cbm::algo::evbuild::V0Trigger Class Reference

Trigger class for secondary two-track vertices in mCBM. More...

#include <V0Trigger.h>

Public Types
typedef std::pair< std::vector< double >, V0TriggerMoniData >	Result
typedef cbm::algo::ca::Track	Track
typedef cbm::algo::ca::Vector< cbm::algo::ca::Track >	TrackVector
typedef cbm::algo::kf::TrackParamS	TrackParam

Public Member Functions
	V0Trigger ()=default
	Constructor.
Result	operator() (const TrackVector &tracks, const V0TriggerConfig &config) const
	Execution.
std::string	ToString () const
	Info to string.

Private Member Functions
std::pair< double, double >	CalcPCA (const TrackParam &track1, const TrackParam &track2) const
	Calculation of closest approach of two tracks (straight lines)
bool	Select (const Track &track, const V0TriggerConfig &config) const
	Check track cuts.
bool	IsPrimary (const TrackParam &track, const V0TriggerConfig &config) const
	Check if track is a priomary.

Detailed Description

Trigger class for secondary two-track vertices in mCBM.

Author

Volker Friese v.fri.nosp@m.ese@.nosp@m.gsi.d.nosp@m.e

Date

1 February 2024

The class takes an array of tracks and searches for track pairs close in time and with a point of closest approach (PCA) outside of the target area. Tracks are assumed to be straight lines, in the absence of a magnetic field as in mCBM. The class returns a list of trigger times corresponding to track pairs satisfying the selection criteria: Maximum time difference, minimum z of PCA, maximum distance at PCA.

Definition at line 42 of file V0Trigger.h.

Member Typedef Documentation

Result

std::pair<std::vector<double>, V0TriggerMoniData> cbm::algo::evbuild::V0Trigger::Result

Definition at line 45 of file V0Trigger.h.

Track

cbm::algo::ca::Track cbm::algo::evbuild::V0Trigger::Track

Definition at line 46 of file V0Trigger.h.

TrackParam

cbm::algo::kf::TrackParamS cbm::algo::evbuild::V0Trigger::TrackParam

Definition at line 48 of file V0Trigger.h.

TrackVector

cbm::algo::ca::Vector<cbm::algo::ca::Track> cbm::algo::evbuild::V0Trigger::TrackVector

Definition at line 47 of file V0Trigger.h.

Constructor & Destructor Documentation

V0Trigger()

cbm::algo::evbuild::V0Trigger::V0Trigger ( )

default

Constructor.

Member Function Documentation

CalcPCA()

std::pair< double, double > cbm::algo::evbuild::V0Trigger::CalcPCA ( const TrackParam & track1, const TrackParam & track2 ) const

private

Calculation of closest approach of two tracks (straight lines)

Parameters

track1	Parameters of first track
track2	Parameters of second track

Returns

(z position, distance)

The closest approach is defined at the z position where the transverse distance of the tracks (in the x-y plane) is minimal. This is not strictly the minimal distance in 3-d space, which is mathematically and computationally more involved. It should be a good criterion for the purpose of finding displaced vertices.

Definition at line 65 of file V0Trigger.cxx.

References cbm::algo::kf::TrackParamBase< T >::GetTx(), cbm::algo::kf::TrackParamBase< T >::GetTy(), cbm::algo::kf::TrackParamBase< T >::GetX(), cbm::algo::kf::TrackParamBase< T >::GetY(), cbm::algo::kf::TrackParamBase< T >::GetZ(), and sqrt().

Referenced by operator()().

IsPrimary()

bool cbm::algo::evbuild::V0Trigger::IsPrimary ( const TrackParam & track, const V0TriggerConfig & config ) const

private

Check if track is a priomary.

Parameters

track

Track parameters in target plane

Returns

decision

Definition at line 116 of file V0Trigger.cxx.

References cbm::algo::evbuild::V0TriggerConfig::TrackImpactX_max(), cbm::algo::evbuild::V0TriggerConfig::TrackImpactX_min(), cbm::algo::evbuild::V0TriggerConfig::TrackImpactY_max(), cbm::algo::evbuild::V0TriggerConfig::TrackImpactY_min(), cbm::algo::kf::TrackParamBase< T >::X(), and cbm::algo::kf::TrackParamBase< T >::Y().

Referenced by Select().

operator()()

V0Trigger::Result cbm::algo::evbuild::V0Trigger::operator()	(	const TrackVector &	tracks,
		const V0TriggerConfig &	config ) const

Execution.

Parameters

tracks	Input track vector
config	Trigger configuration

Returns

Vector of trigger times and monitoring data

Definition at line 16 of file V0Trigger.cxx.

References CalcPCA(), L_, cbm::algo::evbuild::V0TriggerConfig::PairDeltaT_max(), cbm::algo::evbuild::V0TriggerConfig::PairDist_max(), cbm::algo::evbuild::V0TriggerConfig::PairZ_max(), cbm::algo::evbuild::V0TriggerConfig::PairZ_min(), Select(), and tracks.

Select()

bool cbm::algo::evbuild::V0Trigger::Select ( const Track & track, const V0TriggerConfig & config ) const

private

Check track cuts.

Parameters

track

Track

Returns

decision

Definition at line 98 of file V0Trigger.cxx.

References cbm::algo::ca::Track::fParFirst, cbm::algo::ca::Track::fParLast, cbm::algo::ca::Track::fParPV, IsPrimary(), cbm::algo::evbuild::V0TriggerConfig::TrackEndZ_min(), cbm::algo::evbuild::V0TriggerConfig::TrackStartZ_max(), cbm::algo::evbuild::V0TriggerConfig::TrackStartZ_min(), and cbm::algo::kf::TrackParamBase< T >::Z().

Referenced by operator()().

ToString()

std::string cbm::algo::evbuild::V0Trigger::ToString

(

)

const

Info to string.

Definition at line 131 of file V0Trigger.cxx.

Referenced by cbm::algo::evbuild::EventbuildChain::Status().

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

• V0Trigger.h
• V0Trigger.cxx