semi-inclusive pion production

H. Mkrtchyan, P. E. Bosted, G. S. Adams +76

Cross sections for semi-inclusive electroproduction of charged pions () from both proton and deuteron targets were measured for , GeV, ,…

nucl-ex2007★ 152 cited

Deeply Virtual Compton Scattering off the neutron

M. Mazouz, A. Camsonne, C. Muñoz Camacho

The present experiment exploits the interference between the Deeply Virtual Compton Scattering (DVCS) and the Bethe-Heitler processes to extract the imaginary part of DVCS amplitud…

cond-mat.str-el2007★ 40 cited

Magnons in Ferromagnetic Metallic Manganites

Jiandi Zhang, F. Ye, Hao Sha +3

Ferromagnetic (FM) manganites, a group of likely half-metallic oxides, are of special interest not only because they are a testing ground of the classical doubleexchange interactio…

astro-ph2007★ 77 cited

The WEBT Campaign on the Blazar 3C279 in 2006

M. Boettcher

The quasar 3C279 was the target of an extensive multiwavelength monitoring campaign from January through April 2006, including an optical-IR-radio monitoring campaign by the Whole…

nucl-ex2007★ 11 cited

Quasifree Lambda, Sigma^0, and Sigma^- electroproduction from 1,2H, 3,4He, and carbon

F. Dohrmann, A. Ahmidouch, C. S. Armstrong +60

Kaon electroproduction from light nuclei and hydrogen, using 1H, 2H, 3He, 4He, and Carbon targets has been measured at Jefferson Laboratory. The quasifree angular distributions of…

nucl-ex2007★ 76 cited

Search for medium modification of the meson

R. Nasseripour, M. H. Wood, C. Djalali +5

The photoproduction of vector mesons on various nuclei has been studied using the CEBAF Large Acceptance Spectrometer (CLAS) at Jefferson Laboratory. The vector mesons, , , a…

nucl-ex2007★ 89 cited

Scaling study of the pion electroproduction cross sections and the pion form factor

T. Horn

The H()n cross section was measured for a range of four-momentum transfer up to =3.91 GeV at values of the invariant mass, , above the resonance r…

physics.optics2007★ 113 cited

Vacuum Rabi splitting and intracavity dark state in a cavity-atoms system

Gessler Hernandez, Jiepeng Zhang, Yifu Zhu

We report experimental measurements of the transmission spectrum of an optical cavity coupled with cold Rb atoms. We observe the multi-atom vacuum Rabi splitting of a composite cav…

physics.gen-ph2007★ 9 cited

Semi-empirical pressure-volume-temperature equation of state; MgSiO3 perovskite is an example

Jozsef Garai

Simple general formula describing the p-V-T relationships of elastic solids is derived from theoretical considerations. The new EoS was tested to experiments of perovskite 0-109 GP…

nucl-ex2007★ 48 cited

The Proton Elastic Form Factor Ratio at Low Momentum Transfer

G. Ron, J. Glister, B. Lee

High precision measurements of the proton elastic form factor ratio have been made at four-momentum transfers, Q^2, between 0.2 and 0.5 GeV^2. The new data, while consistent with p…

hep-ex2007★ 86 cited

photoproduction on the proton for photon energies from 0.675 to 2.875 GeV

M. Dugger, B. G. Ritchie, J. P. Ball +7

Differential cross sections for the reaction have been measured with the CEBAF Large Acceptance Spectrometer (CLAS) and a tagged photon beam with energies from 0.675…

nucl-ex2007★ 64 cited

High Resolution Spectroscopy of 12B_Lambda by Electroproduction

M. Iodice, F. Cusanno, A. Acha +96

An experiment measuring electroproduction of hypernuclei has been performed in Hall A at Jefferson Lab on a C target. In order to increase counting rates and provide unambig…

hep-lat2007★ 19 cited

Phases of three dimensional large N QCD on a continuum torus

R. Narayanan, H. Neuberger, F. Reynoso

It is established by numerical means that continuum large N QCD defined on a three dimensional torus can exist in four different phases. They are (i) confined phase; (ii) deconfine…