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High Energy Physics - Lattice papers — page 254

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Monte Carlo studies of dynamical compactification of extra dimensions in a model of nonperturbative string theory
The IIB matrix model has been proposed as a non-perturbative definition of superstring theory. In this work, we study the Euclidean version of this model in which extra dimensions can be dynamically…
Konstantinos N. Anagnostopoulos, Takehiro Azuma, Jun NishimuraSep 16, 2015
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Stochastic method with low mode substitution for nucleon isovector matrix elements
We introduce a stochastic sandwich method with low-mode substitution to evaluate the connected three-point functions. The isovector matrix elements of the nucleon for the axial-vector coupling…
Yi-Bo Yang, Andrei Alexandru, Terrence Draper et al.Sep 15, 2015
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Reweighting twisted boundary conditions
Imposing twisted boundary conditions on the fermionic fields is a procedure extensively used when evaluating, for example, form factors on the lattice. Twisting is usually performed for one flavour…
Andrea Bussone, Michele Della Morte, Martin Hansen et al.Sep 15, 2015
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Canonical Transformations and Loop Formulation of SU(N) Lattice Gauge Theories
We construct canonical transformations to reformulate SU(N) Kogut-Susskind lattice gauge theory in terms of a set of fundamental loop & string flux operators along with their canonically conjugate…
Manu Mathur, T. P. SreerajSep 14, 2015
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Topological charge using cooling and the gradient flow
The equivalence of cooling to the gradient flow when the cooling step nc and the continuous flow step of gradient flow τ are matched is generalized to gauge actions that include rectangular…
Constantia Alexandrou, Andreas Athenodorou, Karl JansenSep 14, 2015
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Finite Volume and Partially Quenched QCD-like Effective Field Theories
We present a calculation of the meson masses, decay constants and quark-antiquark vacuum expectation value for the three generic QCD-like chiral symmetry breaking patterns $SU(NF)× SU(NF)…
Johan Bijnens, Thomas RösslerSep 14, 2015
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In-medium heavy-quarkonium from lattice QCD spectral functions
We discuss recent progress in the study of in-medium heavy quarkonium using first-principles lattice QCD calculations and effective field theory. In particular our focus lies on real-time information…
Alexander RothkopfSep 12, 2015
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Non-Perturbative Gauge-Higgs Unification in Five Dimensions
We study the phase diagram and mass spectrum of an SU(2) Gauge-Higgs Unification scenario on a five-dimensional orbifold.We observe spontaneous symmetry breaking within the Higgs phase of the…
Graham Moir, Maurizio Alberti, Francesco Knechtli et al.Sep 11, 2015
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Charm and bottom quark masses on the lattice
Lattice determinations of quark mass have made significant progress in the last few years. I will review recent advances in calculations of charm and bottom mass, which are near to achieving…
Andrew T. LytleSep 10, 2015
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Phase Diagram of Dynamical Twisted Mass Wilson Fermions at Finite Isospin Chemical Potential
We consider the phase diagram of twisted mass Wilson fermions of two-flavor QCD in the parameter space of the quark mass, the isospin chemical potential, the twist angle and the lattice spacing. This…
Oliver Janssen, Mario Kieburg, K. Splittorff et al.Sep 9, 2015
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Lattice QCD and Axion Cosmology
The Strong CP Problem can be resolved by introducing an additional global symmetry known as Peccei-Quinn symmetry. Once PQ symmetry is broken the associated particle, the QCD axion, is a plausible…
Evan BerkowitzSep 9, 2015
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Masses of D mesons, Ds mesons and charmonium states from twisted mass lattice QCD
We compute masses of D mesons, Ds mesons and charmonium states using Wilson twisted mass lattice QCD. We present results for spin J = 0,1,2,3, parity P = -,+ and in case of…
Martin Kalinowski, Marc WagnerSep 8, 2015
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Ground state charmed meson spectra for Nf=2+1+1
We present a preliminary study of the charmed meson spectra using the electrically neutral subset of the new Budapest-Marseille-Wuppertal Nf=2+1+1 gauge configurations that utilise the 3-HEX smeared…
T. D. Rae, S. DurrSep 8, 2015
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About Monopoles in QCD
The hypothesis is analysed that the monopoles condensing in QCD vacuum to make it a dual superconductor are classical solutions of the equations of motion.
