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Strong interaction at low energy, flavour physics and the search for new physics

English title Strong interaction at low energy, flavour physics and the search for new physics
Applicant Colangelo Gilberto
Number 163280
Funding scheme Project funding
Research institution Institut für Theoretische Physik Universität Bern
Institution of higher education University of Berne - BE
Main discipline Theoretical Physics
Start/End 01.11.2015 - 31.10.2017
Approved amount 438'543.00
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Keywords (7)

chiral perturbation theory; dispersion relations; isospin symmetry breaking; effective field theories; flavour mixing; CP violation; anomalous magnetic moment of the muon

Lay Summary (Italian)

Lead
Si puo` essere vittima del proprio successo? Questo e` quanto succede in fisica delle particelle: la teoria che descrive tutti gli esperimenti di laboratorio fatti finora, il modello standard, e` stata formulata piu` di quarant'anni fa, e l'ultima conferma di essa (la scoperta del bosone di Higgs) ne ha coronato il successo in maniera definitiva. E tuttavia sappiamo che questa non e` la teoria finale e che ci sono fenomeni che non possono essere spiegati da essa.La ricerca di effetti che vadano al di la` di questa teoria e` uno degli obiettivi centrale dell'odierna ricerca in fisica delle particelle ed e` il tema centrale di questo progetto.
Lay summary
Questa ricerca procede lungo due direttive principali: quella dell'alta
energia e dell'alta precisione. Realizzando collisioni tra particelle a
energie sempre piu` alte, si cerca di creare e osservare nuove particelle,
non presenti nel modello standard. Aumentando la precisione di misure di
bassa energia invece, si cercano piccole deviazioni dalle predizioni
del modello standard: in questo caso l'evidenza sperimentale di nuove
particelle e` solo indiretta.

Obiettivo di questo progetto e` quello di migliorare la precisione
delle predizioni teoriche del modello standard per degli osservabili che
sono stati o saranno misurate con alta precisione. Solo in questo modo e`
possibile ottenere una convincente evidenza sperimentale di effetti
non spiegabili all'interno del modello standard. La difficolta` maggiore
di questi calcoli teorici risiede nel fatto che per le interazioni forti
non abbiamo ancora sviluppato delle tecniche di calcolo efficienti, che
ci permettano di raggiungere la necessaria precisione in maniera semplice.

Uno degli obiettivi del progetto e` in particolare quello di migliorare la
precisione teorica nel calcolo del rapporto giromagnetico anomalo del muone,
soprattutto dei contributi ad esso che vengono dalle interazioni forti.
Per questa grandezza, misurata con l'incredibile precisione di 0.6 parti
per milione, esiste una discrepanza tra la predizione teorica e la misura
di piu` di tre deviazioni standard. Una spiegazione dell'origine di questa
discrepanza e` obiettivo di molte ricerche sia teoriche che sperimentali
in molti centri di ricerca del mondo, ed anche di questo progetto.
Direct link to Lay Summary Last update: 09.11.2015

