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Rapidity dependency of azimuthal correlations for pp and dAu Xuan Li (BNL&SDU) STAR Collaboration meeting (BNL, Nov 2010) 1Xuan Li.

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Presentation on theme: "Rapidity dependency of azimuthal correlations for pp and dAu Xuan Li (BNL&SDU) STAR Collaboration meeting (BNL, Nov 2010) 1Xuan Li."— Presentation transcript:

1 Rapidity dependency of azimuthal correlations for pp and dAu Xuan Li (BNL&SDU) STAR Collaboration meeting (BNL, Nov 2010) 1Xuan Li

2 Outline Motivation Data analysis – cluster finder introduction – π 0 like events selection and data & simulation comparison – Preliminary correlation results Summary & To do Xuan Li2

3 Motivation To probe nuclear gluon density at low x. Xuan Li3 Proton gluon density At a given x, nuclear (mass number A) gluon density ≈ A 1/3 * nucleon gluon density. And we lack data below x=0.02 for nuclear [Phys. Rev. C70 (2004)044905, hep-ph/0308248]. Can’t increase indefinitely. Saturation? Fixed Target Experiments Rapid rise of the gluon density at low-x evident from  F 2 (x)/  lnQ 2 at fixed x (Prytz relation)

4 Motivation How to access low X gluon. Xuan Li4 Large rapidity  production   ~4  probes asymmetric partonic collisions. Mostly high-x valence quark + low-x gluon 0.3 < x q < 0.7 0.001< x g < 0.1, this is broad distribution for gluon. If we measure two jets, we will limit the measured gluon x range. Forward di-jets are more sensitive to low x gluon.

5 Motivation Test the phase boundary at fixed Q 2. Xuan Li5 Fix P T, look through different x region  related to rapidity of produced hadrons. (Iancu and Venugopalan, hep-ph/0303204) Fix P t at forward rapidity π 0, and vary the rapidity of associated π 0. Vary the P t to study the boundary.

6 Motivation Xuan Li6 FMS-BEMC(TPC) correlation Triggering on the forward rapidity π 0, the rapidity of the associated π 0 is correlated with the soft parton involved in the partonic scattering. Provide direct sensitivity to gluon density at 0.001< x < 0.02. arXiv:0907.3473 P T (FMS)>2.5GeV/c 1.5GeV/c<P T (BEMC/TPC)<P T (FMS) P T (FMS)>2.0GeV/c 1.0GeV/c<P T (BEMC/TPC)<P T (FMS)

7 Motivation Xuan Li7 FMS-FMS correlation Triggering on the forward rapidity π 0, the rapidity of the associated π 0 is correlated with the soft parton involved in the partonic scattering. Provide direct sensitivity to gluon density at 0.001< x < 0.02. arXiv:1005.2378

8 Motivation Xuan Li8 FMS-EEMC correlation Triggering on the forward rapidity π 0, the rapidity of the associated π 0 is correlated with the soft parton involved in the partonic scattering. Provide direct sensitivity to gluon density at 0.001< x < 0.02.

9 π 0 decay kinematics Run8 STAR geometry Xuan Li9 π 0 decay into 2 photons. Assuming the energy of π 0 is 3GeV to 10GeV, then the separation of photons in EEMC is from 25.2cm to 7.6 cm. Proton (Deuteron)Proton (Gold)

10 FMS π 0 triggered event Within the FMS triggered data, selecting events where di- photon invariant mass is less than 0.2GeV/c 2 and P t is larger than 2.5 GeV/c. Xuan Li10 For example, with pp FMS triggered data. Primary vertex associated with BBC coincidence requirements.

11 Introduction to cluster finder BEMC (EEMC) geometry EEMC η range [1.08,2.0], BEMC η range [-1,1]. Xuan Li11 Z X(Y) X Y ϕ η ϕ η EEMCBEMC

12 Event display Run 8 pp fms triggered data. Cluster is threshold bounded group of towers. The energy threshold for the BEMC tower is 70MeV, and for EEMC is ADC pedestal plus 4sigma. Sorting the tower energy, then add in the tower near the high tower to construct cluster. Xuan Li12 EEMCBEMC cluster BEMC tower energy deposited without energy threshold.

