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Quantum Precision for the high energy phase of the Large Hadron Collider

English title Quantum Precision for the high energy phase of the Large Hadron Collider
Applicant Pozzorini Stefano
Number 157722
Funding scheme Temporary Backup Schemes
Research institution
Institution of higher education University of Zurich - ZH
Main discipline Theoretical Physics
Start/End 01.10.2015 - 30.09.2020
Approved amount 1'990'018.00
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All Disciplines (2)

Discipline
Theoretical Physics
Particle Physics

Keywords (13)

Standard Model; multi-particle processes; Top quark; Background; Electroweak interactions; Cross section; LHC; QCD; NNLO; Automation; Higgs boson; NLO; Jets

Lay Summary (Italian)

Lead
La scoperta del Bosone di Higgs al Large Hadron Collider (LHC) e' un evento straordinario, che ha aperto la strada allo studio sperimentale del fenomeno di rottura della simmetria elettrodebole, un meccanismo responsabile di aspetti fondamentali del mondo fisico, sin dall'origine dell'universo.Nei vent'anni, attraverso una vasta campagna di misure di precisione, lLHC testera' le interazioni del Bosone di Higgs con i costituenti della materia e con le particelle mediatrici delle interazioni fondamentali. Aumentando l'energia delle collisioni, LHC estendera' anche la ricerca di nuove particelle in un territorio inesplorato e ad alto potenziale di scoperta.In questo contesto, le simulazioni teoriche di urti di particelle giocano un ruolo centrale. Da un lato forniscono la base per l'interpretazione di qualsiasi misurazione sperimentale; dall'altro, le attuali incertezze teoriche rappresentano una limitazione importante per test di precisione e per la ricerca di nuove particelle.
Lay summary
La fase avanzata dell'esperimento LHC richiedera' simulazioni teoriche con un livello di precisione, flessibilita' e velocita' senza precedenti.  Al fine di raggiungere tali prerequisiti tecnici, in questo progetto verrano sviluppati e implementati nuovi algoritmi, che aumenteranno la precisione e il campo di applicabilita' delle atuali tecniche di simulazione in modo sostanziale.

I nuovi algoritmi saranno resi pubblici e, grazie all'elevato grado di flessibilita' e automazione, permetteranno uno spettro molto ampio di studi teorici, cosi come innumerevoli applicazioni nell'analisi dei dati sperimentali raccolti ad LHC.  Il risultante aumento di precisione teorica migliorera' in modo sostanziale le possibilita' di falsificare il modello standard della fisica delle particelle, sia attraverso test di precisione che nel contesto della ricerca di nuove particelle.
Direct link to Lay Summary Last update: 22.09.2015

Lay Summary (English)

Lead
The recent discovery of the Higgs boson at the Large Hadron Collider (LHC) is an event of extraordinary significance, which opened the door to the direct experimental investigation of electroweak symmetry breaking, a mechanism that shapes fundamental aspects of the physical world since the early universe.In the next two decades, the LHC will test the interactions of the Higgs boson with matter and force-carrier particles through a vast campaign of precise measurements, and will explore a new energy range with high discovery potential. In this context, theoretical simulations of particle collisions based on quantum-field theory play a central role for the sensitivity to new phenomena and for the possibility to perform precision tests.
Lay summary

The high-energy phase of the LHC experiment poses unprecedented requirements  in terms of precision, flexibility and speed of theoretical simulations of particle collisions. To meet these challenges, in this project we will develop and implement new algorithms that can advance theoretical simulations beyond the present technical frontiers.

These new algorithms will be made publicly available, and their highly automated character will allow for a very broad specturm of phenomenological studies at the LHC, as well as for countless applications to the analysis of LHC data.  The resulting gain in precision will greatly enhance the opportunities to challenge the Standard Model of particle physics, both through precision tests and new-physics searches at the LHC.

