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We analyse the production of a Higgs boson in association with a Z boson at hadron colliders in the Standard Model and some simple extensions. We show how multi-jet merging algorithms at leading and next-to-leading order for the…

High Energy Physics - Phenomenology · Physics 2015-10-14 Dorival Goncalves , Frank Krauss , Silvan Kuttimalai , Philipp Maierhöfer

The $W$-pair production in association with a massive (anti)bottom jet is not only an important background to a number of interesting processes, such as the single top production associated with a W boson, but also a potential background to…

High Energy Physics - Phenomenology · Physics 2011-08-19 Yan Han , Wang Shao-Ming , Ma Wen-Gan , Zhang Ren-You , Guo Lei

The six-fermion production processes $e^+e^-\to q\bar q l^+ l^-\nu\bar\nu$, with all the lepton flavours and $q=u,d,c,s$, relevant to the study of the intermediate-mass Higgs boson at future $e^+e^-$ linear colliders, are analysed. A Monte…

High Energy Physics - Phenomenology · Physics 2011-09-13 F. Gangemi , G. Montagna , M. Moretti , O. Nicrosini , F. Piccinini

In these proceedings we present results from a recent calculation for the production of a W boson in conjunction with five jets at next-to-leading order in perturbative QCD. We also use results at lower multiplicities to extrapolate the…

High Energy Physics - Phenomenology · Physics 2013-08-20 Z. Bern , L. J. Dixon , F. Febres Cordero , S. Höche , H. Ita , D. A. Kosower , K. J. Ozeren , D. Maître

The paper presents a measurement of the Standard Model Higgs Boson decaying to $b$-quark pairs in the vector boson fusion (VBF) production mode. A sample corresponding to 126 fb$^{-1}$ of $\sqrt{s} =$ 13 TeV proton-proton collision data,…

High Energy Physics - Experiment · Physics 2021-06-30 ATLAS Collaboration

A new release of the Monte Carlo event generator Herwig (version 7.1) is now available. This version introduces a number of improvements, notably: multi-jet merging with the dipole shower at LO and NLO QCD; a new model for soft interactions…

We report on a search for the standard-model Higgs boson in $p\bar{p}$ collisions at $\sqrt{s}=1.96$ TeV using an integrated luminosity of 2.0/fb. We look for production of the Higgs boson decaying to a pair of bottom quarks in association…

High Energy Physics - Experiment · Physics 2010-05-12 The CDF Collaboration , Aaltonen T. et al

We introduce the first family of parton showers that achieve next-to-leading logarithmic (NLL) accuracy for processes involving a $t$-channel exchange of a colour-singlet, and embed them in the PanScales framework. These showers are…

High Energy Physics - Phenomenology · Physics 2024-02-06 Melissa van Beekveld , Silvia Ferrario Ravasio

The charged current production of long-lived heavy neutrinos at the LHC can use a prompt charged lepton for triggering the measurement of the process. However, in order to fully characterize the heavy neutrino interactions, it is necessary…

High Energy Physics - Phenomenology · Physics 2021-09-07 J. Jones-Pérez , J. Masias , J. D. Ruiz-Álvarez

The comparison of the kinematic properties of different Vector Boson Scattering (VBS) and Vector Boson Fusion (VBF) processes using multivariate discriminator is presented. The search is performed to identify common features in the the…

High Energy Physics - Experiment · Physics 2023-05-29 Kadri Ozdemir

The associated production of Higgs and $W$ bosons via vector-boson fusion (VBF) is highly sensitive to the relative sign of the Higgs boson couplings to $W$ and $Z$ bosons. In this Letter, two searches for this process are presented, using…

High Energy Physics - Experiment · Physics 2024-10-07 ATLAS Collaboration

This is the user's manual of MC@NLO 3.4. This package is a practical implementation, based upon the HERWIG event generator, of the MC@NLO formalism, which allows one to incorporate NLO QCD matrix elements consistently into a parton shower…

High Energy Physics - Phenomenology · Physics 2008-12-04 Stefano Frixione , Bryan R. Webber

A major new release of the Monte Carlo event generator Herwig++ (version 3.0) is now available. This release marks the end of distinguishing Herwig++ and HERWIG development and therefore constitutes the first major release of version 7 of…

A new release of the Monte Carlo program Herwig++ (version 2.5) is now available. This version comes with a number of improvements including: new next-to-leading order matrix elements, including weak boson pair production; a colour…

High Energy Physics - Phenomenology · Physics 2011-02-09 S. Gieseke , D. Grellscheid , K. Hamilton , A. Papaefstathiou , S. Plätzer , P. Richardson , C. A. Röhr , P. Ruzicka , A. Siódmok , L. Suter , D. Winn

We consider higher-order QCD corrections to the production of colourless high-mass systems (lepton pairs, vector bosons, Higgs bosons,...) in hadron collisions. We propose a new formulation of the subtraction method to numerically compute…

High Energy Physics - Phenomenology · Physics 2008-11-26 S. Catani , M. Grazzini

We present version 2.1 of the High Energy Jets (HEJ) event generator for hadron colliders. HEJ is a Monte Carlo generator for processes at high energies with multiple well-separated jets in the final state. To achieve accurate predictions,…

High Energy Physics - Phenomenology · Physics 2022-06-01 Jeppe R. Andersen , James Black , Helen Brooks , Bertrand Ducloué , Marian Heil , Andreas Maier , Jennifer M. Smillie

The production of Higgs bosons in weak boson fusion has the second largest cross section among Higgs-production processes at the LHC. As such, this process plays an important role in detailed studies of Higgs interactions with vector…

High Energy Physics - Phenomenology · Physics 2023-03-08 Konstantin Asteriadis , Fabrizio Caola , Kirill Melnikov , Raoul Röntsch

We present an NLO simulation of WWbb production with massive b-quarks at the LHC. Off-shell and non-resonant contributions associated with top-pair and single-top channels and with leptonic W-boson decays are consistently taken into account…

High Energy Physics - Phenomenology · Physics 2015-06-18 F. Cascioli , S. Kallweit , P. Maierhöfer , S. Pozzorini

In this contribution we present results from the NLO computation of the production of a $W$ boson in association with three jets in hadronic collisions. The results are obtained by combining two programs: {\tt BlackHat} for the virtual…

High Energy Physics - Phenomenology · Physics 2014-11-20 C. F. Berger , Z. Bern , L. J. Dixon , F. Febres Cordero , D. Forde , T. Gleisberg , H. Ita , D. A. Kosower , D. Maitre

We study WZ production with anomalous couplings at $\bar{n}$NLO QCD using the LoopSim method in combination with the Monte Carlo program VBFNLO. Higher order corrections to WZ production are dominated by additional hard jet radiation. Those…

High Energy Physics - Phenomenology · Physics 2016-12-13 Francisco Campanario , Robin Roth , Sebastian Sapeta , Dieter Zeppenfeld