# Project

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## Particle Physics with high-quality data from the CERN LHC

 Applicant Gehrmann Thomas 141847 Sinergia Institut für Theoretische Physik Universität Zürich University of Zurich - ZH Particle Physics 01.10.2012 - 30.09.2015 1'600'000.00
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### Keywords (1)

Elementary Particles

### Lay Summary (English)

Lay summary
At present, the CERN LHC is recording an important set of proton-proton collision data at a collision energy of 7 TeV. This data-set will allow many precision measurements of Standard Model benchmark processes, it will provide sensitivity to a discovery of the Higgs boson, which is postulated to
accommodate particle masses in the symmetry structure of the Standard Model, and it is sufficient to perform searches for new particles up to energy scales about three times as large as were accessible at previous colliders. After the end of this data taking period, an energy upgrade is foreseen to double the LHC collision energy. The performance of the CERN LHC and its detectors produces a large data-set of very high quality.

To analyze and interpret the data from the 7 TeV LHC run, and to prepare physics studies for the 14 TeV LHC run, a close collaboration between the experiment and theory is mandatory. Simulation tools based on theory predictions are omnipresent in all aspects of the experimental measurements, and their further development is continuously ongoing. Precision measurements of Standard Model parameters require highly accurate theoretical input to relate the observed cross sections and distributions to the theory parameters. Searches for the Higgs boson and for new particles beyond the Standard Model rely on an intricate separation of potential signals from Standard Model background processes, which both need to be predicted to high precision. The Sinergia project we propose will combine the spectrum of skills of the Swiss particle theory groups in view of an optimal exploitation of the CERN LHC data. In close interaction with the experimental groups, we plan to perform calculations of immediate relevance to ongoing and newly proposed experimental data analyses, and aim to identify new observables of high physics impact.

In this project, we address the four types of observables at the LHC:
1. The study of electroweak vector boson (W, Z) production, including perturbative corrections and resummation, especially in view of preparing a precise measurement of the W-boson mass at the LHC. 2. The study of hadronic final states (event shapes and jet cross sections) at the LHC, in view of precision studies of QCD and of the improvement and tuning of event generators. 3. The study of the production of top quark pairs in association with a high-mass system in view of measuring the top quark couplings to gauge bosons and the Higgs boson. 4. The study of Higgs boson production in view of the determination of Higgs boson properties and of establishing the Higgs mechanism of electroweak symmetry breaking.

For each of these classes of observables, we plan a broad program of improvements to the theoretical predictions, which coordinates closely with the demands of the corresponding experimental studies. The different subprojects will mutually benefit from each other by exchange of techniques and results. Our work will contribute to sharpen our understanding of elementary particle physics at the Terascale and beyond, which may provide a guide towards a unified theory of fundamental particles and interactions.
 Direct link to Lay Summary Last update: 21.02.2013

### Responsible applicant and co-applicants

Name Institute
 Gehrmann Thomas Physik-Institut Universität Zürich
 Frixione Stefano Division de Physique Théorique Département de Physique CERN - PH - TH
 Anastasiou Charalampos Institut für Theoretische Physik ETH Zürich
 Dissertori Günther Institut für Teilchen- und Astrophysik ETH Zürich
 Grazzini Massimiliano Institut für Theoretische Physik Universität Zürich
 Rattazzi Riccardo Institut de physique EPFL - SB - IPHYS
 Pozzorini Stefano Institut für Theoretische Physik Universität Zürich
 Becher Thomas Institut für Theoretische Physik Universität Bern
 Gehrmann-De Ridder Aude Institut für Theoretische Physik ETH Zürich
 Wallny Rainer Institut für Teilchen- und Astrophysik ETH Zürich

### Employees

Name Institute
 Garcia Tormo Xavier Institut für Theoretische Physik Universität Bern
 Tancredi Lorenzo Département de Physique CERN - PH
 Chen Xuan Physik-Institut Universität Zürich
 Mahbubani Rakhi Nandalal Laboratoire de physique théorique des particules EPFL - SB - ITP - LPTP
 Lowdon Peter SLAC National Accelerator Laboratory

