Some processes are implemented to allow the introduction of anomalous coupling, in addition to the Standard Model ones. These can be switched on by ITCM(5) ; the default ITCM(5) = 0 corresponds to the Standard Model behaviour.
In processes 381 and 382, the quark substructure is included in the left-left isoscalar model [Eic84,Chi90] for ITCM(5) = 1, with compositeness scale given in RTCM(41) (default 1000 GeV) and sign of interference term in RTCM(42) (default ; only other alternative ). The above model assumes that only and quarks are composite (at least at the scale studied); with ITCM(5) = 2 compositeness terms are included in the interactions between all quarks. When ITCM(5) = 0, the two processes are equivalent with 11 and 12. A consistent set of high- jet production processes in compositeness scenarios is thus obtained by combining 381 and 382 with 13, 28, 53 and 68.
The processes 165 and 166 are basically equivalent to 1 and 2, i.e. and exchange, respectively, but with less detail (no mass-dependent width, etc.). The reason for this duplication is that the resonance treatment formalism of processes 1 and 2 could not easily be extended to include other than -channel graphs. In processes 165 and 166, only one final-state flavour is generated at the time; this flavour should be set in KFPR(165,1) and KFPR(166,1), respectively. For process 166 one gives the down-type flavour, and the program will associate the up-type flavour of the same generation. Defaults are 11 in both cases, i.e. and ( ) final states. While ITCM(5) = 0 gives the Standard Model results, ITCM(5) = 1 contains the left-left isoscalar model (which does not affect process 166), and ITCM(5) = 3 the helicity-non-conserving model (which affects both) [Eic84,Lan91]. Both models above assume that only and quarks are composite; with ITCM(5) = 2 or 4, respectively, contact terms are included for all quarks in the initial state. The relevant parameters are RTCM(41) and RTCM(42), as above.
Note that processes 165 and 166 are book-kept as processes, while 1 and 2 are ones. This means that the default scale in parton distributions is for the former and for the latter. To make contact between the two, it is recommended to set MSTP(32) = 4, so as to use as scale also for processes 165 and 166.
In process 20, for pair production, it is possible to set an anomalous magnetic moment for the in RTCM(46) ( ; where is the Standard Model value). The production process is affected according to the formulae of [Sam91], while decay currently remains unaffected. It is necessary to set ITCM(5) = 1 to enable this extension.