Heavy Flavour Hadron Decays in Pythia 6.2

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• In order to improve the description of the heavy flavour hadrons decays by Pythia, the current (resp. previous) D0 prescription is (resp. was) to prevent their decay in Pythia and have them handled by EvtGen (resp. QQ) instead; provided the corresponding EvtGen (resp. QQ) user.decay file is (resp. was) given.

 

• A. Sanchez
• S. Muanza

• Currently, EvtGen only handles the 5 following B-hadrons decays:
• MDCY(134,1) = MDCY(C511,1)  = 0    ! B0
• MDCY(137,1) = MDCY(C521,1)  = 0    ! B+
• MDCY(140,1) = MDCY(C531,1)  = 0    ! BS0
• MDCY(143,1) = MDCY(C541,1)  = 0    ! BC+
• MDCY(210,1) = MDCY(C5122,1) = 0   ! Lambdab0
The notation used for the MDCY array in the first column (black) uses Pythia compressed code for particles, whereas the notation is the second column (blue) uses an equivalent (wrt to our Pythia-MC++ interface) of the Pythia full code for particles. Both notations are correct and can be used indifferently in the cardfiles package.

Links:

• Pythia 6.2 Full C-Hadrons Decay Table
• Pythia 6.2 Full B-Hadrons Decay Table

Last update:  SM  27 Jan 04