### Publications

Publication
Khachatryan Vardan, others (2016), Measurement of differential cross sections for Higgs boson production in the diphoton decay channel in pp collisions at $\sqrts=8 \text {TeV}$, in Eur. Phys. J., C76(1), 13-13.
Khachatryan Vardan, others (2016), Measurement of the ${{\mathrmW }^{+} }\mathrmW^{-}$ cross section in pp collisions at $\sqrts =$ 8 TeV and limits on anomalous gauge couplings, in Eur. Phys. J., C76(7), 401-401.
Gehrmann-De Ridder A., Gehrmann T., Glover E. W. N., Huss A., Morgan T. A. (2016), Precise QCD predictions for the production of a Z boson in association with a hadronic jet, in Phys. Rev. Lett., 117(2), 022001-022001.
Becher Thomas, Garcia i Tormo Xavier (2015), Addendum: Electroweak Sudakov effects in W, Z and gamma production at large transverse momentum, in Phys. Rev., D92(7), 073011-073011.
Khachatryan Vardan, others (2015), Comparison of the Z/$γ$$^{∗}$ + jets to $γ$ + jets cross sections in pp collisions at $\sqrts=8$ TeV, in JHEP, 10, 128-128.
Becher Thomas, Garcia i Tormo Xavier (2015), Factorization and resummation for transverse thrust, in JHEP, 06, 071-071.
Bordone Marzia, Greljo Admir, Isidori Gino, Marzocca David, Pattori Andrea (2015), Higgs Pseudo Observables and Radiative Corrections, in Eur. Phys. J., C75(8), 385-385.
CMS Collaboration (2015), Search for a Standard Model Higgs Boson Produced in Association with a Top-Quark Pair and Decaying to Bottom Quarks Using a Matrix Element Method, in Eur.Phys.J. C, 75, 251.
Lowdon Peter (2015), Spectral density constraints in quantum field theory, in Phys. Rev., D92(4), 045023-045023.
Bonciani Roberto, Catani Stefano, Grazzini Massimiliano, Sargsyan Hayk, Torre Alessandro (2015), The $q_T$ subtraction method for top quark production at hadron colliders, in Eur. Phys. J., C75(12), 581-581.
Grazzini Massimiliano, Kallweit Stefan, Rathlev Dirk, Wiesemann Marius (2015), Transverse-momentum resummation for vector-boson pair production at NNLL+NNLO, in JHEP, 08, 154-154.
Grazzini Massimiliano, Kallweit Stefan, Rathlev Dirk (2015), Wγ and Zγ production at the LHC in NNLO QCD, in JHEP, 07, 085-085.
Grazzini Massimiliano, Kallweit Stefan, Rathlev Dirk (2015), ZZ production at the LHC: fiducial cross sections and distributions in NNLO QCD, in Phys. Lett., B750, 407-410.
Gehrmann T., Grazzini M., Kallweit S., Maierhöfer P., von Manteuffel A., Pozzorini S., Rathlev D., Tancredi L. (2014), $W^+W^-$ Production at Hadron Colliders in Next to Next to Leading Order QCD, in Phys. Rev. Lett., 113(21), 212001-212001.
Grazzini Massimiliano, Kallweit Stefan, Rathlev Dirk, Torre Alessandro (2014), $Zγ$ production at hadron colliders in NNLO QCD, in Phys. Lett., B731, 204-207.
Cascioli F., Kallweit S., Maierhöfer P., Pozzorini S. (2014), A unified NLO description of top-pair and associated Wt production, in Eur. Phys. J., C74(3), 2783-2783.
Wulzer Andrea (2014), An Equivalent Gauge and the Equivalence Theorem, in Nucl. Phys., B885, 97-126.
Lowdon Peter (2014), Boundary terms in quantum field theory and the spin structure of QCD, in Nucl. Phys., B889, 801-816.
