# calculation of correction factor to kt with STAR simulated datasets for dijets.

Di-jet cross section from the page :

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

Pt RangeNumber 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

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