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Flow and Ridge phenomena from the CMS
V.L. Korotkikh (SINP MSU) for the CMS collaboration
Content · High Harmonics of Fourier decomposition · V3-V5 in ultra centrality PbPb collisions · Azimuthal anisotropy at high pT · High Harmonics in FLOW and RIDGE
Talks at Quark Matter 2012 International Conference , http://qm2012.bnl.gov/ Steve Sanders, Shengquan Tuo, Wei Li, Victoria Zhukova, Eric Appelt, Rylan Conway


Flow in Heavy Ion Collisions

1 2v2 ( pT , , s ) cos 2(i 2 )
Slide graphic taken WeyLi's ECT 2012 talk

Very good description at low pT by hydrodynamic approach with small viscosity of QGP /s = 0.08-0.16
Shen et al., PRC84 (2011) 044903 Close to lower quantum limit 1/4

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ICSSNP, Russian Academy of Sciences, 12-16 Nov 2012, MEPhI, Moscow, Russia

Vladimir Korotkikh,"Flow and Ridge at CMS"


Ridge effect in pp and HI collisions
RHIC, Au-Au, 200 GeV CMS LHC, p-p, 7000 GeV

JHEP 1009:091,2010

Vladimir Korotkikh,"Flow and Ridge at CMS"

ICSSNP, Russian Academy of Sciences, 12-16 Nov 2012, MEPhI, Moscow, Russia

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Ridge in pPb collisions (2012)
Ridge seen in high multiplicity pPb collisions at N>110!

CMS Coll., arXiv:1210.5482

Slide taken Velicanus's HotQuarks 2012 talk

Average over ridge region (2<||<4)
ICSSNP, Russian Academy of Sciences, 12-16 Nov 2012, MEPhI, Moscow, Russia

Vladimir Korotkikh,"Flow and Ridge at CMS"

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Ridge in PbPb at high pT (2012)

Slide taken WeyLi's INTRidje 2012 talk

Vladimir Korotkikh,"Flow and Ridge at CMS"

ISNP, Russian Academy of Sciences, 12-16 Nov 2012, MEPhI, Moscow, Russia

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High harmonics in HI azimuthal anisotropy

Plots taken from WeyLi's INTRidje 2012 talk
ICSSNP, Russian Academy of Sciences, 12-16 Nov 2012, MEPhI, Moscow, Russia

Vladimir Korotkikh,"Flow and Ridge at CMS"

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High harmonics of Collective Flow

v3 and v4: weak centrality and dependence, v5 p
Vladimir Korotkikh,"Flow and Ridge at CMS"

T

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ICSSNP, Russian Academy of Sciences, 12-16 Nov 2012, MEPhI, Moscow, Russia


2-particles High harmonics in Ridge region
arXiv:1201.3158

arXiv:1201.3158
ISNP, Russian Academy of Sciences, 12-16 Nov 2012, MEPhI, Moscow, Russia

Vladimir Korotkikh,"Flow and Ridge at CMS"

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Elliptic and triangular flow V2 and V3

"Ridge" and "Shoulder" may be described by V2 and V3 contributions
Vladimir Korotkikh,"Flow and Ridge at CMS"
ICSSNP, Russian Academy of Sciences, 12-16 Nov 2012, MEPhI, Moscow, Russia

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Ridge in Ultra-Centrality collisions (2012)

CMS-PAS-HIN-12-011
Vladimir Korotkikh,"Flow and Ridge at CMS"
ICSSNP, Russian Academy of Sciences, 12-16 Nov 2012, MEPhI, Moscow, Russia

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V2{EP,gap} at high pT (2012)

Slide taken from Wey Li's INTRidje 2012 talk
Vladimir Korotkikh,"Flow and Ridge at CMS"

PRL 109 (2012) 022301
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ICSSNP, Russian Academy of Sciences, 12-16 Nov 2012, MEPhI, Moscow, Russia


Ridge in low and high pT regions

Slide taken from WeyLi's INTRidje 2012 talk
Vladimir Korotkikh,"Flow and Ridge at CMS"
ICSSNP, Russian Academy of Sciences, 12-16 Nov 2012, MEPhI, Moscow, Russia

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Possible origin of Ridge

Vladimir Korotkikh,"Flow and Ridge at CMS"

ICSSNP, Russian Academy of Sciences, 12-16 Nov 2012, MEPhI, Moscow, Russia

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Summary of High harmonic in Flow and Ridge
New observation of Ridge in pPb collisions · for N > 110 and for 1 < pT < 3 GeV/c New measurements of Vn in PbPb collisions · v3 and v4 weak centrality and - dependence · v5 pT2 New measurements of Vn in ultra-central collisions < 2 % · v3 larger than v2 for pT > 1 GeV/c; v5 > v2 for pT > 3 GeV/c New measurements of Vn in high pT up to 40 GeV/c · v2 gradual decrease above pT ~ 10 GeV/c (some percent up to pT = 40 GeV/c) · v3 and v4 are small above 20 GeV/c

Very interesting v3 result study: 1. It weakly depends on centrality in PbPb. 2. It dominates in ultra-central collisions collisions. 3. v2 and v3 may describe Ridge in PbPb collisions at pT < 3 GeV/c .
Vladimir Korotkikh,"Flow and Ridge at CMS"

Is it a common and not coincidental property of QGM ? What is a physical origin of it in Flow and Ridge phenomena ?
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ICSSNP, Russian Academy of Sciences, 12-16 Nov 2012, MEPhI, Moscow, Russia


Flow and Ridge phenomena at the CMS

Backup slides

Vladimir Korotkikh,"Flow and Ridge at CMS"

ISNP, Russian Academy of Sciences, 12-16 Nov 2012, MEPhI, Moscow, Russia

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Very high pT 2-particles correlations

pTtrig > 20 GeV/c 1
Slide taken from Sanders's QM2012 talk

CMS-PAS-HIN-12-010
Vladimir Korotkikh,"Flow and Ridge at CMS"
ICSSNP, Russian Academy of Sciences, 12-16 Nov 2012, MEPhI, Moscow, Russia

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Factorization in 2-particle correlatios

Vladimir Korotkikh,"Flow and Ridge at CMS"

ISNP, Russian Academy of Sciences, 12-16 Nov 2012, MEPhI, Moscow, Russia

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