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EpIC is a modern and versatile Monte Carlo generator used in studying exclusive processes. These processes are sensitive to generalised parton distributions (GPDs), which describe the 3D partonic structure of hadrons in the language of quantum chromodynamics (QCD). EpIC has been developed to support the current and future experimental programmes, likeelectron-ion collider (EIC) to be constructed in Brookhaven National Laboratory.

EpIC is based onPARTONS framework, which provides the basic elements of its architecture. PARTONS is also used to evaluate Born cross-sections, which together with radiative corrections implemented in EpIC, are used to generate unweighted Monte Carlo events.

Exclusive processes currently available in EpIC are:

• deeply virtual Compton scattering (DVCS)
• time-like Compton scattering (TCS)
• deeply virtual meson production (DVMP), only π⁰ case
• double deeply virtual Compton scattering (DDVCS)
• diphoton photoproduction (work in progress)

We refer toPARTONS documentation of modules for information on theory developments (like GPD models) available for the evaluation of Born cross-sections.

Seethis page for user's guide. More technical information, which is important for a better understanding of the architecture of EpIC,e.g. for the purpose of further developments, can be found inthis article. The article also provides the official reference to be used in publications. Docker image with the up-to-date version of EpIC can be foundhere.