CentralMultTask Class Reference

Inheritance diagram for CentralMultTask:

Public Types
enum	{ kValidTrigger = 0x1, kValidVertex = 0x2 }

Public Member Functions
	CentralMultTask ()
	CentralMultTask (const char *name, Double_t maxEta=2, Double_t maxVtx=10)
virtual	~CentralMultTask ()
void	SetUseTracklets (Bool_t use)
virtual void	Init ()
virtual void	UserCreateOutputObjects ()
virtual void	UserExec (Option_t *option)
virtual void	Terminate (Option_t *option)

Protected Member Functions
UShort_t	CheckEvent (const AliESDEvent &esd, Double_t &vz)

Protected Attributes
TH2D *	fHist
TH1D *	fAll
TH1D *	fGlobal
TH1D *	fITS
TH1D *	fTracklets
TH1D *	fNEventsTr
TH1D *	fNEventsVtx
TList *	fOutput
AliESDtrackCuts	fQGlo
AliESDtrackCuts	fQITS
AliESDtrackCuts	fDCAwSPD
AliESDtrackCuts	fDCAwoSPD
AliESDtrackCuts	fIsPrimary
Bool_t	fUseTracklets
Bool_t	fDebug

Detailed Description

Task to determine the charged particle pseudo density from tracks and tracklets.

This class determines

\[ \left.\frac{d^2N_{ch}}{d\eta d\phi}\right|_{central} \]

from tracks and tracklets.

First, global tracks are investigated. The requirements on global tracks are

• \( n_{TPC clusters} \ge 70\)
• \( \chi^2_{TPC cluster} \le 4\)
• No daughter kinks
• Re-fit of TPC tracks
• Re-fit of ITS tracks
• No requirement on SPD clusters

Secondly, ITS stand-alone tracks are investigated. The requirements on ITS standalone tracks are

• Re-fit of ITS tracks
• No requirement on SPD clusters

Tracks that does not meet these quality conditions are flagged as rejected.

Both kinds of tracks (global and ITS standalone) have requirements on the distance of closest approach (DCA) to the interaction vertex \((v_x,v_y,v_z)\).

For tracks with SPD clusters:

• \( DCA_{xy} < 0.0182+0.0350/p_t^{1.01}\)
• \( DCA_{z} < 0.5\)

For tracks without SPD clusters

• \( DCA_{xy} < 1.5(0.0182+0.0350/p_t^{1.01})\)
• \( DCA_{z} < 0.5\)

Tracks that does not meet these DCA requirements are flagged as secondaries.

Thirdly, the number of SPD tracklets are investigated. If the tracklet is associated with a track, and that track has already been used, then that tracklet is ignored

An \((\eta,\phi)\) per-event histogram is then filled from these tracks and tracklets, and that histogram is stored in the output AOD event.

Furthermore, a number of diagnostics \(\eta\) histograms are filled:

• \(\eta\) of all accepted tracks and tracklets
• \(\eta\) of accepted global tracks
• \(\eta\) of accepted ITS tracks
• \(\eta\) of accepted SPD tracklets

At the end of the job, these histograms are normalized to the number of accepted events and bin width to provide an estimate of the \(dN_{ch}/d\eta\)

Only minimum bias events with a \(v_z\) within the defined cut are analysed.

Deprecated:

This class is deprecated

Definition at line 84 of file AddTaskCentralTracks.C.

Member Enumeration Documentation

anonymous enum

Enumerator
kValidTrigger
kValidVertex

Definition at line 87 of file AddTaskCentralTracks.C.

Constructor & Destructor Documentation

CentralMultTask::CentralMultTask ( )

inline

Constructor

Definition at line 187 of file AddTaskCentralTracks.C.

Referenced by AddTaskCentralTracks().

CentralMultTask::CentralMultTask ( const char *  name, Double_t  maxEta = 2, Double_t  maxVtx = 10  )

inline

Constructor

Parameters

name	Name of task
maxEta	Set \(\eta\) range
maxVtx	Set \(v_z\) range

Definition at line 202 of file AddTaskCentralTracks.C.

CentralMultTask::~CentralMultTask ( )

inlinevirtual

Destructor

Definition at line 331 of file AddTaskCentralTracks.C.

Member Function Documentation

UShort_t CentralMultTask::CheckEvent ( const AliESDEvent &  esd, Double_t &  vz  )

inlineprotected

Check if this event is within cuts

Parameters

esd	Event
vz	Vertex \( z\) coordinate

Returns

true if this event is to be considered

Definition at line 371 of file AddTaskCentralTracks.C.

