n
pair. In the former category <i>p p</i> and <i>pbar p</i> 
combinations dominate, but it is also possible to combine with 
<i>pi^+</i>, <i>pi^-</i> and <i>pi^0</i>. In the latter 
<i>e^+ e^-</i> and <i>mu^+ mu^-</i> would be the most useful 
combinations, but also others should work if combined with an 
appropriate hard process.

<p/><code>mode&nbsp; </code><strong> Beams:idA &nbsp;</strong> 
 (<code>default = <strong>2212</strong></code>)<br/>
The PDG <code>id</code> code for the first incoming particle.