Two-particle azimuthal harmonics in pA collisions

Davy, Manyika Kabuswa; Marquet, Cyrille; Shi, Yu; Xiao, Bo-Wen; Zhang, Cheng

doi:10.1016/j.nuclphysa.2018.11.001

Cited by 17 publications

(21 citation statements)

References 96 publications

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“…Therefore, in this case both colliding objects can be treated in the CGC 10 Here we refer to gluon production which is the dominant mechanism at small x or high energies. 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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“…Following we can define v n (p T ) by integrating over k 1 and letting k 2 free as in [56], that is,…”

Section: Azimuthal Harmonicsmentioning

confidence: 99%

Effect of non-eikonal corrections on azimuthal asymmetries in the color glass condensate

2019

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We analyse the azimuthal structure of two gluon correlations in the Color Glass Condensate including those effects that result from relaxing the shockwave approximation for the target. Working in the Glasma graph approach suitable for collisions between dilute systems, we compute numerically the azimuthal distributions and show that both even and odd harmonics appear. We study their dependence on model parameters, energy of the collision, pseudorapidity and transverse momentum of the produced particles, and length of the target. While the contribution from noneikonal corrections vanishes with increasing collision energy and becomes negligible at the energies of the Large Hadron Collider, it is found to be sizeable up to top energies at the Relativistic Heavy Ion Collider.

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“…where ξ 2 is a parameter with dimensions of momentum squared. This choice, although it does not maintain some important properties of the Lipatov vertices, it is much simpler to deal with and, as we show in Appendix C, it is equivalent to using the Wigner function approach [44,45,64,65,94] but including quantum correlations in the projectile wave function. Thus, for two partons in the projectile the joint Wigner function that we use reads…”

Section: Resultsmentioning

confidence: 99%

“…Therefore, admittedly the validity of our approach is reduced to the forward region but not yet near the proton fragmentation one. In this region, the projectile partons are defined in terms of Wigner functions (see [44,45,64,65,94]). However, we would like to emphasize that the Wigner functions adopted in these references are factorized for two partons and do not include quantum correlations in the projectile.…”

Section: Resultsmentioning

confidence: 99%

“…We use the Golec-Biernat-Wüsthoff (GBW) model [60,61] for the target, and the generalised McLerran-Venugopalan (MV) model [62,63] for the projectile. In order to push the analytical calculations as far as possible, we employ the Wigner function ansatz used in [45,64,65] but extended to include quantum correlations in the projectile wave function. Due to the Gaussian forms that we employ for both the Wigner function and dipole, our results cannot be considered reliable for transverse momenta sizeably larger than the saturation scale.…”

Section: Introductionmentioning

confidence: 99%

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Multi-particle production in proton–nucleus collisions in the color glass condensate

2021

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We compute multi-gluon production in the Color Glass Condensate approach in dilute-dense collisions, $$\hbox {p}A$$ p A , extending previous calculations up to four gluons. We include the contributions that are leading in the overlap area of the collision but keep all orders in the expansion in the number of colors. We develop a diagrammatic technique to write the numerous color contractions and exploit the symmetries to group the diagrams and simplify the expressions. To proceed further, we use the McLerran–Venugopalan and Golec–Biernat–Wüsthoff models for the projectile and target averages, respectively. We use a form of the Lipatov vertices that leads to the Wigner function approach for the projectile previously employed, that we generalise to take into account quantum correlations in the projectile wave function. We provide analytic expressions for integrated and differential two gluon cumulants and show a smooth dependence on the parameters defining the projectile and target Wigner function and dipole, respectively. For four gluon correlations we find that the second order four particle cumulant is negative, so a sensible second Fourier azimuthal coefficient can be defined. The effect of correlations in the projectile on this result results qualitatively and quantitatively large.

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Two-particle azimuthal harmonics in pA collisions

Cited by 17 publications

References 96 publications

Particle correlations from the initial state

Particle correlations from the initial state

Effect of non-eikonal corrections on azimuthal asymmetries in the color glass condensate

Multi-particle production in proton–nucleus collisions in the color glass condensate

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