Browsing by Subject "Hadrons"
Now showing items 1-20 of 29
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Conference Object
Calculation of the decay width of decuplet baryons
(Proceedings of Science (PoS), 2015)We calculate the coupling constant and decay width of the decuplet to octet baryon transitions in lattice QCD using the transfer matrix method. The transition amplitude is related to the coupling constant and via the Fermi's ...
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Article
Colloquium: The shape of hadrons
(2012)This Colloquium addresses the issue of the shape of hadrons and, in particular, that of the proton. The concept of shape in the microcosm is critically examined. Special attention is devoted to properly define the meaning ...
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Conference Object
Computation of correlation matrices for tetraquark candidates with Jp = 0+ and flavor structure q1q2q3q3
(Proceedings of Science (PoS), 2015)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 theoretical and ...
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Conference Object
Determination of the Δ resonance width from lattice QCD
(Proceedings of Science (PoS), 2013)A method suitable for extracting resonance parameters of unstable baryons in lattice QCD is examined. The method is applied to the strong decay of the Δ to a pion-nucleon state, extracting the pND coupling constant and Δ ...
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Conference Object
Di-pion and di-electron production in NN reactions with HADES at 1.25GeV incident beam energy.
(2013)Significant isospin effects are observed by the HADES collaboration in inclusive dilepton production channels in the pp and quasi free np experiments at 1.25 GeV kinetic beam energy. Triggered by this observation, analyses ...
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Conference Object
Dilepton production in ion-ion collisions studied using HADES
(2007)The High-Acceptance Di-Electron Spectrometer installed at GSI Darmstadt is a second generation experiment to study production of dielectron pairs from proton, pion and nucleus induced reactions at the SIS/BEVALAC energy ...
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Conference Object
Double pion production in np and pp collisions at 1.25 GeV with HADES
(Proceedings of Science (PoS), 2012)The results of double pion production in np and pp collisions at an incident beam energy of 1.25 GeV with the HADES spectrometer at GSI are presented. The np-reactions were studied in d p collisions at 1.25 GeV/u using ...
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Article
Hades experiments: Investigation of hadron in-medium properties
(2013)Hadron modifications in nuclear matter are discussed in connection to chiral symmetry restoration and/or hadronic many body effects. Experiments with photon, proton and heavy ion beams are used to probe properties of hadrons ...
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Conference Object
Hadron deformation and form factors from lattice QCD
(2007)We review the current status of lattice QCD studies of the nucleon system. In particular, we focus on the determination of the shape of the nucleon by probing its wave function as well as by evaluating the N to Δ transition ...
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Doctoral Thesis Open Access
Hadron form factors and hadron deformation from lattice QCD
(Πανεπιστήμιο Κύπρου, Σχολή Θετικών και Εφαρμοσμένων Επιστημών/ University of Cyprus, Faculty of Pure and Applied Sciences, 2008-09)Σε αυτή την εργασία μελετάμε παράγοντες μορφής (Form Factors) αδρονίων και την παραμόρφωση αδρονίων. Οι παράγοντες μορφές των αδρονίων περιέχουν πληροφορίες για την σύσταση τους, το μέγεθος τους και το σχήμα τους. Ο ...
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Article
Hadron properties from lattice QCD
(2014)We discuss the status of current dyanmical lattice QCD simulations in connection to the emerging results on the low-lying baryon spectrum, excited states of the nucleon and the investigation of the structure of scalar ...
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Conference Object
Importance of closed quark loops for lattice QCD studies of tetraquarks
(Proceedings of Science (PoS), 2016)To investigate the light scalar tetraquark candidate a0(980) (quantum numbers JP =0+), a correlation matrix including a variety of two- and four-quark interpolating operators has to be computed. We discuss efficient ...
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Article
Inclusive e+e- pair production in p+p and p+Nb collisions at Ekin = 3.5 GeV
(2011)We report on recent data of e+e- pair emission in proton nucleus collisions at energies above the light vector meson production thresholds. Invariant mass distributions for the p+Nb system at Ekin = 3.5 GeV are compared ...
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Article
Investigating efficient methods for computing four-quark correlation functions
(2017)We discuss and compare the efficiency of various methods, combinations of point-to-all propagators, stochastic timeslice-to-all propagators, the one-end trick and sequential propagators, to compute two-point correlation ...
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Article
Investigation of light and heavy tetraquark candidates using lattice QCD
(2014)We review the status of an ongoing long-term lattice investigation of the spectrum and structure of tetraquark candidates. We focus on the light scalar meson a0(980). First steps regarding the study of a possibly existing ...
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Conference Object
N to Δ electromagnetic and axial form factors in full qcd
(2008)Lattice results on the N to Δ electromagnetic, axial-vector and pseudoscalar form factors are evaluated using dynamical staggered sea quarks and domain wall valence quarks for pion masses in the range of 580-350 MeV, as ...
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Conference Object
Nucleon generalized form factors with twisted mass fermions
(Proceedings of Science (PoS), 2013)We present results on the nucleon form factors, momentum fraction and helicity moment for Nf = 2 and Nf = 2+1+1 twisted mass fermions for a number of lattice volumes and lattice spacings. First results for a new Nf = 2 ...
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Conference Object
One and two-pion production in pp reactions with the high acceptance Di-electron spectrometer at GSI
(CERN, 2013)We present exclusive meaurements of the pp→pnπ+ and pp→ppπO reactions at 1.25 GeV, 2.2 GeV and 3.5 GeV and of the pp→ppπ+π- reaction at 1.25 GeV with the High Acceptance Di-Electron Spectrometer at GSI. Total and differential ...
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Article
Production of χc1 and χc2 in pp̄ collisions at √s = 1.8 TeV
(2001)The charmonium system was studied by measuring the relative cross sections of the Xc1 and Xc2 produced in pp collisions at √ s = 1.8 TeV. As a result, the ratio of production cross sections was established.
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Article
Renormalization and mixing in lattice QCD: The case of the chromomagnetic operator
(2014)We study matrix elements of the "chromomagnetic" operator on the lattice. This operator is contained in the strangeness-changing effective Hamiltonian which describes electroweak effects in the Standard Model and beyond. ...