Showing papers in "Nuclear Physics in 2008"

TL;DR: In this paper, the chiral magnetic effect is proposed to separate charge in the presence of a background magnetic field, and the effect is observed experimentally in the case of heavy ion collisions.

TL;DR: In this paper, it was shown that all the momentum integrals appearing in the perturbative on-shell calculations up to four loops are dual to true conformal integrals, well defined off shell.

TL;DR: In this article, the authors extend the definition of the flipped loop-quantum gravity vertex to the case of a finite Immirzi parameter γ, and show that the resulting dynamics is defined on a Hilbert space isomorphic to the one of loop quantum gravity.

TL;DR: For one-loop MHV amplitudes with an arbitrary number of external legs this universal function can be derived using Wilson loops as mentioned in this paper, which is in precise agreement with the known expression for the infinite sequence of MHV amplitude in N = 4 super-Yang-Mills.

TL;DR: Ryu et al. as discussed by the authors investigated the entanglement entropy in gravity duals of confining large N c gauge theories using the proposal of [S. Ryu, T. Takayanagi, JHEP 0608 (2006) 045, hep-th/0605073 ].

TL;DR: In this paper, an explicit two-loop calculation of the Wilson loop dual to the four-gluon scattering amplitude was performed and it was shown that the relation holds beyond one loop.

TL;DR: In this article, general expressions for the oblique parameters S, T, U, V, W, and X in the SU(2)×U(1) electroweak model with an arbitrary number of scalar SU( 2) doublets, with hypercharge ± 1/2, and an arbitrary scalar singlets.

TL;DR: In this paper, the nuclear matrix elements (NME) of the neutrinoless double beta decays were analyzed in the framework of the interacting shell model and the relative value of different contributions to the NME's, such as higher order terms in the nuclear current, finite nuclear size effects and short range correlations, were discussed.

TL;DR: In this paper, the consequences of long range rapidity correlations in the Glasma were investigated and it was shown that these correlations reproduce many of the features of the recently observed ridge events in heavy ion collisions at RHIC.

TL;DR: In this article, it is shown that the de Sitter space does not belong to this class and is unstable under small perturbations which may cause a breakdown of the deSitter symmetry.

TL;DR: In this article, a vertex amplitude for 4d loop quantum gravity was derived from a conventional quantization of a Regge discretization of euclidean general relativity, which yields a spinfoam sum that corrects some difficulties of the Barrett-Crane theory.

TL;DR: In this paper, the authors investigated the behavior of a pair of heavy quarks, denoted by Q and Q ¯, in a hot/dense medium, and derived a Schrodinger equation for the correlator of the heavy fermions; the interaction effects exponentiate, leading to a simple instantaneous effective potential for this equation.

TL;DR: In this paper, a number of improvements to the previous AKK extraction of fragmentation functions for π ±, K ±, p / p ¯, K S 0 and Λ / Λ ¯ particles at next-to-leading order are performed.

TL;DR: Using the gauge-string duality, the authors compute two-point functions of the force acting on an external quark moving through a finite temperature bath of N = 4 super-Yang-Mills theory.

TL;DR: In this article, the authors present a systematic way to solve the right-handed quark mixing matrix analytically in this model and find that the leading order solution has the same hierarchical structure as the left-handed CKM matrix with one more CP-violating phase coming from the complex Higgs vev.

TL;DR: In this article, the Pohlmeyer-reduced version of the corresponding sigma model is constructed and the reduced model has world-sheet supersymmetry and is ultraviolet-finite.

TL;DR: In this paper, the authors present a cross section for inclusive Higgs production in gluon-gluon fusion in perturbative QCD to all orders in the limit of high partonic center-of-mass energy.

TL;DR: In this paper, the energy spectra of the fluxes of positrons, anti-protons and photons generated by Dark Matter annihilations in our galaxy, as univocally predicted by the model of Minimal Dark Matter, were presented.

TL;DR: In this article, the holographic representation of the entanglement entropy of four-dimensional conformal field theories is studied and the anomalous terms in the entropy are evaluated by generalizing the replica trick.

TL;DR: In this paper, the authors elaborate the production of single heavy-flavored hadrons in e + e − annihilation at next-to-leading order in the general-mass variable-flavor-number scheme.

TL;DR: In this paper, four different level density models, three phenomenological and one microscopic, are consistently parameterized using the same set of experimental observables, for each nuclide for which sufficient experimental data exists, a local level density parameterization is constructed for each model.

TL;DR: In this paper, the eigenvalues of the family of Baxter Q-operators for supersymmetric integrable spin chains constructed with the g l ( K | M ) -invariant R-matrix obey the Hirota bilinear difference equation.

TL;DR: In this article, the equivalence between the closed-string and the open-string origins of f(λ) was shown to be a non-trivial relation between the anomalous dimension and the light-like Wilson loop interpretation.

TL;DR: In this article, the authors considered form factors of integrable quantum field theories in finite volume, and extended their investigation to matrix elements with disconnected pieces, and gave a new method for generating a low temperature expansion, which they test for the one point function up to third order.

TL;DR: In this article, a quantitative evaluation of dilepton sources in heavy-ion reactions is performed taking into account both thermal and non-thermal production mechanisms, and a convolution of the emission rates over a thermal fireball expansion results in good agreement with experiment in the low-mass spectra, confirming the predicted broadening of the ρ meson in hadronic matter in connection with the prevalence of baryon induced medium effects.

TL;DR: In this article, it was shown that the previously found disagreement for η / s at finite 't Hooft coupling is resolved once the incoming-wave boundary condition for metric fluctuations at the horizon of the dual geometry is properly imposed.

TL;DR: In this article, a functional method in the theory of exactly solvable models based on the Yang-Baxter algebra was proposed, and the eigenvalues of the XXZ model with non-diagonal twisted and open boundary conditions for general values of the anisotropy and boundary parameters were derived.

TL;DR: The role of hypernuclear physics for the physics of neutron stars is delineated in this paper, where hypernuclear potentials in dense matter control the hyperon composition of dense neutron star matter.

TL;DR: In this article, a MEC Ramon y Cajal contract, MEC project FPA2006-05294 and Junta de Andalucia projects FQM 101 and FQN 437 were supported by the MEC.

TL;DR: In this article, the volume dependence of matrix elements of local fields to all orders in inverse powers of the volume (i.e., only neglecting contributions that decay exponentially with volume) is described.