Disconnected diagrams with twisted-mass fermionsThe latest results from the Twisted-Mass collaboration on disconnected diagrams at the physical value of the pion mass are presented. In particular, we focus on the sigma terms, the axial charges and…Abdou Abdel-Rehim, Constantia Alexandrou, Martha Constantinou et al.·Nov 11, 2016SaveLearn
Deconfinement, chiral transition and localisation in a QCD-like modelWe study the problems of deconfinement, chiral symmetry restoration and localisation of the low Dirac eigenmodes in a toy model of QCD, namely unimproved staggered fermions on lattices of temporal…Matteo Giordano, Sandor D. Katz, Tamas G. Kovacs et al.·Nov 10, 2016SaveLearn
Electromagnetic Effects on Strongly Interacting QCD-MatterIn order to study the temperature dependence of the quark-hadron phase structure and the QCD equation of state in vanishing and finite magnetic field, the SU(3) Polyakov linear-sigma model is…Abdel Magied Abdel Aal Diab, Abdel Nasser Tawfik, M. T. Hussein·Nov 10, 2016SaveLearn
Phase diagram of the two-dimensional O(3) model from dual lattice simulationsWe have simulated the asymptotically free two-dimensional O(3) model at nonzero chemical potential using the model's dual representation. We first demonstrate how the latter solves the sign…Falk Bruckmann, Christof Gattringer, Thomas Kloiber et al.·Nov 10, 2016SaveLearn
On complex Langevin dynamics and zeroes of the measure II: Fermionic determinantLattice QCD at non-vanishing chemical potential is studied using the complex Langevin equation (CLE). One of the conditions for the correctness of the results of the CLE is that the zeroes of the…G. Aarts, E. Seiler, D. Sexty et al.·Nov 9, 2016SaveLearn
On complex Langevin dynamics and zeroes of the measure I: Formal proof and simple modelsIn the complex Langevin approach to lattice simulations at nonzero density, zeroes of the fermion determinant lead to a meromorphic drift and hence a need to revisit the theoretical derivation. We…Gert Aarts, Erhard Seiler, Denes Sexty et al.·Nov 9, 2016SaveLearn
Topological susceptibility in finite temperature (2+1)-flavor QCD using gradient flowWe compute the topological charge and its susceptibility in finite temperature (2+1)-flavor QCD on the lattice applying a gradient flow method. With the Iwasaki gauge action and nonperturbatively…Yusuke Taniguchi, Kazuyuki Kanaya, Hiroshi Suzuki et al.·Nov 8, 2016SaveLearn
Prediction of positive parity Bs mesons and search for the X(5568)We use a combination of quark-antiquark and B(*)K interpolating fields to predict the mass of two QCD bound states below the B*K threshold in the quantum channels JP=0+ and 1+. The…Daniel Mohler, C. B. Lang, Sasa Prelovsek·Nov 8, 2016SaveLearn
Field-strength correlators for QCD in a magnetic backgroundWe present the results of an exploratory study (by means of Monte Carlo simulations on the lattice) of the properties of the gauge-invariant two-point correlation functions of the gauge-field…Enrico Meggiolaro, Massimo D'Elia, Michele Mesiti et al.·Nov 8, 2016SaveLearn
A variational method for spectral functionsThe Generalized Eigenvalue Problem (GEVP) has been used extensively in the past in order to reliably extract energy levels from time-dependent Euclidean correlators calculated in Lattice QCD. We…Tim Harris, Harvey B. Meyer, Daniel Robaina·Nov 8, 2016SaveLearn
Temperature dependence of topological susceptibility using gradient flowWe study temperature dependence of the topological susceptibility with the Nf=2+1 flavors Wilson fermion. We have two major interests in this paper. One is a comparison of gluonic and fermionic…Yusuke Taniguchi, Shinji Ejiri, Kazuyuki Kanaya et al.·Nov 8, 2016SaveLearn
Lattice calculation of the pion transition form factor π0 γ* γ*We calculate the pion transition form factor Fπ0γ*γ*(q12,q22), which describe the interaction of an on-shell pion with two off-shell photons, using lattice QCD simulations with two…Antoine Gérardin, Harvey B. Meyer, Andreas Nyffeler·Nov 7, 2016SaveLearn