Referenced by Init(), and UserExec().

virtual void CentralMultTask::Init ( )

inlinevirtual

Initialise on master - does nothing

Definition at line 121 of file AddTaskCentralTracks.C.

void CentralMultTask::SetUseTracklets ( Bool_t  use )

inline

Whether to use tracklets

Parameters

use	IF true, use tracklets

Definition at line 116 of file AddTaskCentralTracks.C.

void CentralMultTask::Terminate ( Option_t *  option )

inlinevirtual

Called at end of event processing.

This is called once in the master

Parameters

option

Not used

Definition at line 559 of file AddTaskCentralTracks.C.

Referenced by Init().

void CentralMultTask::UserCreateOutputObjects ( )

inlinevirtual

Create output objects.

This is called once per slave process

Definition at line 342 of file AddTaskCentralTracks.C.

Referenced by Init().

void CentralMultTask::UserExec ( Option_t *  option )

inlinevirtual

Process a single event

Parameters

option

Not used

Definition at line 436 of file AddTaskCentralTracks.C.

Referenced by Init().

Member Data Documentation

TH1D* CentralMultTask::fAll

protected

Definition at line 154 of file AddTaskCentralTracks.C.

Referenced by CentralMultTask(), UserCreateOutputObjects(), UserExec(), and ~CentralMultTask().

AliESDtrackCuts CentralMultTask::fDCAwoSPD

protected

Definition at line 164 of file AddTaskCentralTracks.C.

Referenced by CentralMultTask(), and UserExec().

AliESDtrackCuts CentralMultTask::fDCAwSPD

protected

Definition at line 163 of file AddTaskCentralTracks.C.

Referenced by CentralMultTask(), and UserExec().

Bool_t CentralMultTask::fDebug

protected

Definition at line 167 of file AddTaskCentralTracks.C.

Referenced by CheckEvent(), and UserExec().

TH1D* CentralMultTask::fGlobal

protected

Definition at line 155 of file AddTaskCentralTracks.C.

Referenced by CentralMultTask(), UserCreateOutputObjects(), UserExec(), and ~CentralMultTask().

TH2D* CentralMultTask::fHist

protected

Definition at line 153 of file AddTaskCentralTracks.C.

Referenced by CentralMultTask(), UserCreateOutputObjects(), UserExec(), and ~CentralMultTask().

AliESDtrackCuts CentralMultTask::fIsPrimary

protected

Definition at line 165 of file AddTaskCentralTracks.C.

Referenced by CentralMultTask().

TH1D* CentralMultTask::fITS

protected

Definition at line 156 of file AddTaskCentralTracks.C.

Referenced by CentralMultTask(), UserCreateOutputObjects(), UserExec(), and ~CentralMultTask().

TH1D* CentralMultTask::fNEventsTr

protected

Definition at line 158 of file AddTaskCentralTracks.C.

Referenced by CentralMultTask(), UserCreateOutputObjects(), and UserExec().

TH1D* CentralMultTask::fNEventsVtx

protected

Definition at line 159 of file AddTaskCentralTracks.C.

Referenced by CentralMultTask(), CheckEvent(), UserCreateOutputObjects(), and UserExec().

TList* CentralMultTask::fOutput

protected

Definition at line 160 of file AddTaskCentralTracks.C.

Referenced by Terminate(), UserCreateOutputObjects(), and UserExec().

AliESDtrackCuts CentralMultTask::fQGlo

protected

Definition at line 161 of file AddTaskCentralTracks.C.

Referenced by CentralMultTask(), and UserExec().

AliESDtrackCuts CentralMultTask::fQITS

protected

Definition at line 162 of file AddTaskCentralTracks.C.

Referenced by CentralMultTask(), and UserExec().

TH1D* CentralMultTask::fTracklets

protected

Definition at line 157 of file AddTaskCentralTracks.C.

Referenced by CentralMultTask(), UserCreateOutputObjects(), UserExec(), and ~CentralMultTask().

Bool_t CentralMultTask::fUseTracklets

protected

Definition at line 166 of file AddTaskCentralTracks.C.

Referenced by SetUseTracklets(), Terminate(), and UserExec().

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

• PWGLF/FORWARD/analysis2/AddTaskCentralTracks.C