Veljko Dmitrasinovic
(Institute of Physics Belgrade)
03/02/2014, 11:00
The nucleon $\Sigma$ term's large "observed" value (> 55 MeV) has long been interpreted as a sign of hidden strangeness in the nucleon. We have calculated the $\Sigma_{\pi N}$ term on the basis of mixing of chiral multiplets, and using known constraints on the current quark masses $m_{u}^{0}, m_{d}^{0}$ and the flavor-singlet and isostriplet axial couplings. We show that the $[(1,1/2)\oplus...
Natasa Raicevic
(University of Montenegro)
03/02/2014, 11:30
ew precision measurements of the double-differential inclusive
neutral-current cross section, measured with the ZEUS detector at
HERA at a centre-of-mass energy of 318 GeV in e+p and e-p collisions
are shown. They span the kinematic domain of high momentum
transfer Q^2>650 GeV^2 and high Bjorken-x~1.
Using the HERA data collected at three different centre-of-mass
energies, both the...
Leonid Glozman
(Graz U)
03/02/2014, 16:30
We study the effect of the chiral symmetry breaking low-lying modes of the Dirac operator and of the higher-lying modes on the hadron mass generation and on symmetries of hadrons in lattice QCD simulations.
Manfried Faber
(Vienna UT)
03/02/2014, 18:00
We analyze the creation of near-zero modes from would-be zero modes of various topological charge contributions from classical center vortices in $SU(2)$ lattice gauge theory. We show that colorful spherical vortex and instanton configurations have very similar Dirac eigenmodes and also vortex intersections are able to give rise to a finite density of near-zero modes, leading to chiral...
Tobias Stockmanns
(Forschungszentrum Jülich GmbH)
04/02/2014, 09:30
The PANDA experiment is one of the key components of the future "Facility for Antiproton and Ion Research" at Darmstadt. Its goal is to study the features of the strong force in the transition region between perturbative and non-perturbative QCD. Therefore it utilizes the phase space cooled antiproton beam with a beam momentum between 1.5 GeV/c and 15 GeV/c to do precision measurements in the...
Alessandro Pilloni
(Sapienza U.)
04/02/2014, 10:00
Since ten years experiments have been observing a host of exotic states decaying into heavy quarkonia. The interpretation of most of them still remains uncertain and, in some cases, controversial, notwithstanding a considerable progress has been made on the quality of the experimental information available and a number of ideas and models have been put forward to explain the observations. In...
Thomas Cohen
(University of Maryland)
04/02/2014, 11:00
Exotic hadrons are those which cannot be described in a naive quark model. This talk discusses possible insights the large Nc limit of QCD can give us about exotics. The focus will be on tetraquark states. One key feature of the analysis is the fact there is more than one way to extrapolate to the large Nc limit.
Thomas Wolkanowski
(Johann Wolfgang Goethe-Universität)
04/02/2014, 11:30
We study basic properties of scalar hadronic resonances within the so-called extended linear sigma model (eLSM), which is an effective model of QCD based on chiral symmetry and dilatation invariance. In particular, we focus on the mass and decay width of the isovector state $a_{0}(1450)$ and perform a numerical study of the propagator pole(s) on the unphysical Riemann sheets. Here, the...
Mario Luiz L da Silva
(Universidade Federal de Pelotas)
04/02/2014, 17:00
In this work we present the results of a theoretical analysis of the data on photoproduction of $f_0(980)$ meson in the laboratory photon energy between 3.0 and 3.8 GeV. A comparison is done to the measurements performed by the CLAS collaboration at JLab accelerator for the exclusive reaction $\gamma p\rightarrow pf_0(980)$. In the analysis the partial S-wave differential cross section is...
Khaled Teilab
(Frankfurt U)
04/02/2014, 18:00
We study the production of mesons in nucleon-nucleon reactions at center-of-mass momenta of a few GeV using an $N_f=2$ linear sigma model, extended by including the $N_f=2$ multiplets of (pseudo-) scalar and (axial-) vector mesons and a doublet of the nucleon together with its chiral partner (the $N^*(1535)$ or $N^*(1650)$ resonance).
