LoopFest XXI

Session

Session 1

26 Jun 2023, 09:00

Kavli Auditorium (SLAC National Accelerator Laboratory)

Conveners

Session 1: Morning Session 1

• LANCE Dixon

Session 1: Morning Session 3

• George Sterman (Stony Brook University)

Session 1: Morning Session 5

• Alexander Karlberg (CERN)

51. Welcome

Bernhard Mistlberger (SLAC National Accelerator Laboratory (US))

26/06/2023, 09:00

33. Di-Higgs Searches at the LHC

Caterina Vernieri (SLAC National Accelerator Laboratory (US))

26/06/2023, 09:05

41. Uncertainties in SMEFT Predictions: The Role of Flavor

Sally Dawson, Sally Dawson (BNL), Sally Dawson (BNL)

26/06/2023, 09:40

39. Exploring the impact of AFB on SMEFT fits with high invariant-mass Drell-Yan data

Yingsheng Huang (Northwestern University & Argonne National Laboratory)

26/06/2023, 10:05

31. Azimuthal asymmetries in Drell-Yan and semi-inclusive DIS beyond leading order

Anjie Gao

26/06/2023, 10:30

Since shortly after the discovery of partons, people have thought about probing their transverse momentum inside hadrons. For example, in 1978 it was shown to give rise to an azimuthal cos(phi) asymmetry of the outgoing hadrons in the process of semi-inclusive DIS (SIDIS), known as the Cahn effect. The cos(phi) distribution, as well as a number of other asymmetries in both SIDIS and Drell-Yan,...

34. Machine Learning and the LHC

Ben Nachman (Lawrence Berkeley National Lab. (US))

27/06/2023, 09:00

38. IR-safe flavoured jet algorithms for the precision era

Fabrizio Arturo Caola (University of Oxford (GB))

27/06/2023, 09:35

35. MW determination at hadron colliders: QCD uncertainties

Alessandro Vicini (University of Milano), Alessandro Vicini (Università degli Studi e INFN Milano (IT))

27/06/2023, 10:00

47. Two excursions in four dimensions

George Sterman (Stony Brook University)

28/06/2023, 09:00

14. A gauge choice for IR singularities

Prof. Davison Soper (University of Oregon)

28/06/2023, 09:25

For constructing the subtraction terms for the calculation of infrared safe observables or for constructing the splitting functions for a parton shower beyond leading order, one needs to understand the infrared behavior of loop diagrams. For this purpose, the choice of gauge matters. I will describe the interpolating gauge of Doust (1987) and Baulieu and Zwanziger (1999). This gauge...

27. Numerical integration of multi-loop integrals in momentum space using threshold subtraction

Dario Kermanschah

28/06/2023, 09:50

I will present a technique that enables the direct numerical integration of finite multi-loop integrals in momentum space without the need for contour deformation.
After first analytically integrating out the energy degrees of freedom of the loop momenta (yielding the Loop-Tree Duality), I show how the threshold singularities can be locally removed from the integration domain by subtracting...

42. Higgs boson production at the next-to-next-to-leading power

Alexander Penin

28/06/2023, 10:15

10. Analytic result for the top-quark width at next-to-next-to-leading order in QCD

Prof. Jian Wang (Shandong University)

We present the first full analytic results of next-to-next-to-leading order (NNLO) QCD corrections to the top-quark decay width Γ(t → W b) by calculating the imaginary part of three-loop top-quark self-energy diagrams. The results are all expressed in terms of harmonic polylogarithms and valid in the whole region 0 ≤ mW ≤ mt. The expansions in the mW → 0 and mW → mt limits coincide with...

36. Collinear Parton Dynamics

Ian James Moult, Ian James Moult (Massachusetts Inst. of Technology (US))

13. High order calculations for ee→HZ and ee→ttbar

Xiang Chen (Peking University)

We have leveraged cutting-edge techniques to calculate the two-loop electroweak corrections for the ee→HZ process and the N3LO QCD corrections for the ee→ttbar process. These high-order calculations will support precise measurements at future lepton colliders. In my talk, I will discuss both the phenomenological outcomes and the underlying methodologies employed.