Di-jet cross section from the page :

 

www.star.bnl.gov/protected/spin/staszak/2006/Sims/Simulation.html

  Pt Range  
  Number of Events  
  Partial Xsec (mb)  

3-4	690k	1.297
4-5	686k	3.151 E-01
5-7	398k	1.364 E-01
7-9	420k	2.299 E-02
9-11	412k	5.504 E-03
11-15	420k	2.220 E-03
15-25	397k	3.895 E-04
25-35	400k	1.021 E-05
35-45	120k	5.016 E-07
45-55	118k	2.864 E-08
55-65	120k	1.447 E-09

Simulation dataset page :

drupal.star.bnl.gov/STAR/comp/simu/datasets/2007

 

We have used the 5-7, 7-9, 9-11, 11-15,15-25 Pt range expecting the neutral pi0 (for HT data -run 6 for pp) will come pedominantly

from the region.

 

The data and simulation plots scales by entries  are shown below.

 

 

 

 

Two cases :  (1) sarting from 5-7 bins to 15-25 bins : (CASE-I)

                       (2) sarting from 5-7 bins to 15-25 bins : (CASE-II)

Double_t sum, frac1, frac2, frac3, frac4, frac5, x1, x2, x3, x4, x5;
x1 = 0.1364;
x2 = 0.02299;
x3 = 0.005504;
x4 = 0.002220;
x5 = 0.0003895;

CASE -I
sum = (x2+x3+x4+x5);
frac2 = x2/sum;
frac3 = x3/sum;
frac4 = x4/sum;
frac5 = x5/sum;
hPREADC[10]->Add(hPREADC[1],frac2);
hPREADC[10]->Add(hPREADC[2],frac3);
hPREADC[10]->Add(hPREADC[3],frac4);
hPREADC[10]->Add(hPREADC[4],frac5);

CASE-I
sum = (x1+x2+x3+x4+x5);
frac1 = x1/sum;
frac2 = x2/sum;
frac3 = x3/sum;
frac4 = x4/sum;
frac5 = x5/sum;
hPREADC[11]->Add(hPREADC[0],frac1);
hPREADC[11]->Add(hPREADC[1],frac2);
hPREADC[11]->Add(hPREADC[2],frac3);
hPREADC[11]->Add(hPREADC[3],frac4);
hPREADC[11]->Add(hPREADC[4],frac5);

 

Multiplying hPREADC[10] and hPREADC[11] with 1.0, 2.0, ..... 10.0 in order to match the data, CASE-II seems to be reasonable.

 

 

 

 

NOW the steps here used to extract the correction factor is that  the correction factor for 7-9, 9-11, 11-15, 15-25 pT bins extracted.

and finnally it is avearged out for all the pT bins with relative weightage.

 

WITH PTt (trigger particle)

 

 

After proper weightage : 

 

 

WITH pTa(associated particles) [pTt = 6.5 - 8.5]

 

This is done for 1/5 th if the simulated dataset in grid. Runing for full dataset.

 

 

We have used ch-ch correation function using charge tracks for trigger particle and the pT range is relatively

lower compared to that from neutral pion from BEMC.

Simulated data for MB and CKIN 3-4, 4-5, 5-7, 7-9 in comparison with real data is shown here.              

 

 

 

Using CKIN with relative  weightage

3-4                                  x2 = 1.297;
4-5                                  x3 = 0.3151;
5-7                                  x4 = 0.1364;
7-9                                  x5 = 0.02299;

we have the comparison of data and the simulated data.

Here we are interested for pT > 4.GeV