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High Energy Physics - Lattice papers — page 256

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Computation of correlation matrices for tetraquark candidates with JP = 0+ and flavor structure q1 q2 q3 q3
The conjecture that several recently observed mesons have a structure, which is not dominated by an ordinary quark-antiquark pair, but by a four-quark structure, is being actively investigated both…
Joshua Berlin, Abdou Abdel-Rehim, Constantia Alexandrou et al.Aug 19, 2015
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An improvement in complex Langevin dynamics from a view point of Lefschetz thimbles
We develop a way of improving complex Langevin dynamics motivated by the Lefschetz-thimble decomposition of integrals. In our method, arbitrary observables of an original model with multiple…
Shoichiro Tsutsui, Takahiro M. DoiAug 18, 2015
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Conformal symmetry vs. chiral symmetry breaking in the SU(3) sextet model
We present new results for the SU(3) "sextet model" with two flavors transforming according to the two-index symmetric representation of the gauge group. The simulations are performed using…
Vincent Drach, Martin Hansen, Ari Hietanen et al.Aug 18, 2015
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Finite Volume Corrections to the Electromagnetic Mass of Composite Particles
The long-range electromagnetic interaction presents a challenge for numerical computations in QCD + QED. In addition to power-law finite volume effects, the standard lattice gauge theory approach…
Jong-Wan Lee, Brian C. TiburziAug 17, 2015
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Positivity of center subsets for QCD
We further pursue an approach to the sign problem of quantum chromodynamics at nonzero chemical potential, in which configurations of the lattice path integral are gathered into subsets. In the…
Jacques Bloch, Falk BruckmannAug 14, 2015
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A look inside charmed-strange baryons from lattice QCD
The electromagnetic form factors of the spin-3/2 Ω baryons, namely Ω, Ωc, Ωcc and Ωccc, are calculated in full QCD on 323× 64 PACS-CS lattices with a pion mass of…
K. U. Can, G. Erkol, M. Oka et al.Aug 12, 2015
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Can we decide whether QCD is confining or not at high temperature?
At high temperature measurements of the Polyakov loop suggest a deconfinement transition to the (strongly interacting) quark-gluon plasma. At the same time at the infinitely large temperature the…
L. Ya. GlozmanAug 12, 2015
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Recent progress in lattice calculations of properties of open-charm mesons
Recent progress in lattice calculations of properties of open-charm mesons, both regular and exotic, is reviewed, with an emphasis on spectroscopy. After reviewing recent calculations of excited…
Daniel MohlerAug 11, 2015
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Justification of the complex Langevin method with the gauge cooling procedure
Recently there has been remarkable progress in the complex Langevin method, which aims at solving the complex action problem by complexifying the dynamical variables in the original path integral. In…
Keitaro Nagata, Jun Nishimura, Shinji ShimasakiAug 10, 2015
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Potential description of charmonium and charmed-strange mesons from lattice QCD
We present spin-independent and spin-spin interquark potentials for the charmonium and charmed-strange mesons, which are calculated in 2+1 flavor lattice QCD simulations using the PACS-CS gauge…
Taichi Kawanai, Shoichi SasakiAug 10, 2015
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Multipoint reweighting method and its applications to lattice QCD
The reweighting method is widely used in numerical studies of QCD, in particular, for the cases in which the conventional Monte-Carlo method cannot be applied directly, e.g., finite density QCD.…
R. Iwami, S. Ejiri, K. Kanaya et al.Aug 7, 2015
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Hindered M1 Radiative Decay of Υ(2S) from Lattice NRQCD
We present a calculation of the hindered M1 Υ(2S) ηb(1S) γ decay rate using lattice non-relativistic QCD. The calculation includes spin-dependent relativistic corrections to the NRQCD action…
Ciaran Hughes, Rachel J. Dowdall, Christine T. H. Davies et al.Aug 7, 2015
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Schwinger Model Mass Anomalous Dimension
