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<h1 class="title">Event Class Reference</h1>
<p>The class holds the complete event record<a href="#details">.
More...</a></p>
<pre><span class="preprocessor"> #include</span> "Event.h"</pre>
<hr>
<h2>Public Member Functions</h2>
<table class="alignedsummary" border="0" cellpadding="0" cellspacing="0" width="100%">
<tbody><tr>
<td class="memItemLeft" align="right" valign="top">void</td>
<td class="memItemRight" valign="bottom"><a href="#list">list</a>(ostream
&amp;os = cout) const</td></tr>
</tbody></table>
<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">unsigned long</td>
<td class="memItemRight" valign="bottom"><a href="#eventNumber">eventNumber</a></td></tr>
<tr>
<td class="memItemLeft" align="right" valign="top">double</td>
<td class="memItemRight" valign="bottom"><a href="#Q2">Q2</a></td></tr>
<tr>
<td class="memItemLeft" align="right" valign="top">double</td>
<td class="memItemRight" valign="top"><a href="#W">W</a></td></tr>
<tr>
<td class="memItemLeft" align="right" valign="top">double</td>
<td class="memItemRight" valign="top"><a href="#t">t</a></td></tr>
<tr>
<td class="memItemLeft" align="right" valign="top">double</td>
<td class="memItemRight" valign="top"><a href="#s">s</a></td></tr>
<tr>
<td class="memItemLeft" align="right" valign="top">double</td>
<td class="memItemRight" valign="top"><a href="#y">y</a></td></tr>
<tr>
<td class="memItemLeft" align="right" valign="top">double</td>
<td class="memItemRight" valign="top"><a href="#xpom">xpom</a></td></tr>
<tr>
<td class="memItemLeft" align="right" valign="top">double</td>
<td class="memItemRight" valign="top"><a href="#beta">beta</a></td></tr>
<tr>
<td class="memItemLeft" align="right" valign="top">GammaPolarization</td>
<td class="memItemRight" valign="top"><a href="#polarization">polarization</a></td></tr>
<tr>
<td class="memItemLeft" align="right" valign="top">DiffractiveMode</td>
<td class="memItemRight" valign="top"><a href="#diffractiveMode">diffractiveMode</a></td></tr>
<tr>
<td class="memItemLeft" align="right" valign="top">vector&lt;<a href="refParticle.html">Particles</a>&gt;</td>
<td class="memItemRight" valign="top"><a href="#particles">particles</a></td></tr>
</tbody></table>
<hr>
<h2><a name="details" id="details"></a>Detailed Description</h2>
<p>The <code>Event</code> class holds the event record. The complete
event record (in the form of a pointer to an instance of <code>Event</code>)
is obtained via <a href="refSartre.html#generateEvent">Sartre::generateEvent()</a>. It is a lightweight
class with only one member function and all
data member are public. The class holds information about general
event characteristics (Q<sup>2</sup>, W, t, x, etc) as well as a
vector holding all particles involved in the event. Note that the
instance of the current event is deleted when the next event is generated.
In case you want to keep a certain event in your application you
need to keep a copy. </p>
<p>Note that in the incoherent case (with nuclear breakup on) Sar<em>t</em>re
does not conserve momentum/energy.
The reason is that the generator that takes care of the nuclear breakup
(gemini++) does not generate photons but only baryons.
The event record is thus not 100% complete. This might be fixed in
future versions of Sar<em>t</em>re.</p>
<p><a href="refEvent.html#list">Event::list()</a> prints the complete
event record with the most useful information. A typical print-out
(here e+Au) of two events, one coherent, the other incoherent, looks
like this:<a name="listexample" id="listexample"></a>
<pre class="code">
evt = 48 Q2 = 0.005 x = 2.096e-06
W = 51.145 y = 0.327
t = -0.034 xpom = 3.683e-03
pol = T diff = coherent
# id name status parents daughters px py pz E m
0 11 e- 4 - - 2 3 0.000 0.000 -20.000 20.000 5.110e-04
1 1000791970 Au(197) 4 - - 6 - 0.000 0.000 99.996 100.000 0.938
2 11 e- 1 0 - - - 0.047 -0.039 -13.463 13.463 5.110e-04
3 22 gamma 2 0 - 4 5 -0.047 0.039 -6.537 6.537 -0.074
4 443 J/psi 1 3 - - - -0.213 -0.043 -6.169 6.906 3.097
5 990 pomeron 2 3 3 6 - 0.166 0.081 -0.369 -0.369 -0.186
6 1000791970 Au(197) 1 1 5 - - 0.166 0.081 99.627 99.631 0.938
evt = 49 Q2 = 0.111 x = 7.746e-05
W = 37.784 y = 0.178
t = -0.059 xpom = 6.841e-03
pol = T diff = incoherent
# id name status parents daughters px py pz E m
0 11 e- 4 - - 2 3 0.000 0.000 -20.000 20.000 5.110e-04
1 1000791970 Au(197) 4 - - 6 - 0.000 0.000 99.996 100.000 0.938
2 11 e- 1 0 - - - -0.029 -0.300 -16.431 16.434 5.110e-04
3 22 gamma 2 0 - 4 5 0.029 0.300 -3.569 3.566 -0.332
