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Open charm mesons in a hot and dense medium

Open charm mesons in a hot and dense medium. L. Tolos 1 , A. Ramos 2 and T. Mizutani 3 1 FIAS (University of Frankfurt) 2 Universitat de Barcelona 3 Virginia Polytechnic Institute and State University Phys. Rev. C77 (2008) 015207. Hadrons@FAIR, FIAS June 25-27, 2008

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Open charm mesons in a hot and dense medium

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  1. Open charm mesons in a hot and dense medium L. Tolos1, A. Ramos2 and T. Mizutani3 1 FIAS (University of Frankfurt) 2 Universitat de Barcelona 3 Virginia Polytechnic Institute and State University Phys. Rev. C77 (2008) 015207 Hadrons@FAIR, FIAS June 25-27, 2008 Frankfurt, Germany Open charm mesons in a hot and dense medium

  2. Outline 1. Motivation 2. Model: Self-consistent coupled-channel approach for DN scatteringc(2593) and c(2800) are dynamically generated 3. Open-charm mesons in hot dense matter 4. Conclusions & Outlook Open charm mesons in a hot and dense medium

  3. but there are alternative explanations in terms of conventional hadronic models:  “comover” scattering: N. Armesto, A. Capella, PLB430 (1998) 23 R. Vogt, Phys. Reports 310 (1999) 197. B.Zhang, C.M.Ko, B.A.Li, Z.W.Lin, S.Pal, PRC65 (2002) 054909 W. Cassing, E.L. Bratkovskaya, S. Juchem, NPA674 (2000) 249 O. Lynnyk,E.L. Bratkovskaya,W. Cassing, H.Stöcker, NPA786 (2007) 183  statistical hadronization model: A. Andronic, P. Braun-Munzinger, K. Redlich, J. Stachel. PLB571 (2003) 36; NPA789 (2007) 334; Phys. Lett. B659 (2008) 149. Motivation I (experimental facts) 1. J/ suppression: it has been advocated as signature of QGP due to color screening T.Matsui and H. Satz, PLB 178 (1986) 416 NA50, NA60 Collaborations at CERN-SPS 2. Open-charm enhancement?: (due to medium modified properties of open charm mesons) NA50 Collaboration, M.C.Abreu et al., EPJ C14 (2000) 443 it would facilitate J/Y suppression but … recently invalidated from an improved discrimination of muons (promt vs. semi-leptonic decays ) by the NA60 collaboration. R. Shahoyan, J.Phys.G34 (2005) S1029 Open charm mesons in a hot and dense medium

  4. To understand these issues it is imperative to have a realistic picture of the properties of charmonia and open charm mesons in a hotnuclear environment. This is especially important for the conditions of the CBM@FAIR heavy ion experiment, where both density (r~1-2 fm-3) and temperature (T~100 MeV) are relevant parameters. Open charm mesons in a hot and dense medium

  5. Motivation II (theoretical issues) 1. DN interaction: similar features as the thoroughly studied Kbar N interaction. In the charm sector we also find a subthreshold I=0 resonance, the Lc(2593) (udc), that bears a strong resemblance to the L(1405) (uds). May the Lc(2593) be generated also dynamically, through a coupled-channel unitarized model? Is this model able to explain some of the newly observed charmed-baryon resonances at CLEO, Belle, BaBar? Open charm mesons in a hot and dense medium

  6. 2. Mean-field models: predict the D+,D-mass shift QCD sum rule: The in-medium mass shift is propotional to the mass of the charmed quark (mc) and the light meson q-qbar condensate: A. Hayashigashi, Phys. Let. B487, 96 (2000) P. Morath, W. Weise, S.H. Lee, 17 Autumn school on QCD, Lisbon 1999 (World Scientific, SIngapore, 2001) 2001 Quark Meson Coupling approach: Hadron interactions mediated by the exchange of scalar-isoscalar (s) and vector (r and w) medium modified mesons among the light constituent quarks. A.Sibirtsev, K.Tsushima, and A.W.Thomas, Eur. Phys. J. A6, 351 (1999) Nuclear Mean Field approach (NMFA):s- w model supplemented by chiral terms (of vector and scalar-isoscalar nature) A.Mishra, E.L. Brakovskaya, J. Schaffner-Bielich, S. Schramm, and H. Stoecker, PRC 70, 044904 (2004) Open charm mesons in a hot and dense medium

