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Correlations between azimuthal asymmetries and multiplicity and mean transverse momentum in small collisions systems in the CGC

by Tolga Altinoluk, Néstor Armesto, Alex Kovner, Michael Lublinsky, Vladimir V. Skokov

Submission summary

As Contributors: Nestor Armesto
Arxiv Link: (pdf)
Date accepted: 2022-02-28
Date submitted: 2021-07-30 12:06
Submitted by: Armesto, Nestor
Submitted to: SciPost Physics Proceedings
Proceedings issue: DIS2021
Academic field: Physics
  • High-Energy Physics - Phenomenology
  • Nuclear Physics - Theory
Approaches: Theoretical, Phenomenological


Considering a dilute-dense situation suitable for pA collisions, we compute in the Color Glass Condensate the correlation between azimuthal asymmetries, specifically the squared second Fourier coefficient $v_2^2$, and the total multiplicity in the event. We also analyse the correlation between $v_2^2$ and the mean squared transverse momentum of particles in the event. In both cases, we find that the correlations are generally very small, consistent with the observations. We also note an interesting sharp change in the value of $v_2^2$ and its correlations as a function of the width of the transverse momentum bin, related with a change of the dominance of Bose and HBT quantum correlations.

Current status:
Publication decision taken: accept

Editorial decision: For Journal SciPost Physics Proceedings: Publish
(status: Editorial decision fixed and (if required) accepted by authors)

Submission & Refereeing History

Reports on this Submission

Anonymous Report 1 on 2022-2-8 (Invited Report)


Interesting and well-presented phenomenological results on flow harmonics in small systems from the CGC.

A couple of suggestions for Fig. 1, it would be good to include a label on the Y-axis of the left-hand plot. Additionally, it may make sense in the caption to make more clear which of the curves corresponds to which contribution, e.g
"a) the same momentum of the pair (solid line), b) the momentum of the pair is offset by the saturation momentum of the target
in order to avoid the gluon HBT effect (dashed line)" or some similar clarification.

  • validity: -
  • significance: -
  • originality: -
  • clarity: -
  • formatting: -
  • grammar: -

Author:  Nestor Armesto  on 2022-02-22  [id 2234]

(in reply to Report 1 on 2022-02-08)

We thank the Referee for her/his report. We have extended the caption of Fig. 1 in order to clarify the meaning of the lines in the plot on the left. We feel that with this clarification, no change in the plot itself is needed. We hope that with this change the manuscript is now acceptable for publication.

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