28 July 2020 to 6 August 2020
virtual conference
Europe/Prague timezone

Soft-gluon effective coupling

28 Jul 2020, 19:10
15m
virtual conference

virtual conference

Talk 06. Strong Interactions and Hadron Physics Strong Interactions and Hadron Physics

Speaker

Daniel Enrique De Florian Sabaris (International Center for Advanced Studies (AR))

Description

We consider the extension of the CMW soft-gluon effective coupling in the context of soft-gluon resummation for QCD hard-scattering observables beyond the next-to-leading logarithmic accuracy. We present two proposals of a soft-gluon effective coupling that extend the CMW coupling to all perturbative orders. Although both effective couplings are well-defined in the physical four-dimensional space time, we examine their behaviour in 𝑑=4−2\ep space time dimensions. We uncover an all-order perturbative relation with the cusp anomalous dimension: the (four dimensional) cusp anomalous dimension is equal to the 𝑑-dimensional soft-gluon effective coupling at the conformal point \ep=𝛽(\as). We present the explicit expressions of the two soft-gluon couplings up to O(\as^2).
In the four-dimensional case we compute the two soft couplings up to O(\as^3).

Primary author

Daniel Enrique De Florian Sabaris (International Center for Advanced Studies (AR))

Presentation Materials