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<!--
//==============================================================================
// refParticle.html
//
// Copyright (C) 2010-2013 Tobias Toll and Thomas Ullrich
//
// This file is part of Sartre version: 1.1
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation.
// This program is distributed in the hope that it will be useful,
// but without any warranty; without even the implied warranty of
// merchantability or fitness for a particular purpose. See the
// GNU General Public License for more details.
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
//
// Author: Thomas Ullrich
// Last update:
//
$Date: 2013-05-29 21:25:21 +0100 (Wed, 29 May 2013) $
//
$Author: thomas.ullrich@bnl.gov $
//==============================================================================
-->
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<
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>
Sartre - Particle Class Reference
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Overview
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Reference Guide
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</
table
>
<
h1
class
=
"title"
>
Particle Class Reference
</
h1
>
<
p
>
The Particle class holds information of any particle used in Sartre
<
a
href
=
"#details"
>
.
More...
</
a
></
p
>
<
pre
><
span
class
=
"preprocessor"
>
#include
</
span
>
"Event.h"
</
pre
>
<
hr
>
<
h2
>
Public Data Member
</
h2
>
<
table
class
=
"alignedsummary"
border
=
"0"
cellpadding
=
"0"
cellspacing
=
"0"
width
=
"100%"
>
<
tbody
><
tr
><
td
class
=
"memItemLeft"
align
=
"right"
valign
=
"top"
>
int
</
td
>
<
td
class
=
"memItemRight"
valign
=
"bottom"
><
a
href
=
"#index"
>
index
</
a
></
td
></
tr
>
<
tr
>
<
td
class
=
"memItemLeft"
align
=
"right"
valign
=
"top"
>
int
</
td
>
<
td
class
=
"memItemRight"
valign
=
"bottom"
><
a
href
=
"#pdgId"
>
pdgId
</
a
></
td
></
tr
>
<
tr
>
<
td
class
=
"memItemLeft"
align
=
"right"
valign
=
"top"
>
int
</
td
>
<
td
class
=
"memItemRight"
valign
=
"top"
><
a
href
=
"#status"
>
status
</
a
></
td
></
tr
>
<
tr
>
<
td
class
=
"memItemLeft"
align
=
"right"
valign
=
"top"
>
TLorentzVector
</
td
>
<
td
class
=
"memItemRight"
valign
=
"top"
><
a
href
=
"#p"
>
p
</
a
></
td
></
tr
>
<
tr
>
<
td
class
=
"memItemLeft"
align
=
"right"
valign
=
"top"
>
vector
<
int
>
</
td
>
<
td
class
=
"memItemRight"
valign
=
"top"
><
a
href
=
"#parents"
>
parents
</
a
></
td
></
tr
>
<
tr
>
<
td
class
=
"memItemLeft"
align
=
"right"
valign
=
"top"
>
vector
<
int
>
</
td
>
<
td
class
=
"memItemRight"
valign
=
"top"
><
a
href
=
"#daughters"
>
daughters
</
a
></
td
></
tr
>
</
tbody
></
table
>
<
hr
>
<
h2
><
a
name
=
"details"
id
=
"details"
></
a
>
Detailed Description
</
h2
>
<
p
>
The Particle class contains all information needed to
describe any particle used in Sar
<
em
>
t
</
em
>
e.
The particles are stored in an internal list in the
<
a
href
=
"refEvent.html"
>
Event
</
a
>
class.
It is a lightweight class without any member functions and all data members
are public. The data members hold information on the particle's status
(stable/decayed), 4-momentum, parent particle(s), daughter particle(s).
Each particle is uniquely identified by an index number.
</
p
>
<
p
>
Note that moment and energy (TLorentzVector p) for nuclei are always
expressed
as
<
em
>
per-nucleon
</
em
>
.
