Internal ARICH track reconstruction. More...

#include <ARICHReconstruction.h>

Collaboration diagram for ARICHReconstruction:

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Public Member Functions
	ARICHReconstruction (int storePhotons=0)
	Constructor.

	~ARICHReconstruction ()
	Destructor.

void	initialize ()
	read geomerty parameters from xml and initialize class memebers

int	smearTrack (ARICHTrack &arichTrack)
	Smeares track parameters ("simulate" the uncertainties of tracking).

void	transformTrackToLocal (ARICHTrack &arichTrack, bool align)
	Transforms track parameters from global Belle2 to ARICH local frame.

int	likelihood2 (ARICHTrack &arichTrack, const StoreArray< ARICHHit > &arichHits, ARICHLikelihood &arichLikelihood)
	Computes the value of identity likelihood function for different particle hypotheses.

void	setTrackPositionResolution (double pRes)
	Sets track position resolution (from tracking)

void	setTrackAngleResolution (double aRes)
	Sets track direction resolution (from tracking)

void	useMirrorAlignment (bool align)
	use mirror alignment or not

void	correctEmissionPoint (int tileID, double r)
	correct mean emission point z position

Private Member Functions
int	InsideDetector (TVector3 a, int copyno)
	Returns 1 if vector "a" lies on "copyno"-th detector active surface of detector and 0 else.

TVector3	HitVirtualPosition (const TVector3 &hitpos, int mirrorID)
	Returns the hit virtual position, assuming that it was reflected from mirror. More...

TVector3	FastTracking (TVector3 dirf, TVector3 r, double refind, double z, int n, int opt)
	Calculates the intersection of the Cherenkov photon emitted from point "r" in "dirf" direction with the detector plane. More...

TVector3	FastTrackingSimple (TVector3 dirf, TVector3 r, double refind, double z, int n)
	Calculates the intersection of the Cherenkov photon emitted from point "r" in "dirf" direction with the detector plane. (For the case of simple (beamtest) geometry.) More...

int	CherenkovPhoton (TVector3 r, TVector3 rh, TVector3 &rf, TVector3 &dirf, double refind, double z, int n, int mirrorID=0)
	Calculates the direction of photon emission. More...

bool	HitsMirror (const TVector3 &pos, const TVector3 &dir, int mirrorID)
	returns true if photon at position pos with direction dir hits mirror plate with ID mirrorID

TVector3	getTrackMeanEmissionPosition (const ARICHTrack &track, int iAero)
	Returns mean emission position of Cherenkov photons from i-th aerogel layer.

TVector3	getTrackPositionAtZ (const ARICHTrack &track, double zout)
	Returns track direction at point with z coordinate "zout" (assumes straight track).

TVector3	getMirrorPoint (int mirrorID)
	Returns point on the mirror plate with id mirrorID.

TVector3	getMirrorNorm (int mirrorID)
	Returns normal vector of the mirror plate with id mirrorID.

Private Attributes
double	p_mass [c_noOfHypotheses]
	particle masses

DBObjPtr< ARICHGeometryConfig >	m_arichgp
	geometry configuration parameters from the DB

DBObjPtr< ARICHReconstructionPar >	m_recPars
	reconstruction parameters from the DB

DBObjPtr< ARICHChannelMask >	m_chnMask
	map of masked channels from the DB

DBObjPtr< ARICHChannelMapping >	m_chnMap
	map x,y channels to asic channels from the DB

DBObjPtr< ARICHGlobalAlignment >	m_alignp
	global alignment parameters from the DB

DBObjPtr< ARICHMirrorAlignment >	m_mirrAlign
	global alignment parameters from the DB

OptionalDBObjPtr< ARICHAeroTilesAlignment >	m_tileAlign
	alignment of aerogel tiles from DB

std::vector< TVector3 >	m_mirrorPoints
	vector of points on all mirror plates

std::vector< TVector3 >	m_mirrorNorms
	vector of nomal vectors of all mirror plates

double	m_trackPosRes
	track position resolution (from tracking)

double	m_trackAngRes
	track direction resolution (from tracking)

bool	m_alignMirrors
	if set to true mirror alignment constants from DB are used

unsigned int	m_nAerogelLayers
	number of aerogel layers

double	m_refractiveInd [c_noOfAerogels]
	refractive indices of aerogel layers

double	m_zaero [c_noOfAerogels]
	z-positions of aerogel layers

double	m_thickness [c_noOfAerogels]
	thicknesses of areogel layers

double	m_transmissionLen [c_noOfAerogels]
	transmission lengths of aerogel layers

double	m_n0 [c_noOfAerogels]
	number of emmited photons per unit length

TVector3	m_anorm [c_noOfAerogels]
	normal vector of the aerogle plane

int	m_storePhot
	set to 1 to store individual reconstructed photon information

double	m_tilePars [124][2] = {{0}}

Static Private Attributes
static const int	c_noOfHypotheses = Const::ChargedStable::c_SetSize
	Number of hypotheses to loop over.

static const int	c_noOfAerogels = 5
	Maximal number of aerogel layers to loop over.

Detailed Description

Internal ARICH track reconstruction.

The class contains objects and methods needed for internal ARICH track reconstruction. The main method is likelihood2, which returns the value of the likelihood function and number of expected photons for every input track and all hypotheses. For that purpose, the Cherenkov photon is generated for every track that hits the aerogel, by calling the CherenkovPhoton method. The photon is propagated (FastTracking) to the active area of the detection inside a HAPD and the intersection point with the active area is determined. Whether the photon was detected or not is determined by numerical simulation of the module's geometric acceptance.

Definition at line 48 of file ARICHReconstruction.h.

Member Function Documentation

◆ FastTrackingSimple()

TVector3 FastTrackingSimple	(	TVector3	dirf,
		TVector3	r,
		double *	refind,
		double *	z,
		int	n
	)

private

Calculates the intersection of the Cherenkov photon emitted from point "r" in "dirf" direction with the detector plane. (For the case of simple (beamtest) geometry.)

Parameters

r	vector of photon emission point
dirf	direction of photon emission
n	number of aerogel layers through which photon passes
refind	array of layers refractive indices
z	array of z coordinates of borders between layers

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

arich/modules/arichReconstruction/include/ARICHReconstruction.h
arich/modules/arichReconstruction/src/ARICHReconstruction.cc

Public Member Functions

Private Member Functions

Private Attributes

Static Private Attributes

Detailed Description

Member Function Documentation

◆ FastTrackingSimple()