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Jet production in higher orders of perturbation theory

English title Jet production in higher orders of perturbation theory
Applicant Gehrmann Thomas
Number 162487
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 01.10.2015 - 30.09.2017
Approved amount 560'000.00
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Keywords (4)

Quantum field theory; Elementary particles; Collider physics; Perturbation theory

Lay Summary (German)

Lead
Quarks und Gluonen sind fundamentale Bausteine der Materie. Aufgrund ihrer starken Wechselwirkung können sie jedoch nicht als freie Teilchen, sondern nur in Bindungszuständen beobachtet werden. Um die Dynamik von Quarks und Gluonen zu rekonstruieren, untersucht man Vielteilchen-Endzustände an Collider-Experimenten und kombiniert diese Teilchen in Jets (Teilchencluster mit gemeinsamer Impulsrichtung). In diesem Projekt führen wir Präzisionsberechnungen von Jet-Observablen durch und wenden diese in der verbesserten Bestimmung fundamentaler Parameter der Teilchenphysik an.
Lay summary

Jet-Observablen erlauben die Rekonstruktion der Dynamik von Quarks und Gluonen in Hochenergie-Experimenten, und ermöglichen eine Vielzahl von Studien fundamentaler teilchenphysikalischer Grössen. Die präzise Vorhersage dieser Observablen wird mit störungstheoretischen Methoden ausgeführt. Um höhere Ordungen in der störungstheoretischen Entwicklung zu berechnen, sind anspruchsvolle analytische und numerische Verfahren erforderlich. Im Rahmen dieses Projektes entwickeln wir neue Zugänge zur weitgehend automatisierten Berechnung von Jet-Observablen, und wenden diese auf spezifische Prozesse an.

Hierbei konzentrieren wir uns einerseits auf Reaktionen, die eine verbesserte Vermessung der Struktur des Protons erlauben (Jet-Produktion in Proton-Proton und Elektron-Proton Kollisionen), andererseits auf seltene Prozesse bei sehr hohen Energien (Higgs-plus-Jet Produktion), welche für die Bestimmung der Kopplungen des Higgs-Bosons von Bedeutung sind.

