Conference proceedings & (yet) unpublished articles

• Gaia Data Release 2: The celestial reference frame (Gaia-CRF2) September 26, 2019
  arXiv:1804.09377Astron.Astrophys. 616 (2018) A14by: Mignard, F. (U. Montpellier 2, LUPM) et al.Abstract: Context. The second release of Gaia data (Gaia DR2) contains the astrometric parameters for more than half a million quasars. This set defines a kinematically non-rotating reference frame in the optical domain. A subset of these quasars have accurate VLBI […]
• Gaia Data Release 2: Summary of the contents and survey properties October 10, 2018
  arXiv:1804.09365Astron.Astrophys. 616 (2018) A1by: Brown, A.G.A. (Leiden U.) et al.Abstract: We present the second Gaia data release, Gaia DR2, consisting of astrometry, photometry, radial velocities, and information on astrophysical parameters and variability, for sources brighter than magnitude 21. In addition epoch astrometry and photometry are provided f […]
• Open-Flavour Mesons from the Angle of Bethe, Dyson, Salpeter, Schwinger, et al October 3, 2018
  arXiv:1810.01197HEPHY-PUB 1008/18 (2018)PoS Confinement2018 (2018) 252by: Hilger, Thomas (Vienna, OAW) et al.Abstract: Recently, we completed a comprehensive investigation of a huge part of the entire meson spectrum by considering both quarkonia and open-flavour mesons by means of a single common framework which unites the homogeneous Bethe-Salpeter equation […]
• Global Dyson-Schwinger-Bethe-Salpeter Approach to Mesons with Open Flavour July 18, 2018
  arXiv:1807.06245HEPHY-PUB 1003/18 (2018)EPJ Web Conf. 192 (2018) 00038by: Hilger, Thomas (Vienna, OAW) et al.Abstract: Exploiting an interplay of the Bethe-Salpeter equation enabling us to regard mesons as bound states of quark and antiquark and the Dyson-Schwinger equation controlling the dressed quark propagator, we amend existing studies of quarkonia by a […]
• Chiral-partner D mesons in a heat bath within QCD sum rules January 8, 2018
  arXiv:1801.01472J.Phys. G45 (2018) 085104by: Buchheim, T. (HZDR, Dresden) et al.Abstract: Utilizing QCD sum rules, we extract the temperature dependences of the spectral properties of the pseudo-scalar and scalar D mesons regarded as chiral partners. Besides the masses also decay constants are analyzed as the D meson yields in heavy-ion collisions may be sen […]
• S- and D-wave vector charmonia September 6, 2017
  arXiv:1709.01331J.Phys.Conf.Ser. 1024 (2018) 012010by: Krassnigg, A. (Graz U.) et al.Abstract: We revisit earlier calculations of leptonic decay constants of vector charmonia and present and illustrate our decomposition of the corresponding covariant Bethe-Salpeter amplitudes in terms of orbital angular momentum as interpreted in the meson’s rest frame. Our […]
• Charming quasi-exotic open-flavor mesons November 15, 2016
  arXiv:1611.04334EPJ Web Conf. 137 (2017) 01010by: Hilger, Thomas (Vienna, OAW) et al.Abstract: We discuss charmed mesons in the covariant Dyson-Schwinger-Bethe-Salpeter-equation approach. In particular we computed masses, leptonic decay constants, and an orbital-angular-momentum decomposition for a basic set of states. We also report an efficient way to trea […]
• Leptonic decays of $D$-wave vector quarkonia March 24, 2016
  arXiv:1603.07232J.Phys.Conf.Ser. 742 (2016) 012032by: Krassnigg, A. (Graz U.) et al.Abstract: We give a short and basic introduction to our covariant Dyson-Schwinger-Bethe- Salpeter-equation approach using a rainbow-ladder truncated model of QCD, in which we investigate the leptonic decay properties of heavy quarkonium states in the pseudoscalar and vector c […]
• Algebraic vacuum limits of QCD condensates from in-medium projections of Lorentz tensors November 20, 2015
