fastjet::JetDefinition::DefaultRecombiner Class Reference [Advanced usage]

A class that will provide the recombination scheme facilities and/or allow a user to extend these facilities. More...

#include <JetDefinition.hh>

Inheritance diagram for fastjet::JetDefinition::DefaultRecombiner:

Collaboration diagram for fastjet::JetDefinition::DefaultRecombiner:

List of all members.

Public Member Functions
	DefaultRecombiner (RecombinationScheme recomb_scheme=E_scheme)
virtual std::string	description () const
	return a textual description of the recombination scheme implemented here
virtual void	recombine (const PseudoJet &pa, const PseudoJet &pb, PseudoJet &pab) const
	recombine pa and pb and put result into pab
virtual void	preprocess (PseudoJet &p) const
	routine called to preprocess each input jet (to make all input jets compatible with the scheme requirements (e.g.
RecombinationScheme	scheme () const
	return the index of the recombination scheme

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Detailed Description

A class that will provide the recombination scheme facilities and/or allow a user to extend these facilities.

This class is derived from the (abstract) class Recombiner. It simply "sums" PseudoJets using a specified recombination scheme (E-scheme by default)

Definition at line 385 of file JetDefinition.hh.

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Member Function Documentation

void fastjet::JetDefinition::DefaultRecombiner::preprocess

(

PseudoJet &

)

const [virtual]

routine called to preprocess each input jet (to make all input jets compatible with the scheme requirements (e.g.

massless).

Reimplemented from fastjet::JetDefinition::Recombiner.

Definition at line 216 of file JetDefinition.cc.

References fastjet::BIpt2_scheme, fastjet::BIpt_scheme, fastjet::E_scheme, fastjet::Et2_scheme, fastjet::Et_scheme, fastjet::PseudoJet::perp2(), fastjet::pt2_scheme, fastjet::pt_scheme, fastjet::PseudoJet::set_user_index(), and fastjet::PseudoJet::user_index().

                                                                   {
  switch(_recomb_scheme) {
  case E_scheme:
  case BIpt_scheme:
  case BIpt2_scheme:
    break;
  case pt_scheme:
  case pt2_scheme:
    {
      // these schemes (as in the ktjet implementation) need massless
      // initial 4-vectors with essentially E=|p|.
      double newE = sqrt(p.perp2()+p.pz()*p.pz());
      int    user_index = p.user_index();
      p = PseudoJet(p.px(), p.py(), p.pz(), newE);
      p.set_user_index(user_index);
    }
    break;
  case Et_scheme:
  case Et2_scheme:
    {
      // these schemes (as in the ktjet implementation) need massless
      // initial 4-vectors with essentially E=|p|.
      double rescale = p.E()/sqrt(p.perp2()+p.pz()*p.pz());
      int    user_index = p.user_index();
      p = PseudoJet(rescale*p.px(), rescale*p.py(), rescale*p.pz(), p.E());
      p.set_user_index(user_index);
    }
    break;
  default:
    ostringstream err;
    err << "DefaultRecombiner: unrecognized recombination scheme " 
        << _recomb_scheme;
    throw Error(err.str());
  }
}

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

• include/fastjet/JetDefinition.hh
• src/JetDefinition.cc