Recola & Recola2

Recola releases

Recola 1.5.0 features:

  • LO and NLO helicity and color amplitudes

  • LO and NLO amplitudes squared amplitudes, optionally polarized

  • LO and NLO colour-correlated squared amplitudes for dipole subtraction

  • LO spin-correlated squared amplitudes for dipole subtraction

  • Dimreg for UV and IR singularities, optionally mass regularization (collinear)

  • Possibility for the selection of factorizable corrections in the pole approximation

  • \(\alpha_0\), \(\alpha_\mathrm{Z}\), \(G_\mathrm{F}\) schemes for the electromagnetic coupling constant \(\alpha\)

  • Fixed and running \(N_f\) flavour scheme for strong coupling constant \(\alpha_s\)

  • Complex-mass scheme for unstable particles

  • Fortran95 and C++ interfaces exemplified with demo files

Recola2 2.2.5 extends these features by:

  • Additional model files in extended Higgs-sectors

  • Complementary model files in the Background-Field Method

  • An intuitive Python interface with a built-in documentation

  • Memory optimzations for crossing related processes

  • LO and NLO spin-(colour-) correlated squared amplitudes

Release history

26/8/2025

release of recola-1.5.0:

  • new input schemes for alpha_em, including mixed schemes

  • support for polarisation of internal massive vector bosons

  • fix of bug in momentum correction (appearing for almost CMS momenta)

  • fixed treatment of Goldstone bosons in pole approximation of massive EW bosons (use transverse propagators as default!)

  • consistent use of real top mass in pole approximation for top quark

7/9/2023

release of recola-1.4.4, recola-collier-1.4.4:

  • new input method for setting alphaGF: use_gfermi_scheme_and_set_gfermi_rcl, use_gfermi_scheme_complex_and_set_gfermi_rcl

  • fix of bug in virtual QCD corrections if corresponding LO is not selected

  • fix of fermion flow

  • fix rescaling of couplings

  • other minor fixes

19/3/2022

release of recola-1.4.3, recola-collier-1.4.3:

  • bug fixes concerning polarization selection.

11/1/2022

release of recola-1.4.2, recola-collier-1.4.2:

3/8/2020

release of recola2-2.2.2, recola2-collier-2.2.2:

  • Fixed passing invariants to collier in pole approximation

  • Improved process generation in pole approximation

  • Fixed gcc10 warnings/errors

  • Optimization of use of helicity conservation

  • Updated and new model files

19/2/2019

release of recola2-2.2.0, recola2-collier-2.2.0,recola-1.4.0, recola-collier-1.4.0:

Recola1/Recola2:

  • Spin correlator a la Powheg

  • Process summary log

Recola2:

  • Global collier cache mode (see collier interface)

  • Performance boost for process generation and computation (Recola1 optimizations).

28/12/2018

release of recola2-2.1.7, recola2-collier-2.1.7:

  • Updated interface for extended Higgs sectors

  • Dynamic scales setting

  • Complete NLO correlations (spin-colour/colour/spin + loop-induced)

  • Use of crossing symmetry in process generation

  • Improved memory management for generated processes

16/01/2018

release of recola2-2.1.0, recola2-collier-2.1.0, recola-1.3.0, recola-collier-1.3.0:

  • 1-loop colour correlations

  • Selection of quark-line topologies (s,t,u channel)

  • CMake installation (make install)

  • Testing suite (make check)

  • Fix overflow bug in Recola

  • Fix segmentation fault in Recola/Recola2

19/09/2017

release of recola2-2.0.0 and recola2-collier-2.0.0:

  • Model independent version of Recola

  • Python/C++ interface

18/04/2017

release of recola-1.2 and recola-collier-1.2:

  • C++ interface

  • numerically stable computation of invariants

22/12/2016

release of recola-1.1 and recola-collier-1.1:

  • additional user methods

  • fix momenta corrections

  • fix R2 vertex \(\gamma\; \tau^-\; \tau^+\)

04/05/2016

release of recola-1.0 and recola-collier-1.0