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SUMMARY:Measurement of long-range azimuthal anisotropies in $pp$ and $p$+P
 b collisions with the ATLAS detector.
DTSTART;VALUE=DATE-TIME:20160523T153000Z
DTEND;VALUE=DATE-TIME:20160523T160000Z
DTSTAMP;VALUE=DATE-TIME:20190325T153837Z
UID:indico-contribution-1978383@indico.cern.ch
DESCRIPTION:Speakers: Brian Cole (Columbia University (US))\n(speaker know
 n later)\nATLAS measurements of correlations between particle pairs in rel
 ative\nazimuthal angle ($\\Delta\\phi$) and  pseudorapidity separation\n($
 \\Delta\\eta$)\, in $pp$ collisions at $\\sqrt{s}$=2.76\, 5.02 and\n13~TeV
 \, and in $p$+Pb collisions at $\\sqrt{s_{\\mathrm{NN}}}$=5.02~TeV\nare pr
 esented. Prior measurements have shown that in $pp$ collisions\nwith a lar
 ge multiplicity of produced particles\, a long-range\nstructure\,commonly 
 called the ``ridge''\, develops along $\\Delta\\eta$\nat $\\Delta\\phi\\si
 m$0. However\, due to the presence of the large\naway-side jet\, the full 
 $\\Delta\\phi$ dependence of the long-range\ncorrelation could not be stud
 ied previously. In this analysis\, a\ntemplate fitting procedure is implem
 ented to determine the\ncontributions from dijets to the correlations\, us
 ing low-multiplicity\nevents\, and extract the genuine long-range correlat
 ion. The Fourier\nharmonics of the genuine long-range correlation for orde
 rs $n$=2--4\nare extracted\, and their dependence on $p_{\\mathrm{T}}$\,\n
 event-multiplicity and collision energy are studied. It is shown that\nthe
  second Fourier coefficient\, $v_{2\,2}$\, dominates the long range\ncorre
 lation\, with small but significant contributions from $v_{3\,3}$\nand $v_
 {4\,4}$. The $v_{2\,2}$ is shown to factorize into the product of\nsingle-
 particle anisotropies $v_2$. A large $v_2$ is shown to be\npresent even in
  events with a small multiplicity of produced\nparticles\, implying that t
 he long-range correlations are not unique to\nrare high multiplicity event
 s\, but are present even in low\nmultiplicity $pp$ collisions. Comparisons
  to the $v_{n\,n}$ and $v_{n}$\nobtained when applying the template fittin
 g procedure to $p$+Pb\ncollisions are also presented. These measurements c
 an help determine\nif the long range correlations in $pp$ and $p$+Pb colli
 sions arise\nfrom similar mechanisms or not.\n\nhttps://indico.cern.ch/eve
 nt/469857/contributions/1978383/
LOCATION:Centro de Congressos\, Instituto Superior Técnico\, Alameda Camp
 us Grande Anfiteatro
URL:https://indico.cern.ch/event/469857/contributions/1978383/
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