GLB, STA, trig rates, firsts ... troubleshooting

Problem:

• STA: 1/5events, GLB:1/.... --> many STA fakes (?) --> dirrect implication on the trigger rates (xxx), higher than acceptable

Investigation

• look at number of valid, bad,lost hits for STA muons, from DT, CSC, RPC separately, vs pT, eta.
• verify the same info versus the trigger firing

Results

• staLastHitDetId_v2.pdf:
  • many bad STA, on which we most certainly trigger
  • last hit position is on second CSC station--expected for punch-through.
  • --> increase trigger rate with fake/bad muons;

Now what?

• change the trigger, to fire when having 3 stations hits (as opposed to 2); L2 trigger.

-- CameliaMironov - 09-Nov-2010

• validHIts vs layer in all STA:
  

• pt<10GeV, sta all:
  

• all sta, pt vs eta: