Hello, everybody. Ian, thanks for noticing the bug, I'll fix it. As for the timing question, in general I'm working now on improving it in general and creating smth. like a quality factor to go with t0. In other words, when ever you ask BBRdoModule for t0, it'll tell yo how good it is at the same time. But this is well in future because of many other things on the to-do-NOW!!! list... The simplest solution I can suggest would be to individually modify BBRdo Module. As of now it determines t0 using all of the tubes, but it uses different mechanism for Small and Big tubes. One'll just have to comment out lines about Small tubes, starting with smth like: if(l<37)... and if(r<31) l and r are indices for Left and Right and Small numbers are: l=1...36 and r=1...30. As of now, if it can't extract time from any of the tubes using "good" method, it uses the "fastest tubes". It's resolution is also of the order of 4cm and "fastest" mechanism is used roughly in 5-10% of the events. So, if one wants to use Big tubes only, one'd have to comment this part as well. As for dN/dEta, Flemming answered it already. i'm looking into ALL possible reasons... Thanks, "I. G. Bearden" wrote: > > Dear Dev-iants, > I have been looking a little at the BBRdoModule to try to figure out how > to use > only the Big tubes to produce T0, since these apparently have the best > resolution. > Yury, I think you have done this before, how? > Also, is it reasonable to have two T0s in the rdo data object, say one > from the > whole BB array and one from only the Big Tubes? > I think I also found a bug in the code.... > in the loop over the "left" side of the array, the following line > appears: > rdodata->SetLeftHits(NumLeft); > and in the loop over the "right" side, the following appears: > rdodata->SetLeftHits(NumRight); > I guess this is not right. I think that I have the latest version, but > if not, sorry > for the false alarm. > > I have one other question related to the Beam-Beam results from Yury's > last note. > The multiplicity appears to be higher on the right side (i.e. positive > eta), is this > due to scattering from D1? If so, how much--if at all--do the results > change with the > angle of the FS? > Cheers, > > -- > Ian-------------------------------------------------------------------- > | I.G. Bearden | > | Niels Bohr Institute Tb 3 email: bearden@nbi.dk | > | Blegdamsvej 17 phone: (+45) 35 32 53 23 | > | København Ø FAX: (+45) 31 42 10 16 | > | Danmark | > ---------------------------------------------------------------------- -- Yury Blyakhman. \\\|/// \\ - - // ( @ @ ) +------------------------o00o-(_)-o00o-------------+ | New York University Phone: (212)998-7762 | | Department of Physics Fax: (212) 995-4016 | | 4 Washington Place E-mail: | | New York, N.Y. 10003 Yury_B@physics.nyu.edu | | Mobile : (646)528-7187 | | Home phone: (718)934-1851 ICQ# 2330402 | +--------------------------------0ooo--------------+ ooo0 ( ) ( ) ) / \ ( (_/ \_)
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