FCC precision requests: challenges for Monte Carlos and phenomenology tools

Abstract

One can define three levels of ambiguities for the accelerator experiments: worse than 0.3%, around 0.3% and better than 0.3%. I will address issues important, for the last case, when Monte Carlo programs that simultaneously account for theoretical and experimental effects are necessary. To complete efforts, simultaneous effort in many specialities over years was necessary. The monumental projects of Bryan Lynn, Robin Stuart, Dima Bardin, Wolfgang Hollik and contributions of S. Jadach in the domain of precision physics need to be mentioned, they provide theoretical foundations. Incomplete lists of methodology domains and projects, usually left into references, appendices, and private notes include: (i) Phase space--> symmetries (ii) matrix element preparation --> factorizations (iii) program and development process design (iv) testing strategies (v) user interaction (vi) software tools (vii) partners and competitors. Usually we were publishing our own projects, let me mention incomplete lists of methodology domains and projects, which were usually left aside into references, appendices, and private notes: The work started on the basis of previous efforts which can be listed following names of the programs: (i) FOWL, (ii) GENRAP, (iii) Mustraal, (iv) Koralb, (v) Lesko, (vi) Tauola, (vii) KoralZ, (viii) Lumlog, (ix) Oldbab, (x) Bhlumi, (xi) Bhwide and (xii) KKMC. I will focus on some of these points. Others, hopefully, are covered in other talks. In particular I do not need to cover exponentiation and some issues of factorization; see contributions to the proceedings by B.F.L. Ward and A. Tapadar. Developments took years and did not follow a straight line; that is why there are simplifications, biases. Also a review of literature could not be completed.

8 pages