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We derive an improved prescription for the merging of matrix elements with parton showers, extending the CKKW approach. A flavour-dependent phase space separation criterion is proposed. We show that this new method preserves the logarithmic…

High Energy Physics - Phenomenology · Physics 2010-03-05 Stefan Hoeche , Frank Krauss , Steffen Schumann , Frank Siegert

We study parton-branching solutions of QCD evolution equations and present a method to construct both collinear and transverse momentum dependent (TMD) parton densities from this approach. We work with next-to-leading-order (NLO) accuracy…

High Energy Physics - Phenomenology · Physics 2018-02-14 F. Hautmann , H. Jung , A. Lelek , V. Radescu , R. Zlebcik

We investigate associated prompt photon and hadronic jet production at the LHC energies using the $k_T$-factorization approach. Our consideration is based on the $\mathcal O(\alpha\alpha_s^2)$ off-shell gluon-gluon fusion subprocess…

High Energy Physics - Phenomenology · Physics 2019-09-10 A. V. Lipatov , M. A. Malyshev , H. Jung

The properties of high-mass multijet events produced at the Fermilab proton-antiproton collider are compared with leading order QCD matrix element predictions, QCD parton shower Monte Carlo predictions, and the predictions from a model in…

High Energy Physics - Experiment · Physics 2010-05-12 F. Abe

We propose the lepton-jet correlation in deep inelastic scattering as a unique tool for nucleon/nucleus tomography at the electron-ion collider. The azimuthal angular correlation between the final state lepton and jet depends on the…

High Energy Physics - Phenomenology · Physics 2019-05-22 Xiaohui Liu , Felix Ringer , Werner Vogelsang , Feng Yuan

We study 3-jet event topologies in proton-proton collisions at a centre-of-mass energy of $\sqrt{s} = 13 {\rm\ TeV}$ in a configuration, where one jet is present in the central pseudorapidity region ($|\eta| < 2.0$) while two other jets are…

High Energy Physics - Phenomenology · Physics 2020-08-26 H. Van Haevermaet , A. Van Hameren , P. Kotko , K. Kutak , P. Van Mechelen

We propose a general approach for the description of multijet events in the framework of QCD event generators. We introduce a new algorithm to match parton showers and arbitrary matrix elements for the production of any number of jets via…

High Energy Physics - Phenomenology · Physics 2009-10-31 F. Krauss , R. Kuhn , G. Soff

We present a study of the transverse size of parton showers and their diminishing interaction with the medium in the high virtuality stage of jet evolution. We consider the process of a hard quark produced in deep inelastic scattering off a…

High Energy Physics - Phenomenology · Physics 2025-01-15 Amit Kumar , Abhijit Majumder , Chathuranga Sirimanna , Yasuki Tachibana

We study the lepton-jet correlation in deep inelastic scattering. We perform one-loop calculations for the spin averaged and transverse spin dependent differential cross sections depending on the total transverse momentum of the final state…

High Energy Physics - Phenomenology · Physics 2020-11-25 Xiaohui Liu , Felix Ringer , Werner Vogelsang , Feng Yuan

In this mini review article, the transverse momentum spectra of final-state particles produced in high energy hadron-hadron, hadron-nucleus, and nucleus-nucleus collisions described by the multi-source thermal model at the quark or parton…

High Energy Physics - Phenomenology · Physics 2022-03-04 Fu-Hu Liu , Jia-Yu Chen , Qiang Zhang

An azimuthal angle correlation between the two hardest jets is studied in the ttbar production process at the 14 TeV LHC. The event samples are generated by merging the tree level matrix elements for the ttbar plus up to 2 or 3 partons with…

High Energy Physics - Phenomenology · Physics 2015-08-10 Kaoru Hagiwara , Junya Nakamura

Final states with a vector boson and a hadronic jet allow one to infer the Born-level kinematics of the underlying hard scattering process, thereby probing the partonic structure of the colliding protons. At forward rapidities, the parton…

High Energy Physics - Phenomenology · Physics 2019-06-26 A. Gehrmann-De Ridder , T. Gehrmann , E. W. N. Glover , A. Huss , D. M. Walker

We compute resummed and matched predictions for jet angularities in hadronic dijet and Z+jet events with and without grooming the candidate jets using the SoftDrop technique. Our theoretical predictions also account for non-perturbative…

High Energy Physics - Phenomenology · Physics 2022-03-23 Daniel Reichelt , Simone Caletti , Oleh Fedkevych , Simone Marzani , Steffen Schumann , Gregory Soyez

We study the associated production of real (isolated) or virtual photons (with their subsequent leptonic decay) and hadronic jets in proton-proton collisions at the LHC using the $k_T$-factorization approach of QCD. The consideration is…

High Energy Physics - Phenomenology · Physics 2014-11-12 A. V. Lipatov , N. P. Zotov

Using a generalized parton model approach including spin and intrinsic parton motion effects, and assuming the validity of factorization for large p_T jet production in hadronic collisions, we study the azimuthal distribution around the jet…

High Energy Physics - Phenomenology · Physics 2011-09-14 Umberto D'Alesio , Francesco Murgia , Cristian Pisano

Recent measurements of selected QCD processes at the Tevatron are reviewed and confronted with theoretical calculations. Results on inclusive jet production at large transverse momentum are compared to predictions from next-to-leading order…

High Energy Physics - Experiment · Physics 2007-05-23 Marek Zielinski

Jet calculus offers a unique mathematical technique to bridge the area of QCD resummation with Monte Carlo parton showers. With the ultimate goal of constructing next-to-next-to-leading logarithmic (NNLL) parton showers we study, using the…

High Energy Physics - Phenomenology · Physics 2024-04-24 Melissa van Beekveld , Mrinal Dasgupta , Basem Kamal El-Menoufi , Jack Helliwell , Pier Francesco Monni

Jets are algorithmic proxies of hard scattered partons, i.e. quarks and gluons, in high energy particle collisions. The STAR collaboration presents the first measurements of substructure observables at the first, second and third splits in…

High Energy Physics - Experiment · Physics 2021-08-02 Raghav Kunnawalkam Elayavalli

We study contributions from nonperturbative effects and parton showering in NLO event generators, and present applications to jet final states. We find pT-dependent and rapidity-dependent corrections which can affect the shape of observed…

High Energy Physics - Phenomenology · Physics 2013-04-29 S. Dooling , P. Gunnellini , F. Hautmann , H. Jung

Ultra-relativistic heavy-ion collisions are a window of opportunity to study QCD matter under extreme conditions of temperature and density, such as the quark-gluon plasma. Among the several possibilities, the study of jet quenching -…

High Energy Physics - Phenomenology · Physics 2015-05-26 Liliana Apolinário , Néstor Armesto , Guilherme Milhano , Carlos A. Salgado
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