Class to contain pseudojets, including minimal information of use to jet-clustering routines. More...

#include <fastjet/PseudoJet.hh>

Collaboration diagram for fastjet::PseudoJet:

Classes
class	InexistentUserInfo
	error class to be thrown if accessing user info when it doesn't exist More...

class	UserInfoBase
	a base class to hold extra user information in a PseudoJet More...

Public Types
enum	{ X =0, Y =1, Z =2, T =3, NUM_COORDINATES =4, SIZE =NUM_COORDINATES }

Public Member Functions
template<>
	PseudoJet (const siscone::Cmomentum &four_vector)
	shortcut for converting siscone Cmomentum into PseudoJet

template<>
	PseudoJet (const siscone_spherical::CSphmomentum &four_vector)
	shortcut for converting siscone CSphmomentum into PseudoJet

Constructors and destructor
	PseudoJet ()
	default constructor, which as of FJ3.0 provides an object for which all operations are now valid and which has zero momentum

	PseudoJet (const double px, const double py, const double pz, const double E)
	construct a pseudojet from explicit components

template<class L >
	PseudoJet (const L &some_four_vector)
	constructor from any object that has px,py,pz,E = some_four_vector[0–3],

	PseudoJet (bool)

virtual	~PseudoJet ()
	default (virtual) destructor

Kinematic access functions
double	E () const

double	e () const

double	px () const

double	py () const

double	pz () const

double	phi () const
	returns phi (in the range 0..2pi)

double	phi_std () const
	returns phi in the range -pi..pi

double	phi_02pi () const
	returns phi in the range 0..2pi

double	rap () const
	returns the rapidity or some large value when the rapidity is infinite

double	rapidity () const
	the same as rap()

double	pseudorapidity () const
	returns the pseudo-rapidity or some large value when the rapidity is infinite

double	eta () const

double	pt2 () const
	returns the squared transverse momentum

double	pt () const
	returns the scalar transverse momentum

double	perp2 () const
	returns the squared transverse momentum

double	perp () const
	returns the scalar transverse momentum

double	kt2 () const
	returns the squared transverse momentum

double	m2 () const
	returns the squared invariant mass // like CLHEP

double	m () const
	returns the invariant mass (If m2() is negative then -sqrt(-m2()) is returned, as in CLHEP)

double	mperp2 () const
	returns the squared transverse mass = kt^2+m^2

double	mperp () const
	returns the transverse mass = sqrt(kt^2+m^2)

double	mt2 () const
	returns the squared transverse mass = kt^2+m^2

double	mt () const
	returns the transverse mass = sqrt(kt^2+m^2)

double	modp2 () const
	return the squared 3-vector modulus = px^2+py^2+pz^2

double	modp () const
	return the 3-vector modulus = sqrt(px^2+py^2+pz^2)

double	Et () const
	return the transverse energy

double	Et2 () const
	return the transverse energy squared

double	operator() (int i) const
	returns component i, where X==0, Y==1, Z==2, E==3

double	operator[] (int i) const
	returns component i, where X==0, Y==1, Z==2, E==3

double	kt_distance (const PseudoJet &other) const
	returns kt distance (R=1) between this jet and another

double	plain_distance (const PseudoJet &other) const
	returns squared cylinder (rap-phi) distance between this jet and another

double	squared_distance (const PseudoJet &other) const
	returns squared cylinder (rap-phi) distance between this jet and another

double	delta_R (const PseudoJet &other) const
	return the cylinder (rap-phi) distance between this jet and another, $\Delta_R = \sqrt{\Delta y^2 + \Delta \phi^2}$ . More...

double	delta_phi_to (const PseudoJet &other) const
	returns other.phi() - this.phi(), constrained to be in range -pi . More...

double	beam_distance () const
	returns distance between this jet and the beam

std::valarray< double >	four_mom () const
	return a valarray containing the four-momentum (components 0-2 are 3-mom, component 3 is energy). More...