Direct link to Lay Summary Last update: 22.10.2015

Responsible applicant and co-applicants

Employees

Publications

Publication
Precise predictions for dijet production at the LHC
Currie James, Gehrmann-De Ridder Aude, Gehrmann Thomas, Glover E. W. N., Huss Alexander, Pires Joao (2017), Precise predictions for dijet production at the LHC, in Phys. Rev. Lett., (15), 152001.
Determination of the strong coupling constant $α_s(M_Z)$ in next-to-next-to-leading order QCD using H1 jet cross section measurements
Andreev V., others (2017), Determination of the strong coupling constant $α_s(M_Z)$ in next-to-next-to-leading order QCD using H1 jet cross section measurements, in Eur.Phys.J. C, 77, 791.
Handbook of LHC Higgs Cross Sections: 4. Deciphering the Nature of the Higgs Sector
de Florian Daniel et al. (376 authors), Gehrmann Thomas, Karlberg Alexander (2017), Handbook of LHC Higgs Cross Sections: 4. Deciphering the Nature of the Higgs Sector, CERN, Geneva.
NNLO QCD corrections to event orientation in e+e- annihilation
Gehrmann Thomas, Glover Nigel, Huss Alexander, Niehues Jan, Zhang Hantian (2017), NNLO QCD corrections to event orientation in e+e- annihilation, in Phys. Lett. B, 775, 185.
NNLO QCD corrections to jet production in deep inelastic scattering
Currie James, Gehrmann Thomas, Huss Alexander, Niehues Jan (2017), NNLO QCD corrections to jet production in deep inelastic scattering, in JHEP, 018-018.
Precise predictions for the angular coefficients in Z-boson production at the LHC
Gauld R., Gehrmann-De Ridder A., Gehrmann T., Glover E. W. N., Huss A. (2017), Precise predictions for the angular coefficients in Z-boson production at the LHC, in JHEP, 11, 003.
Resummation of jet rates and event-shape distributions in $e^+ e^−$
Gehrmann Thomas, Luisoni Gionata, Monni Pier Francesco (2017), Resummation of jet rates and event-shape distributions in $e^+ e^−$, in Proceedings, Parton Radiation and Fragmentation from LHC to FCC-ee: CERN, Geneva, Switzerland, Novem, 97-102, CERN, Geneva97-102.
Single Jet Inclusive Production for the Individual Jet $p_{\rm T}$ Scale Choice at the LHC
Currie James, Glover E. W. N., Gehrmann Thomas, Gehrmann-De Ridder Aude, Huss Alexander, Pires Joao (2017), Single Jet Inclusive Production for the Individual Jet $p_{\rm T}$ Scale Choice at the LHC, in Proceedings, 23rd Cracow Epiphany Conference on Particle Theory Meets the First Data from LHC Run 2:, 955-967, Acta Physica Polonica, Cracow955-967.
Standard Model processes
Mangano M. et al (76 authors), Cieri Leandro, Karlberg Alexander (2017), Standard Model processes, in Mangano M. (ed.), CERN, Geneva, 1.
The forward-backward asymmetry for massive bottom quarks at the $Z$ peak at next-to-next-to-leading order QCD
Bernreuther Werner, Chen Long, Dekkers Oliver, Gehrmann Thomas, Heisler Dennis (2017), The forward-backward asymmetry for massive bottom quarks at the $Z$ peak at next-to-next-to-leading order QCD, in JHEP, 053-053.
Transverse-momentum resummation for the signal-background interference in the H→γγ channel at the LHC
Cieri Leandro, Coradeschi Francesco, de Florian Daniel, Fidanza Nerina (2017), Transverse-momentum resummation for the signal-background interference in the H→γγ channel at the LHC, in Phys. Rev., (5), 054003-054003.
Erratum: Analytic Form of the Two-Loop Planar Five-Gluon All-Plus-Helicity Amplitude in QCD [Phys. Rev. Lett. 116 , 062001 (2016)]
Gehrmann T., Henn J. M., Lo Presti N. A. (2016), Erratum: Analytic Form of the Two-Loop Planar Five-Gluon All-Plus-Helicity Amplitude in QCD [Phys. Rev. Lett. 116 , 062001 (2016)], in Physical Review Letters, 116(18), 189903-189903.
Advances in QCD predictions
Gehrmann Thomas (2016), Advances in QCD predictions, in Proceedings, 24th International Workshop on Deep-Inelastic Scattering and Related Subjects (DIS 2016, 003-003, PoS, Trieste003-003.
Analytic form of the two-loop planar five-gluon all-plus-helicity amplitude in QCD
Gehrmann T., Henn J. M., Lo Presti N. A. (2016), Analytic form of the two-loop planar five-gluon all-plus-helicity amplitude in QCD, in Phys. Rev. Lett., (6), 062001-062001.
CP-even scalar boson production via gluon fusion at the LHC
Anastasiou Charalampos, Duhr Claude, Dulat Falko, Furlan Elisabetta, Gehrmann Thomas, Herzog Franz, Lazopoulos Achilleas, Mistlberger Bernhard (2016), CP-even scalar boson production via gluon fusion at the LHC, in JHEP, 037-037.
