QTRUTH flags for recontructed leptons (Mcarlo only)

When reading MCarlo events, results from the QTRUTH part of QSELEP can be accessed as follows :

When doing a loop on all reconstructed charged tracks :

DO ITK=KFCHT,KLCHT

ALPHA Track ITK is a MCARLO tagged lepton with QTRUTH results if :

XLEPTH(ITK) = .TRUE.

If yes , then :

KLEPFL(ITK)

Primary quark Flavour of the event

1=d, 2=u, 3=s, 4=c, 5=b

KLEPPO(ITK)

Flavour of the quark from gluon splitting

4 or 5 if the chain is originating from a c or a b quark respectively, which are coming from gluon splitting

0 otherwise

KLEPCH(ITK)

H.F. process originating the decay chain

• -2 b $\rightarrow$ cbar u ; cbar $\rightarrow$ X
• -1 b $\rightarrow$ u X
• 1 b $\rightarrow$ c X
• 2 b $\rightarrow$ cbar c ; cbar $\rightarrow$ X
• 3 b $\rightarrow$ c $\rightarrow$ X
• 4 c $\rightarrow$ X
• 5 fragmentation or uds
KLEPSP(ITK)
End of the decay chain
• 0 lepton from H.F. hadron
• 1 K $\rightarrow$ l
• 2 pi $\rightarrow$ l
• 3 gamma $\rightarrow$ l
• 4 J/psi $\rightarrow$ l
• 5 psi' $\rightarrow$ l
• 6 pi0 $\rightarrow$ l
• 7 other $\rightarrow$ l
• 8 K
• 9 pi
• 10 other
KLEPLE(ITK)
Track identity
• -1 unidentified
• 0 non lepton
• 1 mu
• 2 tau $\rightarrow$ mu
• 3 electron
• 4 tau $\rightarrow$ e
KLEPME(ITK)
Identity of the decaying b particle (if any)
• -2 "oscillated" Bs
• -1 "oscillated" Bd
• 0 b baryon or non b particle
• 1 Bd
• 2 Bs
• 3 B+
KLEPKT(ITK)
FKIN track number of the lepton