The mass anomalous dimension for several gauge theories with an infrared fixed point has recently been determined using the mode number of the Dirac operator. In order to better understand the…
Liam KeeganAug 7, 2015
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Emergence of a new SU(4) symmetry in the baryon spectrum
Recently a large degeneracy of J=1 mesons, that is larger than the SU(2)L × SU(2)R × U(1)A symmetry of the QCD Lagrangian, has been discovered upon truncation of the near-zero modes…
M. Denissenya, L. Ya. Glozman, M. PakAug 6, 2015
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Colorful plane vortices and Chiral Symmetry Breaking in SU(2) Lattice Gauge Theory
We investigate plane vortices with color structure. The topological charge and gauge action of such colorful plane vortices are studied in the continuum and on the lattice. These configurations are…
Seyed Mohsen Hosseini Nejad, Manfried Faber, Roman HöllwieserAug 5, 2015
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Nucleon-pion-state contributions in the determination of the nucleon axial charge
The nucleon-pion-state contributions to QCD 2- and 3-point functions used in the calculation of the nucleon axial charge are studied in chiral perturbation theory. For sufficiently small quark masses…
Oliver BarAug 5, 2015
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Two-Nucleon Higher Partial-Wave Scattering from Lattice QCD
We present a determination of nucleon-nucleon scattering phase shifts for l >= 0. The S, P, D and F phase shifts for both the spin-triplet and spin-singlet channels are computed with lattice Quantum…
Evan Berkowitz, Thorsten Kurth, Amy Nicholson et al.Aug 4, 2015
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Dual simulation of the 2-dimensional lattice U(1) gauge-Higgs model with a topological term
The 2-dimensional U(1) gauge-Higgs model with a topological term is a simple example of a lattice field theory where the complex action problem comes from the topological term. We show that the model…
Christof Gattringer, Thomas Kloiber, Michael Müller-PreusskerAug 4, 2015
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Magnetic properties of light nuclei from lattice QCD
After a short review of Lattice QCD methodology and techniques, I summarize recent results of Lattice QCD calculations of the interactions of nucleons and light nuclei with magnetic fields at pion…
Martin J. SavageAug 4, 2015
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Baryonic Matter Onset in Two-Color QCD with Heavy Quarks
We study the cold and dense regime in the phase diagram of two-color QCD with heavy quarks within a three-dimensional effective theory for Polyakov loops. This theory is derived from two-color QCD in…
Philipp Scior, Lorenz von SmekalAug 3, 2015
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Complex Langevin simulation in condensed matter physics
The complex Langevin method is one hopeful candidate to tackle the sign problem. This method is applicable not only to QCD but also to nonrelativistic field theory, such as condensed matter physics.…
Arata Yamamoto, Tomoya HayataAug 3, 2015
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Exploring possibly existing q q b b tetraquark states with q q = ud, ss, cc
We compute potentials of two static antiquarks in the presence of two quarks qq of finite mass using lattice QCD. In a second step we solve the Schrödinger equation, to determine, whether the…
Antje Peters, Pedro Bicudo, Krzysztof Cichy et al.Aug 3, 2015
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Excited-state contamination in nucleon correlators from chiral perturbation theory
Techniques to compute hadron properties from lattice QCD rely upon the limit of long time separation. For baryons, the signal-to-noise problem often restricts one to time separations that are not…
Brian C. TiburziAug 1, 2015
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On the color structure of Yang-Mills theory with static sources in a periodic box
We present an exploratory numerical study on the lattice of the color structure of the wave functionals of the SU(3) Yang-Mills theory in the presence of a q q static pair. In a spatial box…
L. Giusti, A. L. Guerrieri, S. Petrarca et al.Aug 1, 2015
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Massive photons: an infrared regularization scheme for lattice QCD+QED
Standard methods for including electromagnetic interactions in lattice quantum chromodynamics calculations result in power-law finite-volume corrections to physical quantities. Removing these by…
Michael G. Endres, Andrea Shindler, Brian C. Tiburzi et al.Jul 31, 2015
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