scholarly journals Thermal modification of open heavy-flavor mesons from an effective hadronic theory

2022 ◽  
Vol 258 ◽  
pp. 04004
Author(s):  
Glòria Montaña
Keyword(s):  
D Mesons ◽  
Molecular Model ◽  
Transport Coefficients ◽  
Heavy Flavor ◽  
Imaginary Time ◽  
Spectral Functions ◽  
Heavy Mesons ◽  
Coupled Channels ◽  
Time Formalism ◽  
Quark Spin

We have developed a self-consistent theoretical approach to study the modification of the properties of heavy mesons in hot mesonic matter which takes into account chiral and heavy-quark spin-flavor symmetries. The heavylight meson-meson unitarized scattering amplitudes in coupled channels incorporate thermal corrections by using the imaginary-time formalism, as well as the dressing of the heavy mesons with the self-energies. We report our results for the ground-state thermal spectral functions and the implications for the excited mesonic states generated dynamically in the heavy-light molecular model. We have applied these to the calculation of meson Euclidean correlators and transport coefficients for D mesons and summarize here our findings.

scholarly journals Properties of heavy mesons at finite temperature

2020 ◽  
Author(s):  
Gloria Montaña ◽  
Angels Ramos ◽  
Laura Tolós
Keyword(s):  
Heavy Quark ◽  
Finite Temperature ◽  
Molecular Model ◽  
Scattering Problem ◽  
Spin Symmetry ◽  
Chiral Expansion ◽  
Leading Order ◽  
Heavy Mesons ◽  
Heavy Quark Mass ◽  
Quark Spin

We study the properties of heavy mesons using a unitarized approach in a hot pionic medium, based on an effective hadronic theory. The interaction between the heavy mesons and pseudoscalar Goldstone bosons is described by a chiral Lagrangian at next-to-leading order in the chiral expansion and leading order in the heavy-quark mass expansion so as to satisfy heavy-quark spin symmetry. The meson-meson scattering problem in coupled channels with finite-temperature corrections is solved in a self-consistent manner. Our results show that the masses of the ground-state charmed mesons D(0^-)D(0−) and D_s(1^-)Ds(1−) decrease in a pionic environment at T\neq 0T≠0 and they acquire a substantial width. As a consequence, the behaviour of excited mesonic states (D_{s0}^*(2317)^\pmDs0*(2317)± and D_0^*(2300)^{0,\pm}D0*(2300)0,±), generated dynamically in our heavy-light molecular model, is also modified at T\neq 0T≠0. The aim is to test our results against Lattice QCD calculations in the future.

scholarly journals Symmetries, Partners and Thresholds: The Case of the Xb

Symmetry ◽  
2021 ◽  
Vol 13 (9) ◽  
pp. 1600
Author(s):  
Pablo G. Ortega ◽  
David R. Entem ◽  
Francisco Fernández
Keyword(s):  
Spin Symmetry ◽  
Heavy Meson ◽  
Flavor Symmetry ◽  
Heavy Flavor ◽  
Coupled Channels ◽  
Quark Spin ◽  
Meson Spectroscopy ◽  
New States ◽  
Heavy Quark Spin Symmetry ◽  
Quark Models

The discovery of the X(3872) meant the revival of the heavy meson spectroscopy beyond naive qq¯ structures. Since the SU(3) scheme, which was very useful in the dawn of the quark models, does not work for these states, one has to use new symmetries, like Heavy Quark Spin Symmetry (HQSS) and Heavy Flavor Symmetry (HFS), to look for new states. However, at the energy regions where these new states appear, new factors are involved and it is not straightforward to relate the predictions of the symmetries with the data. In this work, we present a critical analysis of this problem and show, in a coupled-channels model, how the relative position of the bare QQ¯ states with respect to meson-meson thresholds and the coupling with other channels modulate the strength of the interaction and, hence, modify the structure of the predicted states. We found a possible candidate to the X(3872) partner at 10,599 MeV/c2.

scholarly journals Transport coefficients, spectral functions and the lattice

2002 ◽  
Vol 2002 (04) ◽  
pp. 053-053 ◽  
Author(s):  
Gert Aarts ◽  
Jose María Martínez Resco
Keyword(s):  
Transport Coefficients ◽  
Spectral Functions

Thermo field theory versus imaginary time formalism

1984 ◽  
Vol 141 (1-2) ◽  
pp. 83-87 ◽  
Author(s):  
Y. Fujimoto ◽  
R. Grigjanis ◽  
H. Nishino
Keyword(s):  
Field Theory ◽  
Imaginary Time ◽  
Time Formalism ◽  
Theory Versus