Direct link to Lay Summary Last update: 22.09.2015

Responsible applicant and co-applicants

Employees

Publications

Publication
NLO QCD+EW predictions for HV and HV+jet production including parton-shower effects
Granata Federico, Lindert Jonas M., Oleari Carlo, Pozzorini Stefano (2017), NLO QCD+EW predictions for HV and HV+jet production including parton-shower effects, in JHEP, 09, 012-012.
Four-loop renormalization of QCD with a reducible fermion representation of the gauge group: anomalous dimensions and renormalization constants
Chetyrkin K. G., Zoller M. F. (2017), Four-loop renormalization of QCD with a reducible fermion representation of the gauge group: anomalous dimensions and renormalization constants, in JHEP, 06, 074-074.
Double-real corrections at order $αα_s$ to single gauge boson production
Bonciani Roberto, Buccioni Federico, Mondini Roberto, Vicini Alessandro (2017), Double-real corrections at order $αα_s$ to single gauge boson production, in Eur. Phys. J., C77(3), 187-187.
Next-to-leading order QCD predictions for top-quark pair production with up to three jets
Höche Stefan, Maierhöfer Philipp, Moretti Niccolo, Pozzorini Stefano, Siegert Frank (2017), Next-to-leading order QCD predictions for top-quark pair production with up to three jets, in Eur. Phys. J., C77(3), 145-145.
An NLO+PS generator for $tt$ and $Wt$ production and decay including non-resonant and interference effects
Jezo Tomas, Lindert Jonas M., Nason Paolo, Oleari Carlo, Pozzorini Stefano (2016), An NLO+PS generator for $tt$ and $Wt$ production and decay including non-resonant and interference effects, in Eur. Phys. J., C76(12), 691-691.
Multijet merging for vector boson plus jets production including electroweak corrections
Kallweit Stefan, Lindert Jonas, Maierhöfer Philipp, Pozzorini Stefano, Schönherr Marek (2016), Multijet merging for vector boson plus jets production including electroweak corrections, in Proceedings, 13th DESY Workshop on Elementary Particle Physics: Loops and Legs in Quantum Field Theo, LL2016, 008-008, SISSA, Trieste LL2016, 008-008.
Four-loop QCD $β$-function with different fermion representations of the gauge group
Zoller M. F. (2016), Four-loop QCD $β$-function with different fermion representations of the gauge group, in JHEP, 10, 118-118.
NLO QCD+EW for V+jets
Schönherr Marek, Kallweit Stefan, Lindert Jonas M., Pozzorini Stefano, Maierhöfer Philipp (2016), NLO QCD+EW for V+jets, in Proceedings, 4th Large Hadron Collider Physics Conference (LHCP 2016): Lund, Sweden, June 13-18, 201, LHCP2016, 058-058, SISSA, Trieste LHCP2016, 058-058.
$WW$ production at the LHC: fiducial cross sections and distributions in NNLO QCD
Grazzini Massimiliano, Kallweit Stefan, Pozzorini Stefano, Rathlev Dirk, Wiesemann Marius (2016), $WW$ production at the LHC: fiducial cross sections and distributions in NNLO QCD, in JHEP, 08, 140-140.
Leading QCD-induced four-loop contributions to the β-function of the Higgs self-coupling in the SM and vacuum stability
Chetyrkin K. G., Zoller M. F. (2016), Leading QCD-induced four-loop contributions to the β-function of the Higgs self-coupling in the SM and vacuum stability, in JHEP, 06, 175-175.
On the renormalization of operator products: the scalar gluonic case
Zoller Max F. (2016), On the renormalization of operator products: the scalar gluonic case, in JHEP, 04, 165-165.
NLO QCD+EW predictions for V+jets including off-shell vector-boson decays and multijet merging
Kallweit Stefan, Lindert Jonas M., Maierhofer Philipp, Pozzorini Stefano, Schönherr Marek (2016), NLO QCD+EW predictions for V+jets including off-shell vector-boson decays and multijet merging, in JHEP, 04, 021-021.
Measuring the signal strength in $ttH$ with $H→bb$
Moretti Niccolo, Petrov Petar, Pozzorini Stefano, Spannowsky Michael (2016), Measuring the signal strength in $ttH$ with $H→bb$, in Phys. Rev., D93(1), 014019-014019.
Top-Yukawa effects on the $β$-function of the strong coupling in the SM at four-loop level
Zoller M. F. (2016), Top-Yukawa effects on the $β$-function of the strong coupling in the SM at four-loop level, in JHEP, 02, 095-095.

