Thermal radiation and inclusive production in the CGC/saturation approach at high energies

Gotsman, E.; Levin, E.

doi:10.1140/epjc/s10052-019-6923-0

Cited by 12 publications

(23 citation statements)

References 60 publications

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“…α S denotes the running QCD coupling, ∇ 2 T the Laplace operator with respect to r, it is equal to ∇ 2 T = 1 r d dr r d dr . In our paper [2] we found that the main contribution at high energies stem from the specific kinematic region in the vicinity of the saturation scale. Indeed, at high energies and sufficiently small values of p T the dipole amplitudes are in the saturation region, where the parton densities are large and the dipole scattering amplitude displays geometric scaling behaviour, being a function of only one variable: τ = r Q s (W, b) [28][29][30].…”

Section: A General Formulaementioning

confidence: 57%

“…For completeness of presentation, in this subsection we give a brief review of our theoretical and phenomenological approach to the contribution of the dipole-nucleon scattering amplitude to the inclusive gluon production, that has been discussed in Ref. [2].…”

Section: B Dipole-nucleon Scattering Amplitudementioning

confidence: 99%

“…Ref. [2], checked that Eq. (15) describes to a good accuracy the exact solution for the non-linear Balitsky-Kovchegov [40] equation, for the leading twist BFKL kernel.…”

Section: B Dipole-nucleon Scattering Amplitudementioning

confidence: 99%

“…The main ideas of our approach have been discussed in our paper (see Ref. [2]) for hadron-hadron scattering at high energies. Here, we consider heavy ion collisions in which, we believe, the distinctive features of the CGC/saturation approach manifest themselves in the clearest way.…”

Section: Introductionmentioning

confidence: 99%

“…In Ref. [2] we discussed these corrections, but we do not take them into account, in Eq. (30) as we view N = N 0 τ 2γ as a phenomenological expression that describes the DIS data [15].…”

mentioning

confidence: 99%

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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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Section: A General Formulaementioning

confidence: 57%

Section: B Dipole-nucleon Scattering Amplitudementioning

confidence: 99%

“…Ref. [2], checked that Eq. (15) describes to a good accuracy the exact solution for the non-linear Balitsky-Kovchegov [40] equation, for the leading twist BFKL kernel.…”

Section: B Dipole-nucleon Scattering Amplitudementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…In Ref. [2] we discussed these corrections, but we do not take them into account, in Eq. (30) as we view N = N 0 τ 2γ as a phenomenological expression that describes the DIS data [15].…”

mentioning

confidence: 99%

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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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Saturation momentum scale extracted from semi-inclusive transverse spectra in high-energy pp collisions

Osada

Kumaoka

2019

Phys. Rev. C

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Geometric scaling is well confirmed for transverse momentum distributions observed in protonproton collisions at LHC energies. We introduced multiplicity dependence on a saturation momentum of the geometrical scaling, assuming the scaling holds for semi-inclusive distributions as well as for inclusive distributions. The saturation momentum is usually given by Bjorken's x variable, but redefinition of the scaling variable can make the saturation momentum a function of collision energy W . We treat the energy as a free parameter (denoted W * to distinguish it from W ) and associate the energy-dependent saturation momentum Qsat(W * ) with particle number density. By using Qsat(W * ) for a scaling variable τ , we show semi-inclusive distributions can be geometrically scaled. i.e., all semi-inclusive spectra observed at W =0.90, 2.76 and 7.00 TeV overlap one universal function. The particle density dependences of mean transverse momentum pT for LHC energies scales in terms of Qsat(W * ). Furthermore, our model explains a scaling property of event-by-event pT fluctuation measure √ Cm/ pT at LHC energies for pp collisions, where Cm is two-particle transverse momentum correlator. Our analysis of the pT fluctuation makes possible to evaluate a non-perturbative coefficient of the gluon correlation function.

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Thermal and hard scales in transverse momentum distributions, fluctuations, and entanglement

2021

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Thermal radiation and inclusive production in the CGC/saturation approach at high energies

Cited by 12 publications

References 60 publications

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

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

Saturation momentum scale extracted from semi-inclusive transverse spectra in high-energy pp collisions

Thermal and hard scales in transverse momentum distributions, fluctuations, and entanglement

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