SCET Workshop 2022

Session

NGL and Glauber

20 Apr 2022, 09:00

University of Bern

32. Resummation of Super-Leading Logarithms

Matthias Neubert

20/04/2022, 09:00

Jet cross sections at high-energy colliders exhibit intricate patterns of logarithmically enhanced higher-order corrections. In particular, so-called nonglobal logarithms emerge from soft radiation emitted off energetic partons inside jets. While this is a single-logarithmic effect at lepton colliders, at hadron colliders phase factors in the amplitudes lead to double-logarithmic corrections...

20. Glauber Resummation

Michel Stillger (JGU Mainz)

20/04/2022, 09:30

The higher-order behavior of logarithmically enhanced contributions in non-global observables is very intricate, in particular as double-logarithmic corrections may arise first at very high orders in perturbation theory. Recently, the resummation of these super-leading logarithms (SLLs) to all orders for generic $2\rightarrow l$ scattering processes at hardron colliders has been achieved [1]....

37. Two-loop anomalous dimension for the resummation of non-global observables

Xu Xiaofeng

20/04/2022, 10:00

The soft radiation emitted in jet cross sections can resolve the directions and colors of individual hard partons, leading to a complicated pattern of logarithmically enhanced terms in the perturbative series. Starting from a factorization theorem and solving the renormalization group equations for its ingredients, these large logarithms can be resummed. We extract the two-loop anomalous...

15. Next-to-leading non-global 
logarithms from jet calculus

Pier Francesco Monni (CERN)

20/04/2022, 11:00

We present a formalism for the resummation of non-global QCD observables beyond leading logarithmic accuracy. We discuss the derivation of a set of integro-differential equations that governs the dynamics of soft radiation in the planar limit, using which we perform a calculation of the out-of-jet transverse energy distributions at lepton colliders. We finally comment on the solution of the...

36. A NNLL Evolution Equation for Regge Amplitudes

Sanjay Raman

20/04/2022, 11:30

The exchange of Glauber particles in SCET can be used to study QCD scattering amplitudes in the Regge limit. At NNLL level, the RGE for Regge 2-to-2 scattering amplitudes are not currently known. In this talk, I will use the tools of SCET to study the RGE structure of the three-loop Glauber exchange amplitude, which specifies these terms. SCET consistency relations between the soft and...

22. An EFT derivation of the saturation scale (remote)

Varun Vaidya

20/04/2022, 12:00

I will talk about an EFT formulation for understanding the physics of saturation in Deep Inelastic scattering using the Glauber EFT for forward scattering. I ll show how to derive a factorization formula that manifestly decouples the physics of the probe, the Quark-antiQuark Dipole, from the universal physics of the medium, namely a hadron or a large nucleus, by treating the probe as an Open...