Bazavov Alexei, Brambilla Nora, Garcia i Tormo Xavier, Petreczky Peter, Soto Joan, others (2014), Determination of αlpha_s from the QCD static energy: an update, in Physical Review D, 90, 074038.
Pappadopulo Duccio, Thamm Andrea, Torre Riccardo, Wulzer Andrea (2014), Heavy Vector Triplets: Bridging Theory and Data, in JHEP, 1409, 060-060.
Moch S., Weinzierl S., Alekhin S., Blumlein J., de la Cruz L. (2014), High precision fundamental constants at the TeV scale, in High precision fundamental constants at the TeV scale, MITP, Mainz.
Butterworth J., Dissertori G., Dittmaier S., de Florian D., Glover N., others (2014), Les Houches 2013: Physics at TeV Colliders: Standard Model Working Group Report, in Les Houches 2013: Physics at TeV Colliders, EDS, Paris.
Garcia i Tormo Xavier (2014), Low-energy constraints to alpha_s, in Proceedings of the 13th International Conference on Meson-Nucleon Physics and the Structure of the N, Springer, Heidelberg.
Czarnecki Andrzej, Dowling Matthew, Garcia i Tormo Xavier, Marciano William J., Szafron Robert (2014), Michel decay spectrum for a muon bound to a nucleus, in Physical Review D, 90, 093002.
Maierhoefer P., Cascioli F., Hoeche S., KRAUSS F., Moretti N., others (2014), Next-to-leading order simulations with Sherpa+OpenLoops, in RADCOR 2013, SISSA, Trieste.
Khachatryan Vardan, others (2014), Observation of the diphoton decay of the Higgs boson and measurement of its properties, in Eur. Phys. J., C74(10), 3076-3076.
Matsedonskyi Oleksii, Panico Giuliano, Wulzer Andrea (2014), On the Interpretation of Top Partners Searches, in JHEP, 12, 097-097.
Brambilla N., Eidelman S., Foka P., Gardner S., Kronfeld A.S., Garcia i Tormo X. (2014), QCD and Strongly Coupled Gauge Theories: Challenges and Perspectives, in European Physical Journal C, 74, 2981.
Becher Thomas, Bell Guido, Lorentzen Christian, Marti Stefanie (2014), Transverse-momentum spectra of electroweak bosons near threshold at NNLO, in JHEP, 02(004), 1-33.
Cascioli F., Gehrmann T., Grazzini M., Kallweit S., Maierhöfer P., others (2014), ZZ production at hadron colliders in NNLO QCD, in Phys.Lett., B735, 311-313.
De Simone Andrea, Matsedonskyi Oleksii, Rattazzi Riccardo, Wulzer Andrea (2013), A First Top Partner Hunter's Guide, in JHEP, 1304, 004-004.
Becher Thomas, Garcia i Tormo Xavier (2013), Electroweak Sudakov effects in W, Z and gamma production at large transverse momentum, in Phys.Rev., D88, 013009-013009.
Chatrchyan Serguei, others (2013), Event shapes and azimuthal correlations in $Z$ + jets events in $pp$ collisions at $\sqrts=7$ TeV, in Phys.Lett., B722, 238-261.
CMS Collaboration (2013), Event shapes and azimuthal correlations in Z + jets events in pp collisions at sqrt(s) =7 TeV, in Phys.Lett. B, 722, 238.
Garcia i Tormo Xavier (2013), Review on the determination of αlpha_s from the QCD static energy, in Mod.Phys.Lett., A28, 1330028-1330028.
Giordano Matteo, Meggiolaro Enrico, Moretti Niccolò (2013), Wilson-loop correlators on the lattice and asymptotic behaviour of hadronic total cross sections, in EDS Blois 2013, EDS, Paris.
Lowdon Peter, Non-manifest symmetries in quantum field theory, in Nucl. Phys..

