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We present precise predictions for four-lepton plus jets production at the LHC obtained within the fully automated Sherpa+OpenLoops framework. Off-shell intermediate vector bosons and related interferences are consistently included using…

高能物理 - 唯象学 · 物理学 2015-06-17 Fabio Cascioli , Stefan Hoeche , Frank Krauss , Philipp Maierhofer , Stefano Pozzorini , Frank Siegert

We present methods to achieve NLL+NLO accurate parton showering for processes with two coloured legs: neutral- and charged-current Drell-Yan, and Higgs production in $pp$ collisions, as well as DIS and $e^+e^-$ to jets. The methods include…

We present predictions for Higgs production via gluon fusion with a p_T veto on jets and with the resummation of jet-veto logarithms at NNLL'+$NNLO order. These results incorporate explicit O(alphas^2) calculations of soft and beam…

高能物理 - 唯象学 · 物理学 2014-03-12 Iain W. Stewart , Frank J. Tackmann , Jonathan R. Walsh , Saba Zuberi

We present a next-to-next-to-leading order accurate description of Drell-Yan lepton pair production processes through $\gamma^*/Z$ or $W$ exchange that includes consistently parton shower effects. Results are obtained by upgrading the…

高能物理 - 唯象学 · 物理学 2015-06-22 Alexander Karlberg , Emanuele Re , Giulia Zanderighi

Calculations for processes involving a high multiplicity of coloured particles often employ a leading colour approximation, where only the leading terms in the expansion of the number of colours $N_c$ and the number of flavours $n_f$ are…

高能物理 - 唯象学 · 物理学 2022-09-21 X. Chen , T. Gehrmann , E. W. N. Glover , A. Huss , J. Mo

We present a general method to match fully differential next-to-next-to-leading (NNLO) calculations to parton shower programs. We discuss in detail the perturbative accuracy criteria a complete NNLO+PS matching has to satisfy. Our method is…

高能物理 - 唯象学 · 物理学 2015-06-17 Simone Alioli , Christian W. Bauer , Calvin Berggren , Frank J. Tackmann , Jonathan R. Walsh , Saba Zuberi

We present the implementation of several color-singlet final-state processes at Next-to-Next-to Leading Order (NNLO) accuracy in QCD to the publicly available parton-level Monte Carlo program MCFM. Specifically we discuss the processes…

We discuss the GENEVA Monte Carlo framework, which combines higher-order resummation (NNLL) of large Sudakov logarithms with multiple next-to-leading-order (NLO) matrix-element corrections and parton showering (using PYTHIA8) to give a…

We present the computation of Higgs boson plus one jet production at NNLO at the LHC. The computation is carried out in the heavy-top-quark approximation and using the antenna subtraction formalism to handle the IR divergent structure of…

高能物理 - 唯象学 · 物理学 2016-04-15 Xuan Chen , Thomas Gehrmann , Nigel Glover , Matthieu Jaquier

We describe a number of improvements to the GENEVA method for matching NNLO calculations to parton shower programs. In particular, we detail changes to the resummed calculation used in the matching procedure, including disentangling the…

We present a next-to-next-to-leading order accurate description of associated HW production consistently matched to a parton shower. The method is based on reweighting events obtained with the HW plus one jet NLO accurate calculation…

高能物理 - 唯象学 · 物理学 2016-07-20 William Astill , Wojciech Bizon , Emanuele Re , Giulia Zanderighi

We present the first calculation of inclusive jet production in deep-inelastic scattering with approximate next-to-next-to-leading order (aNNLO) contributions, obtained from a unified threshold resummation formalism. The leading…

高能物理 - 唯象学 · 物理学 2015-11-04 T. Biekötter , M. Klasen , G. Kramer

Using the technology of the CAESAR approach to resummation, we examine the jet-veto efficiency in Higgs-boson and Drell-Yan production at hadron colliders and show that at next-to-leading logarithmic (NLL) accuracy the resummation reduces…

高能物理 - 唯象学 · 物理学 2015-06-04 Andrea Banfi , Gavin P. Salam , Giulia Zanderighi

We present the high-precision result for the zero-jettiness soft function at next-to-next-to-next-to-leading order (N3LO) in perturbative QCD. At this perturbative order, the soft function is the last missing ingredient required for the…

高能物理 - 唯象学 · 物理学 2025-05-19 Daniel Baranowski , Maximilian Delto , Kirill Melnikov , Andrey Pikelner , Chen-Yu Wang

We derive the leading-power singular terms at three loops for both $q_T$ and 0-jettiness, $\cal{T}_0$, for generic color-singlet processes. Our results provide the complete set of differential subtraction terms for $q_T$ and $\cal{T}_0$…

高能物理 - 唯象学 · 物理学 2021-02-18 Georgios Billis , Markus A. Ebert , Johannes K. L. Michel , Frank J. Tackmann

Matched calculations combining perturbative QCD with parton showers are an indispensable tool for LHC physics. Two methods for NLO matching are in widespread use: MC@NLO and POWHEG. We describe an alternative, KrkNLO, reformulated to be…

高能物理 - 唯象学 · 物理学 2025-02-03 Pratixan Sarmah , Andrzej Siódmok , James Whitehead

We propose the use of 1-jettiness, a global event shape, for exclusive single jet production in lepton-nucleus deep inelastic scattering (DIS). We derive a factorization formula, using the Soft-Collinear Effective Theory, differential in…

高能物理 - 唯象学 · 物理学 2014-01-13 Zhong-Bo Kang , Xiaohui Liu , Sonny Mantry , Jian-Wei Qiu

We present the implementation of next-to-next-to-leading order (NNLO) QCD fully-differential corrections within the GENEVA framework, for both colour-singlet and colour-singlet+jet processes at hadron colliders, by employing a nonlocal…

高能物理 - 唯象学 · 物理学 2025-04-16 Simone Alioli , Georgios Billis , Alessandro Broggio , Giovanni Stagnitto

We present a subtraction method utilizing the N-jettiness observable, Tau_N, to perform QCD calculations for arbitrary processes at next-to-next-to-leading order (NNLO). Our method employs soft-collinear effective theory (SCET) to determine…

高能物理 - 唯象学 · 物理学 2015-09-29 Jonathan Gaunt , Maximilian Stahlhofen , Frank J. Tackmann , Jonathan R. Walsh

We consider the class of inclusive hadron collider processes in which one or more energetic jets are produced, possibly accompanied by colourless particles. We provide a general formulation of a slicing scheme for this class of processes,…

高能物理 - 唯象学 · 物理学 2024-05-15 Luca Buonocore , Massimiliano Grazzini , Jürg Haag , Luca Rottoli , Chiara Savoini