Kinematic modification functions
PseudoJet &	boost (const PseudoJet &prest)
	transform this jet (given in the rest frame of prest) into a jet in the lab frame [NOT FULLY TESTED] More...

PseudoJet &	unboost (const PseudoJet &prest)
	transform this jet (given in lab) into a jet in the rest frame of prest [NOT FULLY TESTED] More...

void	operator*= (double)
	multiply the jet's momentum by the coefficient

void	operator/= (double)
	divide the jet's momentum by the coefficient

void	operator+= (const PseudoJet &)
	add the other jet's momentum to this jet

void	operator-= (const PseudoJet &)
	subtract the other jet's momentum from this jet

void	reset (double px, double py, double pz, double E)
	reset the 4-momentum according to the supplied components and put the user and history indices back to their default values

void	reset (const PseudoJet &psjet)
	reset the PseudoJet to be equal to psjet (including its indices); NB if the argument is derived from a PseudoJet then the "reset" used will be the templated version More...

template<class L >
void	reset (const L &some_four_vector)
	reset the 4-momentum according to the supplied generic 4-vector (accessible via indexing, [0]==px,...[3]==E) and put the user and history indices back to their default values. More...

void	reset_PtYPhiM (double pt_in, double y_in, double phi_in, double m_in=0.0)
	reset the PseudoJet according to the specified pt, rapidity, azimuth and mass (also resetting indices, etc.) (phi should satisfy -2pi<phi<4pi)

void	reset_momentum (double px, double py, double pz, double E)
	reset the 4-momentum according to the supplied components but leave all other information (indices, user info, etc.) untouched

void	reset_momentum (const PseudoJet &pj)
	reset the 4-momentum according to the components of the supplied PseudoJet, including cached components; note that the template version (below) will be called for classes derived from PJ. More...

void	reset_momentum_PtYPhiM (double pt, double y, double phi, double m=0.0)
	reset the 4-momentum according to the specified pt, rapidity, azimuth and mass (phi should satisfy -2pi<phi<4pi)

template<class L >
void	reset_momentum (const L &some_four_vector)
	reset the 4-momentum according to the supplied generic 4-vector (accessible via indexing, [0]==px,...[3]==E), but leave all other information (indices, user info, etc.) untouched

void	set_cached_rap_phi (double rap, double phi)
	in some cases when setting a 4-momentum, the user/program knows what rapidity and azimuth are associated with that 4-momentum; by calling this routine the user can provide the information directly to the PseudoJet and avoid expensive rap-phi recalculations. More...

User index functions
To allow the user to set and access an integer index which can be exploited by the user to associate extra information with a particle/jet (for example pdg id, or an indication of a particle's origin within the user's analysis)
int	user_index () const
	return the user_index,

void	set_user_index (const int index)
	set the user_index, intended to allow the user to add simple identifying information to a particle/jet

User information types and functions
Allows PseudoJet to carry extra user info (as an object derived from UserInfoBase).
void	set_user_info (UserInfoBase *user_info_in)
	sets the internal shared pointer to the user information. More...

template<class L >
const L &	user_info () const
	returns a reference to the dynamic cast conversion of user_info to type L. More...

bool	has_user_info () const
	returns true if the PseudoJet has user information

template<class L >
bool	has_user_info () const
	returns true if the PseudoJet has user information than can be cast to the template argument type. More...

const UserInfoBase *	user_info_ptr () const
	retrieve a pointer to the (const) user information

const SharedPtr< UserInfoBase > &	user_info_shared_ptr () const
	retrieve a (const) shared pointer to the user information

SharedPtr< UserInfoBase > &	user_info_shared_ptr ()
	retrieve a (non-const) shared pointer to the user information; you can use this, for example, to set the shared pointer, eg More...