  arXiv:1511.06234J.Phys. G43 (2016) 055105by: Buchheim, Thomas (Dresden, Tech. U.) et al.Abstract: Utilizing the in-medium Lorentz decomposition of operators generating QCD condensates we derive general constraints among the latter ones by the requirement of a smooth transition from medium to vacuum. In this way we relate the vacuum limits of heretofore unrel […]
• Chiral symmetry aspects in the open charm sector September 22, 2015
  arXiv:1509.06144J.Phys.Conf.Ser. 668 (2016) 012047by: Buchheim, Thomas (Forschungszentrum Dresden Rossendorf) et al.Abstract: QCD sum rules serve as tools to investigate changing hadronic properties in a hot and/or dense nuclear medium. The role of chiral symmetry breaking and restoration effects in a medium can be addressed also in the heavy-light meson sec […]
• Heavy-quark expansion for $D$ and $B$ mesons in nuclear matter October 2, 2014
  arXiv:1410.0143EPJ Web Conf. 81 (2014) 05007by: Buchheim, Thomas (HZDR, Dresden) et al.Abstract: The planned experiments at FAIR enable the study of medium modifications of D and B mesons in (dense) nuclear matter. Evaluating QCD sum rules as a theoretical prerequisite for such investigations encounters heavy-light four-quark condensates. We utilize an exten […]
• Defining medium-specific condensates in QCD sum rules for $D$ and $B$ mesons September 9, 2014
  arXiv:1409.2228Nucl.Part.Phys.Proc. 258-259 (2015) 213-216by: Buchheim, Thomas (HZDR, Dresden) et al.Abstract: QCD sum rules for $D$ and $B$ mesons in a strongly interacting environment require the decomposition of Gibbs averaged operators related to tensor structures. We present a procedure to decompose these operators into vacuum and medium-specific parts, […]
• First Look at Heavy–Light Mesons with a Dressed Quark–Gluon Vertex August 6, 2014
  arXiv:1408.1077Few Body Syst. 56 (2015) 475-480by: Gómez-Rocha, María (Graz U.) et al.Abstract: Following up on earlier work, we investigate possible effects of a dressed quark-gluon vertex in heavy-light mesons. In particular, we study corrections to the popular rainbow-ladder truncation of the Dyson-Schwinger-Bethe-Salpeter equation system. We adopt a simp […]
• On a New Approach to Meson Phenomenology with the Bethe–Salpeter Equation July 31, 2014
  arXiv:1407.7970Few Body Syst. 56 (2015) 481-487by: Popovici, Carina (Graz U.) et al.Abstract: We investigate capabilities of the effective interaction in a rainbow-ladder truncated meson model of QCD within a covariant Landau-gauge Bethe-Salpeter-equation approach. Based upon past success for the light- as well as heavy-quark domains, we discuss the range of […]
• Medium Modifications of Mesons May 13, 2014
  by: Hilger, Thomas Uwe (Dresden, Tech. U.)Abstract: plane numerically and test the possibility to widen the applicability of the method to the sector of heavy-light mesons in the scalar and pseudo-scalar channels, such as the D mesons, by varying the momentum partitioning parameter. The solutions of the Dyson-Schwinger equation in the Wigner-Weyl phase of ch […]
• In-medium QCD sum rules for D mesons: A projection method for higher order contributions January 10, 2014
  arXiv:1401.2048J.Phys.Conf.Ser. 503 (2014) 012006by: Buchheim, Thomas (HZDR, Dresden) et al.Abstract: D mesons serve as excellent probes of hot and/or dense strongly interacting matter. They can provide insight into the restoration of chiral symmetry. The chiral condensate as well as other chirally odd condensates, such as certain four-quark condensates, are […]
• Four-quark condensates in open-charm chiral QCD sum rules January 4, 2012