Generalized threshold resummation in inclusive DIS and semi-inclusive electron-positron annihilation
Almasy A. A., Lo Presti N. A., Vogt A. (2016), Generalized threshold resummation in inclusive DIS and semi-inclusive electron-positron annihilation, in JHEP, 028-028.
Higgs plus one jet production at NNLO
Chen Xuan, Gehrmann Thomas, Glover Nigel, Jaquier Matthieu (2016), Higgs plus one jet production at NNLO, in Proceedings, 12th International Symposium on Radiative Corrections (Radcor 2015) and LoopFest XIV (R, 056-056, PoS, Trieste056-056.
High precision determination of the gluon fusion Higgs boson cross-section at the LHC
Anastasiou Charalampos, Duhr Claude, Dulat Falko, Furlan Elisabetta, Gehrmann Thomas, Herzog Franz, Lazopoulos Achilleas, Mistlberger Bernhard (2016), High precision determination of the gluon fusion Higgs boson cross-section at the LHC, in JHEP, 058-058.
NNLO dijet production in DIS with the antenna subtraction method
Niehues Jan, Currie James, Gehrmann Thomas (2016), NNLO dijet production in DIS with the antenna subtraction method, in Proceedings, 13th DESY Workshop on Elementary Particle Physics: Loops and Legs in Quantum Field Theo, 055-055, PoS, Trieste055-055.
NNLO QCD corrections for $Z$ boson plus jet production
Gehrmann-De Ridder Aude, Gehrmann Thomas, Glover Nigel, Huss Alexander, Morgan Thomas A. (2016), NNLO QCD corrections for $Z$ boson plus jet production, in Proceedings, 12th International Symposium on Radiative Corrections (Radcor 2015) and LoopFest XIV (R, 075-075, PoS, Trieste075-075.
NNLO QCD corrections for Drell-Yan $p_T^Z$ and $ϕ^*$ observables at the LHC
Gehrmann-De Ridder A., Gehrmann T., Glover E. W. N., Huss A., Morgan T. A. (2016), NNLO QCD corrections for Drell-Yan $p_T^Z$ and $ϕ^*$ observables at the LHC, in JHEP, 094-094.
NNLO QCD corrections to Higgs boson production at large transverse momentum
Chen X., Cruz-Martinez J., Gehrmann T., Glover E. W. N., Jaquier M. (2016), NNLO QCD corrections to Higgs boson production at large transverse momentum, in JHEP, 066-066.
Precise QCD predictions for the production of dijet final states in deep inelastic scattering
Currie James, Gehrmann Thomas, Niehues Jan (2016), Precise QCD predictions for the production of dijet final states in deep inelastic scattering, in Phys. Rev. Lett., (4), 042001-042001.
The NNLO QCD corrections to Z boson production at large transverse momentum
Gehrmann-De Ridder Aude, Gehrmann T., Glover E. W. N., Huss A., Morgan T. A. (2016), The NNLO QCD corrections to Z boson production at large transverse momentum, in JHEP, 133-133.
Two-loop five-point integrals in massless QCD
Lo Presti Nicola Adriano, Gehrmann Thomas, Henn Johannes (2016), Two-loop five-point integrals in massless QCD, in Proceedings, 13th DESY Workshop on Elementary Particle Physics: Loops and Legs in Quantum Field Theo, 051-051, PoS, Trieste051-051.
Two-loop QCD corrections to vector boson pair production at the LHC
Tancredi Lorenzo, Gehrmann Thomas, von Manteuffel Andreas (2016), Two-loop QCD corrections to vector boson pair production at the LHC, in Proceedings, 12th International Symposium on Radiative Corrections (Radcor 2015) and LoopFest XIV (R, 025-025, PoS, Trieste025-025.
Z+jet production at NNLO
Gehrmann-De Ridder A., Gehrmann T., Glover E. W. N., Huss Alexander, Morgan T. A. (2016), Z+jet production at NNLO, in Proceedings, 38th International Conference on High Energy Physics (ICHEP 2016): Chicago, IL, USA, Au, 594-594, PoS, Trieste594-594.
Z+jet production at NNLO
Gehrmann-De Ridder A., Gehrmann T., Glover E. W. N., Huss A., Morgan T. A. (2016), Z+jet production at NNLO, in Proceedings, 13th DESY Workshop on Elementary Particle Physics: Loops and Legs in Quantum Field Theo, 056-056, PoS, Trieste056-056.
Pseudo-scalar Form Factors at Three Loops in QCD
Ahmed Taushif, Gehrmann Thomas, Mathews Prakash, Rana Narayan, Ravindran V. (2015), Pseudo-scalar Form Factors at Three Loops in QCD, in JHEP, 169-169.
The rare decay $H \rightarrow Z gamma$ in perturbative QCD
Kara Dominik (2015), The rare decay $H \rightarrow Z gamma$ in perturbative QCD, in Proceedings, 12th International Symposium on Radiative Corrections (Radcor 2015) and LoopFest XIV (R, 010-010, PoS, Trieste010-010.

