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Transverse momentum vs. multiplicity correlations. Agnieszka Wojtaszek-Szwarc Jan Kochanowski University. NA61/SHINE and NA49 meeting in Warsaw 10-14.02.2014. Analysis of p T - <N> correlation. Pb+Pb collision at 158, 80, 40, 30 and 20A GeV

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Transverse momentum vs multiplicity correlations

Transverse momentum vs. multiplicity correlations

AgnieszkaWojtaszek-Szwarc

Jan Kochanowski University

NA61/SHINE and NA49 meeting in Warsaw 10-14.02.2014


Analysis of p t n correlation
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 havebeen done in narrow centrality bins

A.Wojtaszek-Szwarc 14-02-2014


Transverse momentum vs multiplicity correlations

Example of pT- N correlations

Pb+Pb at 160A GeV

Centrality 3.5% – 4.0%

A.Wojtaszek-Szwarc 14-02-2014





Transverse momentum vs multiplicity correlations

VENUS data

Pb + Pb 158A GeV

4 centrality bins – 25 k events in each bin

A.Wojtaszek-Szwarc 14-02-2014


Transverse momentum vs multiplicity correlations

<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 + acceptane

b = 3.21  1.0

VENUS + reconstruction + acceptance

b = 3.81  1.1

A.Wojtaszek-Szwarc 14-02-2014


Venus top panels venus acceptance bottom panels
VENUS – top panelsVENUS + acceptance – bottompanels

A.Wojtaszek-Szwarc 14-02-2014


Transverse momentum vs multiplicity correlations

VENUS + reconstruction – top panelsVENUS + reconstruction + acceptance – bottompanels

A.Wojtaszek-Szwarc 14-02-2014


Transverse momentum vs multiplicity correlations

Negatively charged particles, centrality 1.0-1.5

Venus

Venus + reconstruction

A.Wojtaszek-Szwarc 14-02-2014


Transverse momentum vs multiplicity correlations

<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 + acceptane

b = 3.21  1.0

VENUS + reconstruction + acceptance

b = 3.81  1.1

A.Wojtaszek-Szwarc 14-02-2014


Transverse momentum vs multiplicity correlations

<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 + acceptane

b = 0.06  0.91

VENUS + reconstruction + acceptance

b = 0.03  0.9

A.Wojtaszek-Szwarc 14-02-2014


Transverse momentum vs multiplicity correlations

<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 + acceptane

b = -2.32  0.8

VENUS + reconstruction + acceptance

b = -5.06  1.0

A.Wojtaszek-Szwarc 14-02-2014



Transverse momentum vs multiplicity correlations

VENUS data

Pb + Pb 80A GeV

2 centrality bins – 25 k events in each bin

A.Wojtaszek-Szwarc 14-02-2014


Transverse momentum vs multiplicity correlations

<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 + acceptane

b = 3.54  1.14

VENUS + reconstruction + acceptance

b = 1.59  0.81

A.Wojtaszek-Szwarc 14-02-2014


Transverse momentum vs multiplicity correlations

Negatively charged particles, centrality 1.0-1.5

Venus

Venus + reconstruction

A.Wojtaszek-Szwarc 14-02-2014


Transverse momentum vs multiplicity correlations

VENUS – top panelsVENUS + acceptance – bottompanels

A.Wojtaszek-Szwarc 14-02-2014


Transverse momentum vs multiplicity correlations

VENUS + reconstruction – top panelsVENUS + reconstruction + acceptance – bottompanels

A.Wojtaszek-Szwarc 14-02-2014


Transverse momentum vs multiplicity correlations

<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 + acceptane

b = 2.77  1.10

VENUS + reconstruction + acceptance

b = 1.03  0.79

A.Wojtaszek-Szwarc 14-02-2014



Transverse momentum vs multiplicity correlations

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.

A.Wojtaszek-Szwarc 14-02-2014


Transverse momentum vs multiplicity correlations

Additional slides results

A.Wojtaszek-Szwarc 14-02-2014


Transverse momentum vs multiplicity correlations

Additional slides results

A.Wojtaszek-Szwarc 14-02-2014


Additional slides
Additional slides results

A.Wojtaszek-Szwarc 14-02-2014


Transverse momentum vs multiplicity correlations

Additional slides results

A.Wojtaszek-Szwarc 14-02-2014


Transverse momentum vs multiplicity correlations

Additional slides results

A.Wojtaszek-Szwarc 14-02-2014