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Fourth-generation fermions

MSEL = 7, 8, 37, 38
ISUB =
1 $\mathrm{f}_i \overline{\mathrm{f}}_i \to \gamma^* / \mathrm{Z}^0$
2 $\mathrm{f}_i \overline{\mathrm{f}}_j \to \mathrm{W}^+$
81 $\mathrm{q}_i \overline{\mathrm{q}}_i \to \mathrm{Q}_k \overline{\mathrm{Q}}_k$
82 $\mathrm{g}\mathrm{g}\to \mathrm{Q}_k \overline{\mathrm{Q}}_k$
83 $\mathrm{q}_i \mathrm{f}_j \to \mathrm{Q}_k \mathrm{f}_l$
84 $\mathrm{g}\gamma \to \mathrm{Q}_k \overline{\mathrm{Q}}_k$
85 $\gamma \gamma \to \mathrm{F}_k \overline{\mathrm{F}}_k$
141 $\mathrm{f}_i \overline{\mathrm{f}}_i \to \gamma/\mathrm{Z}^0/\mathrm{Z}'^0$
142 $\mathrm{f}_i \overline{\mathrm{f}}_j \to \mathrm{W}'^+$

While the existence of a fourth generation currently seems unlikely, the appropriate flavour content is still found in the program. In fact, the fourth generation is included on an equal basis with the first three, provided MSTP(1) = 4. Also processes other than the ones above can therefore be used, e.g. all other processes with gauge bosons, including non-standard ones such as the $\mathrm{Z}'^0$. We therefore do not repeat the descriptions found elsewhere, such as how to set only the desired flavour in processes 81-85. Note that it may be convenient to set CKIN(1) and other cuts such that the mass of produced gauge bosons is enough for the wanted particle production -- in principle the program will cope even without that, but possibly at the expense of very slow execution.


next up previous contents
Next: New gauge bosons Up: Non-Standard Physics Previous: Non-Standard Physics   Contents
Stephen Mrenna 2007-10-30