CGC/saturation approach: re-visiting the problem of odd harmonics in angular correlations

Gotsman, E.; Levin, E.

doi:10.1140/epjc/s10052-018-6257-3

Cited by 2 publications

(2 citation statements)

References 114 publications

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“…Quarks, obeying Fermi-Dirac statistics and belonging to a non-real colour representation, can give rise to odd harmonics as investigated in [60,77,78]. 11 Besides, the role of the centrality or multiplicity event selection for the breaking of the accidental symmetry and the appearance of odd azimuthal harmonics has been analysed in [79].…”

Section: Subeikonal Corrections In the Cgcmentioning

confidence: 99%

Particle correlations from the initial state

Altinoluk

Armesto

2020

Eur. Phys. J. A

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The observation in small size collision systems, pp and pA, of strong correlations with long range in rapidity and a characteristic structure in azimuth, the ridge phenomenon, is one of the most interesting results obtained at the large hadron collider. Earlier observations of these correlations in heavy ion collisions at the relativistic heavy ion collider are standardly attributed to collective flow due to strong final state interactions, described in the framework of viscous relativistic hydrodynamics. Even though data for small size systems are well described in this framework, the applicability of hydrodynamics is less well grounded and initial state based mechanisms have been suggested to explain the ridge. In this review, we discuss particle correlations from the initial state point of view, with focus on the most recent theoretical developments.

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Section: Subeikonal Corrections In the Cgcmentioning

confidence: 99%

Particle correlations from the initial state

Altinoluk

Armesto

2020

Eur. Phys. J. A

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“…These initial conditions lead to different solutions for dipolehadron and dipole-nucleus amplitude in the saturation region (see Refs. [47][48][49][50]). In particular, for ξ < 0, where we expect geometric scaling behaviour of the scattering amplitude, and for ξ > 0 and no such behaviour is seen.…”

Section: Dipole-nucleus Scattering Amplitudementioning

confidence: 99%

Thermal radiation and inclusive production in the Kharzeev-Levin-Nardi model for ion-ion collisions

Gotsman

Levin

2019

Phys. Rev. D

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We show that in order to obtain a successful description of the transverse momenta distribution for charged particles in ion-ion collisions, one must include a thermal emission term. The temperature of this emission T th turns out to be proportional to the saturation scale, T th = 1.8/2π Qs. The formalism for the calculation of the transverse momenta spectra in CGC/saturation approach is developed, in which two stages of the process are seen: creation of the colour glass condensate, and hadronization of the gluon jets. Our calculations are based on the observation that even for small values of pT , the main contribution in the integration over the dipole sizes stems from the kinematic region in vicinity of the saturation momentum, where theoretically, we know the scattering amplitude. Non-perturbative corrections need to be included in the model of hadronization. This model incorporates the decay of a gluon jet with effective mass m 2 eff = 2Qsµ soft where µ soft denotes the soft scale, with the fragmentation functions at all values of the transverse momenta.We use the KLN model which, provides a simple way to estimate the cross sections for the different centrality classes. Comparing the results of this paper with the transverse distribution in the protonproton scattering, we see two major differences. First, a larger contribution of the thermal radiation term is needed, in accord with higher parton densities of the produced colour glass condensate. Second, even changing the model for the hadronization, without a thermal radiation term, we fail to describe the pT spectrum. Consequently, we conjecture that the existence of the thermal radiation term is independent of the model of confinement. PACS numbers: 12.38.Cy, 12.38g,24.85.+p,25.30.Hm * We have to mention, that actually the model of hadronization with given fragmentation function describes the experimental data at large values of p T (p T ≥ 3 GeV [7] and p T ≥ 5 GeV [38]). In our model of the hadronization we assume that we can describe the data with the fragmentation function at any value of p T . We will demonstrate that such a description is possible.

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CGC/saturation approach: re-visiting the problem of odd harmonics in angular correlations

Cited by 2 publications

References 114 publications

Particle correlations from the initial state

Particle correlations from the initial state

Thermal radiation and inclusive production in the Kharzeev-Levin-Nardi model for ion-ion collisions

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