Triggering and Event Samples

  The FPD will be used to study the physics topics discussed in Section 2. Examples of the trigger terms for the primary physics topics that require dedicated triggers are given in Table 7. These terms are described in detail below:

• ``Track'' refers to a track required with a certain momentum fraction. For the hard diffraction trigger the track can be in any spectrometer, for the double pomeron triggers both p and tracks are required.
• ``Halo Veto'' refers to the veto on early hits in the diagonal opposite spectrometer
• ``LØ Single Interaction'' is the requirement that the Level Ø counters yield a timing consistent with a single event hypothesis.
• ``Tower'' refers to a trigger tower which is in .
• ``LØ Veto'' demands that there are no hits in either side of LØ\ (rapidity gap requirement).
• ``Single Interaction Tool'' is a Level 3 routine that uses the full detector information to reject multiple interactions as discussed in the previous section.
• ``X'' refers to some level of activity in the detector, such as a central fiber track, some number of hits in the silicon vertex detector, etc.

In addition to these triggers, prescaled elastic and single diffractive triggers will be taken to monitor the FPD performance.

  
Table 7: Details of primary dedicated triggers.

 
• Trigger Rates
• Data Samples