SoLID-muons » DDVCS_partons

<?xml version="1.0" encoding="UTF-8" standalone="yes" ?>

<!-- Definition of scenario -->

<!-- For bookkeeping it includes date and description -->

<scenario date="2022-01-01" description="Lala">

<!-- Selection of service and its method-->

<task service="DVCSGeneratorService" method="generate">

<!-- General configuration -->

<general_configuration>

  <!-- Number of events to be generated -->

  <param name="number_of_events" value="10" />

  <!-- Subprocess. Possible values: "DVCS" (pure DVCS), "BH" (pure Bethe-Heitler), "DVCS|BH" (pure DVCS and BH), "DVCS|BH|INT" (pure DVCS, BH and interference between both) -->

  <param name="subprocess_type" value="DVCS" />

</general_configuration>

<!-- Selection of kinematic ranges -->

<kinematic_range>

  <!-- Range of $\xBj$ (Bjorken variable)-->

  <param name="range_xB" value="0.|1." />

  <!-- Range of $t$ --> 

  <param name="range_t" value="-1.|0." />

  <!-- Range of $Q^{2}$ -->

  <param name="range_Q2" value="1.|10." />

  <!-- Range of $\phi$ -->

  <param name="range_phi" value="0.|2*pi" />

  <!-- Range of $\phi_{S}$ -->

  <param name="range_phiS" value="0.|2*pi" />

  <!-- Range of $y$ -->

  <param name="range_y" value="0.01|0.95" />

</kinematic_range>

<!-- Indication of experimental conditions -->

<experimental_conditions>

  <!-- Energy of lepton beam -->

  <param name="lepton_energy" value="10.6" />

  <!-- Type of lepton beam, here electron -->

  <param name="lepton_type" value="e-" />

  <!-- Polarisation of lepton beam -->

  <param name="lepton_helicity" value="1" />

  <!-- Energy of hadron beam -->

  <!-- For target in rest frame use: value="fixed\_target" -->

  <param name="hadron_energy" value="0.938272013" />

  <!-- Type of hadron beam, here proton -->

  <param name="hadron_type" value="p" />

  <!-- Polarisation of hadron beam -->

  <!-- Possible values:  "0|0|0" for unpolarised target, "0|0|$\pm 1$" for long. polarised target, "$\pm 1$|0|0" or "0|$\pm 1$|0" for trans. polarised target -->

  <param name="hadron_polarisation" value="0.|0.|0." />

</experimental_conditions>

<!-- Configuration of ProcessModule -->

<computation_configuration>

  <!-- Selection of module -->

  <!-- DVCSProcessBMJ12 module encodes BH, DVCS and interference Born cross-sections according to Refs. \cite{Belitsky:2001ns} and \cite{Belitsky:2012ch} -->

  <module type="DVCSProcessModule" name="DVCSProcessBMJ12">

    <!-- Selection of module used for evaluation of factorisation and renormalisation scales from DVCS kinematics -->

    <!-- DVCSScalesQ2Multiplier module identifies both scales as $Q^2$ variable -->

    <module type="DVCSScalesModule" name="DVCSScalesQ2Multiplier">

    </module>

    <!-- Selection of module used for evaluation of GPD skewness variable, $\xi$, from DVCS kinematics -->

    <!-- DVCSXiConverterXBToXi module use $\xi = \xBj / (2 - \xBj)$ -->

    <module type="DVCSXiConverterModule" name="DVCSXiConverterXBToXi">

    </module>

    <!-- Selection of module used for evaluation DVCS Compton form factors (CFFs) -->

    <!-- DVCSCFFCMILOU3DTables module does not evaluate CFFs from a GPD model during EpIC run-time,  instead it uses look-up tables of CFFs evaluated beforehand with a given GPD module. A number of such look-up tables are issued with EpIC -->

    <module type="DVCSConvolCoeffFunctionModule" name="DVCSCFFCMILOU3DTables">

      <!-- pQCD order of evaluation -->

      <param name="qcd_order_type" value="LO" />

      <!-- Path to look-up table, here the one based on GK GPD model -->

      <param name="cff_set_file" value="data/DVCSCFFCMILOU3DTables/tables_GK.root" />

</module>

  </module>

</computation_configuration>

<!-- Configuration of GeneratorModule -->

<generator_configuration>

  <!-- Selection of module -->

  <!-- EventGeneratorFOAM module uses mini-FOAM library \cite{Jadach:2005ex} that is issued with ROOT \cite{Brun:1997pa} -->

  <module type="EventGeneratorModule" name="EventGeneratorFOAM">

    <!-- Parameters of FOAM algorithm -->

    <!-- Maximum number of cells -->

    <param name="nCells" value="10000" />

    <!--Number of MC events when exploring a cell -->

    <param name="nSamples" value="2000" />

    <!-- Number of bins in edge histogram for a cell -->

    <param name="nBins" value="2000" />

    <!-- State of FOAM after the initialisation will be saved in PATH/state.root. To use this file in other EpIC run, skipping the initialisation in that run, use read\_state\_file\_path option -->

    <param name="save_state_file_path" value="PATH/state.root" />

  </module>

</generator_configuration>

<!-- Configuration of KinematicModule -->

<kinematic_configuration>

  <!-- Selection of module -->

  <!-- DVCSKinematicDefault module provides default evaluation of four-momenta from DVCS kinematics -->

  <module type="DVCSKinematicModule" name="DVCSKinematicDefault">

  </module>

</kinematic_configuration>

<!-- Configuration of RCModule -->

<rc_configuration>

  <!-- Selection of module -->

  <!-- DVCSRCCollinear module provides evaluation of initial and final state radiative corrections from lepton lines using collinear approximation, see Sect. \ref{sec:rc} for more details -->

  <module type="DVCSRCModule" name="DVCSRCCollinear">

  </module>

</rc_configuration>

<!-- Configuration of WriterModule -->

<writer_configuration>

  <!-- Selection of module -->

  <!-- WriterHepMC3 module is used to save event records in HepMC3 format \cite{Buckley:2019xhk} -->

  <module type="WriterModule" name="WriterHepMC3">

    <!-- Path to output file containing event records -->

    <param name="output_file_path" value="test.txt" />

    <!-- Format of output file containing event records: "ascii" for text format, or "root" for binary ROOT format-->

    <param name="HepMC3_writer_type" value="ascii" />

  </module>

</writer_configuration>

</task>

</scenario>