Calling the QIPBTAG routine

Input argument: none

Output arguments:

IRET

• = 0 good event , analysis performed
• = 1 Number of jets less than 2
• = 2 Jets outside solid angle cuts
• = -2 No beam spot information
• = 3,4 No tracks suitable for btag analysis
• = -3 Error in interaction point finding
NTRK
Number of tracks used to calculate the probabilities (maximum 400)
NJET
Number of jets found (maximum 40)
ITRK
Array (dim 40) of ALPHA track numbers of the NJET jets found, sorted by energy
IFRF2
Array (dim 400) of row numbers in FRFT 2 of the NTRK tracks used in the analysis
PRTRK
Array (dim 400) of the probabilities of each track used in the analysis
PRJET
Array (dim 40) of the probabilities of each jet of ITRK
PRHEMI
Array (dim 2) of the probabilities of each hemisphere
PREVT
Probability of the event

All the above arrays must be properly dimensioned in the calling routine.

Additional QIPBTAG informations are available in the ALPHA include file BTAGRAW, which may be found in $ALROOT/alphavsn/inc/btagraw.h