v0.4.2

[0.4.2] - 2024-08-20

Added

• Particles.cluster and Particles.image now copy the internal_masses values.
• Implemented new regular expression for trace of gamma five, e.g. tr5(1|2|3|4+5) is now valid. This shadows the definition of normal traces, tr, and allows for massive legs. NB: with the current implementation at least one of the four legs has to be massless (doesn't matter which one).
• Particles.internal_masses can be used to alias kinematic expressions to masses, e.g. Particles.Mh2 = 's_45' will define the squared Higgs mass as the Mandelstam 's_45'. Clustering, e.g. [4, 5] will correctly map this to 's_4'.

Changed

• Numbers in the name of masses associated with the phase space point in Particles.internal_masses must appear at the end and will be interpreted as powers (for mass dimension considerations). NB: m1 refers to the mass of the Particle at Particles[1], m2 to the second one, etc. Avoid name clashes.
• Particles.variety by default will now try the lex-groebner solver Particles._singular_variety when an hardcoded limit fails.

Fixed

• Fixed issue with Particles.variety not correctly recognizing when an hardcoded limit failed with p-adics.