Conveners
Electroweak and Higgs Physics, EFT and BSM
- Paolo Torrielli (Istituto Nazionale di Fisica Nucleare)
Electroweak and Higgs Physics, EFT and BSM
- Colomba Brancaccio (Istituto Nazionale di Fisica Nucleare)
Electroweak and Higgs Physics, EFT and BSM
- Davide Napoletano (Università e INFN Milano-Bicocca)
The charged current Drell-Yan process plays a crucial role at hadron colliders since it provides the environment for a precise study of the gauge sector of the Standard Model and, in particular, for the determination of the W-boson mass. In this talk, we will present our recent computation of the mixed QCD-EW two-loop virtual amplitudes for this process, which constitute one of the main...
In this talk I plan to discuss the QCD+QED corrections to Light by Light scattering (LbL) process at next-to-leading order (NLO). The recent experimental observation of this fundamental process at the Large Hadron Collider has revived the interest to precisely predict its cross-section. We discuss two radically different computational approaches, both exact in the fermion mass dependence, thus...
We report on the analytic calculation of the Electron Self Energy in Quantum Electrodynamics at three loops. Feynman integrals appearing in the problem are evaluated via the method of differential equations. In particoular, we will discuss how to cast the system of differential equations -- including elliptic secrors -- in an eps-factorized form via suitable transformation(s), thus (almost)...
In this talk, I will present analytic techniques for massive two-loop four-point Feynman integrals at high energies and the toolbox AsyInt. In the high-energy region, the Feynman integrals involving massive particles, such as the top quark, Higgs and vector bosons, can be asymptotically expanded and directly calculated in the small-mass limit. With AsyInt, analytic results for higher-order...
The upcoming HL-LHC phase gives hope to tighten the experimental
constraints on one of the core parameters of the SM: the Higgs
self-coupling. The most prolific process to consider in this context is
double Higgs boson production. Theoretical higher order calculations,
both QCD and electro-weak, are required to match the experimental precision.
In this talk we present our calculation of...
In this talk I will present recent efforts to calculate analytic results for double Higgs production at the LHC, concentrating on the virtual corrections to the gluon fusion channel.
On the one hand, I will report on recent results on electro-weak corrections to this process.
On the other hand, the extension of the calculation to NNLO QCD corrections is discussed.
Our methods are based on...
We present NLO QCD results for Higgs boson production in association with one jet, including anomalous Higgs-top and Higgs-gluon couplings, and with full top quark mass dependence. We will compare the full theory with varied anomalous couplings to the Standard Model. Of special interest will be the $p_{T,H}$ distribution, since the high $p_{T,H}$ tail is sensitive to heavy new physics.
At hadronic colliders, the Drell-Yan processes are crucial for testing the Standard Model via the template-fit determination of electroweak parameters, such as the W-boson mass and the weak mixing angle. Monte Carlo event generators play an important role to provide reliable templates for such measurements.
The Z_ew-BMNNPV code is dedicated to the simulation of neutral-current Drell-Yan in...
I will present a computation of two-loop amplitudes contributing to W+2 photon production at the Large Hadron Collider. We adopt a hybrid approach where analytic results are derived for the leading colour contribution while the subleading colour amplitudes are evaluated numerically, both within the finite-field framework. The size of subleading colour contribution is studied, by evaluating the...
I will present a fully automated implementation of next-to-leading order electroweak (NLO EW) corrections in the logarithmic Sudakov approximation in OpenLoops. For energies above the electroweak scale, NLO EW corrections are logarithmically enhanced and for tails of kinematic distributions of crucial LHC processes yield correction factors of several tens of percent. The considered Sudakov...
Tri-boson production, together with vector-boson scattering and Higgs-strahlung, is a privileged channel to study the EW structure of the Standard Model. Upcoming LHC running stages will soon allow to measure them at unprecedented accuracy and for all possible final states, which requires to push theory predictions to still unexplored frontiers.
In this talk I will present the first...
The superweak (SW) force is a minimal, anomaly-free U(1) extension of the standard model (SM) with a complex scalar and three sterile right-handed neutrions. The SWSM is designed to explain the origin of (i) neutrino masses and mixing matrix elements, (ii) dark matter, (iii) cosmic inflation, (iv) stabilization of the electroweak vacuum and (v) leptogenesis. In this talk we present precision...
We present the open-source SIMUnet code, designed to fit Standard Model Effective Field Theory (SMEFT) Wilson coefficient alongside Parton Distribution Functions (PDFs) of the proton. SIMUnet can perform SMEFT global fits, as well as simultaneous fits of the PDFs and of an arbitrarily large number of SMEFT degrees of freedom, by including both PDF-dependent and PDF-independent observables....