Andrey Grabovskiy
(Budker Institute of Nuclear Physics (RU))
04/02/2014, 18:30
The derivation, properties, and application of the low x evolution equation for proton Green function are discussed.
Stanislaw Mrowczynski
(National Center of Nuclear Reserach, Warsaw, Poland)
05/02/2014, 09:30
Motivated by the AdS/CFT duality, we study the N=4 super Yang-Mills plasma in the regime of weak coupling and compare it to the QCD plasma. Collective excitations and collisional processes are discussed. Since the Keldysh-Schwinger approach is used, the collective excitations in both equilibrium and non-equilibrium plasma are under consideration. The dispersion relations of gluon, fermion, and...
Iouri Vassiliev
(GSI Helmholtzzentrum für Schwerionenforschung)
05/02/2014, 11:00
The Compressed Baryonic Matter (CBM) experiment at FAIR is designed to explore the QCD phase diagram in the region of high baryon densities and moderate temperatures. The key CBM observables include particles containing hidden charm – J/psi and Psi’, open charm – D0, D+ , D* and Lambda_c, low-mass vector mesons decaying into leptons and multi-strange hyperons. Particularly demanding is the...
Uri Karshon
(Weizmann.Institute of Science)
05/02/2014, 11:30
The copious production of charm quarks at HERA has yielded a detailed understanding of QCD dynamics, the only measure of the charm contribution to the proton structure, as well as measurements of the charm mass and the fragmentation parameters of charmed hadrons. Several measurements of charm production in deep inelastic scattering, using different decay modes, are presented, both new...
Gilad Lifschytz
(University of Haifa at Oranim)
05/02/2014, 16:30
I will review various effects connected to magnetic fields in the context of holographic QCD. These will include magnetic catalysis, new phases of matter and new phase transitions.
Grzegorz Pawel Gach
(AGH University of Science and Technology (PL))
05/02/2014, 17:00
Data in which a proton is tagged along the beampipe after the primary interaction represents the cleanest way to measure diffraction. Data from both H1 and ZEUS collaborations on inclusive diffractive deep inelastic scattering, with a tagged proton, have been combined. Inclusive diffractive deep inelastic scattering can be considered as the exchange of a colourless object and is amenable to...
Frederic Brünner
(Vienna UT)
05/02/2014, 18:30
Some aspects of the Sakai-Sugimoto model, a holographic top-down approach capturing many features of quantum chromodynamics, are presented. Meson spectra, finite-temperature and finite-baryon-density effects are discussed. Furthermore, the description of glueballs within this framework is revisited and possible directions for future developments are discussed.
Jose R. Pelaez
(Universidad COmplutense)
06/02/2014, 09:00
Our results on obtaining the Regge trajectory of a resonance from its pole in a scattering process and from analytic constraints in the complex angular momentum plane will be presented. The method, suited for resonances that dominate an elastic scattering amplitude, has been applied to the rho(770) and the f0(500) resonances. Whereas for the former we obtain a linear Regge trajectory,...
Robert Kaminski
(Institute of Nuclear Physics PAN)
06/02/2014, 09:30
Recent works on the pion-pion scattering amplitudes done with use of one-subtracted dispersion relations [1] led to large modification of the f0(500) parameters, especially its width [2].
Immediately it led to long waited significant changes in the Particle Data Group Tables (Particle Listings and "Note on scalar mesons below 2 GeV" in [3]).
Such changes resulted in the need to redefine a...
Arthur Dromard
(Goethe University)
06/02/2014, 11:30
At small lattice spacing, or when using e.g. overlap fermions,
lattice QCD simulations tend to become stuck in a single topological
sector. Physical observables, e.g. hadron masses, then differ from
their full QCD counterparts by 1/V corrections, where V is the
space-time volume. These corrections can be calculated order by order
using the saddle point method. We calculate all...