Responsible applicant and co-applicants

Employees

Publications

Publication
A dispersive treatment of Kl4 decays
Stoffer Peter, Colangelo Gilberto, Passemar Emilie (2017), A dispersive treatment of Kl4 decays, in Proceedings, International Conference on Kaon Physics (KAON 2016): Birmingham, United Kingdom, Septe, 800(1), 012026-012026.
Chiral Symmetry restoration from the hadronic regime
Gomez Nicola Angel, Cortes Santiago, Morales John, Ruiz de Elvira Jacobo, Torres Andres Ricardo (2017), Chiral Symmetry restoration from the hadronic regime, in Proceedings, 12th Conference on Quark Confinement and the Hadron Spectrum (Confinement XII): Thessal, 137, 07016-07016.
Dispersion relation for hadronic light-by-light scattering: two-pion contributions
Colangelo Gilberto, Hoferichter Martin, Procura Massimiliano, Stoffer Peter (2017), Dispersion relation for hadronic light-by-light scattering: two-pion contributions, in JHEP, 04, 161-161.
Dispersive analysis of KS → γγ and KS → γl+l−
Tunstall Lewis C., Colangelo Gilberto, Stucki Ramon (2017), Dispersive analysis of KS → γγ and KS → γl+l−, in Proceedings, International Conference on Kaon Physics (KAON 2016): Birmingham, United Kingdom, Septe, 800(1), 012034-012034.
Feynman–Hellmann theorem for resonances and the quest for QCD exotica
Ruiz de Elvira J., Meißner U. -G., Rusetsky A., Schierholz G. (2017), Feynman–Hellmann theorem for resonances and the quest for QCD exotica, in Eur. Phys. J., C77(10), 659-659.
Probing lepton flavour (universality) violation at NA62 and future kaon experiments
Tunstall Lewis C., Crivellin Andreas, D'Ambrosio Giancarlo, Hoferichter Martin (2017), Probing lepton flavour (universality) violation at NA62 and future kaon experiments, in Proceedings, International Conference on Kaon Physics (KAON 2016): Birmingham, United Kingdom, Septe, 800(1), 012014-012014.
Reconciling threshold and subthreshold expansions for pion–nucleon scattering
Siemens D., Ruiz de Elvira J., Epelbaum E., Hoferichter M., Krebs H., Kubis B., Meißner U. -G. (2017), Reconciling threshold and subthreshold expansions for pion–nucleon scattering, in Phys. Lett., B770, 27-34.
Rescattering effects in the hadronic-light-by-light contribution to the anomalous magnetic moment of the muon
Colangelo Gilberto, Hoferichter Martin, Procura Massimiliano, Stoffer Peter (2017), Rescattering effects in the hadronic-light-by-light contribution to the anomalous magnetic moment of the muon, in Phys. Rev. Lett., 118(23), 232001-232001.
Review of lattice results concerning low-energy particle physics
Aoki S., others (2017), Review of lattice results concerning low-energy particle physics, in Eur. Phys. J., C77(2), 112-112.
Roy–Steiner-equation analysis of pion–nucleon scattering
Meißner U. G., Ruiz de Elvira J., Hoferichter M., Kubis B. (2017), Roy–Steiner-equation analysis of pion–nucleon scattering, in Proceedings, 12th Conference on Quark Confinement and the Hadron Spectrum (Confinement XII): Thessal, 137, 01014-01014.
Strange resonance poles from $Kπ $ scattering below 1.8 GeV
Peláez J. R., Rodas A., Ruiz de Elvira J. (2017), Strange resonance poles from $Kπ $ scattering below 1.8 GeV, in Eur. Phys. J., C77(2), 91-91.
η → 3 π: Study of the Dalitz plot and extraction of the quark mass ratio Q
