Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2005-06-13
Comput.Phys.Commun.177:738-756,2007
Physics
High Energy Physics
High Energy Physics - Phenomenology
28 pages, 15 figures, 8 tables. To be published in Comput.Phys.Commun
Scientific paper
10.1016/j.cpc.2007.06.006
In this paper we describe the implementation of processes f_1 bar-f_1 ZZ --> 0 and f_1 bar-f_1 HZ --> 0 into the framework of SANC system. The f_1 stands for a massless fermion f whose mass is kept non-zero only in arguments of ln functions and --> 0 means that all 4-momenta flow inwards. The derived scalar form factors can be used for any cross channel after an appropriate permutation of their arguments (s,t,u). We present the covariant and helicity amplitudes for these processes: for the former only in the annihilation channel f_1 bar-f_1 --> ZZ, while for the latter in annihilation f_1 bar-f_1 --> HZ and decay H --> Z f_1 bar-f_1 channels. We briefly describe additional precomputation modules which were not covered in the previous paper. For the processes f_1 bar-f_1 --> HZ(ZZ) and decay H --> Z f_1 bar-f_1 we present compact results of calculation of the accompanying bremsstrahlung and discuss exhaustive numerical results. As applications there are two types of the Monte Carlo generators for the process H --> 4\mu. The first one is the generator based on a single resonance approximation for one of the Z bosons. The second one, exploiting the double resonance approximation, is not described in this article. For the generator in the single approximation we present a short description. Whenever possible, we compare our results with those existing in the literature. For example, we present a comparison of the results for H --> 4 \mu decay with those obtained by MC generator Prophecy4f.
Bardin Dima
Bondarenko Sergey
Kalinovskaya Lida
Nanava G.
Rumyantsev L.
No associations
LandOfFree
SANCnews: Sector ffbb does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with SANCnews: Sector ffbb, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and SANCnews: Sector ffbb will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-649506