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Vn RHIC L

. . 23 2013.

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:
­ Sorensen (RHIC, STAR)

­ Jia (LHC, ATLAS)

­ Alver ()

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-, . . (, sin - )
d3 N 1 d2 N E3= {1 2 v n cos n - r } 2 p t dp t dy n=1 dp

v n= cos n - r

v n= f n s

NN

,N

part

, A , B , , M , pT

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Elliptic flow fluctuations i Au Au collixions at S NN = 200 GeV

Sorenson(STAR collaboration)

(J.Phys. G34 (2007) S897)

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n harmonic reduced flow vector is defined as 1 1 qn , x = i cos n i q n , y = i sin n i M M

th

1 1 2 2 = 1 v 2n - 2v n g n y = 1 - v 2n g n 2 2
2 x 2 2 q Mv -1 n n 2 2 x

x qn k dN 1 = e 1 - 2 q n dq n x y k = 0,2 ,4 , ... y vn M qn v n M 1 2k 1 Ik 2 k! 2 x


2

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Here we consider n=2 case. If v 2 fluctuates : dN ' dN = dv 2 f v 2 where q 2 dq 2 q 2 dq2 f= 1
- v 2 - v 2 2 2 v2



2

e

2

2 v2

Eccentricity stand ad part , impact parameter b , N bin , N part ad multiplicity are calculated frm Monte -Carlo Glauber model tuned t reproduce multiplicity distribution of 200 GeV Au - Au collisions.

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Paul Sorenson, J.Phys. G34 (2007) S897

. 2. RHIC STAR . AuAu , s NN = 200 GeV. v 2 n b. q - . : , : EP PP ; v 2 n ; , v 2 b 1/ 3 , v 2= 0.034 part dN / dy

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Measurement of the distributions of event - by - event flow harmonics i Pb - Pb Collisions at S NN = 2.76 TeV with the ATLAS detedtor

Jiangyong Jia (on behalf of the ATLAS Collaboration)

( arXiv:1209.4232 [nucl-ex], 2012 )

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The event - by - event distributions of harmonic flow oefficients v n for n = 2 ­ 4 are measured i Pb - Pb collisions at S NN = 2.76 TeV with the ATLAS detector , using charged particles with pT 0.5 GeV ad 2.5. Two methods are used t obtain the EbE v
n

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Event-by-Event (EbE)
. 4. ATLAS () () ( ) 0-5% , -- , 6 , ( )

dN / d = A 1 2 v n cos n - n
n =2

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dN / d = A 1 2 v n cos n
n=2
Jiangyong Jia, arXiv:1209.4232 [nucl-ex]

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. 5. EbE vn n=2 (), n=3 () n =4 () [4]. -- , , 0-1% v2 , v3 and v4.

P v n =

v

-v n 2



e

2

2 n 2

2 , - response function , = v n
Jiangyong Jia, arXiv:1209.4232 [nucl-ex]



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Jiangyong Jia, arXiv:1209.4232 [nucl-ex]

. 2. ATLAS LHC , s NN = 2.76 TeV. v / v n N pT n =2 , n=3 n =4 . 4 / - 1 0.523 , . / 2 MC - KLN
n 2

part

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. 6. EbE v2-, 2 - ( ) MC-KLN ( )
Jiangyong Jia, arXiv:1209.4232 [nucl-ex]

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. 5 : : v n v 2 v n 2 n EP 2 EP v n : v n v n v n

2 vn

v 2 / v n = 4 / 1.13 n , .
Jiangyong Jia, arXiv:1209.4232 [nucl-ex]

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--E



bE vn- n = 2 - 4 Pb-Pb s NN =2.76 TeV.

--

vn ( 0-2%) v2 v3 v4.

--

RMS vn / v n Npart pT. , pT, , pT. , 0.34 v2 N part ~ 200 .

--

vn MC-KLN , .

Jiangyong Jia, arXiv:1209.4232 [nucl-ex]

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Flow, two-particle correlations and Initial geometry fluctuations
Burak Alver (CMS Heavy Ion West Meeting)

(3/26/2010)

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, Jia

, CMS




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