Understanding the unexpected suppression patterns at RHIC and LHC

2014 ◽  
Vol 29 (31) ◽  
pp. 1430035
Author(s):  
Magdalena Djordjevic ◽  
Marko Djordjevic
Keyword(s):  
Heavy Ion Collisions ◽  
D Mesons ◽  
Heavy Ion ◽  
Theoretical Framework ◽  
Relativistic Heavy Ion Collisions ◽  
Heavy Flavor ◽  
Major Goal ◽  
Neutral Pions ◽  
Single Electrons ◽  
Ion Collisions

Understanding properties of QCD matter created in ultra-relativistic heavy-ion collisions is a major goal of RHIC and LHC experiments. Suppression of light and heavy flavor observables is a powerful tool to understand these properties and the suppressions of underlying partons appear to suggest a clear hierarchy in the suppression of these observables. However, the measurements show significant qualitative differences between the observed and intuitively expected patterns, in particular for neutral pions and single electrons at RHIC and for charged hadrons and D mesons at LHC, which are denoted as heavy flavor puzzles at RHIC and LHC. In this review, we discuss these puzzles and also summarize evidence that they can be consistently explained within the same theoretical framework.

scholarly journals CHARMING BARYONS

2014 ◽  
Vol 26 ◽  
pp. 1460124
Author(s):  
C. GARCIA-RECIO ◽  
L. L. SALCEDO ◽  
D. GAMERMANN ◽  
J. NIEVES ◽  
O. ROMANETS ◽  
...  
Keyword(s):  
Heavy Quark ◽  
Spin Symmetry ◽  
Flavor Symmetry ◽  
Minimal Extension ◽  
Heavy Flavor ◽  
Vector Mesons ◽  
Quark Spin ◽  
Heavy Quark Spin Symmetry ◽  
Experimental Values

We study odd-parity baryonic resonances with one heavy and three light flavors, dynamically generated by meson-baryon interactions. Special attention is paid to Heavy Quark Spin Symmetry (HQSS), hence pseudoscalar and vector mesons and baryons with Jπ = 1/2+ and 3/2+ are considered as constituent hadrons. For the hidden-charm sector ([Formula: see text]), the meson-baryon Lagrangian with Heavy Flavor Symmetry is constructed by a minimal extension of the SU(3) Weinberg-Tomozawa (WT) Lagrangian to fulfill HQSS, such that not new parameters are needed. This interaction can be presented in different formal ways: as a Field Lagrangian, as Hadron creation-annihilation operators, as SU(6)×HQSS group projectors and as multichannel matrices. The multichannel Bethe-Salpeter equation is solved for odd-parity light baryons, hidden-charm N and Δ and Beauty Baryons (Λb). Results of calculations with this model are shown in comparison with other models and experimental values for baryonic resonances.

Relativistic version of the imaginary-time formalism

1998 ◽  
Vol 87 (3) ◽  
pp. 433-444 ◽  
Author(s):  
V. D. Mur ◽  
B. M. Karnakov ◽  
V. S. Popov
Keyword(s):  
Imaginary Time ◽  
Relativistic Version ◽  
Time Formalism

scholarly journals Gluon spectral functions and transport coefficients in Yang-Mills theory

2014 ◽  
Vol 90 (9) ◽  
Author(s):  
Michael Haas ◽  
Leonard Fister ◽  
Jan M. Pawlowski
Keyword(s):  
Transport Coefficients ◽  
Spectral Functions ◽  
Yang Mills

scholarly journals Geometry of variational methods: dynamics of closed quantum systems

2020 ◽  
Vol 9 (4) ◽  
Author(s):  
Lucas Hackl ◽  
Tommaso Guaita ◽  
Tao Shi ◽  
Jutho Haegeman ◽  
Eugene Demler ◽  
...  
Keyword(s):  
Variational Methods ◽  
Time Evolution ◽  
Coherent States ◽  
Geometric Approach ◽  
Quantum Systems ◽  
Imaginary Time ◽  
Excitation Spectra ◽  
Spectral Functions ◽  
Geometric Framework ◽  
Gaussian States

We present a systematic geometric framework to study closed quantum systems based on suitably chosen variational families. For the purpose of (A) real time evolution, (B) excitation spectra, (C) spectral functions and (D) imaginary time evolution, we show how the geometric approach highlights the necessity to distinguish between two classes of manifolds: Kähler and non-Kähler. Traditional variational methods typically require the variational family to be a Kähler manifold, where multiplication by the imaginary unit preserves the tangent spaces. This covers the vast majority of cases studied in the literature. However, recently proposed classes of generalized Gaussian states make it necessary to also include the non-Kähler case, which has already been encountered occasionally. We illustrate our approach in detail with a range of concrete examples where the geometric structures of the considered manifolds are particularly relevant. These go from Gaussian states and group theoretic coherent states to generalized Gaussian states.

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