Sequential suppression of quarkonia and high-energy nucleus-nucleus collisions

Dutta, Nirupam; Borghini, Nicolas

doi:10.48550/arxiv.1206.2149

Cited by 6 publications

(9 citation statements)

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“…As was known from the study of model potentials and has been emphasized recently in [1,[34][35][36][37], we find that the mixing of different vacuum Eigenstates due to the presence of a screened real part of the heavy quark potential V Q Q(r) is a significant contribution to the overall dynamics (Fig. 4).…”

Section: Discussionsupporting

confidence: 71%

“…Before investigating the fully stochastic evolution of Bottomonium in a static QGP medium we first wish to observe its behavior in the absence of thermal noise. This case, which is known very well from the study of purely real model potentials (see also [1,[34][35][36][37]), already allows us to observe an important contribution to the dynamics: state mixing. The vacuum Υ initial state is not an Eigenstate of the Hamiltonian with Debye screened potential.…”

Section: Pure Initial State Evolutionsupporting

confidence: 53%

“…Take the b b ground state in the vector channel, Upsilon, for example. When traveling in the QGP, it is not an Eigenstate of the in-medium Hamiltonian and thus will experience mixing with the excited states Υ and Υ , a phenomenon which has recently been emphasized in [1,[34][35][36][37]. In addition the thermal fluctuations in the medium will induce additional excitations and de-excitations between the different Bottomonium states along the time evolution.…”

Section: Bottomonium As Qgp Thermometermentioning

confidence: 99%

“…The idea of treating heavy quarkonium as an open-quantum system has received increasing attention in recent years [1,34,35,37,49,50]. The formalism originally developed in the context of condensed matter systems [51] is particularly suited to the study of Bottomonium since the intrinsic separation of scales allows a clear distinction between environment (QGP) and test system (Bottomonium) degrees of freedom.…”

Section: An Open-quantum Systems Viewpointmentioning

confidence: 99%

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A first look at Bottomonium melting via a stochastic potential

Rothkopf

2014

J. High Energ. Phys.

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Abstract:We investigate the phenomenon of Bottomonium melting in a thermal quarkgluon plasma using three-dimensional stochastic simulations based on the concept of openquantum systems. In this non-relativistic framework, introduced in [1], which makes close contact to the potentials derived in effective field theory, the bb system evolves unitarily under the incessant kicks by the constituents of the surrounding heat bath. In particular thermal fluctuations and the presence of a complex potential in the EFT are naturally related. An intricate interplay between state mixing and thermal excitations emerges as we show how non-thermal initial conditions of Bottomonium states evolve over time. We emphasize that the dynamics of these states gives us access to information beyond what is encoded in the thermal Bottomonium spectral functions. Assumptions underlying our approach and their limitations, as well as the refinements necessary to connect to experimental measurements under more realistic conditions are discussed.

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Section: Discussionsupporting

confidence: 71%

Section: Pure Initial State Evolutionsupporting

confidence: 53%

Section: Bottomonium As Qgp Thermometermentioning

confidence: 99%

Section: An Open-quantum Systems Viewpointmentioning

confidence: 99%

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A first look at Bottomonium melting via a stochastic potential

Rothkopf

2014

J. High Energ. Phys.

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“…Thus quarkonia melting can occur even when QGP temperature remains below T D . We mention that adiabatic evolution of quarkonia states has been discussed earlier for the cooling stage of QGP in relativistic heavy ion collisions in the context of sequential suppression of quarkonia states [5]. However, as far as we are aware, validity of adiabatic evolution during the thermalization stage has not been discussed earlier.…”

mentioning

confidence: 94%

Quarkonia disintegration due to time dependence of the qq̄ potential in relativistic heavy-ion collisions

Bagchi

Srivastava

2015

Mod. Phys. Lett. A

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Rapid thermalization in ultra-relativistic heavy-ion collisions leads to fast changing potential between a heavy quark and antiquark from zero temperature potential to the finite temperature one. Time dependent perturbation theory can then be used to calculate the survival probability of the initial quarkonium state. In view of very short time scales of thermalization at RHIC and LHC energies, we calculate the survival probability of J/ψ and Υ using sudden approximation. Our results show that quarkonium decay may be significant even when temperature of QGP remains low enough so that the conventional quarkonium melting due to Debye screening is ineffective.PACS numbers: PACS numbers: 11.27.+d, 14.40.Lb, 12.38.Mh Suppression of heavy quarkonia as a signal for the quark-gluon plasma phase in relativistic heavy-ion collisions has been investigated intensively since the original proposal by Matsui and Satz [1]. The underlying physical picture of this suppression is that due to deconfinment, potential between qq gets Debye screened, resulting in the swelling of quarkonia. If the Debye screening length of the medium is less than the radius of quarkonia, then qq may not form bound states, leading to melting of the initial quarkonium. Due to this melting, the yield of quarkonia will be suppressed. This was proposed as a signature of QGP and has been observed experimentally [2]. However, there are other factors too that can lead to the suppression of J/ψ because of which it has not been possible to use J/ψ suppression as a clean signal for QGP.In the above picture, suppression of quarkonia occurs when the temperature of QGP achieves a certain value, T D , so that the Debye screening melts the quarkonium bound state. Thus, if the temperature remains smaller than T D , so that Debye screening length remains larger than the quarkonia size, no suppression is expected. This type of picture is consistent with the adiabatic evolution of a quantum state under changing potential. Original quarkonia has a wave function appropriate for zero temperature potential between a q andq. If the environment of the quarkonium changes to a finite temperature QGP adiabatically, with Debye screened potential, the final state will evolve to the quarkonium state corresponding to the finite temperature potential. If temperature remains below T D , quarkonium wave function changes (adiabatically) but it survives as the quarkonium.We question this assumption of adiabatic evolution for ultra-relativistic heavy-ion collisions, such as at RHIC, and especially at LHC. At such energies, it is possible that thermalization is achieved in a very short time, about 0.25 fm for RHIC and even smaller about 0.1 fm for * Electronic address: partha@iopb.res.in † Electronic address: ajit@iopb.res.in LHC [3]. Even conservatively, thermalization is achieved within 1 fm as suggested by the elliptic flow measurements [4]. For J/ψ and even for Υ, typical time scale of qq dynamics will be at least 1-2 fm from the size of the bound state and the fact that qq have non-r...

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