Saturation physics and deuteron–gold collisions at RHIC

Jalilian‐Marian, Jamal; Kovchegov, Yuri V.

doi:10.1016/j.ppnp.2005.07.002

Cited by 364 publications

(210 citation statements)

References 247 publications

(879 reference statements)

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“…The large number of nucleons leads to high density of small-x gluons in the nuclear wave function, which, in turn, generates a hard scale Q s ≫ Λ QCD known as the parton saturation scale, justifying the use of perturbative QCD calculations. (For reviews of the saturation/Color Glass Condensate (CGC) physics see [29,30,31,32,33].) The fact that the quasi-classical approximation generates a hard scale justifying the approach indicates that it is not simply a "model" of QCD, but, in fact, it represents a limiting behavior of strong interactions at high energy.…”

Section: Introductionmentioning

confidence: 99%

Sivers function in the quasiclassical approximation

Kovchegov

Sievert

2014

Phys. Rev. D

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We calculate the Sivers function in semi-inclusive deep inelastic scattering (SIDIS) and in the Drell-Yan process (DY) by employing the quasi-classical Glauber-Mueller/ McLerran-Venugopalan approximation. Modeling the hadron as a large "nucleus" with non-zero orbital angular momentum (OAM), we find that its Sivers function receives two dominant contributions: one contribution is due to the OAM, while another one is due to the local Sivers function density in the nucleus. While the latter mechanism, being due to the "lensing" interactions, dominates at large transverse momentum of the produced hadron in SIDIS or of the di-lepton pair in DY, the former (OAM) mechanism is leading in saturation power counting and dominates when the above transverse momenta become of the order of the saturation scale. We show that the OAM channel allows for a particularly simple and intuitive interpretation of the celebrated sign flip between the Sivers functions in SIDIS and DY.

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Section: Introductionmentioning

confidence: 99%

Sivers function in the quasiclassical approximation

Kovchegov

Sievert

2014

Phys. Rev. D

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“…When considering proton-nucleus collisions with a particular impact parameter B, the proton is usually described by a classical color current [13] …”

Section: Single Gluon Production In Pa Collisions Beyond the Eikonal mentioning

confidence: 99%

Coherence effects between the initial and final state radiation in a dense QCD medium

Martínez

2014

Nuclear Physics A

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In these proceedings contribution we review our recent results of medium modifications to the coherence pattern between the initial and final state radiation. We study single gluon production off a highly energetic parton that undergoes a hard scattering and subsequently crosses a dense QCD medium of finite size. Multiple scatterings lead to a partial suppression of the interferences between different emitters that opens the phase space for large angle emissions. We briefly discuss the generalization of this setup to describe gluon production in the case of pA collisions by including finite length and energy corrections. The configuration studied here may have phenomenological consequences in high-energy nuclear collisions.

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“…Gluons in the proton are freed mainly through multiple scattering with the dense set of gluons in the nucleus. Because there are in general many scatterings as the gluon from the proton passes through the nucleus, k ⊥ -factorization is far from manifest [1,4,5,6,7,8,9]. The formula for gluon production, see (3) and (4) below, is very simple as is the picture of the production.…”

Section: Introductionmentioning

confidence: 99%

Pictures of Particle Production in Proton--Nucleus Collisions

Mueller¹

2016

Acta Phys. Pol. B

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Dedicated to Andrzej Bialas in honor of his 80th birthday.This work focuses on gluon(jet) production in dilute(proton)-dense(nucleus) collisions. Depending on the frame and gauge, gluon production can be viewed as a freeing of gluons coming from either the proton wave function or from the nucleus wave function. These (apparently) very different pictures must lead to the same result and the purpose of this paper is to see how that happens. The focus is on gluons having k ⊥ ∼ Q S or gluons in the scaling region k ⊥ /Q S 1. In the McLerran-Venugopalan(MV) model with k ⊥ ∼ Q S we are able to derive gluon production in a way that (graphically) manifestly shows k ⊥ -factorization in terms of the number density of gluons in the nuclear wave function. We presume that this picture, and k ⊥ -factorization, continues to hold in the presence of small-x evolution although we have not been able to explicitly verify this. Our result is in agreement with usual k ⊥ -factorization where the gluon number density of the nucleus does not appear in an explicit way.

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Saturation physics and deuteron–gold collisions at RHIC

Cited by 364 publications

References 247 publications

Sivers function in the quasiclassical approximation

Sivers function in the quasiclassical approximation

Coherence effects between the initial and final state radiation in a dense QCD medium

Pictures of Particle Production in Proton--Nucleus Collisions

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