Collaboration

Group / person Country
Types of collaboration
Prof. J. Henn, Univ. Mainz Germany (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
- Exchange of personnel
Dr. G. Heinrich, MPI Munich Germany (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
- Exchange of personnel
Prof. A. Gehrmann-De Ridder, ETH Zuerich Switzerland (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
Prof. E.W.N. Glover, Univ. Durham Great Britain and Northern Ireland (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
RADCOR 2017 Talk given at a conference Jet cross sections and transverse momentum distributions with NNLOJET 25.09.2017 St. Gilgen, Austria Gehrmann Thomas;
ATLAS Standard Model Workshop Talk given at a conference News on NNLO photon production 19.09.2017 Thessaloniki, Greece Cieri Leandro;
13th Workshop of the LHC Higgs Cross Section Working Group Talk given at a conference Report from Working Group 1: Vector Boson Fusion 14.07.2017 Geneva, Switzerland Karlberg Alexander;
Gordon Research Conference in Particle Physics Talk given at a conference Fixed order predictions for precision observables 25.06.2017 Hong Kong, Hongkong Gehrmann Thomas;
LHC Higgs Cross Section Working Group meeting Talk given at a conference Central jet veto and parton showers in VBF 15.06.2017 Geneva, Switzerland Karlberg Alexander;
Rencontres de Moriond: QCD and High Energy Interactions Talk given at a conference Precise QCD predictions for the production of dijet final states in deep inelastic scattering 25.03.2017 La Thuile, Italy Niehues Jan;
Teilchenphysik-Seminar Individual talk Precision Physics with Jet Observables 16.03.2017 Tuebingen, Germany Gehrmann Thomas;
Vienna Central European Seminar Talk given at a conference Standard Model Theory for the LHC 01.12.2016 Wien, Austria Gehrmann Thomas;
Physics at the Terascale Talk given at a conference DIS dijets @ NNLO 21.11.2016 Hamburg, Germany Niehues Jan;
Teilchenphysik-Seminar Individual talk VBF Higgs production at NNLO ... and beyond 17.11.2016 Tuebingen, Germany Karlberg Alexander;
Higgs Couplings 2016 Talk given at a conference Higgs Production through Gluon Fusion 09.11.2016 Palo Alto, United States of America Gehrmann Thomas;
Future Challenges in Precision QCD Talk given at a conference VBF Higgs production in the structure function approach and beyond 25.10.2016 Durham, Great Britain and Northern Ireland Karlberg Alexander;
Effective Field Theories for Collider Physics Talk given at a conference Transverse momentum distributions and jet cross sections at NNLO precision 13.09.2016 Eltville, Germany Gehrmann Thomas;
High Precision for Hard Processes Talk given at a conference NNLO dijet production in DIS with the antenna subtraction method 06.09.2016 Buenos Aires, Argentina Niehues Jan;
Higgs Hunting 2017 Talk given at a conference proVFBH: An NNLO Monte Carlo generator for VBF Higgs production 26.07.2016 Orsay, France Karlberg Alexander;
Loops and Legs in Quantum Field Theory Talk given at a conference Two-loop five-point integrals in massless QCD 28.04.2016 Leipzig, Germany Lo Presti Nicola Adriano;
Loops and Legs in Quantum Field Theory Talk given at a conference NNLO dijet production in DIS with the antenna subtraction method 24.04.2016 Leipzig, Germany Niehues Jan;
International Workshop on Deep Inelastic Scattering and QCD Talk given at a conference Status of Higher Order QCD Calculations 11.04.2016 Hamburg, Germany Gehrmann Thomas;
MITP Workshop on New Ideas for Loop Amplitudes Talk given at a conference Amplitude reduction techniques 29.02.2016 Mainz, Germany Gehrmann Thomas;
Threshold Logarithms Beyond Leading Power Talk given at a conference Generalized threshold resummation for inclusive QCD processes 27.01.2016 Edinburgh, Great Britain and Northern Ireland Lo Presti Nicola Adriano;
Physik-Kolloquium Individual talk Precision Physics with Jet Observables 12.11.2015 Wuerzburg, Germany Gehrmann Thomas;
Future Challenges in Precision QCD Talk given at a conference Transverse momentum distributions and jet cross sections at NNLO precision 25.10.2015 Durham, Great Britain and Northern Ireland Gehrmann Thomas;
School of Analytic Computing in Theoretical High Energy Physics Talk given at a conference Lectures on Subtraction Methods 11.10.2015 Atrani, Italy Gehrmann Thomas;


