News from ToF+dEdx analysis in Be+Be interactions. Magdalena Kuich - - PowerPoint PPT Presentation

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News from ToF+dEdx analysis in Be+Be interactions. Magdalena Kuich - - PowerPoint PPT Presentation

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News from ToF+dEdx analysis in Be+Be interactions. Magdalena Kuich University of Warsaw May 19, 2016 1 / 45 Outline Data 1 Cuts 2 Procedure 3 Fits 4 Parameters 5 Spectra 6 Comparison with Emil 7 Comparison with EPOS 8

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SLIDE 1

News from ToF+dEdx analysis in Be+Be interactions.

Magdalena Kuich

University of Warsaw

May 19, 2016

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SLIDE 2

Outline

1

Data

2

Cuts

3

Procedure

4

Fits

5

Parameters

6

Spectra

7

Comparison with Emil

8

Comparison with EPOS

9

Transverse momentum spectra

10 Step 11 Horn

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SLIDE 3

Data and statistic

Analysed data come from last mass production: 056_14e_v1r3p0_pA_slc6_phys. Events: BeBe 40 BeBe 75 BeBe 150 Before cuts 3336913 3805609 3030496 After cuts 392722 426555 334118 Tracks: BeBe 40 BeBe 75 BeBe 150 Before cuts 5523945 8323675 8988740 After cuts 169985 399201 641214

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SLIDE 4

Event cuts

Event cuts - data Target IN/OUT, BPD status, BPD extrapolation, Beam Position, S1 vs. Z, BPD charge vs. Z, Z off-time, WFA particles (4.5µs), WFA interaction, T2 trigger, Vertex track fitted to the main vertex, Vertex fit quality = ePerfect, Fitted vertex position

  • 580 ± 18cm.

Event cuts - MC Vertex track fitted to the main vertex, Vertex fit quality = ePerfect, Fitted vertex position

  • 580 ± 18cm.

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SLIDE 5

Track cuts

Track cuts - data Track status, Charge ±1, Rst, Total number of clusters, VTPCs+GapTPC clusters, Number of dEdx cluster, Last point in TPCs, ToF acceptance, ToF Iflag, Good QDC, Track hit only 1 scintillator, Fitted phase space. Track cuts - MC Track status, Charge ±1, Rst, Total number of clusters, VTPCs+GapTPC clusters, Number of dEdx cluster, Last point in TPCs, ToF acceptance, Decay probability, ToF dead and efficiency pixels, Track hits 1 pixel Fit acceptance → transition from p-pT to y-pT phase space.

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SLIDE 6

Fitting procedure

phase space was divided to subspaces (bins) of size of 1 GeV/c in ptot and 0.1 GeV/c in pT in chosen bin a 2D gaussian function was fitted:

G =

  • i=p,π,K,e

Ai(fe

−( (dEdx−dedxi )2 2σ2 dedx + (m2−m2 i )2 2σ2 m2 1 )

+ (1 − f )e

−( (dEdx−dedxi )2 2σ2 dedx + (m2−m2 i )2 2σ2 m2 2 )

) (1)

  • 4 (3) amplitudes
  • 4 (3) dEdx positions
  • 4 (3) m2 positions
  • 3 σ
  • 1 factor f

Be+Be 150 GeV/c 6 < p < 7 GeV/c and 0.0 < pT < 0.1 GeV/c

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SLIDE 7

Fitting procedure

dEdx starting values taken from SHINE module, momentum dependency taken into account, m2 starting values taken from PDG database:

◮ proton m2 = 0.880354 (GeV /c2)2 ◮ pion m2 = 0.0194798 (GeV /c2)2 ◮ kaon m2 = 0.243717 (GeV /c2)2 ◮ electron m2 = 2.6112·10−7 (GeV /c2)2

starting value of factor f ∼ 0.9 starting value of amplitudes were estimated as a proportional contribution to analyzed histogram starting values of other parameters (σdEdx, σm1, σm2) were tuned after first tests. identification was calculated: Pj = Gj G (2) Bins with more than 300 entries (tracks) were chosen to analyze.