Adriano Di GiacomoSep 8, 2015
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Nf = 1 QCD in External Magnetic Fields: Staggered Fermions
We investigate Nf = 1 QCD in external magnetic fields on the lattice. The background field is introduced by means of the so-called Schrodinger functional. We adopt standard staggered fermions with…
Paolo Cea, Leonardo CosmaiSep 7, 2015
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Canonical simulations of supersymmetric SU(N) Yang-Mills quantum mechanics
The fermion loop formulation naturally separates partition functions into their canonical sectors. Here we discuss various strategies to make use of this for supersymmetric SU(N) Yang-Mills quantum…
Georg Bergner, Hang Liu, Urs WengerSep 4, 2015
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η meson mass from topological charge density correlator in QCD
The flavor-singlet component of the eta prime meson is related to the topological structure of the SU(3) gauge field through the chiral anomaly. We perform a 2+1-flavor lattice QCD calculation and…
JLQCD collaboration, H. Fukaya, S. Aoki et al.Sep 3, 2015
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FLAG: Lattice QCD Tests of the Standard Model and Foretaste for Beyond
After a short presentation of the FLAG collaboration, we review lattice results related to pion, K-, D- and B-meson physics with the aim of making them easily accessible to the particle-physics…
Anastassios VladikasSep 3, 2015
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QED effects in the pseudoscalar meson sector
We present results on the pseudoscalar meson masses from a fully dynamical simulation of QCD+QED. We concentrate particularly on violations of isospin symmetry. We calculate the π+-π0 splitting…
R. Horsley, Y. Nakamura, H. Perlt et al.Sep 2, 2015
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Kaon BSM B-parameters using improved staggered fermions from Nf=2+1 unquenched QCD
We present results for the matrix elements of the additional ΔS=2 operators that appear in models of physics beyond the Standard Model (BSM), expressed in terms of four BSM B-parameters. Combined…
Benjamin J. Choi, Yong-Chull Jang, Chulwoo Jung et al.Sep 2, 2015
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Confinement and string breaking for QED2 in the Hamiltonian picture
The formalism of matrix product states is used to perform a numerical study of 1+1 dimensional QED -- also known as the (massive) Schwinger model -- in the presence of an external static `quark'…
Boye Buyens, Jutho Haegeman, Henri Verschelde et al.Sep 1, 2015
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Renormalization functions for Nf=2 and Nf=4 Twisted Mass fermions
We present results on the renormalization functions of the quark field and fermion bilinears with up to one covariant derivative. For the fermion part of the action we employ the twisted mass…
Constantia Alexandrou, Martha Constantinou, Haralambos PanagopoulosSep 1, 2015
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Center Vortices, Area Law and the Catenary Solution
We present meson-meson (Wilson loop) correlators in Z(2) center vortex models for the infrared sector of Yang-Mills theory, i.e., a hypercubic lattice model of random vortex surfaces and a continuous…
Roman Höllwieser, Derar AltarawnehSep 1, 2015
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Two-Flavor Lattice QCD with a Finite Density of Heavy Quarks: Heavy-Dense Limit and "Particle-Hole" Symmetry
We investigate the properties of the half-filling point in lattice QCD (LQCD), in particular the disappearance of the sign problem and the emergence of an apparent particle-hole symmetry, and try to…
Tobias Rindlisbacher, Philippe de ForcrandAug 31, 2015
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Higgs-Yukawa model with higher dimension operators via extended mean field theory
Using extended mean field theory (EMFT) on the lattice, we study properties of the Higgs-Yukawa model as an approximation of the standard model Higgs sector, and the effect of higher dimension…
Oscar Akerlund, Philippe de ForcrandAug 31, 2015
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