Eccentricity fluctuations make flow measurable in high multiplicity p-p collisions

Details Eccentricity fluctuations make flow measurable in high multiplicity p-p collisions Eccentricity fluctuations make flow measurable in high multiplicity p-p collisions

2009-11-23

arxiv.org/abs/0911.4400v2

Phys.Rev.Lett.104:102301,2010

Physics

High Energy Physics

High Energy Physics - Phenomenology

4 pages, 3 figures. v2 accepted by PRL

Scientific paper

10.1103/PhysRevLett.104.102301

Elliptic flow is a hallmark of collectivity in hadronic collisions. Its measurement relies on analysis techniques which require high event multiplicity and could be applied so far to heavy ion collisions only. Here, we delineate the conditions under which elliptic flow becomes measurable in the samples of high-multiplicity ($dN_{\rm ch}/dy \geq 50$) p-p collisions, which will soon be collected at the LHC. We observe that fluctuations in the p-p interaction region can result in a sizable spatial eccentricity even for the most central p-p collisions. Under relatively mild assumptions on the nature of such fluctuations and on the eccentricity scaling of elliptic flow, we find that the resulting elliptic flow signal in high-multiplicity p-p collisions at the LHC becomes measurable with standard techniques.

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