Transverse momentum vs. multiplicity correlations
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Transcript of Transverse momentum vs. multiplicity correlations
Transverse momentum vs. multiplicity correlations
Agnieszka Wojtaszek-SzwarcJan Kochanowski University
NA61/SHINE and NA49 meeting in Warsaw 10-14.02.2014
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Analysis of pT - <N> correlation
• Pb+Pb collision at 158, 80, 40, 30 and 20A GeV• Only forward rapidity tracks 1.1< yCMS < 2.6,
(rapidity is calculated assuming pion mass for all particles) with 0.005< pT <1.5 GeV/c have been used in this analysis.
• Analysis have been done in narrow centrality bins
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Example of pT - N correlations
NNbap
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Pb+Pb at 160A GeV
Centrality 3.5% – 4.0%
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b parameter vs. centrality – all charged particles
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b parameter vs. centrality – negatively charged particles
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b parameter vs. centrality – positively charged particles
NNbap
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VENUS dataPb + Pb 158A GeV
4 centrality bins – 25 k events in each bin
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<pT> vs. N , negatively charged particles. MC data Pb+Pb at 158A GeV. Collision parameter 1 fm < b <1.5 fm. 0.005 < pT < 1.5 4.0 < y < 5.5
VENUS + acceptaneb = 3.21 1.0
VENUS + reconstruction + acceptanceb = 3.81 1.1
NNbap
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VENUS – top panelsVENUS + acceptance – bottom panels
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VENUS + reconstruction – top panelsVENUS + reconstruction + acceptance – bottom panels
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Negatively charged particles, centrality 1.0-1.5
Venus + reconstructionVenus
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<pT> vs. N , negatively charged particles. MC data Pb+Pb at 158A GeV. Collision parameter 5 fm < b <5.5 fm. 0.005 < pT < 1.5 4.0 < y < 5.5
VENUS + acceptaneb = 3.21 1.0
VENUS + reconstruction + acceptanceb = 3.81 1.1
NNbap
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<pT> vs. N , negatively charged particles. MC data Pb+Pb at 158A GeV. Collision parameter 9 fm < b <9.5 fm. 0.005 < pT < 1.5 4.0 < y < 5.5
VENUS + acceptaneb = 0.06 0.91
VENUS + reconstruction + acceptanceb = 0.03 0.9
NNbap
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<pT> vs. N , negatively charged particles. MC data Pb+Pb at 158A GeV. Collision parameter 12 fm < b <12.5 fm. 0.005 < pT < 1.5 4.0 < y < 5.5
VENUS + acceptaneb = -2.32 0.8
VENUS + reconstruction + acceptanceb = -5.06 1.0
NNbap
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Data std +
Collision parameter
Negatively charged
Positively charged
All charged
b b b b b b
VENUS + ACC 1.0 – 1.5 5.53 1.19 5.73 1.19 6.08 1.09
VENUS + REC + ACC 7.12 1.24 8.35 1.45 11.82 1.25
VENUS + ACC 5.0 – 5.5 3.21 1.0 2.50 1.08 2.57 0.92
VENUS + REC + ACC 3.81 1.1 3.21 1.3 3.71 1.04
VENUS + ACC 9.0 – 9.5 -0.06 0.91 0.9 0.96 -1.89 0.78
VENUS + REC + ACC 0.03 0.9 -1.39 1.16 -2.35 0.9
VENUS + ACC 12.0 – 12.5 -2.32 0.80 0.26 0.86 -2.09 0.67
VENUS + REC + ACC -2.47 0.83 -5.06 1.00 -5.06 0.74
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VENUS dataPb + Pb 80A GeV
2 centrality bins – 25 k events in each bin
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<pT> vs. N , negatively charged particles. MC data Pb+Pb at 80A GeV. Collision parameter 1 < b <1.5 0.005 < pT < 1.5 4.0 < y < 5.5
VENUS + acceptaneb = 3.54 1.14
VENUS + reconstruction + acceptanceb = 1.59 0.81
NNbap
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Negatively charged particles, centrality 1.0-1.5
Venus + reconstructionVenus
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VENUS – top panelsVENUS + acceptance – bottom panels
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VENUS + reconstruction – top panelsVENUS + reconstruction + acceptance – bottom panels
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<pT> vs. N , negatively charged particles. MC data Pb+Pb at 80A GeV. Collision parameter 5 fm < b < 5.5 fm 0.005 < pT < 1.5 4.0 < y < 5.5
VENUS + acceptaneb = 2.77 1.10
VENUS + reconstruction + acceptanceb = 1.03 0.79
NNbap
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Data std +
Collision parameter
Negatively charged
Positively charged
All charged
b b b b b b
VENUS + ACC 1.0 – 1.5 3.54 1.14 1.96 1.16 2.36 1.11
VENUS + REC + ACC 1.59 0.81 3.35 1.11 3.23 1.00
VENUS + ACC 5.0 – 5.5 2.77 1.1 4.12 1.13 4.07 1.07
VENUS + REC + ACC 1.03 0.79 2.61 1.05 1.37 0.94
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Correction of influence of detector acceptance on final results • For one collision energy we need 20 centrality bins. • 25 000 events in each bin.• Estimated time – 10 – 20 weeks for simulations of one collision energy (simulated data are stored on the tapes and reading them is time consuming process).• For preparation full statistic for all 5 collision energies we need 2 years.
Differences of value b for collision energy 158 and 80A GeV are smaller then statistical uncertainty of experimental data.
Good solution is to check the influence of detector acceptance for 3 different centrality bins for each collision energy. If the influence is too small we should publish data without any correction.
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Additional slides
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Additional slides
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Additional slides
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Additional slides
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Additional slides