Hi Christian, > > On Thu, 12 Apr 2001 22:15:57 -0500 > "Stephen J. Sanders" <ssanders@ukans.edu> wrote > concerning ": BB vertex offset": >> Hi, >> one significant difference in the two calculations to the approx. 2 cm >> difference found between the BB and TPM1 vertices. > > Bjorn, Yury, do you know why there's this difference? > > Steve, can we be absolutely sure that the BB vertex is "off" by 2 cm.? No, but this offset is strongly suggested by tracking the single mip peak in individual elements of the Si array as a function of vertex position and, talking to Hiro, the offset is needed to obtain a symmetric dN/deta distribution for the Si array. At this point, I think a shift of the BB vertex is the most likely culprit. > > > Uh. Steve (and others) please don't use fabs, sin, cos, tan, and other > functions from cmath. Use TMath/BrMath instead. TMath is there to > insure portabliblity (various compilers have different ideas of > ANSI/ISO standard C - yes I know, stupid - ROOT doesn't). OK, I was wondering why you didn't like to use the standard C/C++ routines.
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