Jet Energy in different cone radius for quark and gluon initiated jets

MSEL = 1, hadron-hadron ;

QCD high p_T processes : ISUB =11, 12, 13, 28, 53, 68 ;

CKIN(3) > 12.5-100 GeV (value of allowd p_T in 2->2 hard scattering processes in CM frame of the partonic system) ;

 

CUTS USED :

Events with pi^0 as leading particle with p_T > 4 GeV within \eta < 0.7

Charge particles \pi^{pm}, K^{pm}, photons, are being considered within Abs(\eta) < 1.0

ET/(ET+PT) < 0.6 , where PT with charge tracks with p_T> 0.2 within |\eta| < 1.0

 

Few Things are sudied.

 

A.   The fraction of the jet energy going within  a defined cone radius R for a quark and a gluon initiated  jet.

This is calculated separately the jets belonging to the trigger side and the away side.

 

 

Jet recontuction using cone radius (R = 0.7) is made. Two leading particles with p_T  > 1.2 GeV

and separared by at least 1.5 radian are being considered.

Jets with E_T (Min) > 10GeV  and E_T (Max) > 12GeV are being considered as event cut, in the

range where the jet energy recontructin performance reaches constant value.

 

B)  The fraction of the jet energy after event selection  (gluon jet reduced/ jets with wider fragnentation is reduced):

 

C) The \hat{x}_h <Z_t> \sqrt{k_T^2} before and after the cut separately for qg+gg

and  qq processes are shown here.


 

qg + gg shows distinct difference.

qq shows no differencewithin error. The  statistics here is too small.  

 

Does the low x-gluon resposible for  lie outside the detector acceptance.

Let us find   how the two final state lie in \eta1-eta2 spce

 

ALL the Events : 

EVENTS After the cut

 

 

Events at difference eta acceptance  for pT(trig) > 4 GeV:

N_qq, N_qg, N_gq, N_gg   within |eta| as a fuction of |eta|

 

N_qq (with acceptance |eta|)/ (N_qq + N_qg + N_gq + N_gg) 

N_qg (with acceptance |eta|)/ (N_qq + N_qg + N_gq + N_gg)

N_gq (with acceptance |eta|)/ (N_qq + N_qg + N_gq + N_gg)

N_gg (with acceptance |eta|)/ (N_qq + N_qg + N_gq + N_gg)   fractions with acceptance |eta| as a function of |eta|

 

 

 

 

N_qq (within acceptance |eta|)/ (N_qq)

N_qg (within acceptance |eta|)/ (N_qg)

N_gq (within acceptance |eta|)/ (N_gq)

N_gg (within acceptance |eta|)/ (N_gg)  fraction as a function of acceptance |eta|.

 

 ...................................................................................................................................................................................................................

Events at difference eta acceptance  for pT(trig) > 7 GeV:

 

N_qq, N_qg, N_gq, N_gg   within |eta| as a fuction of |eta|

 

N_qq (within acceptance |eta|)/ (N_qq)

N_qg (within acceptance |eta|)/ (N_qg)

N_gq (within acceptance |eta|)/ (N_gq)

N_gg (within acceptance |eta|)/ (N_gg)  fraction as a function of acceptance |eta|.

 

N_qq (with acceptance |eta|)/ (N_qq + N_qg + N_gq + N_gg) 

N_qg (with acceptance |eta|)/ (N_qq + N_qg + N_gq + N_gg)

N_gq (with acceptance |eta|)/ (N_qq + N_qg + N_gq + N_gg)

N_gg (with acceptance |eta|)/ (N_qq + N_qg + N_gq + N_gg)   fractions with acceptance |eta| as a function of |eta|

 

 

 

 

 

 

 

 

Quality of the recontructed Jet   before and after the cut used are shown below  : di-Jets are

divided ln LHS  is with lager E_T and in RHS with smaller E_T

 

 

A. All the Jets

B. After E_T Cut