Description
Since a PseudoJet can have a structure that contains a variety of information, we provide a description that allows one to check exactly what kind of PseudoJet we are dealing with
std::string	description () const
	return a string describing what kind of PseudoJet we are dealing with

Access to the associated ClusterSequence object.
In addition to having kinematic information, jets may contain a reference to an associated ClusterSequence (this is the case, for example, if the jet has been returned by a ClusterSequence member function).
bool	has_associated_cluster_sequence () const
	returns true if this PseudoJet has an associated ClusterSequence.

bool	has_associated_cs () const
	shorthand for has_associated_cluster_sequence()

bool	has_valid_cluster_sequence () const
	returns true if this PseudoJet has an associated and still valid(ated) ClusterSequence. More...

bool	has_valid_cs () const
	shorthand for has_valid_cluster_sequence()

const ClusterSequence *	associated_cluster_sequence () const
	get a (const) pointer to the parent ClusterSequence (NULL if inexistent)

const ClusterSequence *	associated_cs () const

const ClusterSequence *	validated_cluster_sequence () const
	if the jet has a valid associated cluster sequence then return a pointer to it; otherwise throw an error

const ClusterSequence *	validated_cs () const
	shorthand for validated_cluster_sequence()

const ClusterSequenceAreaBase *	validated_cluster_sequence_area_base () const
	if the jet has valid area information then return a pointer to the associated ClusterSequenceAreaBase object; otherwise throw an error

const ClusterSequenceAreaBase *	validated_csab () const
	shorthand for validated_cluster_sequence_area_base()

Access to the associated PseudoJetStructureBase object.
In addition to having kinematic information, jets may contain a reference to an associated ClusterSequence (this is the case, for example, if the jet has been returned by a ClusterSequence member function).
void	set_structure_shared_ptr (const SharedPtr< PseudoJetStructureBase > &structure)
	set the associated structure

bool	has_structure () const
	return true if there is some structure associated with this PseudoJet

const PseudoJetStructureBase *	structure_ptr () const
	return a pointer to the structure (of type PseudoJetStructureBase*) associated with this PseudoJet. More...

PseudoJetStructureBase *	structure_non_const_ptr ()
	return a non-const pointer to the structure (of type PseudoJetStructureBase*) associated with this PseudoJet. More...

const PseudoJetStructureBase *	validated_structure_ptr () const
	return a pointer to the structure (of type PseudoJetStructureBase*) associated with this PseudoJet. More...

const SharedPtr < PseudoJetStructureBase > &	structure_shared_ptr () const
	return a reference to the shared pointer to the PseudoJetStructureBase associated with this PseudoJet

template<typename StructureType >
const StructureType &	structure () const
	returns a reference to the structure casted to the requested structure type More...

template<typename TransformerType >
bool	has_structure_of () const
	check if the PseudoJet has the structure resulting from a Transformer (that is, its structure is compatible with a Transformer::StructureType). More...

template<typename TransformerType >
const TransformerType::StructureType &	structure_of () const
	this is a helper to access any structure created by a Transformer (that is, of type Transformer::StructureType). More...

Methods for access to information about jet structure
These allow access to jet constituents, and other jet subtructure information. They only work if the jet is associated with a ClusterSequence.
virtual bool	has_partner (PseudoJet &partner) const
	check if it has been recombined with another PseudoJet in which case, return its partner through the argument. More...

virtual bool	has_child (PseudoJet &child) const
	check if it has been recombined with another PseudoJet in which case, return its child through the argument. More...

virtual bool	has_parents (PseudoJet &parent1, PseudoJet &parent2) const
	check if it is the product of a recombination, in which case return the 2 parents through the 'parent1' and 'parent2' arguments. More...

virtual bool	contains (const PseudoJet &constituent) const
	check if the current PseudoJet contains the one passed as argument. More...

virtual bool	is_inside (const PseudoJet &jet) const
	check if the current PseudoJet is contained the one passed as argument. More...

virtual bool	has_constituents () const
	returns true if the PseudoJet has constituents

virtual std::vector< PseudoJet >	constituents () const
	retrieve the constituents. More...

