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QCD effects in Higgs-strahlung at the LHC

English title QCD effects in Higgs-strahlung at the LHC
Applicant Gehrmann-De Ridder Aude
Number 172478
Funding scheme Project funding (Div. I-III)
Research institution Institut für Theoretische Physik ETH Zürich
Institution of higher education ETH Zurich - ETHZ
Main discipline Theoretical Physics
Start/End 01.06.2017 - 31.08.2020
Approved amount 187'732.00
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All Disciplines (2)

Discipline
Theoretical Physics
Particle Physics

Keywords (4)

Precision measurements; Higgs boson; QCD; Collider Physics

Lay Summary (German)

Lead
Titel des Forschungsprojekts:QCD-Effekte in Higgs-Strahlung am LHC1. Lead:Die gemeinsame Produktion eines Higgs Bosons und eines elektroschwachen Eichbosons (bezeichnet als Higgs-Strahlung) hat eine klare Endzustands-Signatur und ist höchstwahrscheinlich der einzige Prozess am LHC, mit dem der dominante Higgs-Boson Zerfall in Bottom-quarks untersucht werden kann.
Lay summary

2. Inhalt und Ziel des Forschungsprojekts:

Ziel dieses Projektes ist es, genaue Vorhersagen für den Higgs-Strahlung Prozess mit oder ohne hadronischen Jet im Endzustand zu berechnen.

Die detaillierten Zwecke dieses Projektes sind: (A) Die Berechnung der QCD Korrekturen der zweiten Ordnung für den Higgs-Zerfall in Bottom-quarks in der Higgs-Strahlung; (B) Die Berechnung der QCD Korrekturen der zweiten Ordnung in Produktion und Zerfall für Higgs-Strahlung mit einem hadronischen Jet; (C) Umfassende phänomenologische Studien der QCD Effekte auf spezifische Observablen im Higgs-Strahlung Prozess.

3. Wissenschaftlicher und gesellschaftlicher Kontext des Forschungsprojekts:

Unsere Arbeit wird zu einer Optimierung der künftigen experimentellen Messungen und zu einer deutlichen besseren Bestimmung von fundamentalen Parametern aus dem Higgs-Strahlung Prozess beitragen. Die in diesem Projekt erstellten Simulationsprogramme werden den LHC Experimenten zur Verfügung gestellt, wo sie ein wichtiger Beitrag zu Präzisionsstudien sein werden.

Direct link to Lay Summary Last update: 18.04.2017

Responsible applicant and co-applicants

Employees

Name Institute

Publications

Scientific events

Active participation

Title Type of contribution Title of article or contribution Date Place Persons involved
NNLOJET Collaboration meeting, Zurich, April 2019 Talk given at a conference Flavour tagging in NNLOJET 15.04.2019 Zürich, Switzerland Majer Imre;
Higgs Couplings conference, November 2018 Talk given at a conference Associated Higgs Boson Production via Flavour-Tagging in NNLOJET 26.11.2018 Tokyo, Japan Majer Imre;
HP2 conference, October 2018 Talk given at a conference LHC observables with NNLOJET 01.10.2018 Freiburg , Germany Gehrmann-De Ridder Aude;
Loops and Legs in Quantum Field Theory conference , May 2018 Talk given at a conference Jet cross sections with NNLOJET 30.04.2018 St Goar, Germany Gehrmann-De Ridder Aude;
NNLOJET Collaboration meeting, Zurich, December 2017 Talk given at a conference VH@NNLO 14.12.2017 Zürich, Switzerland Majer Imre;
CERN Theory Institute conference, June 2017 Talk given at a conference Z+ jet observables at NNLO 19.06.2017 CERN, Geneva, Switzerland Gehrmann-De Ridder Aude;


Self-organised

Title Date Place
NNLOJET Collaboration meeting, Zurich, April 2019 15.04.2019 Zürich, Switzerland
NNLOJET Collaboration meeting, Zurich, December 2017 14.12.2017 Zürich, Switzerland

Associated projects

Number Title Start Funding scheme
160814 Particle Physics with high-quality data from the CERN LHC 01.10.2015 Sinergia

Abstract

One of the most important objectives of the LHC physics programme is the understanding of the breaking of the electroweak symmetry, which in the Standard Model of particle physics is described by the Higgs mechanism. Besides forecasting the existence of the Higgs boson, which was discovered at the LHC with the first data set in 2012, this mechanism predicts the interaction strengths of the Higgs boson with all other elementary particles. With increased collision energy and luminosity in the upcoming data taking period, the LHC experiments will be able to assess for the first time a variety of processes that probe specific Higgs boson interactions. The production of a Higgs boson in association with a weak gauge boson (called Higgs-strahlung process) has a distinctive final state signature, and will very likely be the only process at the LHC that allows to assess the dominant Higgs boson decay mode to bottom quarks. This research project aims for precise predictions, including second-order QCD corrections, for the Higgs-strahlung process without and with a final state hadronic jet including the decays of the vector and Higgs bosons. It will provide fully differential predictions in the form of a parton-level Monte Carlo program that can take proper account of the details of the experimental measurements. The detailed objectives of this project are: (A) the second-order QCD corrections to the Higgs decay to bottom quarks in the Higgs-strahlung process; (B) the second-order QCD corrections (in production and decay) in the Higgs-strahlung process with an identified final-state jet; (C) detailed phenomenological studies of the impact of the QCD effects on experimentally relevant observables in Higgs-strahlung, leading to optimisation and refinement of upcoming experimental measurements and fundamental parameter extractions.
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