scholarly journals In-medium hadronic spectral functions through the soft-wall holographic model of QCD

2012 ◽  
Vol 2012 (5) ◽  
Author(s):  
P. Colangelo ◽  
F. Giannuzzi ◽  
S. Nicotri
Keyword(s):  
Holographic Model ◽  
Spectral Functions ◽  
Soft Wall

scholarly journals Quarkonia Formation in a Holographic Gravity–Dilaton Background Describing QCD Thermodynamics

Particles ◽  
2021 ◽  
Vol 4 (2) ◽  
pp. 159-177
Author(s):  
Rico Zöllner ◽  
Burkhard Kämpfer
Keyword(s):  
Quark Mass ◽  
Heavy Ion ◽  
Mass Dependence ◽  
Holographic Model ◽  
Spectral Functions ◽  
Special Aspect ◽  
Quark Masses ◽  
Ion Collisions ◽  
Heavy Quark Mass ◽  
Quark Mass Dependence

A holographic model of probe quarkonia is presented, where the dynamical gravity–dilaton background was adjusted to the thermodynamics of 2 + 1 flavor QCD with physical quark masses. The quarkonia action was modified to account for the systematic study of the heavy-quark mass dependence. We focused on the J/ψ and Υ spectral functions and related our model to heavy quarkonia formation as a special aspect of hadron phenomenology in heavy-ion collisions at LHC.

scholarly journals The Effect of Higher Dimensional QCD Operators on the Spectroscopy of Bottom-Up Holographic Models

Universe ◽  
2021 ◽  
Vol 7 (4) ◽  
pp. 102
Author(s):  
Sergey Afonin
Keyword(s):  
Excited States ◽  
Normal Modes ◽  
Mass Range ◽  
Scalar Case ◽  
Holographic Model ◽  
Bottom Up ◽  
Higher Dimensional ◽  
Soft Wall ◽  
Holographic Approach ◽  
Meson States

Within the bottom-up holographic approach to QCD, the highly excited hadrons are identified with the bulk normal modes in the fifth “holographic” dimension. We show that additional states in the same mass range can appear also from taking into consideration the 5D fields dual to higher dimensional QCD operators. The possible effects of these operators have not been taken into account in virtually any phenomenological applications. Using the scalar case as the simplest example, we demonstrate that the additional higher dimensional operators lead to a large degeneracy of highly excited states in the soft wall holographic model, and in the hard wall holographic model, they result in a proliferation of excited states. The considered model can be viewed as the first analytical toy model predicting a one-to-one mapping of the excited meson states to definite QCD operators, to which they prefer to couple.

scholarly journals Meson spectrum for arbitrary twist in soft-wall holographic model

2017 ◽  
Vol 32 (29) ◽  
pp. 1750155 ◽  
Author(s):  
S. S. Afonin
Keyword(s):  
Light Front ◽  
Holographic Model ◽  
Meson Spectrum ◽  
Soft Wall ◽  
Holographic Qcd ◽  
Light Mesons

The Regge spectrum of soft-wall holographic model is generalized to the case of arbitrary twist. Combining this result with the light-front holographic QCD, one arrives at a broad hydrogen-like degeneracy of the same sort as the degeneracy observed experimentally in the spectrum of light mesons.

scholarly journals Thermal properties of light mesons from holography

2021 ◽  
Vol 2021 (8) ◽  
Author(s):  
Xuanmin Cao ◽  
Songyu Qiu ◽  
Hui Liu ◽  
Danning Li
Keyword(s):  
Thermal Properties ◽  
High Temperature ◽  
Low Temperature ◽  
Correlation Functions ◽  
Axial Vector ◽  
Normal Modes ◽  
Temporal Correlation ◽  
Spectral Functions ◽  
Soft Wall ◽  
Light Mesons

Abstract The thermal properties of light mesons, including the temperature dependence of their masses (both screening and pole masses) and thermal widths, are studied in a two-flavor (Nf = 2) soft-wall AdS/QCD model. By solving the spatial correlation functions, we extract the screening masses (mscr) from their poles. The screening masses of pseudo-scalar (π) and axial-vector (a1) mesons increase almost monotonously with the increase of temperature. The screening masses of scalar (σ) and vector (ρ) mesons decrease at low temperature and increase at high temperature. The pole masses (mpole) and the thermal widths (Γ) are extracted from the temporal correlation functions and the corresponding spectral functions. The results indicate that the pole masses have local minima at low temperature and increase at high temperature. The thermal widths increase rapidly above the chiral crossover temperature Tcp, indicating the dissociations of mesons at high temperature. Furthermore, the degeneration of the chiral partners (π and σ, ρ and a1) above Tcp is observed from the screening and pole masses, revealing the chiral symmetry restoration at the hadronic spectrum level. Finally, we numerically verify that the spectral functions in the temporal regime are strongly related to the quasi-normal modes with complex frequencies ω0 = mpole− iΓ/2.

scholarly journals Towards reconciling the holographic and lattice descriptions of radially excited hadrons

2020 ◽  
Vol 80 (8) ◽  
Author(s):  
S. S. Afonin
Keyword(s):  
Excited States ◽  
High Energy ◽  
Holographic Model ◽  
Dual Theory ◽  
Wall Model ◽  
Consistency Test ◽  
Higher Dimensional ◽  
Soft Wall ◽  
Independent States ◽  
Kaluza Klein

Abstract Within the framework of AdS/QCD models, the spectra of radially excited hadrons are identified with towers of Kaluza–Klein (KK) states in a putative dual theory. The infinite number of KK states is indispensable to provide correct high energy asymptotics of correlation functions in QCD. It is known, however, that the KK modes of dual theory must be qualitatively different from real hadrons. And what is more important, the radially excited states appear in lattice calculations not as ”excitations” of some ground state, but rather as independent states coupled to higher dimensional QCD operators – the larger is a basis of interpolating operators, the larger set of states can be resolved. A question arises whether is it possible to reconcile the holographic and lattice descriptions of radially excited hadrons? We propose a new phenomenological ”consistency test” for bottom-up holographic models: If the KK spectrum of massive 5D fields dual to higher dimensional operators in QCD coincides with the conventional radial KK spectrum, then the holographic KK states can be identified with real excited mesons in the large-$$N_c$$Nc limit of QCD. We demonstrate that the Soft Wall holographic model passes this test while the Hard Wall model does not.

scholarly journals AnomalousAV*Vvertex function in the soft-wall holographic model of QCD

2012 ◽  
Vol 85 (3) ◽  
Author(s):  
P. Colangelo ◽  
F. De Fazio ◽  
J. J. Sanz-Cillero ◽  
F. Giannuzzi ◽  
S. Nicotri
Keyword(s):  
Holographic Model ◽  
Soft Wall

scholarly journals Soft wall holographic model for the minimal composite Higgs boson

2021 ◽  
Vol 103 (5) ◽  
Author(s):  
Domènec Espriu ◽  
Alisa Katanaeva
Keyword(s):  
Higgs Boson ◽  
Holographic Model ◽  
Composite Higgs ◽  
Soft Wall
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