MMC and UCR icetray modules Dima Chirkin, LBNL Presented by Spencer Klein Tau 2-bang Coincident showers

MMC (Muon Monte Carlo) consists of icetray modules mmc and mmc-icetray mmc contains the full java sources of the stand- alone mmc package; cam be compiled by make or ammc –ca (compile all). The executable archive mmc.jar needs to be present in the lib directory and can be replaced with mmc executable compiled elsewhere (e.g., from the mmc homepage: mmc-icetray contains jni-based interface to mmc, and is largely just an interface to icetray icetray-c2j needs to be compiled as well java must be present and match the version of the jni libs used to compile mmc-icetray

MMC: All Lepton Monte Carlo MMC propagates: muons taus electrons monopoles neutrinos of all types MMC can be used with an external generator such as corsika++ or ucr with an internal generator

MMC as generator Gaisser’s formula is implemented for muons with corrections: Volkova’s large zenith angle energy loss in the air decay in flight Volkova’s formulae are implemented for muon and electron neutrinos with correction: Volkova’s large zenith angle E -  spectrum can be specified for all charged leptons and neutrinos default parameters for atmospheric fluxes are from fits to corsika, can be adjusted through the options parameter

Nutrino generation Earth density profile as: Monopoles can be propagated (shown are m-s of 3 energies tau double bang events can be generated (as in the 1 st slide) Earth neutrino oscillations can be taken into account

UCR (Ubiquitous CORSIKA Reader) formerly UC reader (i.e., developed at the UC Berkeley) Is CORSIKA really necessary then? yes, since the simple phenomenological generator in MMC can only generate single particle per shower, i.e., no muon bundles Why not use corsika++? corsika++ is intended for IceTop and its muons will in many cases miss the in-ice detector completely corsika++ does not take into account important effect of the Earth surface curvature need features, missing in corsika++: random primary generator multiple showers per event

UCR datafiles Why use the f2k dcorsika files and not files in native (binary) CORSIKA format? dcorsika f2k files are extremely compact, when compared to the native CORSIKA files. For atmospheric muon showers with primary threshold of 600 GeV and muon of 273 GeV, file sizes are: for dcorsika f2k.gz format for native CORSIKA format dcorsika files can be produced with dcorsika distibution from (based on CORSIKA 6.204). Should this be made part of the tools?

ucr-icetray ucr-icetray is a simple adaptation of ucr to icetray. It makes a system call to the executable ucr-icetray-ucr and will fail if the executable is not there (compiled when running make together with the ucr-icetray module) A pipe file is created in the /tmp directory and deleting it while the program is executing will stop it. This is done to preserve all of functionality of the ucr: multiple files can be read, oversampled, events can be combined. The core randomization is done at this stage. If the dcorsika files contain neutrinos, they will be created and possibly combined with other valid events.

Example script mmc-icetray/resources/RunSimulation.C is the example script for both mmc-icetray and ucr-icetray. mmc_mode: 1.propagate muons or taus only (one or the other, initializes faster and is smaller at run time). Electron and monopole propagation is possible only in this mode 2.use as phenomenological event generator (atmospheric or E -  spectrum charged leptons and/or neutrinos) 3.propagate all leptons (all charged leptons and neutrinos) gen_mode (only used with mmc_mode=1 or 3) 1.use corsika++ 2.use ucr-icetray

Conclusions use ucr-icetray to read dcorsika muon and/or neutrino files, dcorsika is based on CORSIKA mmc can be used for both muon propagation and charged lepton propagation neutrino propagation atmospheric and E -  charged lepton generation atmospheric and E -  neutrino generation monopole propagation