Impact of a thermal medium on D mesons and their chiral partners

Montaña, Glòria; Ramos, À.; Tolós, Laura; Torres-Rincón, Juan M.

doi:10.1016/j.physletb.2020.135464

Cited by 41 publications

(116 citation statements)

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“…We have indeed shown that the D * 0 (2300) 0,± , having basically a Dπ and D sK two-pole structure, and D * s0 (2317) ± , which is mainly a DK bound state at T = 0, get diluted as the temperature of the pion bath is increased. We will further discuss these results in a future paper [13]. It is interesting to note that the dilution of these excited states results from the relatively strong interaction of the charmed mesons with pions.…”

Section: Discussionmentioning

confidence: 79%

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Properties of heavy mesons at finite temperature

Montaña

Ramos

Tolós

2020

SciPost Phys. Proc.

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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.

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Section: Discussionmentioning

confidence: 79%

“…We note that the lower modification with temperature of the D s -meson with respect to the D-meson is basically related to its weaker interaction with pions, as the D s π interaction vanishes at LO (see [13] for more details).…”

Section: Spectral Functions Of Ground-state Heavy Mesons At T =mentioning

confidence: 93%

Properties of heavy mesons at finite temperature

Montaña

Ramos

Tolós

2020

SciPost Phys. Proc.

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“…The leading thermal effect is an increase of the resonance width [27,29] due to Bose-Einstein enhancement of the bosonic channels to which it can decay, but with increasing temperature the particle masses are also affected. This m i (T ), Γ i (T ) behavior is already known [30][31][32] for the π, D * − , D * 0 , D 0 needed in our examples (Table 1; for Γ K * we provide an educated guess), and we can directly study its influence on the triangle I .…”

Section: A Debatable Singularity In Specific Configurations Of X Productionmentioning

confidence: 72%

“…The peak of the singularity is sharpest at T = 0: as temperature increases, the peak diminishes in height and shifts to smaller J/ψπ + π − invariant mass m C , accompanying the drop of the D * 0 D 0 threshold. At even higher T , the structure seems to Table 1 Input meson thermal masses and widths [30][31][32] for increasing temperatures, all in GeV. We exclude m π , practically constant and with modification of unclear sign [33][34][35].…”

Section: A Debatable Singularity In Specific Configurations Of X Productionmentioning

confidence: 99%

Heating triangle singularities in heavy ion collisions

Abreu

Llanes-Estrada

2021

Eur. Phys. J. C

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We predict that triangle singularities of hadron spectroscopy can be strongly affected in heavy ion collisions. To do it we examine various effects on the singularity-inducing triangle loop of finite temperature in the terminal hadron phase. It appears that peaks seen in central heavy ion collisions are more likely to be hadrons than rescattering effects under two conditions. First, the flight-time of the intermediate hadron state must be comparable to the lifetime of the equilibrated fireball (else, the reaction mostly happens in vacuo after freeze out). Second, the medium effect over the triangle-loop particle mass or width must be sizeable. When these (easily checked) conditions are met, the medium quickly reduces the singularity: at T about 150 MeV, even by two orders of magnitude, acting then as a spectroscopic filter.

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“…The last case represents a novel situation which was considered at finite temperature for the first time in References [47,48]. In the present review I will address this system and speculate about how the chiral symmetry restoration can be reflected where three different masses evolve with temperature toward the chiral symmetry restoration point.…”

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confidence: 96%

Degeneracy Patterns of Chiral Companions at Finite Temperature

Torres-Rincón

2021

Symmetry

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Chiral symmetry represents a fundamental concept lying at the core of particle and nuclear physics. Its spontaneous breaking in vacuum can be exploited to distinguish chiral hadronic partners, whose masses differ. In fact, the features of this breaking serve as guiding principles for the construction of effective approaches of QCD at low energies, e.g., the chiral perturbation theory, the linear sigma model, the (Polyakov)–Nambu–Jona-Lasinio model, etc. At high temperatures/densities chiral symmetry can be restored bringing the chiral partners to be nearly degenerated in mass. At vanishing baryochemical potential, such restoration follows a smooth transition, and the chiral companions reach this degeneration above the transition temperature. In this work I review how different realizations of chiral partner degeneracy arise in different effective theories/models of QCD. I distinguish the cases where the chiral states are either fundamental degrees of freedom or (dynamically-generated) composed states. In particular, I discuss the intriguing case in which chiral symmetry restoration involves more than two chiral partners, recently addressed in the literature.

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Impact of a thermal medium on D mesons and their chiral partners

Cited by 41 publications

References 42 publications

Properties of heavy mesons at finite temperature

Properties of heavy mesons at finite temperature

Heating triangle singularities in heavy ion collisions

Degeneracy Patterns of Chiral Companions at Finite Temperature

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