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@MISC{Rodini:606497,
      author       = {Rodini, Simone and Vladimirov, Aelxey and Rossi, Lorenzo},
      title        = {honeycomb; a program for evolution of twist-3 parton
                      distribution functions},
      reportid     = {PUBDB-2024-01600},
      year         = {2024},
      note         = {License: GNU GPL v2.0 DOI:
                      https://zenodo.org/doi/10.5281/zenodo.11102676Note: The
                      software is released with the work: DESY-24-060},
      abstract     = {**Nature of the problem:**The aim is to develop a code that
                      allows for the evaluation of the evolution equations for the
                      twist-3 parton distributions at LO in the strong coupling
                      with a variable number of flavors. Standard techniques that
                      have been developed for the twist-2 case cannot be
                      straightforwardly applied because of the increased
                      dimensionality of the problem. The balance between
                      performance, memory requirements and accuracy becomes even
                      more important and difficult to achieve. **Solution method**
                      1) The choice of coordinates. We parametrize the plane
                      defined by momentum conservation $x_1+x_2+x_3=0$ using
                      radial-angular coordinates in the infinite norm (rather than
                      the Euclidean norm), since it respects the symmetries of the
                      problem. 2) We discretize the radial and angular
                      coordinates. Different grids are provided, the radial grids
                      especially are chosen to have a high density near the
                      origin. 3) The parton distributions are linearly
                      interpolated in grid space. 4) The coupled
                      integro-differential evolution equations are transformed
                      into a system of coupled differential equations and are
                      solved using the 4th-order Runge-Kutta method.},
      cin          = {T},
      cid          = {I:(DE-H253)T-20120731},
      pnm          = {611 - Fundamental Particles and Forces (POF4-611) / DFG
                      project 409651613 - FOR 2926: Next Generation Perturbative
                      QCD for Hadron Structure: Preparing for the Electron-Ion
                      Collider (409651613) / DFG project 430915355 - Multi-Parton
                      Wechselwirkungen und Beiträge mit höherem Twist
                      (430915355)},
      pid          = {G:(DE-HGF)POF4-611 / G:(GEPRIS)409651613 /
                      G:(GEPRIS)430915355},
      experiment   = {EXP:(DE-MLZ)NOSPEC-20140101},
      typ          = {PUB:(DE-HGF)33},
      url          = {https://bib-pubdb1.desy.de/record/606497},
}