X (3872) production and absorption in a hot hadron gas

Abreu, L. M.; Khemchandani, Kanchan; Torres, A. Martínez; Navarra, F. S.; Nielsen, M.

doi:10.1016/j.physletb.2016.08.050

Cited by 57 publications

(87 citation statements)

References 51 publications

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“…We shall make use of the evolution equation for the abundances of particles included in processes discussed above. The momentum-integrated evolution equation has the form [37][38][39][40][41] …”

Section: Time Evolution Of the J/ψ Abundancementioning

confidence: 99%

“…We will assume that π,ρ,K,K * ,D, and D * are in equilibrium. Therefore, the density n i (τ ) can be written as [37][38][39][40][41] …”

Section: Time Evolution Of the J/ψ Abundancementioning

confidence: 99%

“…This number can be calculated with perturbative QCD and yields the charm quark fugacity factor γ C in Eq. (16) [37][38][39][40][41]. The total number of pions and ρ mesons at freeze-out was taken from Refs.…”

Section: Time Evolution Of the J/ψ Abundancementioning

confidence: 99%

“…The total number of pions and ρ mesons at freeze-out was taken from Refs. [39,42,43]. In the case of K ( * ) andK ( * ) mesons [40], we work with the assumption that strangeness reaches approximate chemical equilibrium in heavy ion collisions due to the short equilibration time in the quark-gluon plasma and the net strangeness of the QGP is zero.…”

Section: Time Evolution Of the J/ψ Abundancementioning

confidence: 99%

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Update on J/ψ regeneration in a hadron gas

et al. 2018

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In heavy-ion collisions, after the quark-gluon plasma there is a hadronic gas phase. Using effective Lagrangians, we study the interactions of charmed mesons which lead to J /ψ production and absorption in this gas. We update and extend previous calculations introducing strange meson interactions and also including the interactions mediated by the recently measured exotic charmonium resonances Z(3900) and Z (4025). These resonances open new reaction channels for the J /ψ, which could potentially lead to changes in its multiplicity. We compute the J /ψ production cross section in processes such as D ( * ) (s) +D ( * ) → J /ψ + (π,ρ,K,K * ) and also the J /ψ absorption cross section in the corresponding inverse processes. Using the obtained cross sections as input to solve the appropriate rate equation, we conclude that the interactions in the hadron gas phase lead to a 20-24% reduction of the J /ψ abundance. Within the uncertainties of the calculation, this reduction is the same at the Relativistic Heavy Ion Collider and the large Hadron Collider.

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Section: Time Evolution Of the J/ψ Abundancementioning

confidence: 99%

“…We will assume that π,ρ,K,K * ,D, and D * are in equilibrium. Therefore, the density n i (τ ) can be written as [37][38][39][40][41] …”

Section: Time Evolution Of the J/ψ Abundancementioning

confidence: 99%

Section: Time Evolution Of the J/ψ Abundancementioning

confidence: 99%

Section: Time Evolution Of the J/ψ Abundancementioning

confidence: 99%

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Update on J/ψ regeneration in a hadron gas

et al. 2018

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“…After being produced, the multiquark states interact with other hadrons during the expansion and cooling of the hadronic matter. They can be destroyed in collisions with the comovinglight mesons, but they can also be produced through the inverse processes [38][39][40][41][42]. The final multiplicity depends on the interaction cross sections, which, in turn, depend on the spatial configuration of the quarks.…”

Section: Introductionmentioning

confidence: 99%

$$Z_b(10610)$$ Z b ( 10610 ) in a hadronic medium

et al. 2018

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In this work we investigate the Z b (10610) (called simply Z b ) abundance in the hot hadron gas produced in heavy ion collisions after the quark-gluon plasma phase. We use effective Lagrangians to calculate the thermally averaged cross sections of Z b production in processes such as B ( * ) +B ( * ) → π + Z b (10610) and also of its absorption in the corresponding inverse processes. We then solve the rate equation to follow the time evolution of the Z b multiplicity. We find that, if we neglect the Z b decay, the number of Z b 's produced at the end of the quark-gluon plasma phase remains almost constant during the hadron phase. The introduction of the decay in the rate equation leads to a suppression in the final yield by a factor two.

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On the two-body decay processes of the predicted three-body K*(4307) resonance

Ren

Malabarba

Khemchandani

et al. 2019

J. High Energ. Phys.

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In a recent theoretical work, Phys. Lett. B785, 112 (2018), we proposed that a K * resonance with hidden charm content arises from the KDD * dynamics, where the DD * system is treated as a Z c (3900) or X(3872). With the motivation of determining its further properties, which can be observed in experiments, we now present a calculation of the decay processes of this K * , namely K * (4307), to two-body channels. Particularly, we consider the decay channels J/ψK * (892),DD s ,DD * s andD * D * s . The mechanisms of the decay to these channels involve triangular loops and are a consequence of the internal structure of the state. Thus, the values found for the decay widths of the proposed K * (4307) are related to its nature and should be valuable for carrying on an experimental study of the K * (4307). A K * state with such a mass (in the charmonium region) and quantum numbers is a clear manifestation of an exotic meson, since, having hidden charm (i.e., a cc pair), its mass and quantum numbers can not be explained within a quark-antiquark description.

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X (3872) production and absorption in a hot hadron gas

Cited by 57 publications

References 51 publications

Update on J/ψ regeneration in a hadron gas

Update on J/ψ regeneration in a hadron gas

$$Z_b(10610)$$ Z b ( 10610 ) in a hadronic medium

On the two-body decay processes of the predicted three-body K*(4307) resonance

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