Talk

• Ntuple-based monitoring for L3 online: Michiel Sanders.
  Michiel discussed the work he has been doing to enable reco_analyze to be run online as an "examine" and how this might be applied to running l3fanalyze in a similar way. The basic idea would be for the roottuple produced by l3fanalyze to be read in a continuously updating fashion by a root macro that fills histograms defined by the L3 group. Currently xgooey would be used to view these histograms. Michiel has agreed to make the necessary modifications to l3fanalyze and each tool author should provide definitions for a few histograms to go into the root macro. It seems like a good idea for us to run d0_analyze with reco_analyze and the L1/L2 analyze packages switched off initially. (Once we get something running then the L1/L2 analyze packages could be switched on and L1/L2 monitoring could be easily available via this route.)
  Note added Thursday 2nd May: Yann Coadou and Michiel sat down in front of a terminal and figured out exactly what changes Michiel needs to make and where to get this all to work.

Discussion Items

• Getting L3 tracking into the trigger list.
  Daniel Whiteson and Terry Wyatt sat down with Elizabeth today and made global_CalMuon6.10. On each of the four single muon triggers at L1/L2 this has a script with 100% mark&pass fraction and a standalone track filter requiring at least one L3 global track with p_t > 3.0 GeV. N.B. Each single muon triggers at L1/L2 also has a script with 100% mark&pass fraction and a loose muon filter. Daniel and Robert will run some tests and then let everyone where to get hold of the appropriate level3.sim files. The hope is to get L3 muon and tracking running online early next week.
• Need for greater rejection at L3.
  With luminosity now at around 1.6 * 10**31 at the beginning of the fill, several triggers have acquired L1 prescales because the rate to tape is too high. This is clearly inefficient and undesirable. In particular, some of our favorite electron triggers CEM(1,10) and CEM(2,5) have prescales of 2 at 1.6 * 10**31. We should definitely tighten the shower shape cuts to those we proposed originally. Volker and Ulla will measure the additional rejection that could be obtained by increasing the p_t cuts for the two electron filters (with and without shower shape cuts) that we currently have hanging off of CEM(1,10) and CEM(2,5). Another possibility to sharpen the turn on curve is to make use of primary vertex information....
• .... Next steps for track-based primary vertex tool.
  It would be good to see the results of the primary vertex tool if the cut on the number of stereo hits were reduced from 8 to, say, 3, in order to pick up the tracks that have stereo information only in SMT. In addition, results on the most recent possible data, which has fully instrumented CFT stereo, would be interesting.
• Inconsistencies between on and offline results for tau tool: Yann Coadou.
  Yann finds slight differences in the properties of taus found online and when running the simulator offline. In rare cases this causes the number of candidate taus to be different on and offline. Offline, he gets exactly identical results when he runs on d0mino and clued0. Next step seems to be to use Gustaaf's technique of running in "online" mode on an offline machine.
• Problems with event_info: Yann Coadou.
  Yann has found that when running on real data event_info delivers the online trigger results even when the simulator is run!
  Solution 1: event_info needs a switch to tell it whether to deliver the online or simulator results.
  Prefered Solution: Both event_info and l3fanalyze should provide both online and simulator results to enable event-by-event comparisons using one roottuple.
• We urgently need someone to make the information on tool timing collected by the L3 monitor program visible in the control room.

Scribe: Terry Wyatt.