Anisotropic particle production and azimuthal correlations in high-energy pA collisions

Dumitru, Adrian; Giannini, Andre V.; Skokov, Vladimir

Anisotropic particle production and azimuthal correlations in high-energy pA collisions

Adrian Dumitru
(
- Baruch Coll. and
- CUNY, Graduate School - U. Ctr.
)
,
Andre V. Giannini
(
- Baruch Coll. and
- Sao Paulo U.
)
,
Vladimir Skokov
(
- Western Michigan U.
)

Mar 12, 2015

16 pages

e-Print:

1503.03897 [hep-ph]

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Abstract: (arXiv)

We summarize some recent ideas relating to anisotropic particle production in high-energy collisions. Anisotropic gluon distributions lead to anisotropies of the single-particle azimuthal distribution and hence to disconnected contributions to multi-particle cumulants. When these dominate, the four-particle elliptic anisotropy

c_2\{4\}

changes sign. On the other hand, connected diagrams for

m

-particle cumulants are found to quickly saturate with increasing

m

, a ``coherence'' quite unlike conventional ``non-flow'' contributions such as decays. Finally, we perform a first exploratory phenomenological analysis in order to estimate the amplitude

{\cal A}

of the

\cos(2\varphi)

anisotropy of the gluon distribution at small

x

, and we provide a qualitative prediction for the elliptic asymmetry from three-particle correlations,

c_2\{3\}

.

Note:

Combined write-up of the presentations by the authors at the Initial Stages 2014 Conference, Napa, 3-7 December 2014

anisotropy
gluon
angular distribution
angular correlation
correlation
coherence
asymmetry

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