Colangelo Gilberto, Lanz Stefan, Leutwyler Heinrich, Passemar Emilie (2017), η → 3 π: Study of the Dalitz plot and extraction of the quark mass ratio Q, in Phys. Rev. Lett., 118(2), 022001-022001.
A dispersive treatment of Kl4 decays
Stoffer Peter, Colangelo Gilberto, Passemar Emilie (2016), A dispersive treatment of Kl4 decays, in Proceedings, 8th International Workshop on Chiral Dynamics (CD15): Pisa, Italy, June 29-July 3, 2015, CD15, 067-067.
Dispersion relation for hadronic light-by-light scattering
Procura Massimiliano, Colangelo Gilberto, Hoferichter Martin, Stoffer Peter (2016), Dispersion relation for hadronic light-by-light scattering, in Proceedings, Workshop on Flavour changing and conserving processes 2015 (FCCP2015): Anacapri, Capri , 118, 01030-01030.
Dispersion relation for hadronic light-by-light scattering and the muon g-2
Colangelo Gilberto, Stoffer Peter, Hoferichter Martin, Procura Massimiliano (2016), Dispersion relation for hadronic light-by-light scattering and the muon g-2, in Proceedings, 8th International Workshop on Chiral Dynamics (CD15): Pisa, Italy, June 29-July 3, 2015, CD15, 008-008.
Dispersive treatment of KS→γγ and KS→γℓ+ℓ−
Colangelo Gilberto, Stucki Ramon, Tunstall Lewis C. (2016), Dispersive treatment of KS→γγ and KS→γℓ+ℓ−, in Eur. Phys. J., C76(11), 604-604.
Hadronic light-by-light scattering and the muon g−2
Stoffer Peter, Colangelo Gilberto, Hoferichter Martin, Procura Massimiliano (2016), Hadronic light-by-light scattering and the muon g−2, in Proceedings, 29th Rencontres de Physique de La Vallée d'Aoste: La Thuile, Aosta, Italy, March 1-7, 2, C38(4), 135-135.
Lepton flavor (universality) violation in rare kaon decays
Tunstall Lewis (2016), Lepton flavor (universality) violation in rare kaon decays, in Proceedings, 38th International Conference on High Energy Physics (ICHEP 2016): Chicago, IL, USA, Au, ICHEP2016, 553-553.
Pseudoscalar mesons in a finite cubic volume with twisted boundary conditions
Colangelo Gilberto, Vaghi Alessio (2016), Pseudoscalar mesons in a finite cubic volume with twisted boundary conditions, in JHEP, 07, 134-134.
Stop searches in flavourful supersymmetry
Crivellin Andreas, Haisch Ulrich, Tunstall Lewis C. (2016), Stop searches in flavourful supersymmetry, in JHEP, 09, 080-080.
Violation of lepton flavor and lepton flavor universality in rare kaon decays
Crivellin Andreas, D'Ambrosio Giancarlo, Hoferichter Martin, Tunstall Lewis C. (2016), Violation of lepton flavor and lepton flavor universality in rare kaon decays, in Phys. Rev., D93(7), 074038-074038.
Hadronic uncertainties and isospin violation in supersymmetric dark matter models
Tunstall Lewis, Crivellin Andreas, Hoferichter Martin, Procura Massimiliano (2015), Hadronic uncertainties and isospin violation in supersymmetric dark matter models, in Proceedings, 8th International Workshop on Chiral Dynamics (CD15): Pisa, Italy, June 29-July 3, 2015, CD15, 088-088.
Light stops, blind spots, and isospin violation in the MSSM
Crivellin Andreas, Hoferichter Martin, Procura Massimiliano, Tunstall Lewis C. (2015), Light stops, blind spots, and isospin violation in the MSSM, in JHEP, 07, 129-129.
Status of Chiral-Scale Perturbation Theory
Crewther R. J., Tunstall Lewis C. (2015), Status of Chiral-Scale Perturbation Theory, in Proceedings, 8th International Workshop on Chiral Dynamics (CD15): Pisa, Italy, June 29-July 3, 2015, CD15, 132-132.