  7. 3. Spectral function models:  predict the full energy distribution of (dynamical approaches)the D+meson strength in a self- consistent coupled channel approach D self-energy with a SU(3) separable DN interaction with u, d, c content L. Tolós, J. Schaffner-Bielich, and A. Mishra, Phys. Rev.C 70, 025203 (2004) (T=0 MeV) L. Tolós, J. Schaffner-Bielich, and H. Stöcker, Phys. Lett. B635, 85 (2006) (finite T) D and Dbar self-energy with an improved SU(4) and chiral DN interaction J.Hofmann and M.F.M.Lutz, Nucl. Phys. A763, 90 (2005) M.F.M.Lutz, and C.L.Korpa, Phys. Lett. B 633,43 (2006) D self-energy using a revised SU(4) and chiral DN interaction, supplemented by an attractive scalar-isoscalar SDN [see talk of J. Nieves for an extension of the model to SU(8)] T. Mizutani, A. Ramos, Phys. Rev. C74, 065201 (2006) HERE: we extend the model to Dbar mesons and implement finite T effects Open charm mesons in a hot and dense medium

  8. Model: • Transition potential V built from the meson-baryon Lagrangian at lowest order V SU(4) symmetry broken by the use of physical masses. Coupled channels included in the DN sector (C=1, S=0):. Open charm mesons in a hot and dense medium

  9. T. Mizutani, A. Ramos, Phys. Rev. C74, 065201 (2006) = + V is also supplemented by a scalar-isoscalar interaction (SDN term) (from QCDSR) • 2. Unitarization: N/D method • equivalent to Bethe-Salpeter coupled-channel equations with on-shell amplitudes Tij = Vij + Vil GlTlj The loop function G is regularized with a cut-off L [adjusted to reproduce Lc(2593)] Model A: Model B: Open charm mesons in a hot and dense medium

  10. Free space DN amplitudes I=0 I=1 R. Mizuk et al. [Belle Collaboration] Phys.Rev.Lett.94, 122002(2005) Sc(2800), G~60 MeV The model generates the I=0 Lc(2595) and another resonance in I=1 around the nominal Sc(2800)! Open charm mesons in a hot and dense medium

  11. = + Tij = Vij + Vil GlTlj = + Tij(r) = Vij + VilGl(r)Tlj(r) = + Self-consistent coupled channels procedure Free space meson dressing Medium Pauli blocking and baryon dressing Dressed D meson: Open charm mesons in a hot and dense medium

  12. Loop function (depends on r and T) spectral density D-meson self-energy Open charm mesons in a hot and dense medium

  13. DN amplitudes in hot dense matter (r=r0) Open charm mesons in a hot and dense medium

  14. D meson spectral in hot and dense matter (r=r0) N-1 quasiparticle peak N-1 MD MD Open charm mesons in a hot and dense medium

  15. Evolution with density and temperature r=r0 r=2r0 Similar trend to previous finite temperature results: LT, J. Schaffner-Bielich and H. Stoecker PLB 635 (2006) 85 Open charm mesons in a hot and dense medium

  16. D optical potential DN interaction Free space: Medium (at T=0): Open charm mesons in a hot and dense medium

  17. _ D and D meson potentials Open charm mesons in a hot and dense medium

  18. _ We have performed a self-consistent coupled-channel calculation of the D and D self-energies in symmetric nuclear matter at finite temperature taking, as bare interaction, the SU(4) TW contribution supplemented by a DN term • In hot dense matter, c(2593) and c(2800) stay close to their free position but develop a remarkable width • The D meson spectral density shows a single pronounced peak at finite temperature that melts with increasing density • Up to 0 the low-density theorem is a good approximation for the DN, where the repulsive I=1 component dominates • Due to the distinct resonant structure of the interaction, temperature induces a stronger change in the properties of the D than the D meson _ _ Conclusions & Outlook Open charm mesons in a hot and dense medium

  19. Open questions? • J/ suppression • Open-charm enhancement • D-mesic nuclei Looking forward to check these predictions with data from CBM@FAIR ! Open charm mesons in a hot and dense medium

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