4 443 J/psi 1 3 - - - 0.170 0.497 -2.876 4.259 3.097
5 990 pomeron 2 3 3 6 - -0.141 -0.197 -0.693 -0.693 -0.243
6 1000791970 Au(197) 2 1 5 - - -0.141 -0.197 99.303 99.307 0.940
7 2112 neutron 1 6 - - - -0.279 -0.156 108.304 108.309 0.940
8 1000010020 H(2) 1 6 - - - -0.086 -0.228 86.940 86.945 0.932
9 2112 neutron 1 6 - - - -0.186 -0.140 107.826 107.830 0.940
10 2112 neutron 1 6 - - - -0.237 -0.170 108.517 108.522 0.940
11 1000030080 Li(8) 1 6 - - - -0.057 -0.203 96.457 96.461 0.932
12 1000010020 H(2) 1 6 - - - -0.093 -0.129 86.289 86.294 0.932
13 1000020040 He(4) 1 6 - - - -0.219 -0.241 105.637 105.642 0.932
14 2112 neutron 1 6 - - - -0.106 -0.207 109.252 109.256 0.940
15 2112 neutron 1 6 - - - -0.092 -0.192 99.491 99.496 0.940
16 1000010030 H(3) 1 6 - - - -0.094 -0.280 98.482 98.487 0.932
17 1000010030 H(3) 1 6 - - - -0.142 -0.143 90.911 90.916 0.932
18 2112 neutron 1 6 - - - -0.224 -0.210 93.493 93.498 0.940
19 2112 neutron 1 6 - - - -0.204 -0.266 106.528 106.533 0.940
20 2112 neutron 1 6 - - - -0.076 -0.182 91.921 91.926 0.940
21 2112 neutron 1 6 - - - -0.102 -0.250 105.395 105.400 0.940
22 2112 neutron 1 6 - - - -0.208 -0.178 106.315 106.319 0.940
23 1000010020 H(2) 1 6 - - - -0.232 -0.144 99.072 99.077 0.932
24 2112 neutron 1 6 - - - -0.038 -0.219 97.387 97.392 0.940
25 2112 neutron 1 6 - - - -0.170 -0.263 103.741 103.745 0.940
26 1000020040 He(4) 1 6 - - - -0.091 -0.200 90.720 90.725 0.932
27 2112 neutron 1 6 - - - -0.192 -0.132 93.762 93.767 0.940
28 2112 neutron 1 6 - - - -0.183 -0.213 97.401 97.406 0.940
29 2112 neutron 1 6 - - - -0.183 -0.190 96.888 96.893 0.940
30 2112 neutron 1 6 - - - -0.098 -0.231 106.143 106.147 0.940
31 2112 neutron 1 6 - - - -0.171 -0.207 97.729 97.734 0.940
32 1000671520 Ho(152) 1 6 - - - -0.142 -0.193 98.776 98.780 0.932
</pre>
Note that the products of the nuclear breakup in the incoherent case are only
listed when activated through the runcard (<code>enableNuclearBreakup = true</code>)
or programmatically (<a href="refEventGeneratorSettings.html#setEnableNuclearBreakup">EventGeneratorSettings::setEnableNuclearBreakup</a>(true))
.
It is off by default.
Momenta and energies for nuclei are always given as per nucleon.
<hr>
<h2> Member Function Documentation</h2>
<h3 class="fn"><a name="list" id="list"></a>void list(ostream
&amp;<var>os</var> = cout) const</h3>
<p>Prints the current event record to output stream <var>os</var> (default
= <code>cout</code>). It is often useful to print few events of each run to see if everything
is set correctly or for debugging purposes. See the examples <a href="#listexample">above</a>.</p>
<p>&nbsp;</p>
<h2>Data Member Documentation</h2>
<h3 class="fn"><a name="eventNumber" id="eventNumber"></a>unsigned long eventNumber</h3>
<p>Number of the current event. Event numbering starts at 0. </p>
<h3 class="fn"><a name="Q2" id="Q2"></a>double Q2</h3>
<p>Q<sup>2</sup> of the current event in GeV<sup>2</sup>. </p>
<h3 class="fn"><a name="W" id="W"></a>double W</h3>
<p>W of the current event in GeV<sup>2</sup>. </p>
<h3 class="fn"><a name="t" id="t"></a>double t</h3>
<p>t of the current event in GeV<sup>2</sup>.</p>
<h3 class="fn"><a name="x" id="x"></a>double x</h3>
<p>Bjorken x of the current event. </p>
<h3 class="fn"><a name="s" id="s"></a>double s</h3>
<p>Center-of-mass energy of the current event in GeV<sup>2</sup>. This
is the same for all events in a run and is just recorded for convenience.
</p>
<h3 class="fn"><a name="y" id="y"></a>double y</h3>
<p>Inelasticity, y, of the current event.</p>
<h3 class="fn"><a name="xpom" id="xpom"></a>double xpom</h3>
<p>x<sub>pomeron</sub> of the current event. </p>
<h3 class="fn"><a name="beta" id="beta"></a>double beta</h3>
<p>&beta; of the current event. Can always be calculated via x/xpom
but is recorded for convenience.</p>
<h3 class="fn"><a name="polarization" id="polarization"></a><a href="refEnumerations.html">GammaPolarization</a> polarization</h3>
<p>Polarization of the virtual photon.</p>
<h3 class="fn"><a name="diffractiveMode" id="diffractiveMode"></a><a href="refEnumerations.html">DiffractiveMode</a> diffractiveMode</h3>
<p>Records if the event is coherent or incoherent.</p>
<h3 class="fn"><a name="particles" id="particles"></a>vector&lt;<a href="refParticle.html">Particle</a>&gt; particles</h3>
<p>All particles stable or decayed in the current event. See the
class <a href="refParticle.html">Particle</a> reference for details.</p>
<p>&nbsp;</p>
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