Collaboration

Group / person Country
Types of collaboration
DESY Hamburg Germany (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
CERN theory division Switzerland (Europe)
- Publication
- Exchange of personnel
Stefan Hoeche, SLAC United States of America (North America)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
Paolo Nason, Milano Bicocca University Italy (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
- Exchange of personnel
Freiburg University Germany (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
- Exchange of personnel

Scientific events

Active participation

Title Type of contribution Title of article or contribution Date Place Persons involved
Particle Theory Seminar Individual talk A new method to generate and reduce one-loop amplitudes in OpenLoops 2 04.10.2017 PSI, Villigen, Switzerland Zoller Max;
RADCOR 2017 Talk given at a conference A new method to generate and reduce one-loop amplitudes in OpenLoops 2 24.09.2017 St. Gilgen, Austria Zoller Max;
Top2017 - 10th International Workshop on Top Quark Physics Talk given at a conference Top Quark Production: modeling and tuning in Powheg 17.09.2017 Bom Jesus, Braga, Portugal Jezo Tomas;
HF production at the LHC Individual talk Off-shell WWbb production 06.09.2017 IPPP Durham, Great Britain and Northern Ireland Pozzorini Stefano;
ATLAS Higgs & B-tagging Workshop Talk given at a conference WbWb production with POWHEG BOX RES 05.09.2017 Simons Center for Geometry and Physics, Stony Brook, New York, United States of America Jezo Tomas;
13th Workshop of the LHC Higgs Cross Section Working Group Talk given at a conference ttH theory activities 14.07.2017 CERN, Geneva, Switzerland Pozzorini Stefano;
Meeting of the ttH/tH HXSWG subgroup Talk given at a conference tt+HF: theory status 06.07.2017 CERN, Geneva, Switzerland Pozzorini Stefano;
CMS week Talk given at a conference tt+HF and ttH(bb): status and ideas from theory 21.06.2017 CERN, Geneva, Switzerland Pozzorini Stefano;
LoopFest XVI Talk given at a conference Four-loop QCD renormalization group functions with different fermion 31.05.2017 Argonne National Laboratory, United States of America Zoller Max;
LoopFest XVI Talk given at a conference A new method to generate and reduce one loop amplitudes in OpenLoops 31.05.2017 Argonne National Laboratories, Illinois, United States of America Buccioni Federico;
Large Hadron Collider Physics conference Talk given at a conference QCD+EW predictions for multiboson production 15.05.2017 Shanghai Jiao Tong University, China Pozzorini Stefano;
Standard Model at the LHC 2017 Talk given at a conference Summary of electroweak sessions 02.05.2017 NIKHEF, Amsterdam, Netherlands Pozzorini Stefano;
Dark Matter at the LHC 2017 Talk given at a conference State of the Art V+jet Backgrounds for DM@LHC 03.04.2017 UC Irvine, United States of America Pozzorini Stefano;
Calcoli Analitici e Fisica di Precisione Talk given at a conference Limite Soffice di Integrali con linee Massive 15.02.2017 Universita’ degli studi di Milano, Italy Buccioni Federico;
Common tth-HXSWG meeting on tt+b-jet backgrounds to ttH(bb) Talk given at a conference Theory predictions for tt+b-jet background to ttH(bb) 06.02.2017 CERN, Geneva, Switzerland Pozzorini Stefano;
Theory Seminar Individual talk Theory simulations for multi-particle processes and applications to Top Physics 23.01.2017 CP3-Origins, Odense, Denmark Pozzorini Stefano;
Theory Seminar Individual talk NLO+PS Simulations for Top Physics with OpenLoops 18.01.2017 Freiburg University, Germany Pozzorini Stefano;
9th International Workshop on Top Quark Physics, TOP 2016 Talk given at a conference Electroweak corrections and off-shell effects in tt production and decay 19.09.2016 Olomouc, Czech Republic Pozzorini Stefano;
HP2.6, High Precision for Hard Processes Talk given at a conference Vacuum stability in the Standard Model: Towards a four-loop precision analysis 06.09.2016 ICAS-UNSAM, Buenos Aires, Argentina Zoller Max;
QCD@LHC 2016 Talk given at a conference Theory precision for ttH signals and backgrounds 22.08.2016 Zurich University and ETH, Switzerland Pozzorini Stefano;
Lecture at 2016 CTEQ & MCnet School Individual talk Electroweak Theory and Higgs Mechanism (Lecture) 06.07.2016 DESY Hamburg, Germany Pozzorini Stefano;
Particle physics seminar, DESY Zeuthen Individual talk Four-loop beta functions in the Standard Model: Leading contributions and their impact on vacuum stability 09.06.2016 DESY Zeuthen, Germany Zoller Max;
Strategy Workshop on High-Energy Particle Physics in Switzerland Talk given at a conference Theory tools for precision SM and Higgs Physics 07.06.2016 Aegerisee , Switzerland Pozzorini Stefano;
KITP Workshop “LHC Run II and the Precision Frontier” Talk given at a conference Precision for V+jets and Dibosons 23.04.2016 KITP, Santa Barbara University of California, United States of America Pozzorini Stefano;
Rencontres de Physique de la Vallee d’Aoste Talk given at a conference Recent Theoretical Progress in QCD and EW Corrections 09.03.2016 La Thuile, Italy Pozzorini Stefano;
Meeting of the German Physical Society Talk given at a conference Precision Theory Simulations for the LHC 04.03.2016 Hamburg, Germany Pozzorini Stefano;
Theory Seminar Individual talk Scattering Amplitudes and Precision Simulations for the LHC 26.01.2016 University of Vienna, Austria Pozzorini Stefano;
11th Workshop of the LHC Higgs Cross Section Working Group Talk given at a conference ttH/tH working group: status of YR4 preparation and future activities 13.01.2016 CERN, Geneva, Switzerland Pozzorini Stefano;
Theory Seminar Individual talk Scattering Amplitudes and Precision Simulations for the LHC 02.12.2015 DESY Hamburg, Germany Pozzorini Stefano;
Higgs Couplings 2015 Talk given at a conference MC for ttH and SM backgrounds 13.10.2015 Lumley Castle, Durham, Great Britain and Northern Ireland Pozzorini Stefano;