virtual bool	has_exclusive_subjets () const
	returns true if the PseudoJet has support for exclusive subjets

std::vector< PseudoJet >	exclusive_subjets (const double dcut) const
	return a vector of all subjets of the current jet (in the sense of the exclusive algorithm) that would be obtained when running the algorithm with the given dcut. More...

int	n_exclusive_subjets (const double dcut) const
	return the size of exclusive_subjets(...); still n ln n with same coefficient, but marginally more efficient than manually taking exclusive_subjets.size() More...

std::vector< PseudoJet >	exclusive_subjets (int nsub) const
	return the list of subjets obtained by unclustering the supplied jet down to nsub subjets. More...

std::vector< PseudoJet >	exclusive_subjets_up_to (int nsub) const
	return the list of subjets obtained by unclustering the supplied jet down to nsub subjets (or all constituents if there are fewer than nsub). More...

double	exclusive_subdmerge (int nsub) const
	Returns the dij that was present in the merging nsub+1 -> nsub subjets inside this jet. More...

double	exclusive_subdmerge_max (int nsub) const
	Returns the maximum dij that occurred in the whole event at the stage that the nsub+1 -> nsub merge of subjets occurred inside this jet. More...

virtual bool	has_pieces () const
	returns true if a jet has pieces More...

virtual std::vector< PseudoJet >	pieces () const
	retrieve the pieces that make up the jet. More...

virtual bool	has_area () const
	check if it has a defined area

virtual double	area () const
	return the jet (scalar) area. More...

virtual double	area_error () const
	return the error (uncertainty) associated with the determination of the area of this jet. More...

virtual PseudoJet	area_4vector () const
	return the jet 4-vector area. More...

virtual bool	is_pure_ghost () const
	true if this jet is made exclusively of ghosts. More...

Members mainly intended for internal use
int	cluster_hist_index () const
	return the cluster_hist_index, intended to be used by clustering routines. More...

void	set_cluster_hist_index (const int index)
	set the cluster_hist_index, intended to be used by clustering routines.

int	cluster_sequence_history_index () const
	alternative name for cluster_hist_index() [perhaps more meaningful]

void	set_cluster_sequence_history_index (const int index)
	alternative name for set_cluster_hist_index(...) [perhaps more meaningful]

Protected Attributes
SharedPtr< PseudoJetStructureBase >	_structure

SharedPtr< UserInfoBase >	_user_info

Friends
PseudoJet	operator* (double, const PseudoJet &)

Detailed Description

Class to contain pseudojets, including minimal information of use to jet-clustering routines.

Definition at line 67 of file PseudoJet.hh.

Member Function Documentation

double fastjet::PseudoJet::delta_R ( const PseudoJet & other ) const

inline

return the cylinder (rap-phi) distance between this jet and another, $\Delta_R = \sqrt{\Delta y^2 + \Delta \phi^2}$ .

Definition at line 191 of file PseudoJet.hh.

double fastjet::PseudoJet::delta_phi_to ( const PseudoJet & other ) const

returns other.phi() - this.phi(), constrained to be in range -pi .

returns other.phi() - this.phi(), i.e.

. pi

the phi distance to other, constrained to be in range -pi .. pi

Definition at line 401 of file PseudoJet.cc.

valarray< double > fastjet::PseudoJet::four_mom ( ) const

return a valarray containing the four-momentum (components 0-2 are 3-mom, component 3 is energy).

Definition at line 116 of file PseudoJet.cc.

PseudoJet & fastjet::PseudoJet::boost ( const PseudoJet & prest )

transform this jet (given in the rest frame of prest) into a jet in the lab frame [NOT FULLY TESTED]

transform this jet (given in the rest frame of prest) into a jet in the lab frame

Definition at line 282 of file PseudoJet.cc.

