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    • Many-Quark Interactions: Large-N Scaling and Contribution to Baryon MassesPeer reviewedOpen access 

      31 mai 2022, BUISSERET, Fabien; Willemyns, Cintia; Semay, Claude, CeREF Technique
      Article scientifique
      Starting from an effective Hamiltonian modeling, of a baryon made of N identical quarks in the large-N approach of QCD, we obtain analytical formulas, allowing to estimate the contributions of multiquark interactions to the baryon mass. The cases of vanishing (mass spectrum) and nonvanishing (baryon melting) temperatures are treated.

    • Meson spectrum in SU(N) gauge theories with quarks in higher representations: A check of Casimir scaling hypothesisPeer reviewedOpen access 

      01 juin 2020, BUISSERET, Fabien; Semay, Claude, CeREF Technique
      Article scientifique
      Gauge theories with gauge group and quarks belonging to arbitrary representations of SU(N) form a rich landscape of QCD-like theories, whose study can shed new light on the properties of confinement. Four cases are particularly worth of interest: quarks in the fundamental representation, quarks in the 2-indice (anti)symmetric representation and quarks in the adjoint representation. The last three ...

    • Relevance of glueball bound states in the Yang-Mills plasma within a many-body T-matrix approachPeer reviewedOpen access 

      26 juillet 2012, Cabrera, Daniel; Lacroix, Gwendolyn; BUISSERET, Fabien; Semay, Claude, HE Louvain en Hainaut
      Article scientifique
      The strongly coupled phase of Yang-Mills plasma with gauge group SU(3) is studied in a Tmatrix approach. The existence of lowest-lying glueballs, interpreted as bound states of two transverse gluons (quasi-particles in a many-body setup), is analyzed in a non-perturbative scattering formalism with the input of lattice-QCD static potentials. The relevance of the singlet and the (colored) octet ...

    • The SUSY Yang Mills plasma in a T-matrix approachPeer reviewedOpen access 

      12 août 2015, Lacroix, Gwendolyn; BUISSERET, Fabien; Semay, Claude, HE Louvain en Hainaut
      Article scientifique
      In this paper, the thermodynamic properties of N = 1 supersymmetric Yang–Mills theory with an arbitrary gauge group are investigated. In the confined range, we show that identifying the bound state spectrum with a Hagedorn one coming from noncritical closed superstring theory leads to a prediction for the value of the deconfining temperature Tc that agrees with recent lattice data. The deconfined ...

    • Thermodynamics of the quark-gluon plasma within a T-matrix approachPeer reviewedOpen access 

      24 juin 2015, Lacroix, Gwendolyn; Semay, Claude; BUISSERET, Fabien, HE Louvain en Hainaut
      Article scientifique
      The strongly coupled phase of the quark-gluon plasma (QGP) is studied here by resorting to a T -matrix formulation in which the medium is seen as a nonideal gas of quasiparticles (quarks, antiquarks, and gluons) interacting nonpertubatively. In the temperature range under study, (1–5)Tc, where Tc is the temperature of deconfinement, the interactions are expected to be strong enough to generate ...

    • Two- and three-body calculations within the dominantly orbital state methodPeer reviewedOpen access 

      14 mai 2013, Semay, Claude; BUISSERET, Fabien, HE Louvain en Hainaut
      Article scientifique
      The dominantly orbital state method allows a semiclassical description of quantum systems. At the origin, it was developed for two-body relativistic systems. Here, the method is extended to treat two-body Hamiltonians and systems with three identical particles, in D≥2 dimensions, with arbitrary kinetic energy and potential. This method is very easy to implement and can be used in a large variety of ...