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StRoot
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StRoot
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#include <StHelix.hh>
Public Member Functions | |
| StHelix (double c, double dip, double phase, const StThreeVector< double > &o, int h=-1) | |
| curvature, dip angle, phase, origin, h | |
| double | dipAngle () const |
| double | curvature () const |
| double | phase () const |
| 1/R in xy-plane | |
| double | xcenter () const |
| aziumth in xy-plane measured from ring center | |
| double | ycenter () const |
| x-center of circle in xy-plane | |
| int | h () const |
| y-center of circle in xy-plane | |
| const StThreeVector< double > & | origin () const |
| -sign(q*B); | |
| void | setParameters (double c, double dip, double phase, const StThreeVector< double > &o, int h) |
| starting point | |
| double | x (double s) const |
| coordinates of helix at point s | |
| double | y (double s) const |
| double | z (double s) const |
| StThreeVector< double > | at (double s) const |
| double | cx (double s) const |
| pointing vector of helix at point s | |
| double | cy (double s) const |
| double | cz (double s=0) const |
| StThreeVector< double > | cat (double s) const |
| double | period () const |
| returns period length of helix | |
| pair< double, double > | pathLength (double r) const |
| path length at given r (cylindrical r) | |
| pair< double, double > | pathLength (double r, double x, double y) |
| path length at given r (cylindrical r, cylinder axis at x,y) | |
| double | pathLength (const StThreeVector< double > &p, bool scanPeriods=true) const |
| path length at distance of closest approach to a given point | |
| double | pathLength (const StThreeVector< double > &r, const StThreeVector< double > &n) const |
| path length at intersection with plane | |
| double | pathLength (double x, double y) const |
| path length at distance of closest approach in the xy-plane to a given point | |
| pair< double, double > | pathLengths (const StHelix &, double minStepSize=10 *micrometer, double minRange=10 *centimeter) const |
| path lengths at dca between two helices | |
| double | distance (const StThreeVector< double > &p, bool scanPeriods=true) const |
| minimal distance between point and helix | |
| bool | valid (double world=1.e+5) const |
| checks for valid parametrization | |
| int | bad (double world=1.e+5) const |
| virtual void | moveOrigin (double s) |
| move the origin along the helix to s which becomes then s=0 | |
Static Public Attributes | |
| static const double | NoSolution = 3.e+33 |
Protected Member Functions | |
| void | setCurvature (double) |
| void | setPhase (double) |
| performs also various checks | |
| void | setDipAngle (double) |
| double | fudgePathLength (const StThreeVector< double > &) const |
| value of S where distance in x-y plane is minimal | |
Protected Attributes | |
| bool | mSingularity |
| StThreeVector< double > | mOrigin |
| double | mDipAngle |
| double | mCurvature |
| double | mPhase |
| int | mH |
| double | mCosDipAngle |
| double | mSinDipAngle |
| double | mCosPhase |
| double | mSinPhase |
Parametrization of a helix. Can also cope with straight tracks, i.e. with zero curvature. This represents only the mathematical model of a helix. See the SCL user guide for more.
Definition at line 65 of file StHelix.hh.
1.8.5