Publications (70)
Supersymmetric models with minimal flavour violation and their running
Gilberto Colangelo, Emanuel Nikolidakis, Christopher Smith
We revisit the formulation of the principle of minimal flavor violation (MFV) in the minimal supersymmetric extension of the standard model, both at moderate and large tan(beta), a…
Twisted Mass Finite Volume Effects
Gilberto Colangelo, Urs Wenger, Jackson M. S. Wu
We calculate finite volume effects on the pion masses and decay constant in twisted mass lattice QCD (tmLQCD) at finite lattice spacing. We show that the lighter neutral pion in tm…
Constraints on the two-pion contribution to hadronic vacuum polarization
Gilberto Colangelo, Martin Hoferichter, Peter Stoffer
At low energies hadronic vacuum polarization (HVP) is strongly dominated by two-pion intermediate states, which are responsible for about of the HVP contribution to the anom…
Theory of pi pi scattering
Gilberto Colangelo
I describe the current status of the theory of pi pi scattering, reviewing in particular recent work on the numerical solution of Roy equations and on the matching between these an…
Remarks on higher-order hadronic corrections to the muon g-2
Gilberto Colangelo, Martin Hoferichter, Andreas Nyffeler +2
Recently, it was shown that insertions of hadronic vacuum polarization at O(alpha^4) generate non-negligible effects in the calculation of the anomalous magnetic moment of the muon…
Towards a data-driven analysis of hadronic light-by-light scattering
Gilberto Colangelo, Martin Hoferichter, Bastian Kubis +2
The hadronic light-by-light contribution to the anomalous magnetic moment of the muon was recently analyzed in the framework of dispersion theory, providing a systematic formalism…
The decay : study of the Dalitz plot and extraction of the quark mass ratio
Gilberto Colangelo, Stefan Lanz, Heinrich Leutwyler +1
The amplitude is sensitive to the quark mass difference and offers a unique way to determine the quark mass ratio …
A New Dispersive Analysis of eta --> 3 pi
Gilberto Colangelo, Stefan Lanz, Emilie Passemar
We present a new dispersive analysis of the isospin breaking decay eta --> 3 pi. The resulting representation of the decay amplitude allows us to determine the quark mass double ra…
Review of lattice results concerning low energy particle physics
Gilberto Colangelo, Stephan Durr, Andreas Juttner +9
We review lattice results relevant for pion and kaon physics with the aim of making them easily accessible to the particle physics community. Specifically, we review the determinat…
Chiral perturbation theory, dispersion relations and final state interactions in K -> pi pi
Gilberto Colangelo
We discuss the recent literature on the treatment of final state interactions in K -> pi pi. Various approaches are compared and particular emphasis is given to the possibility of…
Chiral extrapolation of hadronic vacuum polarization
Gilberto Colangelo, Martin Hoferichter, Bastian Kubis +2
We study the pion-mass dependence of the two-pion channel in the hadronic-vacuum-polarization (HVP) contribution to the anomalous magnetic moment of the muon , by…
Dispersive analysis of
Gilberto Colangelo, Stefan Lanz, Heinrich Leutwyler +1
The dispersive analysis of the decay is reviewed and thoroughly updated with the aim of determining the quark mass ratio ~. With the…
The pion mass in finite volume
Gilberto Colangelo, Stephan Dürr
We determine the relative pion mass shift due to the finite spatial extent of the box by means of two-flavor chiral perturbation theory and the one-particle LÃ…
A theory vade mecum for PSI experiments
Gilberto Colangelo, Franziska Hagelstein, Adrian Signer +1
This article gives a compact introduction and overview of the theory underlying the experiments described in the rest of this review.