Associated projects

Number Title Start Funding scheme
153027 QCD and Electroweak Quantum Corrections at the Large Hadron Collider 01.10.2014 SNSF Professorships
141847 Particle Physics with high-quality data from the CERN LHC 01.10.2012 Sinergia

Abstract

The recent discovery of the Higgs boson at the Large Hadron Collider (LHC) is an event of extraordinary significance, which opened the door to the direct experimental investigation of electroweak symmetry breaking, a mechanism that shapes fundamental aspects of the physical world since the early universe.In the next two decades, the LHC will test the interactions of the Higgs boson with matter and force-carrier particles through a vast campaign of precise measurements, and will explore a new energy range with high discovery potential. In this context, theoretical simulations of particle collisions based on quantum-field theory play a central role for the sensitivity to new phenomena and for the possibility to perform precision tests.The high-energy phase of the LHC experiment poses unprecedented requirements in terms of precision, flexibility and speed of the theoretical simulations. To meet these challenges, in this project we will develop and implement new algorithmic approaches that can advance perturbative simulation techniques beyond the present technical frontiers. The key idea is to merge the OpenLoops method - a powerful approach that was recently introduced by the PI - with new promising ideas that are emerging in the context of algebraic geometry.At next-to-leading order (NLO) in perturbation theory, the new method will open the door to multi-particle calculations for any process with up to seven particles, while the physical content of the simulations will be enhanced by including electroweak quantum effects. Moreover, on the wave of a recent NLO revolution, the proposed approach will automate central aspects of next-to-next-to leading order (NNLO) calculations.These new algorithms will be made publicly available, interfaced to multi-purpose Monte Carlo programs, and applied to a broad range of phenomenological studies at the LHC. Thanks to their high flexibility, they will be widely applicable to the analysis of LHC data, and the resulting gain in precision will greatly enhance the opportunities to challenge the Standard Model at the LHC, both through precision tests and new-physics searches.
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