Hi JH, Thanks for the quick reply. You say that you compare the BB vertex distributions - but by doing this I guess you bias the data sample towards more "central" events, or? I mean, the p+p events that give BB vertex are probably not missed by the INEL trigger to begin with. Claus On Wed, 11 Feb 2004, J.H. Lee wrote: > Hi, Claus, > > > these (28%) missing events? How do we evaluate the Ntr in the > > missed events. If we just calculate the yields by dividing > > Nev by the trigger efficiency (i.e. multiply the spectrum by > > 0.72) we somehow assume that the missing events don't have > > any tracks. Is that fair? > > Yes, it's fair. > This shouldn't be an issue since the spec. triggers include > inelastic trigger(trigger5). If you are interested in trigger > bias from including INEL in spec triggers, see the attached > message. > > JH > > ----------------------------------------------------- > ----- Original Message ----- > From: "J.H. Lee" <jhlee@bnl.gov> > To: "Flemming Videbaek" <videbaek@bnl.gov> > Cc: "Chellis Chasman" <chasman@bnl.gov>; <beavis@bnl.gov>; <debbe@bnl.gov> > Sent: Friday, May 02, 2003 5:41 PM > Subject: Trigger3 with and without INEL > > > > Hi, Flemming, > > > > I've looked at the special run you took today, run 8767, > > with trigger3 = Hodo+R.C. I compared the BB vertex distribution for > > trigger3 in the run with the one from run 8768 taken right after the > > run with the normal spec trigger condition (trigger3 = Hodo + INEL). I > > normalized the two distributions with the number of accumulated > > ZDC(Y+B) counts in the scaler. I assumed dead time is similar for the > > two runs. It looks like there seems to be no obvious bias from INEL > > in Trigger3 by looking at the distributions. The INEL in the spec trigger > > simply cut out tracks outside of the range. Looks pretty good to me. > > > > JH > > > > _______________________________________________ Brahms-l mailing list Brahms-l@lists.bnl.gov http://lists.bnl.gov/mailman/listinfo/brahms-lReceived on Thu Feb 12 03:08:13 2004
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