Name: HEP phenomenology joint Cavendish-DAMTP seminar
Start: 2020-11-26T16:00:00+00:00
End: 2020-11-26T18:00:00+00:00
Location: Virtual

HEP phenomenology joint Cavendish-DAMTP seminar

Thursday, November 26, 2020 - 4:00 PM

Monday, November 23, 2020
Tuesday, November 24, 2020
Wednesday, November 25, 2020
Thursday, November 26, 2020
4:00 PM Local Unitarity: a representation of differential cross-sections that is locally free of infrared singularities at any order - Ben Ruijl (ETH Zurich)
Local Unitarity: a representation of differential cross-sections that is locally free of infrared singularities at any order
- Ben Ruijl (ETH Zurich)
4:00 PM - 5:00 PM
One of the major challenges in computing higher-order corrections of collider observables is the treatment of infrared singularities. Local Unitarity is a novel representation of differential scattering cross-sections that locally realises the direct cancellation of infrared singularities exhibited by its so-called real-emission and virtual degrees of freedom. We take advantage of the Loop-Tree Duality representation of each individual forward-scattering diagram and we prove that the ensuing expression is locally free of infrared divergences, applies at any perturbative order and for any process without initial-state collinear singularities. Our representation is especially suited for a numerical implementation and we demonstrate its practical potential by computing fully numerically and without any IR counterterm the next-to-leading order accurate differential cross-section for the process e+ e− -> d d. We also show first results beyond next-to-leading order by computing interference terms part of the N4LO-accurate inclusive cross-section of a 1 -> 2 + X scalar scattering process.

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