A Dispersive Treatment of Decays
Gilberto Colangelo, Emilie Passemar, Peter Stoffer
decays offer several reasons of interest: they allow an accurate measurement of -scattering lengths; they provide the best source for the determination of some lo…
Virtual photon-photon scattering
Martin Hoferichter, Gilberto Colangelo, Massimiliano Procura +1
Based on analyticity, unitarity, and Lorentz invariance the contribution from hadronic vacuum polarization to the anomalous magnetic moment of the muon is directly related to the c…
Rescattering effects in the hadronic-light-by-light contribution to the anomalous magnetic moment of the muon
Gilberto Colangelo, Martin Hoferichter, Massimiliano Procura +1
We present a first model-independent calculation of intermediate states in the hadronic-light-by-light (HLbL) contribution to the anomalous magnetic moment of the muon $(g-2…
Hadronic contributions to a_μbelow one GeV
Gilberto Colangelo
I present a method for evaluating the hadronic vacuum polarization contribution below 1 GeV to a_μwhich relies on analyticity, unitarity and chiral symmetry, as well as on data. T…
A Dispersive Treatment of Decays
Gilberto Colangelo, Emilie Passemar, Peter Stoffer
are for several reasons an especially interesting decay channel of mesons: decays allow an accurate measurement of a combination of -wave scat…
Dispersion relation for hadronic light-by-light scattering: two-pion contributions
Gilberto Colangelo, Martin Hoferichter, Massimiliano Procura +1
In this third paper of a series dedicated to a dispersive treatment of the hadronic light-by-light (HLbL) tensor, we derive a partial-wave formulation for two-pion intermediate sta…
Chiral extrapolation of hadronic vacuum polarization and isospin-breaking corrections
Martin Hoferichter, Gilberto Colangelo, Bai-Long Hoid +4
By far the biggest contribution to hadronic vacuum polarization (HVP) arises from the two-pion channel. Its quark-mass dependence can be evaluated by combining dispersion relations…
pi pi scattering, pion form factors and chiral perturbation theory
Gilberto Colangelo
I discuss recent progress in our understanding of the pi pi scattering amplitude at low energy thanks to the combined use of chiral perturbation theory and dispersion relations. I…
Overview of Chiral Perturbation Theory
Gilberto Colangelo
I present a quick overview of the current status of Chiral perturbation theory in the meson sector. To illustrate the successes and some problems in the description of the phenomen…
Isospin-breaking in the scattering amplitude I: Effects due to the pion mass difference
Gilberto Colangelo, Martina Cottini, Jacobo Ruiz de Elvira
This is the first of a series of papers devoted to a detailed analysis of isospin-breaking effects in the scattering amplitude and the vector form factor of the pion. Isospi…
Mass and width of the lowest resonance in QCD
Irinel Caprini, Gilberto Colangelo, Heinrich Leutwyler
We demonstrate that near the threshold, the pi pi scattering amplitude contains a pole with the quantum numbers of the vacuum - commonly referred to as the sigma - and determine it…
Hadronic contributions to the muon anomalous magnetic moment Workshop. : Quo vadis? Workshop. Mini proceedings
Maurice Benayoun, Johan Bijnens, Tom Blum +37
We present the mini-proceedings of the workshops Hadronic contributions to the muon anomalous magnetic moment: strategies for improvements of the accuracy of the theoretical predic…
Supersymmetric contributions to rare kaon decays: beyond the single mass-insertion approximation
Gilberto Colangelo, Gino Isidori
We analyze the contributions to rare kaon decays mediated by flavor-changing Z-penguin diagrams in a generic low-energy supersymmetric extension of the Standard Model. In order to…
Report of the Snowmass 2021 Topical Group on Lattice Gauge Theory
Zohreh Davoudi, Ethan T. Neil, Christian W. Bauer +35
Lattice gauge theory continues to be a powerful theoretical and computational approach to simulating strongly interacting quantum field theories, whose applications permeate almost…
On the factorization of chiral logarithms in the pion form factors
Gilberto Colangelo, Massimiliano Procura, Lorena Rothen +2
The recently proposed hard-pion chiral perturbation theory predicts that the leading chiral logarithms factorize with respect to the energy dependence in the chiral limit. This cla…
Two-pion contribution to hadronic vacuum polarization
Gilberto Colangelo, Martin Hoferichter, Peter Stoffer
We present a detailed analysis of data up to in the framework of dispersion relations. Starting from a family of -wave phase…
Dispersion relation for hadronic light-by-light scattering: theoretical foundations
Gilberto Colangelo, Martin Hoferichter, Massimiliano Procura +1
In this paper we make a further step towards a dispersive description of the hadronic light-by-light (HLbL) tensor, which should ultimately lead to a data-driven evaluation of its…
Isospin-breaking effects in the two-pion contribution to hadronic vacuum polarization
Gilberto Colangelo, Martin Hoferichter, Bastian Kubis +1
Isospin-breaking (IB) effects in the two-pion contribution to hadronic vacuum polarization (HVP) can be resonantly enhanced, if related to the interference of the and $Ï…
Dispersive treatment of and
Gilberto Colangelo, Ramon Stucki, Lewis C. Tunstall
We analyse the rare kaon decays and $(\ell = e \mbox{ or } μ)$ in a dispersive framework in which the weak Hamiltonian carries momentum. Ou…
Regge analysis of the pi pi scattering amplitude
Irinel Caprini, Gilberto Colangelo, Heinrich Leutwyler
