Changeset a07b54c in git
- Timestamp:
- Apr 14, 2020, 7:45:19 PM (5 years ago)
- Branches:
- master
- Children:
- 974f5bc
- Parents:
- 09ffaee
- git-author:
- Roberto Preghenella <preghenella@…> (04/05/20 19:17:47)
- git-committer:
- Roberto Preghenella <preghenella@…> (04/14/20 19:45:19)
- File:
-
- 1 edited
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- Added
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modules/ParticlePropagator.cc
r09ffaee ra07b54c 135 135 Double_t l, d0, dz, p, ctgTheta, phip, etap, alpha; 136 136 Double_t bsx, bsy, bsz; 137 137 Double_t s0, s1, sd; 138 138 139 const Double_t c_light = 2.99792458E8; 139 140 … … 297 298 zd = z + (TMath::Sqrt(xd * xd + yd * yd) - TMath::Sqrt(x * x + y * y)) * pz / pt; 298 299 300 // proper calculation of the DCAz coordinate 301 // s0: track circle parameter at the track origin 302 // s1: track circle parameter at the closest approach to beam pipe 303 // sd: s1-s0 signed angular difference 304 s0 = atan2(y - y_c, x - x_c); 305 s1 = atan2(yd - y_c, xd - x_c); 306 sd = atan2(sin(s1 - s0), cos(s1 - s0)); 307 zd = z - r * pz / pt * sd; 308 299 309 // use perigee momentum rather than original particle 300 310 // momentum, since the orignal particle momentum isn't known
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