PseudoJet & fastjet::PseudoJet::unboost ( const PseudoJet & prest )

transform this jet (given in lab) into a jet in the rest frame of prest [NOT FULLY TESTED]

transform this jet (given in lab) into a jet in the rest frame of prest

Definition at line 309 of file PseudoJet.cc.

void fastjet::PseudoJet::reset ( const PseudoJet & psjet )

inline

reset the PseudoJet to be equal to psjet (including its indices); NB if the argument is derived from a PseudoJet then the "reset" used will be the templated version

Note: this is included on top of the templated version because PseudoJet is not "derived" from PseudoJet, so the templated reset would not handle this case properly.

Definition at line 244 of file PseudoJet.hh.

template<class L >

void fastjet::PseudoJet::reset ( const L & some_four_vector )

inline

reset the 4-momentum according to the supplied generic 4-vector (accessible via indexing, [0]==px,...[3]==E) and put the user and history indices back to their default values.

Definition at line 251 of file PseudoJet.hh.

void fastjet::PseudoJet::reset_momentum ( const PseudoJet & pj )

inline

reset the 4-momentum according to the components of the supplied PseudoJet, including cached components; note that the template version (below) will be called for classes derived from PJ.

Definition at line 943 of file PseudoJet.hh.

void fastjet::PseudoJet::set_cached_rap_phi	(	double	rap,
		double	phi
	)

in some cases when setting a 4-momentum, the user/program knows what rapidity and azimuth are associated with that 4-momentum; by calling this routine the user can provide the information directly to the PseudoJet and avoid expensive rap-phi recalculations.

Parameters

rap rapidity
Parameters

phi (in range -twopi...4*pi)

USE WITH CAUTION: there are no checks that the rapidity and azimuth supplied are sensible, nor does this reset the 4-momentum components if things don't match.

Definition at line 340 of file PseudoJet.cc.

void fastjet::PseudoJet::set_user_info ( UserInfoBase * user_info_in )

inline

sets the internal shared pointer to the user information.

Note that the PseudoJet will now own the pointer, and delete the corresponding object when it (the jet, and any copies of the jet) goes out of scope.

Definition at line 387 of file PseudoJet.hh.

template<class L >

const L& fastjet::PseudoJet::user_info ( ) const

inline

returns a reference to the dynamic cast conversion of user_info to type L.

Usage: suppose you have previously set the user info with a pointer to an object of type MyInfo,

class MyInfo: public PseudoJet::UserInfoBase { MyInfo(int id) : _pdg_id(id); int pdg_id() const {return _pdg_id;} int _pdg_id; };

PseudoJet particle(...); particle.set_user_info(new MyInfo(its_pdg_id));

Then you would access that pdg_id() as

particle.user_info<MyInfo>().pdg_id();

It's overkill for just a single integer, but scales easily to more extensive information.

Note that user_info() throws an InexistentUserInfo() error if there is no user info; throws a std::bad_cast if the conversion doesn't work

If this behaviour does not fit your needs, use instead the the user_info_ptr() or user_info_shared_ptr() member functions.

Definition at line 420 of file PseudoJet.hh.

template<class L >

bool fastjet::PseudoJet::has_user_info ( ) const

inline

returns true if the PseudoJet has user information than can be cast to the template argument type.

Definition at line 433 of file PseudoJet.hh.

SharedPtr<UserInfoBase>& fastjet::PseudoJet::user_info_shared_ptr ( )

inline

retrieve a (non-const) shared pointer to the user information; you can use this, for example, to set the shared pointer, eg

p2.user_info_shared_ptr() = p1.user_info_shared_ptr();

or

SharedPtr<PseudoJet::UserInfoBase> info_shared(new MyInfo(...));

p2.user_info_shared_ptr() = info_shared;

Definition at line 462 of file PseudoJet.hh.

bool fastjet::PseudoJet::has_valid_cluster_sequence ( ) const

returns true if this PseudoJet has an associated and still valid(ated) ClusterSequence.

Definition at line 447 of file PseudoJet.cc.

const PseudoJetStructureBase * fastjet::PseudoJet::structure_ptr ( ) const

return a pointer to the structure (of type PseudoJetStructureBase*) associated with this PseudoJet.

return NULL if there is no associated structure

Definition at line 479 of file PseudoJet.cc.

