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Standard Model and Higgs Physics at the LHC

Applicant Grazzini Massimiliano
Number 169041
Funding scheme Project funding
Research institution Institut für Theoretische Physik Universität Zürich
Institution of higher education University of Zurich - ZH
Main discipline Particle Physics
Start/End 01.10.2016 - 30.09.2019
Approved amount 401'619.00
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Keywords (3)

Perturbative computations; Standard Model; Higgs physics

Lay Summary (Italian)

Lead
Lo scopo di questo progetto e' ottenere predizioni teoriche accurate per i processi di produzione di coppie di bosoni vettori, quark pesanti e per la produzione del bosone di Higgs in collisioni adroniche. Nel caso della produzione di bosoni vettori e quark pesanti, abbiamo in programma di continuare il lavoro iniziato estendendo in modo sistematico l'accuratezza dei calcoli attuali all'ordine successivo (NNLO). Nel caso del bosone di Higgs vogliamo includere nei calcoli gia' esistenti l'effetto di piccole deviazioni dal Modello Standard.
Lay summary
In questo progetto si considerano importanti processi di scattering in collisioni adroniche: produzione di coppie di bosoni vettori, di quark pesanti e del bosone di Higgs. Lo scopo del progetto e' duplice. Nel caso della produzione di coppie di bosoni vettori e di quark pesanti, vogliamo continuare il lavoro iniziato ed estendere l'accuratezza delle predizioni teoriche di QCD al secondo ordine nella teoria delle perturbazioni, includendo i contributi dominanti a piccoli momenti trasversi a tutti gli ordini. In particolare, vogliamo completare lo sviluppo di un codice numerico che permetta di studiare la cinematica completa di questi processi, includendo il decadimento dei bosoni vettori, e possa essere usato dalle collaborazioni sperimentali. Nel caso della produzione di quark pesanti, che coinvolge particelle colorate nello stato finale, vogliamo estendere i nostri codici numerici per tenere conto della radiazione di QCD dai quark pesanti. Nel caso della produzione del bosone di Higgs calcoli al secondo ordine della teoria delle perturbazioni esistono gia'. Vogliamo estendere questi risultati includendo l'effetto di piccole deviazioni dal modello Standard nello studio delle distribuzioni differenziali, usando un approccio di lagrangiana effettiva.
 
Direct link to Lay Summary Last update: 28.09.2016

Responsible applicant and co-applicants

Employees

Publications

Publication
Top-quark pair production at the LHC: fully differential QCD predictions at NNLO
Catani Stefano, Devoto Simone, Grazzini Massimiliano, Kallweit Stefan, Mazzitelli Javier (2019), Top-quark pair production at the LHC: fully differential QCD predictions at NNLO, in Journal of High Energy Physics, 2019(7), 100-100.
Top-quark pair hadroproduction at next-to-next-to-leading order in QCD
Catani Stefano, Devoto Simone, Grazzini Massimiliano, Kallweit Stefan, Mazzitelli Javier, Sargsyan Hayk (2019), Top-quark pair hadroproduction at next-to-next-to-leading order in QCD, in Physical Review D, 99(5), 051501-051501.
ZZ production at the LHC: NLO QCD corrections to the loop-induced gluon fusion channel
Grazzini Massimiliano, Kallweit Stefan, Wiesemann Marius, Yook Jeong Yeon (2019), ZZ production at the LHC: NLO QCD corrections to the loop-induced gluon fusion channel, in Journal of High Energy Physics, 2019(3), 70-70.
Transverse-momentum resummation for top-quark pair production at the LHC
Catani Stefano, Grazzini Massimiliano, Sargsyan Hayk (2018), Transverse-momentum resummation for top-quark pair production at the LHC, in Journal of High Energy Physics, 2018(11), 61-61.
Fully differential NNLO computations with MATRIX
Grazzini Massimiliano, Kallweit Stefan, Wiesemann Marius (2018), Fully differential NNLO computations with MATRIX, in The European Physical Journal C, 78(7), 537-537.
Higgs boson pair production at NNLO with top quark mass effects
Grazzini M., Heinrich G., Jones S., Kallweit S., Kerner M., Lindert J. M., Mazzitelli J. (2018), Higgs boson pair production at NNLO with top quark mass effects, in Journal of High Energy Physics, 2018(5), 59-59.
Azimuthal asymmetries in QCD hard scattering: infrared safe but divergent
Catani Stefano, Grazzini Massimiliano, Sargsyan Hayk (2017), Azimuthal asymmetries in QCD hard scattering: infrared safe but divergent, in Journal of High Energy Physics, 2017(6), 17-17.
W ± Z production at the LHC: fiducial cross sections and distributions in NNLO QCD
Grazzini Massimiliano, Kallweit Stefan, Rathlev Dirk, Wiesemann Marius (2017), W ± Z production at the LHC: fiducial cross sections and distributions in NNLO QCD, in Journal of High Energy Physics, 2017(5), 139-139.