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SLIDE 8

Fit examples -BeBe 40

Positively charged particles 3 < p < 4 and 0.2 < pT < 0.3 Negatively charged particles 2 < p < 3 and 0.3 < pT < 0.4

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SLIDE 9

Fit examples -BeBe 75

Positively charged particles 5 < p < 6 and 0.2 < pT < 0.3 Negatively charged particles 4 < p < 5 and 0.2 < pT < 0.3

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SLIDE 10

Fit examples -BeBe 150

Positively charged particles 5 < p < 6 and 0.1 < pT < 0.2 Negatively charged particles 6 < p < 7 and 0.3 < pT < 0.4

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SLIDE 11

Fitted dEdx positions: BeBe 40, BeBe 75, BeBe 150

Positively charged particles Negatively charged particles

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SLIDE 12

Fitted mass positions: BeBe 40, BeBe 75, BeBe 150

Positively charged particles Negatively charged particles

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SLIDE 13

Raw normalized spectra - positively charged particles BeBe 40 centrality 0-20%

p K+ π+

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SLIDE 14

MC corrections of spectra - protons BeBe 40 centrality 0-20%

MCGEN Ratio MCREC/MCGEN MCREC Corrected p spectra

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MC corrections of spectra - positively charged pions BeBe 40 centrality 0-20%

MCGEN Ratio MCREC/MCGEN MCREC Corrected π+ spectra

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SLIDE 16

MC corrections of spectra - positively charged kaons BeBe 40 centrality 0-20%

MCGEN Ratio MCREC/MCGEN MCREC Corrected K+ spectra

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SLIDE 17

Raw normalized spectra - negatively charged particles BeBe 40 centrality 0-20%

¯ p K− π−

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SLIDE 18

MC corrections of spectra - antiprotons BeBe 40 centrality 0-20%

MCGEN Ratio MCREC/MCGEN MCREC Corrected ¯ p spectra

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SLIDE 19

MC corrections of spectra - negatively charged pions BeBe 40 centrality 0-20%

MCGEN Ratio MCREC/MCGEN MCREC Corrected π− spectra

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MC corrections of spectra - negatively charged kaons BeBe 40 centrality 0-20%

MCGEN Ratio MCREC/MCGEN MCREC Corrected K− spectra

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SLIDE 21

Raw normalized spectra - positively charged particles BeBe 75 centrality 0-20%

p K+ π+

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SLIDE 22

MC corrections of spectra - protons BeBe 75 centrality 0-20%

MCGEN Ratio MCREC/MCGEN MCREC Corrected p spectra

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MC corrections of spectra - positively charged pions BeBe 75 centrality 0-20%

MCGEN Ratio MCREC/MCGEN MCREC Corrected π+ spectra

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MC corrections of spectra - positively charged kaons BeBe 75 centrality 0-20%

MCGEN Ratio MCREC/MCGEN MCREC Corrected K+ spectra

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Raw normalized spectra - negatively charged particles BeBe 75 centrality 0-20%

¯ p K− π−

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SLIDE 26

MC corrections of spectra - antiprotons BeBe 75 centrality 0-20%

MCGEN Ratio MCREC/MCGEN MCREC Corrected ¯ p spectra

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MC corrections of spectra - negatively charged pions BeBe 75 centrality 0-20%

MCGEN Ratio MCREC/MCGEN MCREC Corrected π− spectra

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MC corrections of spectra - negatively charged kaons BeBe 75 centrality 0-20%

