Showing papers in "Physics Letters B in 2011"

TL;DR: In this paper, the first two years of data from the Fermi Gamma Ray Space Telescope from the direction of the inner 10° around the Galactic Center with the intention of constraining, or finding evidence of, annihilating dark matter was analyzed.

TL;DR: In this article, the authors measured the transverse momentum spectra of primary charged particles in Pb-Pb collisions at root s(NN) = 2.76 TeV at the ALICE Collaboration at the LHC.

TL;DR: In this article, a search for squarks and gluinos in final states containing jets, missing transverse momentum and no electrons or muons is presented, and the data were recorded by the ATLAS experiment in sqrt(s) = 7 TeV proton-proton collisions at the Large Hadron Collider.

TL;DR: In this paper, the authors explore model-independent collider constraints on light Majorana dark matter particles and find that colliders provide a complementary probe of WIMPs to direct detection.

TL;DR: In this article, the K-series x rays of kaonic hydrogen atoms at the DANE electron-positron collider of Laboratori Nazionali di Frascati, and have de-termined the most precise values of the strong-interaction energy-level shift and width of the 1s atomic state.

TL;DR: In this article, an analysis of the production of light nuclei, hypernuclei, and their antiparticles in central collisions of heavy nuclei is presented, using the statistical model.

TL;DR: In this paper, a canonical scalar field is added to the standard quintessence model, allowing for a non-minimal coupling with gravity, which exhibits a richer structure.

TL;DR: In this paper, the authors consider isospin-violating dark matter (IVDM) with one extra parameter, the ratio of neutron to proton couplings, and include the isotope distribution for each detector, and provide a quarklevel realization of IVDM as WIMPless dark matter that is consistent with all collider and low energy bounds.

TL;DR: In this paper, the effects of scalar density perturbations in the presence of non-relativistic matter minimally coupled to gravity were derived under a quasi-static approximation on sub-horizon scales.

TL;DR: This derivation is the first pure field theory proof of the new discovered BCJ identity, which substantially reduces the color-ordered basis from ( n − 2 ) ! to (n − 3 ) ! .

TL;DR: In this paper, the authors show that the key features of the CMS result on the ridge correlation seen for high multiplicity events in p s = 7 TeV proton-proton collisions at the LHC can be understood in the Color Glass Condensate framework of high energy QCD.

TL;DR: In this paper, the first four moments of baryon number, electric charge and strangeness fluctuations within the hadron resonance gas model were calculated and compared with the first data on net proton fluctuations in Au-Au collisions obtained at RHIC by the STAR Collaboration.

TL;DR: The EDELWEISS-II Collaboration has completed a direct search for WIMP dark matter with an array of ten 400-g cryogenic germanium detectors in operation at the Laboratoire Souterrain de Modane as discussed by the authors.

TL;DR: In this article, a joint analysis with measurements of the most recent type Ia supernovae (SNe Ia), Baryon Acoustic Oscillation (BAO), Cosmic Microwave Background radiation (CMB), Gamma-Ray Bursts data (GRBs), and Hubble parameter observations (OHD) is performed to compare the information coming from different observational data sets in the context of a sort of f (T ) theories.

TL;DR: In this article, the vierbein (tetrad) fields for closed and open Friedmann-Robertson-Walker cosmologies have been analyzed for a family of modified gravity theories based on absolute parallelism, and it is shown that the autoparallel frames satisfying the field equations are evasive to a priori physical understanding.

TL;DR: The first measurement of two-pion Bose-Einstein correlations in central Pb-Pb collisions at root(NN)-N-S = 2.76 TeV at the Large Hadron Collider is presented in this article.

TL;DR: In this article, the authors proposed an alternative interpretation which takes into account the entropy and temperature intrinsic to the horizon of the universe due to the information holographically stored there, and showed that this leads to the entropic accelerating universe.

TL;DR: In this article, a simple extension of the Standard Model Higgs inflation with one new real scalar field which preserves unitarity up to the Planck scale was considered, and both the Higgs field and the sigma field participated in the inflationary dynamics, following the flat direction of the potential.

TL;DR: In this paper, the authors reanalyze the Fermi data and find that it is consistent with the "standard model" of diffuse emission and of known point sources, and the main reason for the discrepancy with the interpretation of Hooper and Goodenough (2010) is different (as compared to the previous works) spectrum of the point source at the Galactic Center assumed by Hooper this paper.

TL;DR: In this paper, a general scheme of reducing 4d superconformal indices to 3D partition functions was described, which imply an efficient way of getting 3d N = 2 supersymmetric dualities for both SYM and CS theories from the “parent” 4D N = 1 duality for SYM theories.

TL;DR: In this paper, an effective field theory with explicit Lorentz violation is constructed from a 1-form coefficient and has a Finsler structure complementary to the Randers structure.

TL;DR: In this paper, infinite families of multi-indexed orthogonal polynomials are discovered as the solutions of exactly solvable one-dimensional quantum mechanical systems, where each polynomial has another integer n which counts the nodes and the totality of the integer indices correspond to the degrees of the virtual state wavefunctions which are deleted by the generalisation of Crum-Adler theorem.

TL;DR: In this article, the U-duality group SO(5,5) acts in five spatial dimensions and is reformulated as an object that unifies the three-form and the metric and makes the M-theory duality group manifest.

TL;DR: In this article, a search for supersymmetry with R-parity conservation in proton-proton collisions at a centre-of-mass energy of 7 TeV is presented.

TL;DR: In this paper, the authors put the discussion in more realistic model keeping all components of the QCD vector ghost and showed that indeed QCD ghost produces dark energy proportional to the Hubble parameter H Λ QCD 3 (λ QCD), which has the right magnitude ∼ ( 3 × 10 − 3 eV ) 4.

TL;DR: In this paper, the Polyakov-extended quark-meson model (PQM) was investigated beyond mean-field, which represents an important step towards a fully dynamical QCD computation.

TL;DR: In this article, the authors re-analyze published proton beam dump data taken at the U70 accelerator at IHEP Serpukhov with the ν-calorimeter I experiment in 1989 to set mass-coupling limits for dark gauge forces.

TL;DR: In this paper, the authors study the Higgs portal from the Standard-Model to a hidden sector and examine which elements of the extended theory can be discovered and explored at the LHC.

TL;DR: In this paper, the transverse-momentum distribution of Drell-Yan lepton pairs produced in hadron collisions is considered and the logarithmically-enhanced perturbative QCD contributions up to next-to-next-toleading (Q2L) logrithmic accuracy is obtained.

TL;DR: In this article, the authors derived the gravity field equations by varying the action for an ultraviolet complete quantum gravity and determined an exact black hole solution for the case of a static source term and found a regular spacetime geometry: in place of the conventional curvature singularity extreme energy fluctuations of the gravitational field at small length scales provide an effective cosmological constant in a region locally described in terms of a de Sitter space.