Thermal width and gluo-dissociation of quarkonium in pNRQCD

Brambilla, Nora; Escobedo, Miguel Ángel; Ghiglieri, Jacopo; Vairo, Antonio

doi:10.1007/jhep12(2011)116

Cited by 141 publications

(159 citation statements)

References 76 publications

(122 reference statements)

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“…Here we mention that the applicability of nonrelativistic QCD (NRQCD) [16] on the lattice [17] to treat the b quark at finite temperature is motivated by the hierarchy of effective field theories formulated in Refs. [18][19][20][21]. We also emphasise that the use of NRQCD enhances the signature for quarkonium melting/survival, as it avoids several problems which have complicated the study of relativistic quarks in thermal equilibrium [22,23].…”

Section: Correlatorsmentioning

confidence: 95%

Melting of P wave bottomonium states in the quark-gluon plasma from lattice NRQCD

Aarts

Allton

Kim

et al. 2013

J. High Energ. Phys.

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Section: Correlatorsmentioning

confidence: 95%

Melting of P wave bottomonium states in the quark-gluon plasma from lattice NRQCD

Aarts

Allton

Kim

et al. 2013

J. High Energ. Phys.

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“…This result was also found in [18] using different techniques. More details about gluo-dissociation in pNRQCD can be found in [8].…”

Section: Gluo-dissociationmentioning

confidence: 99%

“…The case T ∼ 1/r was studied in muonic hydrogen [7]. In this work we are going to focus on the recent investigations that have been done to translate the previous results in terms of cross sections [8,9]. Opposite to what happens to the decay width these cross sections do not depend on the nature of the medium as long as it is isotropic and homogeneous, so they can be directly applied to mediums with a finite chemical potential as the one that is expected to be formed in CBM.…”

Section: Introductionmentioning

confidence: 99%

The relation between cross section, decay width and imaginary potential of heavy quarkonium in a quark–gluon plasma

Escobedo

2013

Nuclear Physics A

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Abstract. Heavy quarkonium suppression was proposed long ago as a signal of the formation of a deconfined phase in heavy ion collisions. Originally the mechanism responsible for this suppression was thought to be color screening. However perturbative computations and recent lattice studies suggest the existence of an imaginary part of the potential which could have a more important role for suppression than screening. In this work we review some general aspects of effective field theories for heavy quarkonium in the medium and discuss the physical phenomena behind the imaginary part of the potential and the decay width of heavy quarkonium and their corresponding cross sections. IntroductionHeavy quarkonium is a meson formed by two heavy quarks whose mass m Q is much bigger than Λ QCD . They are quite different to other mesons. The first difference is that a lot of the physics relevant to study this system happens at a energy scale m Q where perturbation theory is applicable. For example the typical size of the more deeply bounded quarkonium states is of order 1/(m Q v), where v is the velocity of the heavy quarks around the center of mass, while for other mesons the size is of order 1/Λ QCD . A second difference is that heavy quarkonium is a non-relativistic system, meaning that v ≪ 1. For this reason it is expectable that at some accuracy it can be described by a Schrödinger equation with some potential, hence we can say that it is the QCD analogous to the hydrogen atom. On the other hand this small v can spoil naive perturbation theory in a way that will be discussed later.The original idea of using quarkonium suppression as a probe of deconfinement in heavy ion collisions is found in [1]. Since then this phenomena has been studied experimentally in many facilities, as for example SPS, RHIC and LHC. In the future the CBM experiment will be able to probe the situation when the quark-gluon plasma has a large chemical potential. Even though quarkonium suppression is a well established experimental fact an understanding of the responsible mechanism and a quantitative description of experimental data is still missing.The dissociation mechanism that was originally considered in [1] was color screening. In order to illustrate this mechanism we can make use of what happens in the perturbative limit of QCD. There the potential between two infinitely heavy color charges in the vacuum will have the form of a Coulomb potential V (r) = − α r . Then the two heavy charges will feel an attractive

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“…Imaginary part of the potential generated by the interaction with the surrounding medium was also introduced in [12], however this mechanism is significantly different from ours, and the break-up cross section is much smaller. The transition of a color-singletcc to a color-octet occurs due to direct absorption of a gluon from the medium [13].…”

Section: Introduction: Melting Vs Absorptionmentioning

confidence: 57%

Survival of charmonia in a hot environment

et al. 2015

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A colorlesscc dipole emerging from a heavy ion collision and developing the charmonium wave function can be broken-up by final state interactions (FSI) propagating through the hot medium created in the collision. We single out two mechanisms of charmonium attenuation: (i) Debye color screening, called melting; and (ii) color-exchange interaction with the medium, called absorption. The former problem has been treated so far only for charmonia at rest embedded in the medium, while in practice their transverse momenta at the LHC are quite high, p 2 T = 7 − 10 GeV 2 . We demonstrate that acc dipole may have a large survival probability even at infinitely high temperature. We develop a procedure of Lorentz boosting of the Schrödinger equation to a moving reference frame and perform the first realistic calculations of the charmonium survival probability employing the path-integral technique, incorporating both melting and absorption. These effects are found to have comparable magnitudes. We also calculated the FSI suppression factor for the radial excitation ψ(2S) and found it to be stronger than for J/ψ, except large pT , where ψ(2S) is relatively enhanced. The azimuthal asymmetry parameter v2 is also calculated.

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Thermal width and gluo-dissociation of quarkonium in pNRQCD

Cited by 141 publications

References 76 publications

Melting of P wave bottomonium states in the quark-gluon plasma from lattice NRQCD

Melting of P wave bottomonium states in the quark-gluon plasma from lattice NRQCD

The relation between cross section, decay width and imaginary potential of heavy quarkonium in a quark–gluon plasma

Survival of charmonia in a hot environment

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