I have been looking at our favorite "min-bias" run, 2336. I will recheck the suggested offset later today. However, when I asked Hiro about this last week, he seemed to confirm seeing the same thing. Hiro, could please recheck your analysis and post whether and how much of an offset you see. ...steve > From: Yury Blyakhman <Yury_B@physics.nyu.edu> > Reply-To: brahms-dev-l@bnl.gov > Date: Mon, 16 Apr 2001 09:22:29 -0400 > To: brahms-dev-l@bnl.gov > Subject: Re: BB vertex offset > > Hello, everybody. > > I don't know about any vertex shift. The correction constant, which is > implemented in the BB calibration routine alligns BB vertex and the TPM1 > vertex. And this constant is the same for different runs, I checked it > for 10 runs with a lot of statistics. > > "Stephen J. Sanders" wrote: >> >> Hi, I have been working on reconciling the new mult code with the old. >> I was able to track down >> one significant difference in the two calculations to the approx. 2 cm >> difference found between the >> BB and TPM1 vertices. In the "old" analysis, I had explicitly worked >> this into the vertex I >> (illegally) passed to the BrRdoModuleMult class. However, >> putting such an artificial offset into the BrSiRdoMult and BrTileRdoTile >> classes (both of which need >> the vertex) is likely to cause consternation in the future. >> >> Is there a reason why this offset is not incorporated in the vertex >> returned by the BrRdoBB module? >> >> For the moment, I have updated the mult modules to incorporate the >> vertex offset. There are still >> differences between the si and tile energies reported by the "old" and >> "new" code for which I have >> not yet been able to identify causes. >> >> ...steve > > -- > Yury Blyakhman. > > ======================================================== > New York University Phone: (212)998-7762 > Department of Physics Fax: (212)995-4016 > 4 Washington Place Mobile: (646)528-7187 > New York, N.Y. 10003 mailto:Yury_B@physics.nyu.edu > ======================================================== >
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