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User name tajima
Log entry time 20:22:09 on March 25, 2006
Entry number 168357
This entry is a followup to: 168355
keyword=Proton cointime resolution (updated)
this is a follow up to my previous entry.
This time, i used all N1 bars and all BBscin bars to make proton coin time
plots to get more statistics. However, I needed to modify the cointime
(given in my previous entry) manualy so that the cointime peak from each
of the N1 bar is aligned. What i plotted is: "cointime" +
na.nd.n1.hit_xpos[0]*3.9 because the cointime peak depends linearly on
the N1 bar vertical position. Attached plot shows the FWHM is about 2.5ns.
I applied additional cuts on electron momentum, "abs(pcalc-pex)<0.05",
and also applied the coplanarity cuts and electron momentum>1.0.
Figure 1
Pcointime3040_N1_BGscin_allbars.ps