Upload
aldon
View
28
Download
0
Embed Size (px)
DESCRIPTION
Bose-Einstein Correlations at fixed multiplicities in the quantum optical approach. N. Suzuki, Matsumoto Univ., Japan M. Biyajima, Shinshu Univ., Japan. Contents. 1.Introduction 2.Momentum distributions at fixed n 3.Formulation in the quantum optical approach 4.Data analysis - PowerPoint PPT Presentation
Citation preview
Bose-Einstein Correlations at fixed multiplicities
in the quantum optical approach
N. Suzuki, Matsumoto Univ., Japan
M. Biyajima, Shinshu Univ., Japan
Contents
1.Introduction2.Momentum distributions at fixed n3.Formulation in the quantum optical
approach4.Data analysis Multiplicity distribution BEC (q-long, q-side distributions )5.Summary
Semi-inclusive events
1.Introduction
Multiplicity distributionOne-particle momentum density Two-particle momentum density
If these distributions are constructed from the same data samples, Parameters on the BEC (cf. source radius, which is estimated from the 2-body BEC) are included in the multiplicity distribution.
2-particle Bose-Einstein correlation function
2.Momentum distributions in the semi-inclusive events
3. Formulation in the quantum-optical approach
3-1.Parametrization
3-2.Multiplicity distribution in the QO approach
The MD is approximately given by the Glauber-Lachs formula.
KNO scaling function
4.Data analysis (MD)
0 10 20 30 40 50 60 70 801.0E-04
1.0E-03
1.0E-02
1.0E-01ALICE 7TeV |η|<1
dataP(n)
nch
P(nch)
4-2. Analysis of BEC
ALICE collaboration Phys. ReV. D84,112044(2011) pp 7 TeV, |η|<1.2
q-side distribution :
q-long distribution :
0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8
0.9
1.0
1.1
1.2
1.3
1.4
1.5 C4(ql), kT=(0.2,0.3) ALICE 7TeV
dataBEC
ql
0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8
0.9
1.0
1.1
1.2
1.3
1.4
1.5 C10(ql), kT=(0.2-0.3) AL-
ICE 7TeV
DataBEC
ql
0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 10.8
0.9
1.0
1.1
1.2
1.3
1.4
1.5 C13(ql), kT=(0.3,0.4) ALICE 7TeV
DataBEC
ql
0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8
0.9
1.0
1.1
1.2
1.3
1.4
1.5 C17(ql), kT=(0.2,0.3)
ALICE 7TeV
DataBEC
ql
0.0 0.2 0.4 0.6 0.8 1.0 1.2 0.8
0.9
1.0
1.1
1.2
1.3
1.4
1.5 C4(qs), kT=(0.2,0.3)
ALICE 7TeV
dataBEC
qs
0.0 0.2 0.4 0.6 0.8 1.0 1.2 0.8
0.9
1.0
1.1
1.2
1.3
1.4
1.5 C10(qs), kT=(0.2,0.3)
ALICE 7TeV
Data
BEC
qs
0 0.2 0.4 0.6 0.8 1 1.20.8
0.9
1.0
1.1
1.2
1.3
1.4
1.5C13(qs), kT=(0.3,0.4)
ALICE 7TeV
DataBEC
qs
0 0.2 0.4 0.6 0.8 1 1.20.8
0.9
1.0
1.1
1.2
1.3
1.4
1.5 C17(qs), kT=(0.2,0.3)
ALICE 7TeV
DataBEC
qs
2 4 6 8 10 12 14 16 180.0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
Multiplicity dependence ofparameters in Cn(ql)
Rl
Rs
n
fm
2 4 6 8 10 12 14 16 180.0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
Multiplicity dependence ofparameters in Cn(qs)
Rl
Rs
n
fm
-4 -3 -2 -1 0 1 2 3 40
1
2
3
4
5
6
7
8dn/dy α=0.3
y
5. Summary
q-long distribution :