Global geometrical track fit: Bank FRFT

If the FRF0 card is present in the ALPHA cards file, the NR=0 version of the FRFT bank (track parameters determined without vertex detector coordinates) will be used. Otherwise, the NR=2 version of FRFT (TPC + ITC + VDET tracks) will be used.

XFRF (I)

.TRUE. if track fit data are available for track I

QFRFIR (I)

Inverse radius of curvature in x-y projection Signed positive if track bends counterclockwise, negative if track bends clockwise

QFRFTL (I)

Tangent of dip angle

QFRFP0 (I)

Phi at closest approach to the z axis

QFRFD0 (I)

Distance of closest approach to z axis

QFRFZ0 (I)

z coordinate of track point where QFRFD0 is measured Note: QDB and QZB (see 8.1.4) correspond to the closest approach to the beam axis.

QFRFAL (I)

Multiple scattering angle between TPC and ITC

QFRFEM (I,N,M)

Element N,M of the error covariance matrix N,M = 1 to 6 in the order IR,TL,PH,D0,Z0,AL. Note that for data processed before April 1993 the error matrix is valid at the innermost point used in the track fit, and therefore does not include multiple scattering in material before the tracking chambers. For data processed - or reprocessed - after April 1993 the error matrix is valid at the interaction point and therefore includes the effect of multiple scattering .

QFRFC2 (I)

$\chi^{2}_{}$ of helix fit

KFRFDF (I)

Number of degrees of freedom

KFRFNO (I)

Option flag for track fit