Self-organised

Title Date Place
Zurich Phenomenology Workshop 2017 09.01.2017 Zurich, Switzerland
QCD@LHC2016 22.08.2016 Zurich, Switzerland
Zurich Phenomenology Workshop 2016 06.01.2016 Zurich, Switzerland

Associated projects

Number Title Start Funding scheme
149517 Jet production in higher orders of perturbation theory 01.10.2013 Project funding
173357 Probing the Higgs sector at the LHC and beyond 01.05.2018 Argentina (AJRP)
175595 Precision Theory for High-Energy Collider Physics 01.10.2017 Project funding
160814 Particle Physics with high-quality data from the CERN LHC 01.10.2015 Sinergia

Abstract

Jet cross sections and multi-particle production are among the most important observables studied at current and future experiments in high energy physics. Their measurement enables the determination of fundamental parameters of the Standard Model theory of particle physics. The theoretical description of these observables is usually restricted to the next-to-leading order in perturbation theory; the resulting theoretical uncertainty is by now insufficient to match the current experimental precision. The proposed project aims to develop and automate new methods for the calculation of jet and multi-particle cross sections in higher orders of perturbation theory, and to apply these methods in actual computations. The computation of higher orders in perturbation theory goes through the evaluation of all field theoretic subprocesses contributing to the observable under consideration. Although the sum of all these subprocesses yields a finite result for suitably defined observables, individual subprocesses contain infinities due to the exchange of low-momentum particles (infrared singularities) or high-momentum particles (ultraviolet singularities). In general, the presence of these singularities forbids a direct numerical evaluation of higher order corrections. To compute jet observables in higher perturbative orders, one devises procedures to analytically extract especially the infrared singularities from each subprocess. Only after carrying out this infrared separation, it is possible to add together different subprocesses in order to obtain predictions for experimentally measured jet observables, which is made using a flexible numerical programme, a so-called parton level event generator. The current state of the art in the theoretical description of jet observables are calculations to the next-to-leading order (NLO) in perturbation theory. Calculations of jet observables at NNLO are at present available only for three-jet production in electron-positron collisions. Proof-of-principle implementations of NNLO corrections for various jet observables at hadron colliders have been performed recently. The project proposed here aims to contribute to the following aspects of precision physics at high energy particle colliders: (a) development of a framework for the automated generation of code components for NNLO parton-level event generator programs; (b) application of these tools to the calculation of NNLO corrections to jet production in hadron-hadron collisions and di-jet production in deep inelastic scattering; (c) computation of mass corrections in Higgs-boson-plus-jet production to NLO; (d) computation of the two-loop QCD corrections to 2->3 massless parton scattering processes; (e) development of a new method for the calculation of multi-loop multi-scale integrals.
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