### Collaboration

Group / person Country
Types of collaboration
 - in-depth/constructive exchanges on approaches, methods or results- Publication- Exchange of personnel
 Univ. Mainz Germany (Europe)
 - in-depth/constructive exchanges on approaches, methods or results- Publication- Exchange of personnel
 Univ. Buenos Aires Argentina (South America)
 - in-depth/constructive exchanges on approaches, methods or results- Exchange of personnel
 CMS experiment Switzerland (Europe)
 - in-depth/constructive exchanges on approaches, methods or results- Publication- Research Infrastructure
 Univ. Firenze and INFN Firenze Italy (Europe)
 - in-depth/constructive exchanges on approaches, methods or results- Exchange of personnel
 Univ. Durham Great Britain and Northern Ireland (Europe)
 - in-depth/constructive exchanges on approaches, methods or results- Exchange of personnel

### Scientific events

#### Active participation

Title Type of contribution Title of article or contribution Date Place Persons involved
 FCC-ee Workshop, CERN Talk given at a conference Higgs Physics at the HL-LHC and complementarity to FCC-ee 24.09.2015 Geneva, Switzerland Bianchini Lorenzo;
 International Conference on LHC Physics LHCP2015 Talk given at a conference Searches and measurements of Higgs bosons in association with Heavy Flavours and Higgs boson decays into Heavy Flavours 31.08.2015 St. Petersburg, Russia Bianchini Lorenzo;
 Fundamental Parameters from Lattice QCD Talk given at a conference Determination of alpha_s from the QCD static energy 31.08.2015 Mainz, Germany Garcia Tormo Xavier;
 Seminar in Particle Physics, Georg-August-Universitaet Goettingen Individual talk Search for ttH events in the H to bb final state using the Matrix Element Method 29.05.2015 Goettingen, Germany Bianchini Lorenzo;
 HL-LHC Workshop, CERN Talk given at a conference Challenging channels at the HL-LHC: VH(bb), ttH(bb), H(tautau) 11.05.2015 Geneva, Switzerland Bianchini Lorenzo;
 Seminar in Particle and Astro Physics Individual talk Associated top-Higgs production with the matrix element method 22.04.2015 Zurich, Switzerland Bianchini Lorenzo;
 International Conference on Computing in High Energy and Nuclear Physics CHEP2015 Talk given at a conference Matrix element method for high performance computing platforms 13.04.2015 Okinawa, Japan Bianchini Lorenzo;
 GDR@Terascale Workshop Talk given at a conference Search for ttH events using the Matrix Element Method 11.12.2014 Heidelberg, Germany Bianchini Lorenzo;
 Quarkonium 2014 Talk given at a conference Update on the determination of alpha_s from the QCD static energy 10.11.2014 CERN, Genf, Switzerland Garcia Tormo Xavier;
 ICHEP 2014, 37th International Conference on High Energy Physics Talk given at a conference Measurement of photon and diphoton production processes at CMS 02.07.2014 Valencia, Spain Marini Andrea;
 37th International Conference on High Energy Physics ICHEP2014 Talk given at a conference Search for Higgs bosons produced in association with top quarks in the CMS detector 02.07.2014 Valencia, Spain Bianchini Lorenzo;
 ICHEP 2014, 37th International Conference on High Energy Physics Poster Z+jets/photon+jets cross section ratio at 8 TeV 02.07.2014 Valencia, Spain Marini Andrea;
 LoopFest 2014 Talk given at a conference Gauge boson pair production at NNLO / New developements on OpenLoops 16.06.2014 New York, United States of America Pozzorini Stefano; Rathlev Dirk;
 XIth Annual Workshop on Soft-Collinear Effective Theory (SCET 2014) Talk given at a conference Factorization and resummation for transverse thrust 26.03.2014 München, Germany Garcia Tormo Xavier;
 Zurich Phenomenology Workshop ZPW2014 Talk given at a conference Search for ttH using the Matrix Element Method 08.01.2014 Zurich, Switzerland Bianchini Lorenzo;
 13th International Conference on Meson-Nucleon Physics and the Structure of the Nucleon (MENU 2013) Talk given at a conference Low-energy constraints to alpha_s 30.09.2013 Rom, Italy Garcia Tormo Xavier;
 RADCOR2013 Talk given at a conference NNLO corrections to Zgamma production/Results from OpenLoops 23.09.2013 Durham, Great Britain and Northern Ireland Rathlev Dirk; Becher Thomas; Pozzorini Stefano; Gehrmann Thomas;
 QCD@LHC Talk given at a conference Jet reconstruction and performance including the non-perturbative effects in jets at the CMS 02.09.2013 Hamburg, Germany Marini Andrea;
 QCD@LHC 2013 Talk given at a conference Jet reconstruction at CMS 02.09.2013 Hamburg, Germany Marini Andrea;
 Higgs Hunting 2013 Talk given at a conference Higgs to taus in CMS 25.07.2013 Paris, France Bianchini Lorenzo;
 9th International Workshop on Heavy Quarkonium (QWG 2013) Talk given at a conference Alpha_s from the QCD static energy on the lattice 22.04.2013 IHEP, Beijing, China Garcia Tormo Xavier;
 Xth Workshop on Soft-Collinear Effective Theory (SCET 2013) Talk given at a conference Update on resummation for gamma, W- and Z- boson production at large p_T 14.03.2013 Duke University, Durham, United States of America Garcia Tormo Xavier;
 Lake Louise Winter Institute Talk given at a conference Jet production in association with vector bosons in CMS 19.02.2013 Lake Louise, Canada Marini Andrea;
 Lake Louise Winter Institute Talk given at a conference Jet production in association with vector bosons at CMS 19.02.2013 Lake Louise, Canada Marini Andrea;

#### Self-organised

Title Date Place
 Sinergia Project Meeting 09.09.2014 Bern, Switzerland
 Sinergia Project Meeting 19.09.2013 Zurich, Switzerland
 Latsis Symposium 03.06.2013 Zurich, Switzerland

