SuperCHIC: Monte Carlo Event Generator for Central Exclusive Production
The enclosed standalone Fortran code provides public access to the Monte Carlo generator described in:L.A. Harland-Lang, V.A. Khoze, M.G. Ryskin, W.J. Stirling
"Central exclusive chi_c meson production at the Tevatron revisited"
"Standard candle central exclusive processes at the Tevatron and LHC"
"Central exclusive quarkonium production with tagged forward protons at RHIC"
"Central exclusive meson pair production in the perturbative regime at hadron colliders"
"Central exclusive production as a probe of the gluonic component of the eta' and eta mesons"
Please reference the relevant papers if you use the programme for a publication.
The program currently generates unweighted events for central exclusive J/ψ, Υ, γγ, χqJ, ηq and meson pair (ππ, ηη, η'η', ηη', ρρ) production, with q=(b,c) and J=(0,1,2).
The decay of χcJ states is generated via the transition
χc → J/ψ γ → μ+ μ- γ
and χbJ via
χb → ϒ γ → μ+ μ- γ
Alternatively, χqJ and ηq decays can be generated via the two body transition
X → h1 + h2
with h(1,2) scalar or fermionic states of mass mh. χc0 four-body decays are also included
X → h1 + h2 + h3 + h4
Photon induced exclusive J/ψ, ψ(2S) and Υ production is generated via the leptonic decay
V → l+l-For the ψ(2S) the three-body decay
ψ(2S) → J/ψ π+π-is also included, currently done only according to phase space. ππ and ηη generated via the two-photon decay
π(η) → γγ
Note meson pair and γγ CEP only generated for MX> 2 GeV. Processes can be generated at cms energies of √s = 1.96, 7, 8, 10 and 14 TeV and χcJ, ηc production can also be generated at √s= 500 GeV. Meson pair CEP can also be generated at √s= 0.3 and 0.9 TeV.Comments to Lucian Harland-Lang < lucian.harland-lang (at) durham.ac.uk >.