13 EEMC cluster properties in pp data Single cluster tower multiplicity, energy, η and φ. 13 ppdAu 1: Tower multiplicity mean 1.841.93 2: cluster energy mean 0.930.94 3: cluster η mean1.491.57 4 cluster ϕ χ 2 /ndf 76406 12 3 4

14 BEMC cluster properties in pp data Single cluster tower multiplicity, energy, η and φ. 14 ppdAu 1: Tower multiplicity mean 1.521.83 2: cluster energy mean 0.430.70 3: cluster η mean0.02 4: cluster ϕ χ 2 /ndf 241186

15 π 0 like event (di-cluster) PP part for BEMC η>=0 part. 15 Mass of di-clusters leading tower energy over cluster energy in leading cluster Zγγ is energy sharing between two clusters (1) 1.25GeV/c < P t <2.5GeV/c (2) Fiducial Volume cut, require cluster detector η in [0,0.9].. (1) 1.25GeV/c < P t <2.5GeV/c (2) Fiducial Volume cut, reuire cluster detector η in [0,0.9]. (3) Ratio of leading tower energy over cluster energy > 0.9 (4) Zγγ < 0.7 π 0 peak in BEMC di-clusters.

16 π 0 like event (di-cluster) PP part for EEMC 16 Mass of di-clusters Zγγ is energy sharing between two clusters leading tower energy over cluster energy in leading cluster (1) 1.25GeV/c < P t <2.5GeV/c (2) Fiducial Volume cut, require cluster detector η in [1.1,1.9].. (1) 1.25GeV/c < P t <2.5GeV/c (2) Fiducial Volume cut, reuire cluster detector η in [1.1,1.9]. (3) Ratio of leading tower energy over cluster energy > 0.9 (4) Zγγ < 0.7 π 0 peak in EEMC di-clusters.

17 π 0 like event (di-cluster) dAu part for BEMC η>=0 part. 17 Mass of di-clusters leading tower energy over cluster energy in leading cluster Zγγ is energy sharing between two clusters (1) 1.25GeV/c < P t <2.5GeV/c (2) Fiducial Volume cut, require cluster detector η in [0,0.9].. (1) 1.25GeV/c < P t <2.5GeV/c (2) Fiducial Volume cut, reuire cluster detector η in [0,0.9]. (3) Ratio of leading tower energy over cluster energy > 0.9 (4) Zγγ < 0.7 π 0 peak in BEMC di-clusters.

18 π 0 like event (di-cluster) dAu part for EEMC 18 Mass of di-clusters leading tower energy over cluster energy in leading cluster Zγγ is energy sharing between two clusters (1) 1.25GeV/c < P t <2.5GeV/c (2) Fiducial Volume cut, require cluster detector η in [1.1,1.9].. (1) 1.25GeV/c < P t <2.5GeV/c (2) Fiducial Volume cut, reuire cluster detector η in [1.1,1.9]. (3) Ratio of leading tower energy over cluster energy > 0.9 (4) Zγγ < 0.7 π 0 peak in EEMC di-clusters.

19 π 0 events in the EEMC single cluster? Assuming the tower is zero massed, Assuming the leading tower, sub-leading tower as the photon candidates in the EEMC single cluster, Dγγ is defined as the separation between the photons which is projected in the EEMC detector. Xuan Li19 X Y Dγγ Z X(Y) γ1γ1 γ2γ2 Dγγ

20 Simulated π 0 decay kinematics Projection on the EEMC, with the π 0 P t in [1.25GeV/c, 2.5GeV/c] and Zγγ<0.7 cuts. Xuan Li20 Dγγ VS η of π 0 Dγγ VS Zγγ Most of the π 0 events are in EEMC single clusters. For FMS π 0 events, Cuts on the single cluster is (1)1.25GeV/c<P t <2.5GeV/c (2)Zγγ < 0.7

21 π 0 like event (single cluster) PP part for EEMC 21 Mass of single cluster Leading and sub-leading tower energy over cluster energy Zγγ is energy sharing between leading two towers. 1.25GeV/c < P t <2.5GeV/c (1) 1.25GeV/c < P t <2.5GeV/c. (2) Ratio of leading plus sub-leading tower energy over cluster energy in [0.5,0.85]. (3) Zγγ < 0.65 π 0 candidates

22 π 0 like event (single cluster) dAu part for EEMC 22 Mass of single cluster Leading and sub-leading tower energy over cluster energy Zγγ is energy sharing between leading two towers. 1.25GeV/c < P t <2.5GeV/c (1) 1.25GeV/c < P t <2.5GeV/c. (2) Ratio of leading plus sub-leading tower energy over cluster energy in [0.5,0.85]. (3) Zγγ < 0.65 π 0 candidates

23 MB data and simulation comparison EEMC pp MB single cluster simulation. Xuan Li23 ratio is Leading and sub -leading tower energy over cluster energy. Zγγ is energy sharing between leading two towers. Simulation Data

24 MB data and simulation comparison EEMC pp MB single cluster propeties. Xuan Li24 MB simulation MB data

25 MB data and simulation comparison EEMC pp MB single cluster invariant mass. Xuan Li25 (1) 1.25GeV/c < P t <2.5GeV/c. (2) Ratio of leading plus sub-leading tower energy over cluster energy in [0.5,0.85]. (3) Zγγ < 0.65 scale different SimulationData