### Associated projects

Number Title Start Funding scheme
 139192 Computing multi-particle production processes at LHC 01.03.2012 SNSF Professorships
 149517 Jet production in higher orders of perturbation theory 01.10.2013 Project funding
 128552 QCD quantum corrections at the Large Hadron Collider 01.10.2010 SNSF Professorships
 162665 Physics at 13 TeV with the CMS experiment at the LHC 01.10.2015 Project funding
 160814 Particle Physics with high-quality data from the CERN LHC 01.10.2015 Sinergia
 153664 Measurements of Higgs boson properties and Searches for Supersymmetry with CMS 01.04.2014 Project funding
 156585 Standard Model and Higgs Physics at the LHC 01.10.2014 Project funding
 135134 FORCE Request: Operations and Upgrades of the Barrel Pixel Detector and the Electromagnetic Calorimeter of the CMS experiment at the LHC 01.06.2011 FORCE / CERN
 138111 Search for New Physics with the CMS experiment at LHC 01.10.2011 Project funding
 135101 Two-loop corrections to vector boson pair production at CERN LHC 01.04.2011 ProDoc
 166294 Characterization of the Higgs Boson and Searches for Supersymmetry with CMS 01.04.2016 Project funding
 153027 QCD and Electroweak Quantum Corrections at the Large Hadron Collider 01.10.2014 SNSF Professorships
 157722 Quantum Precision for the high energy phase of the Large Hadron Collider 01.10.2015 SNSF Consolidator Grants
 138206 Jet production in higher orders of perturbation theory 01.10.2011 Project funding
 127462 First data analysis with the CMS detector at the LHC 01.10.2009 ProDoc
 134623 FORCE - Support for CMS Tier-3 Analysis Facility 01.04.2011 FORCE / CERN
 134939 High pT Physics with CMS and Upgrades of the CMS Barrel Pixel Detector 01.04.2011 Project funding
 149870 Physics at 13-14 TeV with the CMS experiment at the LHC 01.10.2013 Project funding
 150060 Quantum Field Theory Across the Energy Frontier 01.12.2013 Project funding

### Abstract

At present, the CERN LHC is recording an important set of proton-proton collision data at a collision energy of 7 TeV. This data-set will allow many precision measurements of Standard Model benchmark processes, it will provide sensitivity to a discovery of the Higgs boson, which is postulated to accommodate particle masses in the symmetry structure of the Standard Model, and it is sufficient to perform searches for new particles up to energy scales about three times as large as were accessible at previous colliders. After the end of this data taking period, an energy upgrade is foreseen to double the LHC collision energy. The performance of the CERN LHC and its detectors produces a large data-set of very high quality. To analyze and interpret the data from the 7 TeV LHC run, and to prepare physics studies for the 14 TeV LHC run, a close collaboration between the experiment and theory is mandatory. Simulation tools based on theory predictions are omnipresent in all aspects of the experimental measurements, and their further development is continuously ongoing. Precision measurements of Standard Model parameters require highly accurate theoretical input to relate the observed cross sections and distributions to the theory parameters. Searches for the Higgs boson and for new particles beyond the Standard Model rely on an intricate separation of potential signals from Standard Model background processes, which both need to be predicted to high precision. The Sinergia project we propose will combine the spectrum of skills of the Swiss particle theory groups in view of an optimal exploitation of the CERN LHC data. In close interaction with the experimental groups, we plan to perform calculations of immediate relevance to ongoing and newly proposed experimental data analyses, and aim to identify new observables of high physics impact. In this project, we address the four types of observables at the LHC: 1. The study of electroweak vector boson (W, Z) production, including perturbative corrections and resummation, especially in view of preparing a precise measurement of the W-boson mass at the LHC. 2. The study of hadronic final states (event shapes and jet cross sections) at the LHC, in view of precision studies of QCD and of the improvement and tuning of event generators. 3. The study of the production of top quark pairs in association with a high-mass system in view of measuring the top quark couplings to gauge bosons and the Higgs boson. 4. The study of Higgs boson production in view of the determination of Higgs boson properties and of establishing the Higgs mechanism of electroweak symmetry breaking.For each of these classes of observables, we plan a broad program of improvements to the theoretical predictions, which coordinates closely with the demands of the corresponding experimental studies. The different subprojects will mutually benefit from each other by exchange of techniques and results. Our work will contribute to sharpen our understanding of elementary particle physics at the Terascale and beyond, which may provide a guide towards a unified theory of fundamental particles and interactions.
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