PseudoJetStructureBase * fastjet::PseudoJet::structure_non_const_ptr ( )

return a non-const pointer to the structure (of type PseudoJetStructureBase*) associated with this PseudoJet.

return NULL if there is no associated structure

Only use this if you know what you are doing. In any case, prefer the 'structure_ptr()' (the const version) to this method, unless you really need a write access to the PseudoJet's underlying structure.

Definition at line 494 of file PseudoJet.cc.

const PseudoJetStructureBase * fastjet::PseudoJet::validated_structure_ptr ( ) const

return a pointer to the structure (of type PseudoJetStructureBase*) associated with this PseudoJet.

throw an error if there is no associated structure

Definition at line 504 of file PseudoJet.cc.

template<typename StructureType >

const StructureType & fastjet::PseudoJet::structure ( ) const

returns a reference to the structure casted to the requested structure type

If there is no structure associated, an Error is thrown. If the type is not met, a std::bad_cast error is thrown.

Definition at line 963 of file PseudoJet.hh.

template<typename TransformerType >

bool fastjet::PseudoJet::has_structure_of ( ) const

check if the PseudoJet has the structure resulting from a Transformer (that is, its structure is compatible with a Transformer::StructureType).

If there is no structure, false is returned.

Definition at line 971 of file PseudoJet.hh.

template<typename TransformerType >

const TransformerType::StructureType & fastjet::PseudoJet::structure_of ( ) const

this is a helper to access any structure created by a Transformer (that is, of type Transformer::StructureType).

If there is no structure, or if the structure is not compatible with TransformerType, an error is thrown.

Definition at line 981 of file PseudoJet.hh.

bool fastjet::PseudoJet::has_partner ( PseudoJet & partner ) const

virtual

check if it has been recombined with another PseudoJet in which case, return its partner through the argument.

Otherwise, 'partner' is set to 0.

an Error is thrown if this PseudoJet has no currently valid associated ClusterSequence

Definition at line 525 of file PseudoJet.cc.

bool fastjet::PseudoJet::has_child ( PseudoJet & child ) const

virtual

check if it has been recombined with another PseudoJet in which case, return its child through the argument.

Otherwise, 'child' is set to 0.

an Error is thrown if this PseudoJet has no currently valid associated ClusterSequence

Definition at line 536 of file PseudoJet.cc.

bool fastjet::PseudoJet::has_parents	(	PseudoJet &	parent1,
		PseudoJet &	parent2
	)		const

virtual

check if it is the product of a recombination, in which case return the 2 parents through the 'parent1' and 'parent2' arguments.

Otherwise, set these to 0.

an Error is thrown if this PseudoJet has no currently valid associated ClusterSequence

Definition at line 547 of file PseudoJet.cc.

bool fastjet::PseudoJet::contains ( const PseudoJet & constituent ) const

virtual

check if the current PseudoJet contains the one passed as argument.

an Error is thrown if this PseudoJet has no currently valid associated ClusterSequence

Definition at line 557 of file PseudoJet.cc.

bool fastjet::PseudoJet::is_inside ( const PseudoJet & jet ) const

virtual

check if the current PseudoJet is contained the one passed as argument.

an Error is thrown if this PseudoJet has no currently valid associated ClusterSequence

Definition at line 567 of file PseudoJet.cc.

vector< PseudoJet > fastjet::PseudoJet::constituents ( ) const

virtual

retrieve the constituents.

an Error is thrown if this PseudoJet has no currently valid associated ClusterSequence or other substructure information

Definition at line 580 of file PseudoJet.cc.

std::vector< PseudoJet > fastjet::PseudoJet::exclusive_subjets ( const double dcut ) const

return a vector of all subjets of the current jet (in the sense of the exclusive algorithm) that would be obtained when running the algorithm with the given dcut.

