Physical sciences topic list of research papers
-
Inclusive heavy flavor hadroproduction in NLO QCD: The exact analytic result
Abstract We present the first exact analytic result for all partonic channels contributing to the total cross section for the production of a pair of heavy flavors in hadronic collisions in NLO QCD. Our calculation is a step in the derivation of the ...
2009 / M. Czakon, A. Mitov -
Flipped spinfoam vertex and loop gravity
Abstract We introduce a vertex amplitude for 4d loop quantum gravity. We derive it from a conventional quantization of a Regge discretization of euclidean general relativity. This yields a spinfoam sum that corrects some difficulties of the...
2008 / Jonathan Engle, Roberto Pereira, Carlo Rovelli -
Finite-size effects for dyonic giant magnons
Abstract We compute finite-size corrections to dyonic giant magnons in two ways. One is by examining the asymptotic behavior of helical strings of [K. Okamura, R. Suzuki, A perspective on classical strings from complex sine-Gordon solitons, Phys....
2008 / Yasuyuki Hatsuda, Ryo Suzuki -
Electroweak and supersymmetric two-loop corrections to lepton anomalous magnetic and electric dipole moments
Abstract Using the effective Lagrangian method, we analyze the electroweak corrections to the anomalous dipole moments of lepton from some special two-loop diagrams where a closed neutralino/chargino loop is inserted into relevant two Higgs doublet...
2008 / Tai-Fu Feng, Lin Sun, Xiu-Yi Yang -
Four-nucleon system with Δ-isobar excitation
Abstract The four-nucleon bound state and scattering below three-body breakup threshold are described based on the realistic coupled-channel potential CD Bonn + Δ ...
2008 / A. Deltuva, A.C. Fonseca, P.U. Sauer -
Remarks on methods for the computation of boundary-element integrals by co-ordinate transformation2005 / J. Sanz-Serna, M. Doblare, E. Alarcon
-
A simple description of jet cross-section ratios
Abstract We compute the ratio of the inclusive jet cross-sections obtained with the same jet algorithm at two different values of the jet radius. We perform a computation of that observable at NLO ( O ...
2011 / Gregory Soyez -
Geometry of the quantum universe
Abstract A quantum universe with the global shape of a (Euclidean) de Sitter spacetime appears as dynamically generated background geometry in the causal dynamical triangulation (CDT) regularisation of quantum gravity. We investigate the micro- and...
2010 / J. Ambjørn, A. Görlich, J. Jurkiewicz, R. Loll -
Distinguishing between dark matter and pulsar origins of the ATIC electron spectrum with atmospheric Cherenkov telescopes
Abstract Recent results from the Advanced Thin Ionization Calorimeter (ATIC) balloon experiment have identified the presence of a spectral feature between approximately 300 and 800 GeV in the cosmic ray electron spectrum. This spectral feature...
2009 / Jeter Hall, Dan Hooper -
An alternative for moduli stabilisation
Abstract The one-loop vacuum energy is explicitly computed for a class of perturbative string vacua where supersymmetry is spontaneously broken by a T-duality invariant asymmetric Scherk–Schwarz deformation. The low-lying spectrum is tachyon-free...
2006 / Carlo Angelantonj, Matteo Cardella, Nikos Irges -
Twist-deformed supersymmetries in non-anticommutative superspaces
Abstract We consider a quantum group interpretation of the non-anticommutative deformations in Euclidean supersymmetric theories. Twist deformations in the corresponding superspaces and supergroups are constructed in terms of the left supersymmetry...
2005 / B.M. Zupnik -
Anti-screening by quarks and the structure of the inter-quark potential
Abstract The inter-quark potential is dominated by anti-screening effects which underly asymptotic freedom. We calculate the order g 6 ...
2005 / Emili Bagan, Martin Lavelle, David McMullan -
Gauge invariance, causality and gluonic poles
Abstract We explore the electromagnetic gauge invariance of the hadron tensor of the Drell–Yan process with one transversely polarized hadron. The special role is played by the contour gauge for gluon fields. The prescription for the gluonic pole in ...
2010 / I.V. Anikin, O.V. Teryaev -
The heavy-quark potential in an anisotropic plasma
Abstract We determine the hard-loop resummed propagator in an anisotropic QCD plasma in general covariant gauges and define a potential between heavy quarks from the Fourier transform of its static limit. We find that there is stronger attraction on ...
2008 / Adrian Dumitru, Yun Guo, Michael Strickland -
Resonance decay effects on anisotropy parameters
Abstract We present the elliptic flow v 2 of pions produced from resonance decays. The transverse momentum ...
2004 / X. Dong, S. Esumi, P. Sorensen, N. Xu, Z. Xu -
Insight into double-pomeron-exchange Higgs production and backgrounds
Abstract We quantify the central inclusive background contributions to exclusive Higgs production at the LHC arising from double-pomeron-exchange processes. We consider the H → ...
2007 / V.A. Khoze, A.D. Martin, M.G. Ryskin -
Crossing symmetry and phenomenological widths in effective Lagrangian models of the pion photoproduction process
Abstract We investigate the importance of crossing symmetry in effective field models and the effects of phenomenological nucleon resonance widths on the paradigmatic case of pion photoproduction. We use reaction models containing four star...
2008 / C. Fernández-Ramírez, E. Moya de Guerra, J.M. Udías -
Box compactification and supersymmetry breaking
Abstract We discuss all possible compactifications on flat three-dimensional spaces. In particular, various fields are studied on a box with opposite sides identified, after two of them are rotated by π, and their spectra are obtained. The...
2004 / A. Kehagias, K. Tamvakis -
Vertex ring-indexed Lie algebras
Abstract Infinite-dimensional Lie algebras are introduced, which are only partially graded, and are specified by indices lying on cyclotomic rings. They may be thought of as generalizations of the Onsager algebra, but unlike it, or its ...
2005 / David Fairlie, Cosmas Zachos -
T-duality, quotients and generalized Kähler geometry
Abstract We reopen the discussion of gauging two-dimensional off-shell ( 2 , 2 ) supersymmetric sigma...
2008 / Willie Merrell, Diana Vaman