Conveners
Precision QCD corrections
- Raquel Gomez Ambrosio (Istituto Nazionale di Fisica Nucleare)
Precision QCD corrections
- Thomas Becher (University of Bern)
Precision QCD corrections
- Roberto Bonciani (Istituto Nazionale di Fisica Nucleare)
We present the first NNLO-accurate event generation for $Z$ boson production in association with a bottom-quark pair. This is achieved by matching the NNLO calculation in the 4FS to a parton shower within the MiNNLO method, which we extend to accommodate the class of processes with a color singlet and a heavy-quark pair in the final state. We find that NNLO corrections to $Zb\bar{b}$...
We present our results for complete next-to-leading order QCD corrections to ZZ production through gluon fusion. We combine the two-loop amplitudes with top quark mass dependence calculated numerically in a previous work with the analytic forms of massless, Higgs-mediated, and one-loop factorisable diagrams to obtain complete virtual corrections. We show that the choice of IR subtraction...
One of the motivations underlying the efforts towards higher-order computations of heavy-flavour production is the possibility to better constrain parton distribution functions as well as heavy-quark mass values. In this contribution we focus on the top-quark case and we discuss the impact of including higher-order corrections to top-antitop and single-top production at hadron colliders on the...
We examine the effect of finite top- and bottom-quark masses on the Higgs production cross section in the gluon-gluon fusion channel. We employ both $\overline{\text{MS}}$ and on-shell renormalisation for the quark masses and provide a thorough comparison. Furthermore, we explore alternative treatments of quark masses, in particular in the four-flavour scheme, and investigate their impact on...
We report on computing the NNNLO zero-jettiness QCD soft function, the last missing ingredient required for the first application of the subtraction scheme with jettiness as a slicing variable at the NNNLO level.
In this talk, we present some technical details in the calculation of triple real contributions to the zero-jettiness soft function at N3LO. We use extended reverse unitarity to handle Heaviside functions in the integral reduction and compute master integrals by solving differential equations with respect to an auxiliary parameter. Additional complications introduced by the analytic regulator...
Diboson processes being the key to study the electroweak triple gauge-boson couplings, triboson processes pave the way to investigate the quartic. Moreover, with leptonic decay products from multiple gauge bosons, they provide dominant backgrounds to many New Physics searches. With the increasing statistics collected by the LHC, and in particular in view of the HL-LHC running phase, precise...
I will present our recent calculation of previously unavailable NNLO contributions to electroweak vector boson production. For the first time at two loops, we enable their direct numerical integration by tackling infrared, ultraviolet and threshold singularities simultaneously using local subtractions. I will discuss our numerical method and describe the next steps towards calculating the full...
In this talk, we combine the four-flavor scheme (4FS) and five-flavor scheme (5FS) into a single prediction such that it retains finite mass effects through a certain order in perturbation theory while at the same time resums the collinear logarithms to all orders in the strong coupling constant ($\alpha_s)$. We match the N$^3$LO 5FS result for the neutral-current Drell-Yan process including...
I will present recent results for three-loop amplitudes with one off-shell and three on-shell legs, relevant for V+jet and H+jet production in hadron colliders at N3LO in QCD.
We present progress on the calculation of the virtual NNLO corrections to $t\bar{t}H$ production in the $qq$-channel. We focus on the numerical evaluation of the master integrals with pySecDec, and the associated challenge of constructing a grid for a $5$-point amplitude.
I will talk about a factorization formula for gauge-theory scattering amplitudes up to two loops in the high-energy boosted limit at leading power, which is then used to give the prediction for the production of a Higgs boson in association with a top-antitop quark pair ($t\bar{t}H$) at next-to-next-to-leading order (NNLO). This process holds significant importance in directly probing the...
We consider the Energy-Energy Correlation function in electron-positron annihilation to hadrons. We concentrate on the back-to-back region, performing all-order resummation of the logarithmically enhanced contributions in QCD perturbation theory, up to next-to-next-to-next-to-leading logarithmic (N^3LL) accuracy. Away from the back-to-back region, we consistently combine resummed predictions...