Complex Langevin for Lattice QCD at T=0 and μ 0QCD at finite quark-/baryon-number density, which describes nuclear matter, has a sign problem which prevents direct application of standard simulation methods based on importance sampling. When such…D. K. Sinclair, J. B. Kogut·Nov 7, 2016SaveLearn
Nuclear PhysicsLattice QCD is making good progress toward calculating the structure and properties of light nuclei and the forces between nucleons. These calculations will ultimately refine the nuclear forces,…Martin J. Savage·Nov 7, 2016SaveLearn
Mass anomalous dimension of SU(2) using the spectral density methodSU(2) with Nf = 6 and Nf = 8 are believed to have an infrared conformal fixed point. We use the spectral density method cross referenced with the mass step scaling method to evaluate the coupling…Joni M. Suorsa, Viljami Leino, Jarno Rantaharju et al.·Nov 7, 2016SaveLearn
Parity doubling of nucleons, Delta and Omega baryons across the deconfinement phase transitionIn this work we analyse positive- and negative-parity channels for the nucleon (spin 1/2 octet), Δ and Ω baryons (spin 3/2 decuplet) using lattice QCD. In Nature, at zero temperature, chiral…Gert Aarts, Chris Allton, Davide De Boni et al.·Nov 7, 2016SaveLearn
Bc decays from highly improved staggered quarks and NRQCDWe calculate semileptonic form factors for the decays Bc ηc \, l ν and Bc J/ψ\, l ν over the entire q2 range, using a highly improved lattice quark action for charm at several…Brian Colquhoun, Christine Davies, Jonna Koponen et al.·Nov 7, 2016SaveLearn
Lattice QCD results on cumulant ratios at freeze-outRatios of cumulants of net proton-number fluctuations measured by the STAR Collaboration show strong deviations from a skellam distribution, which should describe thermal properties of cumulant…Frithjof Karsch·Nov 7, 2016SaveLearn
Monte Carlo methods in continuous time for lattice HamiltoniansWe solve a variety of sign problems for models in lattice field theory using the Hamiltonian formulation, including Yukawa models and simple lattice gauge theories. The solutions emerge naturally in…Emilie Huffman·Nov 5, 2016SaveLearn
New Noise Subtraction Methods in Lattice QCDNoise subtraction techniques can help reduce the statistical uncertainty in the extraction of hard to detect signals. We describe new noise subtraction methods in Lattice QCD which apply to…Suman Baral, Walter Wilcox, Ronald B. Morgan·Nov 4, 2016SaveLearn
The multi-flavor Schwinger model with chemical potential - Overcoming the sign problem with Matrix Product StatesDuring recent years there has been an increasing interest in the application of matrix product states, and more generally tensor networks, to lattice gauge theories. This non-perturbative method is…Mari Carmen Bañuls, Krzysztof Cichy, J. Ignacio Cirac et al.·Nov 4, 2016SaveLearn
Computing the nucleon Dirac radius directly at Q2=0We describe a lattice approach for directly computing momentum derivatives of nucleon matrix elements using the Rome method, which we apply to obtain the isovector magnetic moment and Dirac radius.…Nesreen Hasan, Michael Engelhardt, Jeremy Green et al.·Nov 4, 2016SaveLearn
Tackling the sign problem with a moment expansion and application to Heavy dense QCDHeavy-Dense QCD (HDQCD) is a popular theory to investigate the sign problem in quantum field theory. Besides its physical applications, HDQCD is relatively easy to implement numerically: the…Nicolas Garron, Kurt Langfeld·Nov 4, 2016SaveLearn
Algorithms for Disconnected Diagrams in Lattice QCDComputing disconnected diagrams in Lattice QCD (operator insertion in a quark loop) entails the computationally demanding problem of taking the trace of the all to all quark propagator. We first…Arjun Singh Gambhir, Andreas Stathopoulos, Kostas Orginos et al.·Nov 3, 2016SaveLearn
Complex spectrum of spin models for finite-density QCDWe consider the spectrum of transfer matrix eigenvalues associated with Polyakov loops in lattice QCD at strong coupling. The transfer matrix at finite density is non-Hermitian, and its eigenvalues…Hiromichi Nishimura, Michael Ogilvie, Kamal Pangeni·Nov 3, 2016SaveLearn