Atlfast::JetRecalibrator Class Reference

Recalibrates jets according to the results of tagging. More...

#include <JetRecalibrator.h>

List of all members.

Public Member Functions
	JetRecalibrator ()
double	bCalibrate (double pt)
double	uCalibrate (float pt)

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Detailed Description

Recalibrates jets according to the results of tagging.

Definition at line 10 of file JetRecalibrator.h.

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Constructor & Destructor Documentation

Atlfast::JetRecalibrator::JetRecalibrator

(

)

[inline]

Constructor

Definition at line 14 of file JetRecalibrator.h.

{}

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Member Function Documentation

double Atlfast::JetRecalibrator::bCalibrate

(

double

pt

)

[inline]

Calibrate according to b-jet hypothesis

Definition at line 17 of file JetRecalibrator.h.

                                {

      //Convert to GeV
      pt=pt/GeV;

      //b jets
      float core, a0, a1, a2, a3, a4, a5;
      
      if(pt < 10.){ return 0;
      } else if ( pt < 55.0) {    
        a0 =   1.2715;     
        a1 =   .12241;     
        a2 =  -.10480E-01;         
        a3 =  +.33310E-03;         
        a4 =  -.47454E-05;         
        a5 =   .25436E-07;         
        core =   a0 + a1*pt + a2*pt*pt + a3*pt*pt*pt 
          + a4*pt*pt*pt*pt + a5*pt*pt*pt*pt*pt;
        core =   core * 1.006;
        core = core * pt * GeV;
        return core;
      } else {
        a0 =   1.18;       
        a1 =   -.16672E-02;        
        a2 =    .44414E-05;        
        core = a0+a1*pt + a2*pt*pt;

        //convert back to original units
        core = core * pt* GeV;
        return core;
      }
    }

double Atlfast::JetRecalibrator::uCalibrate

(

float

pt

)

[inline]

Calibrate according to light-jet hypothesis

Definition at line 51 of file JetRecalibrator.h.

                                {

      //Convert to GeV
      pt=pt/GeV;


      //  calibrate u-jets 

      float core, a0, a1, a2, a3, a4, a5;
      
      if(pt < 10.){ return 0;
      } else if ( pt < 45.0) {    
        a0 =  1.5085;      
        a1 =   .31468E-01;         
        a2 =  -.36973E-02;         
        a3 =  +.11220E-03;         
        a4 =  -.13921E-05;         
        a5 =   .61538E-08;         
        core =    a0 + a1*pt + a2*pt*pt + a3*pt*pt*pt 
          + a4*pt*pt*pt*pt + a5*pt*pt*pt*pt*pt;
        core = core * pt * GeV;
        return core;
       } else {
         a0 =   1.18;      
         a1 =   -.16672E-02;       
         a2 =    .44414E-05 ;      
         core =   a0 + a1*pt + a2*pt*pt;
         core =   core/1.25;

        //convert back to original units
         core = core * pt * GeV;
         return core;
       }
    }

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The documentation for this class was generated from the following file:

• /afs/cern.ch/user/s/sdean/project_builds/AtlasOffline-rel_1/Simulation/Atlfast/AtlfastAlgs/AtlfastAlgs/JetRecalibrator.h

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