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Torres, A. Martínez; Khemchandani, Kanchan; Navarra, F. S.; Nielsen, M.; Oset, E.

doi:10.1103/physrevd.89.014025

Cited by 19 publications

(6 citation statements)

References 38 publications

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“…[306,307], in Ref. [110], the cross section for the e + e − → (D * D * ) ± π ∓ reaction was calculated and it was shown that the experimental result is compatible with a J P = 1 + state with mass around 4025 MeV and small width, ∼ 30 MeV, and, thus, in line with the result in Ref. [56].…”

Section: Theoretical Explanations For Z +supporting

confidence: 68%

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QCD sum rules approach to the X, Y and Z states

Albuquerque

Dias

Khemchandani

et al. 2019

J. Phys. G: Nucl. Part. Phys.

115

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In the past decade, due to the experimental observation of many charmonium-like states, there has been a revival of hadron spectroscopy. In particular, the experimental observation of charged charmonium-like, Z c states, and bottomonium-like, Z b states, represents a challenge since they can not be accommodated within the naive quark model. These charged states are good candidates of either tetraquark or molecular states and their observation motivated a vigorous theoretical activity. This is a rapidly evolving field with enormous amount of new experimental information. In this work, we review the current experimental progress and investigate various theoretical interpretations of these candidates of the multiquark states. The present review is written from the perspective of the QCD sum rules approach, where we present the main steps of concrete calculations and compare the results with other approaches and with experimental data.

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Section: Theoretical Explanations For Z +supporting

confidence: 68%

“…This fact, together with the results of Refs. [110,306,307] could hint to a possible misinterpretation of the signal observed in Ref. [?…”

Section: Theoretical Explanations For Z +mentioning

confidence: 99%

QCD sum rules approach to the X, Y and Z states

Albuquerque

Dias

Khemchandani

et al. 2019

J. Phys. G: Nucl. Part. Phys.

115

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show abstract

“…The possible contribution of the Z c (4025) resonance in the e + e − → (D * D * ) ± π ∓ reaction was reanalyzed in Ref. [503].…”

Section: Production and Decay Patternsmentioning

confidence: 99%

The hidden-charm pentaquark and tetraquark states

et al. 2016

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In the past decade many charmonium-like states were observed experimentally. Especially those charged charmoniumlike Z c states and bottomonium-like Z b states can not be accommodated within the naive quark model. These charged Z c states are good candidates of either the hidden-charm tetraquark states or molecules composed of a pair of charmed mesons. Recently, the LHCb Collaboration discovered two hidden-charm pentaquark states, which are also beyond the quark model. In this work, we review the current experimental progress and investigate various theoretical interpretations of these candidates of the multiquark states. We list the puzzles and theoretical challenges of these models when confronted with the experimental data. We also discuss possible future measurements which may distinguish the theoretical schemes on the underlying structures of the hidden-charm multiquark states.

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“…However, as explained in Ref. [30], it is their corresponding widths that make possible their manifestation in the DD * and D * D * invariant mass distribution found in Refs. [25,29,34,35].…”

Section: B J/ψ Productionmentioning

confidence: 69%

“…In fact, as shown in Ref. [30], the invariant mass distribution found in Ref. [29] can be explained considering the I G (J P C ) = 1 − (2 ++ ) state with mass and width around 4000 and 90 MeV, respectively, which is generated as a consequence of the interaction of D * D * − c.c.…”

Section: B J/ψ Productionmentioning

confidence: 76%

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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Reanalysis of thee+e−→(D*

Cited by 19 publications

References 38 publications

QCD sum rules approach to the X, Y and Z states

QCD sum rules approach to the X, Y and Z states

The hidden-charm pentaquark and tetraquark states

Update on J/ψ regeneration in a hadron gas

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