People interested (add your name): Francesco Riva, Ken Mimasu, Benjamin Fuks, Julia Harz

Investigate the impact of higher order corrections or additional radiation on high energy 2→2 processes involving dimension 6 EFT operators that have been shown not to interfere at leading order.

A simple test case may be $W^+ W^-$ production at a lepton collider. Here the EW corrections including dimension 6 operators have not been calculated but an extra photon (or any extra vector) emission would alter the helicity structure and is part of the higher order contribution.

References:

• “Helicity selection rules and noninterference for BSM amplitudes” (arXiv)
• Rivet tool implementing stage 1 and 0 selections maintained by LHCHXSWG (link)