26 MB data and simulation comparison EEMC dAu MB single cluster invariant mass. Xuan Li26 (1) 1.25GeV/c < P t <2.5GeV/c. (2) Ratio of leading plus sub-leading tower energy over cluster energy in [0.5,0.85]. (3) Zγγ < 0.65 scale different SimulationData

27 Azimuthal correlation (FMS-BEMC) FMS photon pair P t > 2.5GeV/c and mass<0.2 GeV/c 2. BEMC di-cluster 1.25GeV/c < P t < 2.5GeV/c and mass<0.2GeV/c 2. Xuan Li27 Fms triggered pp dataFms triggered dAu data Width 0.710 ± 0.030Width 0.733± 0.041

28 Azimuthal correlation (FMS-BEMC) FMS photon pair P t > 2.0GeV/c and mass<0.2 GeV/c 2. BEMC di-cluster 1.0GeV/c < P t < 2.0GeV/c and mass<0.2GeV/c 2. Xuan Li28 Fms triggered pp dataFms triggered dAu data Width 0.815 ± 0.019Width 0.752± 0.031

29 Azimuthal correlation (FMS-EEMC) FMS photon pair P t > 2.5GeV/c and mass<0.2 GeV/c 2. EEMC di-cluster 1.25GeV/c < P t < 2.5GeV/c and mass<0.2GeV/c 2. Xuan Li29 Fms triggered pp data Fms triggered dAu data Width 0.961 ± 0.127Width 0.817 ± 0.196

30 Azimuthal correlation (FMS-EEMC) FMS photon pair P t > 2.0GeV/c and mass<0.2 GeV/c 2. EEMC di-cluster 1.0GeV/c < P t < 2.0GeV/c and mass<0.2GeV/c 2. Xuan Li30 Fms triggered pp dataFms triggered dAu data Width 0.833 ± 0.048Width 1.032 ± 0.179

31 Azimuthal correlation (FMS-EEMC) FMS photon pair P t > 2.5GeV/c and mass<0.2 GeV/c 2. EEMC single cluster 1.25GeV/c < P t < 2.5GeV/c and mass<0.2GeV/c 2. Xuan Li31 Fms triggered pp dataFms triggered dAu data Width 0.731 ± 0.021Width 0.935 ± 0.061

32 Azimuthal correlation (FMS-EEMC) FMS photon pair P t > 2.0GeV/c and mass<0.2 GeV/c 2. EEMC single cluster 1.0GeV/c < P t < 2.0GeV/c and mass<0.2GeV/c 2. Xuan Li32 Fms triggered pp dataFms triggered dAu data Width 0.840 ± 0.015Width 1.039 ± 0.053

33 Summary To find the 3 rd point from FMS-EEMC azimuthal correlation to approach gluon density at low x. BEMC di-cluster π 0 like correlation results are consistent with Ermes’s correlation results. There are π 0 like hints in the EEMC tower clusters. Xuan Li33 To do To add in ESMD information to get clearer π 0 events. Need suggestions and help for he ESMD calibration. Work on the

34 Backup Xuan Li34

35 Motivation Xuan Li35 FMS-FMS correlation FMS-EEMC correlation FMS-BEMC(TPC) correlation Triggering on the forward rapidity π 0, the rapidity of the associated π 0 is correlated with the soft parton involved in the partonic scattering. Provide direct sensitivity to gluon density at 0.001< x < 0.02.

36 Event display Run 8 dAu fms triggered data. Xuan Li36 EEMCBEMC

37 Cluster width definition BEMC Unfold the barrel, and put in the R ϕ, Z plane. Xuan Li37 Z X(Y) R ϕ Z RϕRϕ Large width Small width

38 Cluster width definition EEMC In xy plane. Xuan Li38 X Y Large width Small width X Y

39 dAu FMS triggered data FMS di-photon invariant mass. Xuan Li39 With FMS photon pair which has mass less than 0.2GeV/c 2 and P t larger than 2.5 GeV/c.

40 EEMC cluster property in dAu data Single cluster tower multiplicity, energy, η and φ. Xuan Li40

41 BEMC cluster property in dAu data Single cluster tower multiplicity, energy, η and φ. Xuan Li41

42 π 0 like event (single cluster) EEMC pp fms triggered single cluster mass. Xuan Li42

43 π 0 like event (single cluster) EEMC dAu fms triggered single cluster mass. Xuan Li43

44 MB data and simulation comparison EEMC dAu MB single cluster simulation. Xuan Li44 ratio is Leading and sub -leading tower energy over cluster energy. Zγγ is energy sharing between leading two towers. Simulation Data

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