</
p
>
<
hr
>
<
h2
>
Data Member Documentation
</
h2
>
<
h3
class
=
"fn"
><
a
name
=
"index"
id
=
"index"
></
a
>
int index
</
h3
>
<
p
>
Index of the particle. The index starts at 0. index=0 is typically
the incoming electron and index=1 the incoming hadron. The index
identifies a particle unambiguously in the event.
</
p
>
<
h3
class
=
"fn"
><
a
name
=
"pdgId"
id
=
"pdgId"
></
a
>
int pdgId
</
h3
>
<
p
>
The ID of the particle following the PDG scheme. Note that it also
holds nuclei and heavy fragments. The PDG for nuclei is coded
as 10LZZZAAAI, where L = number of strange quark (for hypernuclei),
I = isomer level, with I = 0 corresponding to the ground state and
I
>
0 to excitations. For example
the Au ion is decoded as
<
span
class
=
"code"
>
1000791970
</
span
>
.
</
p
>
<
h3
class
=
"fn"
><
a
name
=
"status"
id
=
"status"
></
a
>
int status
<
span
class
=
"memItemRight"
></
span
></
h3
>
<
p
>
We follow HepMC conventions (February 2009).
<
br
/>
0 : an empty entry, with no meaningful information (not used in Sar
<
em
>
t
</
em
>
re)
<
br
/>
1 : a final-state particle, i.e. a particle that is not decayed further by the
generator (may also include unstable particles that are to be decayed later)
<
br
/>
2 : a decayed hadron or tau or mu lepton, or an intermediate virtual particle.
<
br
/>
3 : a documentation entry (not used in Sar
<
em
>
t
</
em
>
re)
<
br
/>
4 : an incoming beam particle;
<
br
/>
11 - 200 : an intermediate (decayed/branched/...) particle that does
not fulfill the criteria of status code 2 (not used in Sar
<
em
>
t
</
em
>
re)
<
br
/>
At the moment Sartre only supports status codes 1,2, and 4.
</
p
>
<
h3
class
=
"fn"
><
a
name
=
"p"
id
=
"p"
></
a
>
TLorentzVector p
<
span
class
=
"memItemRight"
></
span
></
h3
>
<
p
>
Four momentum vector of the particle. See
<
a
href
=
"http://root.cern.ch/root/html/TLorentzVector.html"
>
ROOT
documentation
</
a
>
for details. The vector is defined with respect to
the beam axis. The beam electron comes from the right, with a negative
p
<
sub
>
z
</
sub
>
, the hadron beam is coming from the left and has a
positive p
<
sub
>
z
</
sub
>
. Note that momenta and energy (TLorentzVector
p) for nuclei are always expressed
as
<
em
>
per-nucleon
</
em
>
.
</
p
>
<
h3
class
=
"fn"
><
a
name
=
"parents"
id
=
"parents"
></
a
>
vector
<
int
>
parents
<
span
class
=
"memItemRight"
></
span
></
h3
>
<
p
>
Vector holding the
<
a
href
=
"#index"
>
index
</
a
>
of each parent. In Sar
<
em
>
t
</
em
>
re there are currently
at most 2 parents.
</
p
>
<
h3
class
=
"fn"
><
a
name
=
"daughters"
id
=
"daughters"
></
a
>
vector
<
int
>
daughters
<
span
class
=
"memItemRight"
></
span
></
h3
>
<
p
>
Vector holding the
<
a
href
=
"#index"
>
index
</
a
>
of the daughter(s) of
the particle.
</
p
>
<
address
><
div
align
=
"center"
>
<
table
border
=
"0"
cellspacing
=
"0"
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><
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class
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>
<
td
align
=
"left"
width
=
"40%"
>
</
td
>
<
td
align
=
"center"
width
=
"20%"
>
</
td
>
<
td
align
=
"right"
width
=
"40%"
><
div
align
=
"right"
><
br
>
Last Update:
<!-- #BeginDate format:Am1 -->
January 8, 2013
<!-- #EndDate -->
</
div
></
td
>
</
tr
></
tbody
></
table
></
div
></
address
>
</
body
></
html
>
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