ThePEG
1.8.0
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The LuminosityFunction describes the momentum distribution of the incoming beams in an experiment. More...
#include <LuminosityFunction.h>
Public Member Functions | |
void | select (tXCombPtr) |
Set information about the selected XComb. | |
Standard constructors and destructors. | |
LuminosityFunction (Energy a=45.6 *GeV, Energy b=45.6 *GeV) | |
Default constructor. | |
Virtual functions to be overridden by sub-classes. | |
virtual bool | canHandle (const cPDPair &) const |
Return true if this luminosity function can actually handle a given pair of incoming particles. | |
virtual Energy | maximumCMEnergy () const |
Return the maximum possible center of mass energy for an event. | |
virtual LorentzRotation | getBoost () const |
Return the rotation needed to transform from the collision cm system to the labotatory system. | |
virtual double | Y () const |
Return the rapidity of the colliding particles (at the maximum energy) in the laboratory system. | |
virtual int | nDim (const cPDPair &) const |
How many random numbers are needed to generate a phase space point? Default is zero in which means the energy of the incoming particles is fixed. | |
virtual double | value (const cPDPair &, double l1, double l2) const |
The value of the luminosity function for the given particle types for the given energy fractions l1 and l2 ( ![]() | |
virtual pair< double, double > | generateLL (const double *r, double &jacobian) const |
Generate energy fractions l1 and l2 ( ![]() | |
Simple access functions | |
Energy | beamEMaxA () const |
The maximum energy of the beam entering along the positive z-axis. | |
Energy | beamEMaxB () const |
The maximum energy of the beam entering along the negative z-axis. | |
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. | |
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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. |
Protected Member Functions | |
void | beamEMaxA (Energy x) |
The maximum energy of the beam entering along the positive z-axis. | |
void | beamEMaxB (Energy x) |
The maximum energy of the beam entering along the negative z-axis. | |
Clone Methods. | |
virtual IBPtr | clone () const |
Make a simple clone of this object. | |
virtual IBPtr | fullclone () const |
Make a clone of this object, possibly modifying the cloned object to make it sane. |
Private Member Functions | |
LuminosityFunction & | operator= (const LuminosityFunction &) |
Private and non-existent assignment operator. |
Private Attributes | |
Energy | theBeamEMaxA |
The maximum energy of the beam entering along the positive z-axis. | |
Energy | theBeamEMaxB |
The maximum energy of the beam entering along the negative z-axis. |
Static Private Attributes | |
static ClassDescription < LuminosityFunction > | initLuminosityFunction |
Describe an abstract class with persistent data. |
Friends | |
class | EventHandler |
EventHandler is a friend. |
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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XCPtr | theLastXComb |
The pointer to the last selected XComb. |
The LuminosityFunction describes the momentum distribution of the incoming beams in an experiment.
This is used by a EventHandler to generate collisions in their CM system. The LuminosityFunction will be asked to produce a LorentzRotation giving the transformation to the laboratory system.
The LuminosityFunction inherits from the LastXCombInfo class to give easy access to the information of the generated primary sub-process in the selected XComb.
This base class implements simple fixed momentum beams with energies given by the BeamEMaxA and BeamEMaxB interfaces.
Definition at line 39 of file LuminosityFunction.h.
Default constructor.
Optionally the maximum energy of beam a and b can be given.
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protectedvirtual |
Make a simple clone of this object.
Implements ThePEG::InterfacedBase.
Reimplemented in ThePEG::FixedCMSLuminosity.
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protectedvirtual |
Make a clone of this object, possibly modifying the cloned object to make it sane.
Reimplemented from ThePEG::InterfacedBase.
Reimplemented in ThePEG::FixedCMSLuminosity.
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virtual |
Generate energy fractions l1 and l2 ( ) given 'nDim()' random numbers in the range ]0,1[ given by the iterators.
The jacobian argument must be multiplied by the jacobian of the variable transformation to l1 and l2. The default version is just a delta function with a jacobian of 1.
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virtual |
Return the rotation needed to transform from the collision cm system to the labotatory system.
This default version returns the unit transformation.
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virtual |
How many random numbers are needed to generate a phase space point? Default is zero in which means the energy of the incoming particles is fixed.
The only other reasonable values are 1 and 2.
void ThePEG::LuminosityFunction::persistentInput | ( | PersistentIStream & | is, |
int | version | ||
) |
Function used to read in object persistently.
is | the persistent input stream read from. |
version | the version number of the object when written. |
Reimplemented from ThePEG::Interfaced.
void ThePEG::LuminosityFunction::persistentOutput | ( | PersistentOStream & | os | ) | const |
Function used to write out object persistently.
os | the persistent output stream written to. |
Reimplemented from ThePEG::Interfaced.
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virtual |
The value of the luminosity function for the given particle types for the given energy fractions l1 and l2 ( ).
The default version returns 1 if l1 and l2 are zero otherwize zero.
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virtual |
Return the rapidity of the colliding particles (at the maximum energy) in the laboratory system.
This default version assumes the CM system is the same as the lab system and returns zero.
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friend |
EventHandler is a friend.
Definition at line 42 of file LuminosityFunction.h.