Exotic hadrons from heavy ion collisions

Cho, Sungtae; Hyodo, Tetsuo; Jido, Daisuke; Ko, Che Ming; Lee, Su Houng; Maeda, Saori; Miyahara, Kenta; Morita, Kenji; Nielsen, M.; Ohnishi, Akira; Sekihara, Takayasu; Song, Taesoo; Yasui, Shigehiro; Yazaki, K.

doi:10.1016/j.ppnp.2017.02.002

Cited by 125 publications

(63 citation statements)

References 331 publications

(573 reference statements)

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“…energy for the production of a ssbb (sscb) at an electron-positron collider should be √ s > 22 ( √ s > 15) GeV. Of these exotic states, the production of the lowest T cc at various facilities (Tevatron, RHIC, LHC, KEK) has been considered [38][39][40][71][72][73][74]. Because of its clean background, the electron-positron collision experiment has its advantage in searching for T cc .…”

Section: Production and Decaymentioning

confidence: 99%

Exotic tetraquark states with the $$qq\bar{Q}\bar{Q}$$ q q Q ¯ Q ¯ configuration

et al. 2017

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In this work, we study systematically the mass splittings of the qqQQ (q = u, d, s and Q = c, b) tetraquark states with the color-magnetic interaction by considering color mixing effects and estimate roughly their masses. We find that the color mixing effect is relatively important for the J P = 0 + states and possible stable tetraquarks exist in the nnQQ (n = u, d) and nsQQ systems either with J = 0 or with J = 1. Possible decay patterns of the tetraquarks are briefly discussed.

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Section: Production and Decaymentioning

confidence: 99%

Exotic tetraquark states with the $$qq\bar{Q}\bar{Q}$$ q q Q ¯ Q ¯ configuration

et al. 2017

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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%

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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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“…[1], the success in describing yield of light nuclei in the SHM is taken to be a signature of a statistical formation rather than due to a coalescence of baryons. The argument is that in a coalescence picture the yield depends on the square of nuclear wave functions which vary widely between the various nuclei [24][25][26]. Such a view is not universally accepted.…”

Section: Introductionmentioning

confidence: 99%

Yields of weakly bound light nuclei as a probe of the statistical hadronization model

et al. 2019

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The statistical hadronization model successfully describes the yields of hadrons and light nuclei from central heavy ion collisions over a wide range of energies. It is a simple and efficient phenomenological framework in which the relative yields for very high energy collisions are essentially determined by a single model parameter-the chemical freeze-out temperature. Recent measurements of yields of hadrons and light nuclei covering over 9 orders of magnitudes from the ALICE collaboration at the LHC were described by the model with remarkable accuracy with a chemical freeze-out temperature of 156.5 ± 1.5 MeV. A key physical question is whether (at least to a good approximation) the freeze-out temperature can be understood, literally, as the temperature at which the various species of an equilibrated gas of hadrons (including resonances) and nuclei chemically freeze out as the model assumes, or whether it successfully parametrizes the yield data for a different reason. This paper analyzes the yields of weakly-bound light nuclei-the deuteron and the hypertriton-to probe this issue. Such nuclei are particularly sensitive to assumptions of the model because their binding energies are at a scale far below both typical hadronic scales and the freeze-out temperature. The analysis depends only on outputs of the statistical hadronization model, known hadronic properties and standard assumptions of kinetic theory while making no additional dynamical assumptions about the dynamics of heavy ion collisions. The analysis indicates that a key assumption underlying the model-that hadrons (and nuclei), just prior to chemical freeze-out temperature, are in thermal equilibrium and are sufficiently dilute as to have particle distributions accurately described statistically by a nearly ideal gas of hadrons and nuclei with masses given by their free space values-appears to be inconsistent with the chemical freeze-out temperature output by the model, at least for these weakly-bound nuclei. Implications of this analysis for the interpretation of parameters extracted from the model are discussed.

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Exotic hadrons from heavy ion collisions

Cited by 125 publications

References 331 publications

Exotic tetraquark states with the $$qq\bar{Q}\bar{Q}$$ q q Q ¯ Q ¯ configuration

Exotic tetraquark states with the $$qq\bar{Q}\bar{Q}$$ q q Q ¯ Q ¯ configuration

Update on J/ψ regeneration in a hadron gas

Yields of weakly bound light nuclei as a probe of the statistical hadronization model

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