Time taken is O(m ln m), where m is the number of subjets that are found. If m gets to be of order of the total number of constituents in the jet, this could be substantially slower than just getting that list of constituents.

an Error is thrown if this PseudoJet has no currently valid associated ClusterSequence

Definition at line 603 of file PseudoJet.cc.

int fastjet::PseudoJet::n_exclusive_subjets ( const double dcut ) const

return the size of exclusive_subjets(...); still n ln n with same coefficient, but marginally more efficient than manually taking exclusive_subjets.size()

an Error is thrown if this PseudoJet has no currently valid associated ClusterSequence

Definition at line 614 of file PseudoJet.cc.

std::vector< PseudoJet > fastjet::PseudoJet::exclusive_subjets ( int nsub ) const

return the list of subjets obtained by unclustering the supplied jet down to nsub subjets.

Throws an error if there are fewer than nsub particles in the jet.

For ClusterSequence type jets, requires nsub ln nsub time

An Error is thrown if this PseudoJet has no currently valid associated ClusterSequence

Definition at line 634 of file PseudoJet.cc.

std::vector< PseudoJet > fastjet::PseudoJet::exclusive_subjets_up_to ( int nsub ) const

return the list of subjets obtained by unclustering the supplied jet down to nsub subjets (or all constituents if there are fewer than nsub).

For ClusterSequence type jets, requires nsub ln nsub time

An Error is thrown if this PseudoJet has no currently valid associated ClusterSequence

Definition at line 627 of file PseudoJet.cc.

double fastjet::PseudoJet::exclusive_subdmerge ( int nsub ) const

Returns the dij that was present in the merging nsub+1 -> nsub subjets inside this jet.

Returns 0 if there were nsub or fewer constituents in the jet.

an Error is thrown if this PseudoJet has no currently valid associated ClusterSequence

Definition at line 651 of file PseudoJet.cc.

double fastjet::PseudoJet::exclusive_subdmerge_max ( int nsub ) const

Returns the maximum dij that occurred in the whole event at the stage that the nsub+1 -> nsub merge of subjets occurred inside this jet.

Returns 0 if there were nsub or fewer constituents in the jet.

an Error is thrown if this PseudoJet has no currently valid associated ClusterSequence

Definition at line 662 of file PseudoJet.cc.

bool fastjet::PseudoJet::has_pieces ( ) const

virtual

returns true if a jet has pieces

By default a single particle or a jet coming from a ClusterSequence have no pieces and this methos will return false.

In practice, this is equivalent to have an structure of type CompositeJetStructure.

Definition at line 671 of file PseudoJet.cc.

std::vector< PseudoJet > fastjet::PseudoJet::pieces ( ) const

virtual

retrieve the pieces that make up the jet.

If the jet does not support pieces, an error is throw

Definition at line 680 of file PseudoJet.cc.

double fastjet::PseudoJet::area ( ) const

virtual

return the jet (scalar) area.

throws an Error if there is no support for area in the parent CS

Definition at line 717 of file PseudoJet.cc.

double fastjet::PseudoJet::area_error ( ) const

virtual

return the error (uncertainty) associated with the determination of the area of this jet.

throws an Error if there is no support for area in the parent CS

Definition at line 725 of file PseudoJet.cc.

PseudoJet fastjet::PseudoJet::area_4vector ( ) const

virtual

return the jet 4-vector area.

throws an Error if there is no support for area in the parent CS

Definition at line 732 of file PseudoJet.cc.

bool fastjet::PseudoJet::is_pure_ghost ( ) const

virtual

true if this jet is made exclusively of ghosts.

throws an Error if there is no support for area in the parent CS

Definition at line 739 of file PseudoJet.cc.

int fastjet::PseudoJet::cluster_hist_index ( ) const

inline

return the cluster_hist_index, intended to be used by clustering routines.

Definition at line 770 of file PseudoJet.hh.

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

include/fastjet/PseudoJet.hh
src/PseudoJet.cc
plugins/SISCone/SISConePlugin.cc
plugins/SISCone/SISConeSphericalPlugin.cc

Classes

Public Types

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Detailed Description

Member Function Documentation