Collaboration

Group / person Country
Types of collaboration
Prof. Daniel de Florian, University of San Martin Argentina (South America)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
- Exchange of personnel
Dr. Stefano Catani, INFN, Sezione di Firenze Italy (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
Dr. Stefan Kallweit, Johannes-Gutenberg-University Mainz Germany (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
Dr. Dirk Rathlev, DESY Germany (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
Gudrun Heinrich, MPI Munich Germany (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Publication

Scientific events

Active participation

Title Type of contribution Title of article or contribution Date Place Persons involved
Radcor 2019 Talk given at a conference Top-quark hadroproduction in NNLO QCD 09.09.2019 Avignon, France Devoto Simone;
Radcor 2019 Talk given at a conference Soft-gluon effective coupling and cusp anomalous dimension 09.09.2019 Avignon, France Grazzini Massimiliano;
Loopfest XVIII Talk given at a conference Top-quark hadroproduction in NNLO QCD 12.08.2019 Fermilab, United States of America Devoto Simone;
QCD@LHC 2019 Talk given at a conference Higher-order calculations and precision phenomenology 15.07.2019 Buffalo, United States of America Grazzini Massimiliano;
QCD@LHC 2019 Talk given at a conference Vector boson pair production at the LHC: NLO QCD corrections to the loop-induced gluon fusion contribution 15.07.2019 Buffalo, United States of America Yook Jeong Yeon;
Moriond QCD 2019 Talk given at a conference ZZ production at the LHC: NLO QCD corrections to the loop-induced gluon fusion channel 23.03.2019 La Thuile, Italy Yook Jeong Yeon;
HP2 2018 Talk given at a conference NLO QCD corrections to gluon loop-induced ZZ production at the LHC 01.10.2018 Freiburg, Germany Yook Jeong Yeon;
HP2 2018 Talk given at a conference Heavy-quark production at NNLO 01.10.2018 Freiburg, Germany Devoto Simone;
Loopfest 2018 Talk given at a conference Top-pair production at the LHC: transverse-momentum resummation and azimuthal asymmetries 16.07.2018 Michigan State University, United States of America Grazzini Massimiliano;
Rencontres de Blois 2018 Talk given at a conference Theory status of diboson processes 03.06.2018 Blois, France Grazzini Massimiliano;
Subtracting IR singularities beyond NLO Talk given at a conference Recent developments in qt subtraction 18.04.2018 Edinbourgh, Great Britain and Northern Ireland Grazzini Massimiliano;
Radcor 2017 Talk given at a conference Azimuthal asymmetries in QCD hard scattering: infrared safe but divergent 24.09.2017 St. Gilgen, Austria Grazzini Massimiliano;
Higgstools final meeting Talk given at a conference Azimuthal asymmetries in QCD hard scattering: infrared safe but divergent 13.09.2017 Duhram, Great Britain and Northern Ireland Grazzini Massimiliano;
Multiboson Interactions 2017 Talk given at a conference Status of QCD corrections for multiboson processes 28.08.2017 Karlsruhe, Germany Grazzini Massimiliano;
Higgs Hunting 2017 Talk given at a conference Theory improvements for Run 2 and beyond 24.07.2017 Paris, France Grazzini Massimiliano;
Loopfest 2017 Talk given at a conference NNLO calculations with MATRIX 31.05.2017 Argonne, United States of America Grazzini Massimiliano;


Associated projects

Number Title Start Funding scheme
188464 Precision Standard Model Physics at the LHC and beyond 01.01.2020 Project funding
160814 Particle Physics with high-quality data from the CERN LHC 01.10.2015 Sinergia
173357 Probing the Higgs sector at the LHC and beyond 01.05.2018 Argentina (AJRP)
156585 Standard Model and Higgs Physics at the LHC 01.10.2014 Project funding

Abstract

The first run of the LHC was a great success for the Standard Model (SM). Despite some intriguing hints of possible new physics signals, which definitely require more data from the Run 2 to be confirmed or disproved, no evidence for new physics has been observed, and the newly discovered Higgs resonance appears very close to what expected in the SM. After the long shutdown the LHC has started its second phase at an increased centre-of-mass energy of 13 TeV in 2015, though with limited luminosity. This year the ATLAS and CMS experiments plan to accumulate a much larger data set which will allow to resume the search for new physics signals and to better study the properties of the Higgs boson.This project is focused on physics processes that are particularly relevant at the LHC:vector-boson pair production, Higgs and top-quark production. The production of vector boson pairs is among the most important electroweak processes at hadron colliders. It allows detailed studies of the gauge symmetry structure of electroweak interactions and of the mechanism of electroweak symmetry breaking. Moreover, vector boson pair production is a crucial background for Higgs and new physics searches. The Higgs boson production processes are of course of paramount importance, especially after the discovery of the new scalar resonance in July 2012. In particular, the production of two Higgs bosons will be crucial to study the Higgs potential, which is completely fixed in the SM, but can be modified in BSM scenarios. The production of heavy quarks is another key process at hadron colliders and it has received a great attention in the last few years.The aim of this research project is as follows.In the case of vector-boson pair production and heavy-quark production,we plan to continue our activity towards the systematic extension of the accuracy of the theoretical predictions to next-to-next-to-leading order (NNLO),and to include the dominant logarithmically enhanced contributions at small transverse momenta to all perturbative orders. In particular, we plan to continue our work to deliver a flexible numerical program which allows the user to study the full event kinematics and can be used by the experimental collaborations. As for heavy-quark production, which involves colored particles in the final state, we will extend the available numerical programs to perform fixed order and resummed calculations to treat the additional soft radiation from the top-quark pair.The results we envisage are eagerly waited in the community. They will have an important role on current and future collider phenomenology, and, at the same time, offer a non-trivial playground to improve our theoretical tools.
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