Collaboration

Group / person Country
Types of collaboration
Dr. martin Hoferichter, University Washington, Seattle United States of America (North America)
- in-depth/constructive exchanges on approaches, methods or results
Prof. Urs Wenger, ITP, Uni Bern Switzerland (Europe)
- Publication
PD Dr. Bastian Kubis, University of Bonn Germany (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
Dr. Peter Stoffer, University of California, San Diego United States of America (North America)
- in-depth/constructive exchanges on approaches, methods or results
Dr. Massimiliano Procura, University of Vienna Austria (Europe)
- in-depth/constructive exchanges on approaches, methods or results
FLAG (Flavour Lattice Averaging Group) Switzerland (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
XVII International Conference on Hadron Spectroscopy and Structure Talk given at a conference Dispersive analysis of pion-nucleon scattering and the pion-nucleon sigma term 25.09.2017 Salamanca, Spain Colangelo Gilberto;
Workshop on 'Flavour changing and conserving processes' (FCCP 2017) Talk given at a conference Dispersion relations for hadronic light-by-light scattering 07.09.2017 Anacapri (Capri), Israel Colangelo Gilberto;
Santa Fe Workshop on Lattice QCD Talk given at a conference Dispersive constraints/results on (g-2)μ 28.08.2017 Santa Fe, United States of America Colangelo Gilberto;
PHIPSI: International Workshop on e+e- collisions from Phi to Psi 2017 Poster HLBL Dispersive theory Bern 26.06.2017 Mainz, Germany Colangelo Gilberto;
35th International Symposium on Lattice Field Theory (LATTICE 2017) Talk given at a conference Hadronic light-by-light contribution to (g-2)μ: a dispersive approach 18.06.2017 Granada, Spain Colangelo Gilberto;
2nd Rare 'n' Strange Workshop Talk given at a conference Dispersive analysis of Ks->\mu\mu 26.04.2017 Santiago de Compostela, Spain Ruiz de Elvira Carrascal Jacobo;
The International Workshop on Partial Wave Analyses and Advanced Tools for Hadron Spectroscopy (PWA9/ATHOS4) Talk given at a conference Dispersive analysis of piN scattering 13.03.2017 Bad Honnef, Germany Ruiz de Elvira Carrascal Jacobo;
Results and Perspectives in Particle Physics Talk given at a conference Hadronic Light-by-Light Contribution to (g-2) within a Dispersive Approach 05.03.2017 La Thuile, Aosta Valley, Italy Colangelo Gilberto;
Towards high precision muon g-2/EDM measurement at J-PARC Talk given at a conference Dispersive calculation of the hadronic light-by-light contribution to a_mu 28.11.2016 Tokai, Ibaraki, Japan Colangelo Gilberto;
Hadronic Contributions to New-Physics Searches (HC2NP 2016) Talk given at a conference Dispersion relation for hadronic light-by-light scattering and the muon g-2 25.09.2016 Puerto de la Cruz, Teneriffa, Spain Colangelo Gilberto;
KAON 2016 Talk given at a conference “Lepton flavour (universality) violation in rare kaon decays” and “Dispersive treatment of KS -> gamma gamma and KS -> gamma l+ l-“. 14.09.2016 Brimingham, Great Britain and Northern Ireland Tunstall Lewis;
XIIth Quark Confinement and the Hadron Spectrum Talk given at a conference Chiral-scale perturbation theory and the renormalization group 28.08.2016 Thessaloniki, Greece Tunstall Lewis;
Origin of Mass 2016 Talk given at a conference Dispersive treatment of the hadronic light-by-light contribution to (g-2) of the muon 30.05.2016 Odense, Denmark Colangelo Gilberto;
NA62 Kaon Physics Handbook Talk given at a conference Pi Pi Scattering Length Measurements 11.01.2016 Mainz, Germany Colangelo Gilberto;


Self-organised

Title Date Place
SWHEPPS 2016 07.06.2016 Unterägeri, Switzerland

Associated projects

Number Title Start Funding scheme
149272 Strong interaction at low energy, flavour physics and the search for new physics 01.11.2013 Project funding
175791 Strong interaction at low energy, flavour physics and the search for new physics 01.11.2017 Project funding

Abstract

While searching for signals of new physics at the high-energy frontier, itis important to continue to look for deviations from the Standard Model(SM) predictions also in low-energy phenomena. This means also to try andbetter understand all observed deviations. The present project, like myprevious ones, is firmly anchored in the latter line of research.Indeed in low-energy phenomenology there are a few puzzles which continueto remain unexplained. One of the most resistant to theoretical andexperimental scrutiny remains that of the $(g-2)$ of the muon. Whilefourteen years ago the discrepancy between measurement and SM predictionhas been called a ``harbinger of new physics'', the increased bounds on themasses of all beyond-the-Standard-Model (BSM) particles makes the samediscrepancy a true puzzle. For example, the ``natural'' explanation of thediscrepancy within a supersymmetric (SUSY) extension of the SM has nowbecome very problematic because the bounds on the SUSY particles --especially those of the first and second generation, which are those neededto explain the $(g-2)_\mu$ puzzle -- are now too high.In summary, right before the start of the second running phase of the LHCthe confirmations of the SM have increased both in precision and in number.The fundamental scalar assumed to be responsible for electroweak symmetrybreaking has been discovered and the flavour and CP violations observed areall compatible with the SM. The possibility that the SM is valid up to ascale much higher than the TeV, despite naturalness arguments, has now tobe considered more seriously. Whether this possibility is confirmed byexperimental investigations at the maximal LHC energy will become knownsoon. For what concerns low-energy phenomenology the challenge still remains toreduce hadronic uncertainties in observables where there is an apparentdiscrepancy between measurement and SM prediction which is not yet fullyunderstood. This will be the main goal of this project.
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