  arXiv:1201.1183Prog.Part.Nucl.Phys. 67 (2012) 188-193by: Hilger, T. (Forschungszentrum Dresden Rossendorf) et al.Abstract: Recently, in Hilger et al. (2011) [1] QCD sum rules for chiral partners in the open-charm meson sector have been presented at nonzero baryon net density or temperature up to and including mass dimension 5. Referring to this, details conc […]
• In-medium excitations March 13, 2011
  Lect.Notes Phys. 814 (2011) 335-529by: Rapp, R. (Texas A-M) et al.Abstract: 1 Introduction 2 Electromagnetic probes and light vector mesons 3 Hadronic resonance spectroscopy 4 Strangeness 5 Open charm probes 6 Charmonium 7 Excitations of color-superconducting matter 8 Summary and relations to observables
• A Combined Solution of the Schwinger-Dyson and Bethe-Salpeter Equations for Mesons as $q\bar q$ Bound States December 25, 2010
  arXiv:1012.5372by: Dorkin, S.M. (Dresden, Tech. U.) et al.Abstract: The mass spectrum of heavy pseudoscalar mesons, described as quark-antiquark bound systems, is considered within the Bethe-Salpeter formalism with momentum dependent masses of the constituents. This dependence is found by solving the Schwinger-Dyson equation for quark propagators in rainbow- […]
• In-Medium Modifications of Scalar Charm Mesons in Nuclear Matter November 10, 2010
  arXiv:1011.2627Nucl.Phys.Proc.Suppl. 207-208 (2010) 277-280by: Hilger, Thomas (Forschungszentrum Dresden Rossendorf) et al.Abstract: Employing QCD sum rules the in-medium modifications of scalar charm mesons in a cold nuclear matter environment are estimated. The mass splitting of D*-D*-bar is quantified.
• Heavy pseudoscalar mesons in a Schwinger-Dyson--Bethe-Salpeter approach August 11, 2010
  arXiv:1008.2135Few Body Syst. 49 (2011) 247-254by: Dorkin, S.M. (Dubna, JINR) et al.Abstract: The mass spectrum of heavy pseudoscalar mesons, described as quark-antiquark bound systems, is considered within the Bethe-Salpeter formalism with momentum-dependent masses of the constituents. This dependence is found by solving the Schwinger-Dyson equation for qua […]
• Chiral symmetry, di-electrons and charm April 14, 2010
  arXiv:1004.2615PoS BORMIO2010 (2010) 045by: Kampfer, Burkhard (Forschungszentrum Dresden Rossendorf) et al.Abstract: We survey some prospects of identifying further in-medium modifications of hadrons in a strongly interacting medium with respect to ongoing experiment series of the HADES Collaboration and planned experiments of the CBM Collaboration at FAIR. […]
• QCD sum rules for D mesons in dense and hot nuclear matter January 3, 2010
  arXiv:1001.0522J.Phys. G37 (2010) 094054by: Hilger, T. (Forschungszentrum Dresden Rossendorf) et al.Abstract: Open charm mesons (pseudo-scalar and scalar as well as axial-vector and vector) propagating or resting in nuclear matter display an enhanced sensitivity to the chiral condensate. This offers new prospects to seek for signals of chiral restoration, in […]
• Chiral symmetry and open-charm mesons April 21, 2009
  arXiv:0904.3491by: Hilger, T. (Forschungszentrum Dresden Rossendorf) et al.Abstract: Pseudo-scalar and scalar $D$ mesons are considered within the QCD sum rule approach. We present an analysis of the mass splitting of the pseudo-scalar D - D-bar mesons and the relation to QCD condensates. Weinberg type sum rules are derived for chiral partners which highligh […]
• Role of four-quark condensates in QCD sum rules November 18, 2007
  arXiv:0711.2956Prog.Part.Nucl.Phys. 61 (2008) 297-303by: Thomas, R. (Forschungszentrum Dresden Rossendorf) et al.Abstract: The QCD sum rule approach to the in-medium behavior of hadrons is discussed for omega meson, nucleon and D meson. Emphasis is devoted to the impact of four-quark condensates and to order parameters of spontaneous symmetry breaking.