ThePEG  1.8.0
Public Member Functions | Static Public Member Functions | Private Member Functions | Static Private Attributes
ThePEG::ReweightBase Class Reference

The ReweightBase class is the base class of all objects representing external biases to matrix elements. More...

#include <ReweightBase.h>

Inheritance diagram for ThePEG::ReweightBase:
Inheritance graph
[legend]

List of all members.

Public Member Functions

virtual double weight () const =0
 Return the wieght for the kinematical configuation provided by the assigned XComb object (in the LastXCombInfo base class).
void setXComb (tXCombPtr xc)
 Assigne an XComb object with information about the sub-process to be used in the reweighting.
Standard constructors and destructors.
virtual ~ReweightBase ()
 Destructor.
Functions used by the persistent I/O system.
void persistentOutput (PersistentOStream &os) const
 Function used to write out object persistently.
void persistentInput (PersistentIStream &is, int version)
 Function used to read in object persistently.
- Public Member Functions inherited from ThePEG::LastXCombInfo<>
const XComblastXComb () const
 Return a reference to the last selected XComb.
tXCPtr lastXCombPtr () const
 Return a pointer to the last selected XComb.
const XComblastHeadXComb () const
 If the last selected XComb object belongs to a group of XComb's return a reference to the head XComb object for this group.
tXCPtr lastHeadXCombPtr () const
 If the last selected XComb object belongs to a group of XComb's return a pointer to the head XComb object for this group.
const EventHandlerlastEventHandler () const
 Return a reference to the currently used EventHandler.
tPExtrPtr lastExtractor () const
 A pointer to the currently used parton extractor.
PDFT pdf (tcPPtr parton) const
 Return the parton density used to extract the given parton.
const CutslastCuts () const
 A reference to the currently used kinematical cuts.
tCutsPtr lastCutsPtr () const
 A pointer to the currently used kinematical cuts.
const PPairlastParticles () const
 Return the pair of incoming parton instances.
Energy2 lastS () const
 The last generated total energy squared of the incoming particles.
const PPairlastPartons () const
 Return the pair of incoming parton instances.
Energy2 lastSHat () const
 The last used interval in total parton-parton energy squared.
double lastTau () const
 Return lastSHat()/lastS().
double lastY () const
 The generated rapidity of the hard scattering sub-system.
double lastP1 () const
 Log of one over the momentum fraction of the first incoming particle w.r.t.
double lastP2 () const
 Log of one over the momentum fraction of the second incoming particle w.r.t.
double lastL1 () const
 Log of one over the first incoming parton momentum fraction w.r.t.
double lastL2 () const
 Log of one over the second incoming parton momentum fraction w.r.t.
double lastX1 () const
 The first incoming parton momentum fraction w.r.t.
double lastX2 () const
 The second incoming parton momentum fraction w.r.t.
double lastE1 () const
 Return 1-lastX1() to highest possible precision for x $\rightarrow$ 1.
double lastE2 () const
 Return 1-lastX2() to highest possible precision for x $\rightarrow$ 1.
double lastFL1L2 () const
 The product of the parton density functions at the last generated phase-space point.
Energy2 lastScale () const
 The chosen scale of the hard scattering.
double lastAlphaS () const
 Get the $\alpha_S$ used in the hard scattering.
double lastAlphaEM () const
 Get the $\alpha_{EM}$ used in the hard scattering.
const vector< Lorentz5Momentum > & meMomenta () const
 Return the momenta of the incoming and outgoing partons to be used by the matrix element object, in the order specified by the TreeDiagram objects given by the matrix element.
double lastME2 () const
 Return the matrix element squared as calculated for the last phase space point.
double jacobian () const
 Get the last jacobian obtained when generating the kinematics for the call to dSigHatDR.
CrossSection lastMECrossSection () const
 Return the partonic cross section as calculated for the last phase space point.
double lastMEPDFWeight () const
 Return the PDF weight as calculated for the last phase space point, if the matrix element does supply PDF weights.
tSubProPtr subProcess () const
 Return the SubProcess object corresponding to the last generated sub-process.
const cPDVectormePartonData () const
 Return the incoming and outgoing parton types to be used by the matrix element object, in the order specified by the TreeDiagram objects given by the matrix element.

Static Public Member Functions

static void Init ()
 Standard Init function used to initialize the interfaces.

Private Member Functions

ReweightBaseoperator= (const ReweightBase &)
 Private and non-existent assignment operator.

Static Private Attributes

static
AbstractClassDescription
< ReweightBase
initReweightBase
 Describe an abstract base class with persistent data.

Additional Inherited Members

- Public Types inherited from ThePEG::LastXCombInfo<>
typedef ThePEG::Ptr< XComb >
::pointer 
XCPtr
 Alias for a reference counted pointer to XC .
typedef ThePEG::Ptr< XComb >
::const_pointer 
cXCPtr
 Alias for a reference counted pointer to a const XC .
typedef ThePEG::Ptr< XComb >
::transient_pointer 
tXCPtr
 Alias for a transient pointer to XC .
typedef ThePEG::Ptr< XComb >
::transient_const_pointer 
tcXCPtr
 Alias for a transient pointer to a const XC .
- Protected Attributes inherited from ThePEG::LastXCombInfo<>
XCPtr theLastXComb
 The pointer to the last selected XComb.

Detailed Description

The ReweightBase class is the base class of all objects representing external biases to matrix elements.

These can be used to enhance certain matrix elements or certain phase space regions. They can be used in two ways, either to completely change the matrix element (re-weight), in which case the total cross section will be affected or, when using weighted events in an EventHandler, to pre-weight certain events but leaving the cross section unchanged

There is only one virtual function which must be overridden in derived classes: weight().

See also:
The interfaces defined for ReweightBase.
MEBase
EventHandler
SubProcessHandler

Definition at line 39 of file ReweightBase.h.


Member Function Documentation

void ThePEG::ReweightBase::persistentInput ( PersistentIStream is,
int  version 
)

Function used to read in object persistently.

Parameters:
isthe persistent input stream read from.
versionthe version number of the object when written.

Reimplemented from ThePEG::Interfaced.

Reimplemented in ThePEG::ReweightConstant, and ThePEG::ReweightMinPT.

void ThePEG::ReweightBase::persistentOutput ( PersistentOStream os) const

Function used to write out object persistently.

Parameters:
osthe persistent output stream written to.

Reimplemented from ThePEG::Interfaced.

Reimplemented in ThePEG::ReweightConstant, and ThePEG::ReweightMinPT.


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