MCGEN Ratio MCREC/MCGEN MCREC Corrected K− spectra

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SLIDE 29

Raw normalized spectra - positively charged particles BeBe 150 centrality 0-20%

p K+ π+

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SLIDE 30

MC corrections of spectra - protons BeBe 150 centrality 0-20%

MCGEN Ratio MCREC/MCGEN MCREC Corrected p spectra

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SLIDE 31

MC corrections of spectra - positively charged pions BeBe 150 centrality 0-20%

MCGEN Ratio MCREC/MCGEN MCREC Corrected π+ spectra

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SLIDE 32

MC corrections of spectra - positively charged kaons BeBe 150 centrality 0-20%

MCGEN Ratio MCREC/MCGEN MCREC Corrected K+ spectra

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SLIDE 33

Raw normalized spectra - negatively charged particles BeBe 150 centrality 0-20%

¯ p K− π−

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SLIDE 34

MC corrections of spectra - antiprotons BeBe 150 centrality 0-20%

MCGEN Ratio MCREC/MCGEN MCREC Corrected ¯ p spectra

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SLIDE 35

MC corrections of spectra - negatively charged pions BeBe 150 centrality 0-20%

MCGEN Ratio MCREC/MCGEN MCREC Corrected π− spectra

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MC corrections of spectra - negatively charged kaons BeBe 150 centrality 0-20%

MCGEN Ratio MCREC/MCGEN MCREC Corrected K− spectra

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Comparison with Emil’s π−, centrality 0-20% BeBe 40

Emil’s spectra of π− tof /h− tof π− spectra

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SLIDE 38

Comparison with Emil’s π−, centrality 0-20% BeBe 75

Emil’s spectra of π− tof /h− tof π− spectra

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SLIDE 39

Comparison with Emil’s π−, centrality 0-20% BeBe 150

Emil’s spectra of π− tof /h− tof π− spectra

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SLIDE 40

π± spectra vs EPOS in ’banana acceptance’

Positively charged particles Negatively charged particles

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SLIDE 41

K± spectra vs EPOS in 0.0 < y < 0.2

Positively charged particles Negatively charged particles

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SLIDE 42

p± spectra vs EPOS in −0.2 < y < 0.0

Positively charged particles Negatively charged particles

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SLIDE 43

K± pT spectra in 0.0 < y < 0.2

Positively charged particles Negatively charged particles

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Step - inverse slop parameter in 0.0 < y < 0.2

[GeV]

NN

s 1

2

10

4

10 T [MeV] 200 400

p+p Be+Be Pb+PbAu+Au

SPS(NA61 Be+Be) SPS(NA61 p+p) WORLD(p+p) AGS SPS(NA49) RHIC LHC(ALICE)

+

K

≈ y

[GeV]

NN

s 1

2

10

4

10 T [MeV] 200 400

SPS(NA61 Be+Be) SPS(NA61 p+p) WORLD(p+p) AGS SPS(NA49) RHIC LHC(ALICE)

  • K

≈ y

Pb+PbAu+AuBe+Bep+p

d2n dpTdy = S pT T2 + T mK exp(−

  • p2

T + m2 K − mK

T )

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SLIDE 45

Horn - K

π ratio in 0.0 < y < 0.2

[GeV]

NN

s 1

2

10

4

10 0) ≈ (y

+

π /

+

K 0.1 0.2

SPS(NA61 Be+Be) SPS(NA61 p+p) ) π WORLD(p+p, 4 AGS SPS(NA49) RHIC LHC(ALICE)

Pb+PbAu+AuBe+Bep+p

[GeV]

NN

s 1

2

10

4

10 0) ≈ (y

  • π

/

  • K

0.1 0.2

SPS(NA61 Be+Be) SPS(NA61 p+p) ) π WORLD(p+p, 4 AGS SPS(NA49) RHIC LHC(ALICE)

Pb+PbAu+Au Be+Bep+p

Kaon multiplicity is obtained with tof − dEdx spectra in available accepcatne and exptrapoleted to pT = 1.2. Pion multiplicity taken to these plots comes from h− analysis from Emil.

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