Line data    Source code

       1             : // WeakShowerMEs.h is a part of the PYTHIA event generator.
       2             : // Copyright (C) 2015 Torbjorn Sjostrand.
       3             : // PYTHIA is licenced under the GNU GPL version 2, see COPYING for details.
       4             : // Please respect the MCnet Guidelines, see GUIDELINES for details.
       5             : 
       6             : // Header file for the class containg matrix elements needed for
       7             : // W/Z emission corrections in both the initial and final state shower.
       8             : // WeakShowerMEs: contains the matrix elements.
       9             : 
      10             : #ifndef Pythia8_WeakShowerMEs_H
      11             : #define Pythia8_WeakShowerMEs_H
      12             : 
      13             : #include "Pythia8/Basics.h"
      14             : 
      15             : namespace Pythia8 {
      16             : 
      17             : //==========================================================================
      18             : 
      19             : // The WeakShowerMEs provides ME's needed for W/Z emission in ISR or FSR.
      20             : 
      21             : class WeakShowerMEs {
      22             : 
      23             : public:
      24             : 
      25             :   // Constructor.
      26           0 :   WeakShowerMEs() {}
      27             : 
      28             :   // Calculate the 2 to 2 ME uG -> uG, up to a known overall factor.
      29             :   double getTchanneluGuGME(double sHat,double tHat,double uHat);
      30             : 
      31             :   // Calculate the 2 to 2 ME ud -> ud, up to a known overall factor.
      32             :   double getTchannelududME(double sHat,double tHat,double uHat);
      33             : 
      34             :   // Calculate the 2 to 2 ME uu -> uu, up to a known overall factor.
      35             :   double getTchanneluuuuME(double sHat,double tHat,double uHat);
      36             : 
      37             :   // Calculate the 2 to 3 ME uG -> uGZ, up to a known overall factor.
      38             :   double getTchanneluGuGZME(Vec4 p1,Vec4 p2,Vec4 p3,Vec4 p4,Vec4 p5);
      39             : 
      40             :   // Calculate the 2 to 3 ME ud -> udZ, up to a known overall factor,
      41             :   // and with the coupling between Z and d set to zero.
      42             :   double getTchannelududZME(Vec4 p1,Vec4 p2,Vec4 p3,Vec4 p4,Vec4 p5);
      43             : 
      44             : };
      45             : 
      46             : //==========================================================================
      47             : 
      48             : } // end namespace Pythia8
      49             : 
      50             : #endif // Pythia8_WeakShowerMEs_H