TofNucleiZCut Class Reference

The TofNuclei charge cut. More...

#include <TofNucleiZCut.h>

Inheritance diagram for TofNucleiZCut:

List of all members.

Public Member Functions
	TofNucleiZCut (const char *cutName, unsigned int Z, float lowerLimit, float upperLimit, unsigned int minLayers=6, unsigned int layersMask=0)
	Constructor.
	~TofNucleiZCut ()
	Destructor.
int	Check (PamLevel2 *event)
	The TofNucleiZ check.

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Detailed Description

The TofNuclei charge cut.

This cut uses the TofNuclei library to cut events depending on particle's charge value.

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Constructor & Destructor Documentation

TofNucleiZCut::TofNucleiZCut	(	const char *	cutName,
		unsigned int	Z,
		float	lowerLimit,
		float	upperLimit,
		unsigned int	minLayers = 6,
		unsigned int	layersMask = 0
	)

Constructor.

The charge to look for is passed to the TofNucleiZCut object as Z. For each charge, there is an associated distribution of events, with mean Zmean and standard deviation sigmaZ. These values will be used to check the events.

Parameters:

	cutName	The cut's name.
	Z	The charge value.
	lowerLimit	The lower bound (in units of sigmaZ) of the desired charge range, defined as Zmean - lowerBound*sigmaZ.
	upperLimit	The upper bound (in units of sigmaZ) of the desired charge range, defined as Zmean + upperBound*sigmaZ.
	minLayers	The minimum number of layers for which Z must have been measured.
	layersMask	The masked layers (see TofNucleiZ_Layers). These will be ignored throughout all the TofNucleiZCut analysis.

See also:

Check

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Member Function Documentation

int TofNucleiZCut::Check

(

PamLevel2 *

event

)

[virtual]

The TofNucleiZ check.

The routine selects events whose value of Zmean obtained from the ToF is in the range [Zmean - sigma*lowerBound, Zmean + sigma*upperBound]. Zmean and sigma are defined respectively as the mean and the standard deviation of the charge distributions obtained using ToFNuclei. The calibration values used in this routine (for all energies) are:

Z=1 | Zmean sigma ------------------------ S11 | 0.987 0.11 S12 | 0.988 0.12 S21 | 0.961 0.083 S22 | 0.966 0.10 S31 | 0.981 0.092 S32 | 0.979 0.095

Z=2 | Zmean sigma ------------------------ S11 | 1.96 0.12 S12 | 1.95 0.14 S21 | 1.95 0.13 S22 | 1.96 0.14 S31 | 1.99 0.14 S32 | 2.00 0.15

In current implementation, heavier nuclei up to oxygen are partially calibrated; means are taken equal to the particle's charge (Zmean = Z) and a single sigma is used for all ToF layers:

Z | sigma ----------- 3 | 0.20 4 | 0.25 5 | 0.32 6 | 0.40 7 | 0.45 8 | 0.50

The charge of the particle is detrmined by calling ToFNuclei::Get_Charge_ToF_std_layer(). First of all, the number of non-masked layers giving a valid charge information is checked to be greater than minLayers; then the bound on the charge value is checked for all valid planes. If at least one of the valid, non-masked planes gives a charge outside the bounds the routine will return TOFNUCLEIZ_OUTOFBOUNDS. Note that this happens even if more than minLayers give a charge inside boundaries; for example, if minLayers = 5 and we have 6 good charge measurement of which only 5 are inside the boundaries, the check will fail. Notice that masking a layer has the net effect of reducing the number of layers: asking minLayers = 5 and masking two planes will result in return value of TOFNUCLEIZ_TOOFEWLAYERS for all events, since the "effective ToF" has only 4 layers.

Parameters:

event

The event to analyze.

Returns:

CUTOK if the charge obtained from TofNuclei is in the range [Z - sigma*lowerBound, Z + sigma*upperBound] in at least minLayers (apart from eventual masked layers).

TOFNUCLEIZ_OUTOFBOUNDS if charge is out of bounds in at least one non-masked layer.

TOFNUCLEIZ_TOOFEWLAYERS if charge information is available for a number of layers lesser than minLayers.

TRKNUCLEIZ_OUTOFBOUNDS if Z < 1 or Z > 8.

Implements PamCut.

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

• TofCuts/TofNucleiZCut/TofNucleiZCut.h
• TofCuts/TofNucleiZCut/TofNucleiZCut.cpp