Tereza Mendes
(University of Sao Paulo)
06/02/2014, 16:30
We investigate on the lattice the properties of electric and magnetic gluon propagators for finite-temperature SU(2) theory around the deconfinement transition. Special care is taken to handle the very strong systematic effects that arise in the critical region.
Maryam Soleymaninia
(Semnan university)
06/02/2014, 18:00
We are studying fragmentation functions (FFs) applying different hadronization processes and we are determining FFs from global analysis on single-inclusive electron-positron annihilation (SIA) and semi-inclusive deep inelastic scattering (SIDIS) data at NLO. We perform an improvement to the FFs of pion and kaon at next-to-leading order (NLO), including very recently single-inclusive...
Sara Taheri Monfared
(Semnan University)
06/02/2014, 18:30
We perform a fit to all available experimental data of polarized structure functions in the framework of perturbative QCD, at next-to-leading order (NLO)
approximation. We include target mass correction and higher twist effects on our fitting procedure and study their effects on physically interesting quantities. Nuclear polarized structure functions are described based on our fit result....
Daniele Binosi
(ECT* Fondazione Bruno Kessler)
07/02/2014, 09:30
I discuss certain characteristic features encoded in some of the fundamental QCD Green's functions, whose origin can be traced back to the (Landau gauge) nonperturbative masslessness of the ghost field. Specifically, the ghost loops that contribute to these Green's functions display infrared divergences, akin to those encountered in the perturbative treatment, in contradistinction to the...
Milan Vujinovic
(Karl-Franzens University, Graz)
07/02/2014, 11:00
Self-consistent solutions for the three-gluon vertex in Landau gauge QCD using a Bose-symmetric truncation of Dyson-Schwinger equations are presented. A detailed discussion of the symmetry properties of the vertex and its basis decomposition is made, together with suitable fits for phenomenological applications. Increasing the number of light quark flavors leads to a qualitative change of the...
Markus Hopfer
(University of Graz)
07/02/2014, 11:30
Using the Dyson-Schwinger approach we investigate QCD with a relatively large number of quark flavors in the chiral limit.
A self-consistent treatment of the corresponding propagator equations enables us to study unquenching effects directly via the quark loop diagram in the gluon equation.
Above the critical number of fermion flavors the non-perturbative running coupling develops a plateau...
Tin Sulejmanpasic
(Regensburg U)
07/02/2014, 16:30
The problem of confinement is a long lasting problem in physics. Recently however there has been great progress in understanding confinement in a large class of locally 4D supersymmetric and non-supersymmetric theories with the help of instanton-monopoles. I will discuss how these can help us understand confinement in pure YM and QCD.
Savvas Zafeiropoulos
(Universite Blaise Pascal)
07/02/2014, 17:00
We discuss the behavior of the spectral densities of the non-Hermitian Wilson Dirac operator and we derive interesting relations for the leading order physical and Wilson LECs of Wilson $\chi$-PT. These relations can be used to determine the LECs from lattice simulations.
Luca Panizzi
(University of Southampton)
07/02/2014, 18:00
Vector-like quarks are predicted in various scenarios of new physics, and their peculiar signatures from both pair and single production have been already investigated in detail. However no signals of vector-like quarks have been detected so far, pushing limits on their masses above 600-700 GeV, depending on assumptions on their couplings. Experimental searches consider specific final states...
Kalliopi Iordanidou
(UOA (GR) / Brookhaven National Laboratory (US))
07/02/2014, 18:30
An οverview of the Higgs boson search latest results in the ATLAS experiment at the LHC, after the discovery, is presented. The various decay channels in the context of the Standard Model and BSM searches are discussed. Latest results on the properties of the boson are given, with focus on the mass measurement, spin, parity and
production mechanisms.
Dubravko Klabucar
(University of Zagreb, Physics Departrment)
A set of equations generalizing the Witten-Veneziano relation
is studied. We present an analytic solution thereof which gives
results, such as eta and eta' masses and decay constants, in
agreement with results previously obtained numerically. The
analytic solution improves the understanding of the description
of the eta-eta' complex. It also supports our approach to...
