ThePEG
1.8.0
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The CascadeHandler is the base class of all handlers implementing perturbative partonic cascade models. More...
#include <CascadeHandler.h>
Public Member Functions | |
virtual void | cascade ()=0 |
The main function to be overwritten by sub-classes. | |
virtual double | reweightCKKW (int minMult, int maxMult) |
The CascadeHandler can be used inside the process generation to do so-called CKKW reweighting of the hard sub-process. | |
Standard constructors and destructors. | |
virtual | ~CascadeHandler () |
The destructor. | |
Virtual functions required by the StepHandler class. | |
virtual void | handle (EventHandler &eh, const tPVector &tagged, const Hint &hint) |
The main function called by the EventHandler class to perform a step. | |
Access information stored by the handle() function. | |
const tPVector & | tagged () const |
Return the vector of tagged particles which should be showered. | |
const Hint & | hint () const |
Return the int provided in the current call to handle(). | |
const PDF & | firstPDF () const |
Return references to the PDF used by the first incoming particle. | |
const PDF & | secondPDF () const |
Return references to the PDF used by the first incoming particle. | |
const pair< PDF, PDF > & | pdfs () const |
Return references to the currently used PDF's. | |
void | resetPDFs (const pair< tcPDFPtr, tcPDFPtr > &pdfpair) |
Set alternative PDFBase objects to be used for cascade. | |
void | setXComb (tXCombPtr xc) |
Set the XComb object with information about the sub-process generation. | |
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virtual | ~StepHandler () |
The destructor. | |
tEHPtr | eventHandler () const |
Get a pointer to the EventHandler which made the last call to handle(). | |
void | eventHandler (tEHPtr) |
Set a pointer to the EventHandler which made the last call to handle(). | |
tStepPtr | newStep () |
Return a pointer to a new step. | |
tStepPtr | currentStep () |
If a new step has been created, return it, otherwise return the current step from the eventHandler(). | |
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const XComb & | lastXComb () const |
Return a reference to the last selected XComb. | |
tXCPtr | lastXCombPtr () const |
Return a pointer to the last selected XComb. | |
const XComb & | lastHeadXComb () 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 EventHandler & | lastEventHandler () 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 Cuts & | lastCuts () const |
A reference to the currently used kinematical cuts. | |
tCutsPtr | lastCutsPtr () const |
A pointer to the currently used kinematical cuts. | |
const PPair & | lastParticles () const |
Return the pair of incoming parton instances. | |
Energy2 | lastS () const |
The last generated total energy squared of the incoming particles. | |
const PPair & | lastPartons () 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 ![]() | |
double | lastE2 () const |
Return 1-lastX2() to highest possible precision for x ![]() | |
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 ![]() | |
double | lastAlphaEM () const |
Get the ![]() | |
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 cPDVector & | mePartonData () 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 interface. |
Private Member Functions | |
CascadeHandler & | operator= (const CascadeHandler &) |
Private and non-existent assignment operator. |
Private Attributes | |
const tPVector * | theTagged |
Store the tagged argument given to handle(). | |
const Hint * | theHint |
Store the Hint arguments given to handle(). | |
pair< PDF, PDF > | thePDFs |
The pdfs used to extract the incoming partons. |
Static Private Attributes | |
static AbstractNoPIOClassDescription < CascadeHandler > | initCascadeHandler |
The static object used to initialize the description of this class. |
Additional Inherited Members | |
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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 . | |
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void | createNewStep () |
Use the collision handler to create a new step. | |
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XCPtr | theLastXComb |
The pointer to the last selected XComb. |
The CascadeHandler is the base class of all handlers implementing perturbative partonic cascade models.
It is derived from the more general StepHandler class, and implements the handle() function to do some standard initialization before calling the main cascade() function.
Definition at line 33 of file CascadeHandler.h.
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pure virtual |
The main function to be overwritten by sub-classes.
It is called by handle() after storing some information which is then available through simple access functions.
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virtual |
The main function called by the EventHandler class to perform a step.
eh | the EventHandler in charge of the Event generation. |
tagged | if not empty these are the only particles which should be considered by the StepHandler. |
hint | a Hint object with possible information from previously performed steps. |
Veto | if the StepHandler requires the current step to be discarded. |
Stop | if the generation of the current Event should be stopped after this call. |
Exception | if something goes wrong. |
Implements ThePEG::StepHandler.
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virtual |
The CascadeHandler can be used inside the process generation to do so-called CKKW reweighting of the hard sub-process.
In this case this function is called after information about the sub-process is made available through the LastXCombInfo base class. Only the function belonging to the primary CascadeHandler for the event to be generated is called. Sub-classes may implement it to give a suitable weight in return. The CascadeHandler may store information about the generated sub-process to be used in the subsequent cascade. It is however not guaranteed that the reweightCKKW() will have been called for the subprocess handed to the handle() function. This default implementation of the function simply return one. The current sub-process is mixed together with other processes with a multiplicity of outgoing particles between minMult and maxMult.
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inline |
Return the vector of tagged particles which should be showered.
It the vector is empty, the patons from the current sub-process is supposed to be showered.
Definition at line 102 of file CascadeHandler.h.
References theTagged.
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staticprivate |
The static object used to initialize the description of this class.
Indicates that this is an abstract class without persistent data.
Definition at line 166 of file CascadeHandler.h.