The theoretical predictions for the subtraction constants lead to a very accurate dispersive representation of the pi pi scattering amplitude below 0.8 GeV. The extension of this r…
Puzzles in the hadronic contributions to the muon anomalous magnetic moment
Gilberto Colangelo, Martin Hoferichter, Peter Stoffer
We summarize recent developments in the Standard-Model evaluation of the anomalous magnetic moment of the muon , both in the hadronic-light-by-light and hadronic-vacuum-polar…
Quenched Chiral Perturbation Theory to one loop
Gilberto Colangelo, Elisabetta Pallante
We calculate the divergences of the generating functional of quenched Chiral Perturbation Theory at one loop, and renormalize the theory by an appropriate definition of the counter…
Hadronic light-by-light contribution to : a dispersive approach
Gilberto Colangelo, Martin Hoferichter, Massimiliano Procura +1
After a brief introduction on ongoing experimental and theoretical activities on , we report on recent progress in approaching the calculation of the hadronic light-by-li…
Double chiral logs in the scattering amplitude
Gilberto Colangelo
By using the Renormalization Group Equations in Chiral Perturbation Theory, one can calculate the double chiral logs that appear at two loops in any matrix element. We calculate th…
An asymptotic formula for the pion decay constant in a large volume
Gilberto Colangelo, Christoph Haefeli
We derive an asymptotic formula a la Luscher for the finite volume correction to the pion decay constant: this is expressed as an integral over the < 3 Ï| A_μ|0 > amplitude after…
Review of lattice results concerning low energy particle physics
Sinya Aoki, Yasumichi Aoki, Claude Bernard +25
We review lattice results related to pion, kaon, D- and B-meson physics with the aim of making them easily accessible to the particle physics community. More specifically, we repor…
Theoretical Aspects of the Pion-Pion Interaction
Irinel Caprini, Gilberto Colangelo, Heinrich Leutwyler
We give a brief review of the theoretical description of low energy pion-pion scattering by the combined use of Chiral Perturbation Theory and Roy equations, an update of the Regge…
Recent developments in chiral perturbation theory
Gilberto Colangelo
I briefly review the current status of chiral perturbation theory in the meson sector. Emphasis is given on the quest for higher precision. I discuss two examples: one where it is…
Finite volume effects for meson masses and decay constants
Gilberto Colangelo, Stephan Durr, Christoph Haefeli
We present a detailed numerical study of finite volume effects for masses and decay constants of the octet of pseudoscalar mesons. For this analysis we use chiral perturbation theo…
Pseudoscalar mesons in a finite cubic volume with twisted boundary conditions
Gilberto Colangelo, Alessio Vaghi
We study the effects of a finite cubic volume with twisted boundary conditions on pseudoscalar mesons. We first apply chiral perturbation theory in the p-regime and calculate the c…
Dispersive approach to hadronic light-by-light scattering
Gilberto Colangelo, Martin Hoferichter, Massimiliano Procura +1
Based on dispersion theory, we present a formalism for a model-independent evaluation of the hadronic light-by-light contribution to the anomalous magnetic moment of the muon. In p…
A phenomenological estimate of isospin breaking in hadronic vacuum polarization
Martin Hoferichter, Gilberto Colangelo, Bai-Long Hoid +5
Puzzles in the determination of the hadronic-vacuum-polarization contribution currently impede a conclusive interpretation of the precision measurement of the anomalous magnetic mo…
Comparison of Lattice and Chiral Perturbation Theory calculations of pion scattering lengths
Gilberto Colangelo
I compare the lattice calculation of Fukugita et al. for the pion S-wave scattering lengths to the predictions of Chiral Perturbation Theory to two loop accuracy. I find good agree…
Radiative corrections to the forward-backward asymmetry in
Gilberto Colangelo, Martin Hoferichter, Joachim Monnard +1
We present a calculation of the -odd radiative corrections to in a dispersive formalism, concentrating on the leading pion-pole contribution in the virtual…
Short-distance constraints on hadronic light-by-light scattering in the anomalous magnetic moment of the muon
Gilberto Colangelo, Franziska Hagelstein, Martin Hoferichter +2
A key ingredient in the evaluation of hadronic light-by-light (HLbL) scattering in the anomalous magnetic moment of the muon concerns short-distance constraints (SDCs) t…
Longitudinal short-distance constraints for the hadronic light-by-light contribution to with large- Regge models
Gilberto Colangelo, Franziska Hagelstein, Martin Hoferichter +2
While the low-energy part of the hadronic light-by-light (HLbL) tensor can be constrained from data using dispersion relations, for a full evaluation of its contribution to the ano…
Kaon Physics: A Cornerstone for Future Discoveries
Jason Aebischer, Atakan Tugberk Akmete, Riccardo Aliberti +153
The kaon physics programme, long heralded as a cutting-edge frontier by the European Strategy for Particle Physics, continues to stand at the intersection of discovery and innovati…
A brief introduction to dispersive methods
Gilberto Colangelo
These lectures aim to provide a basic introduction to dispersive methods and their modern applications to the phenomenology of the Standard Model at low energy. This approach explo…
Isospin breaking in Kl4 decays
Gilberto Colangelo, Juerg Gasser, Akaki Rusetsky
Data on Ke4 decays allow one to extract experimental information on the elastic pi pi scattering amplitude near threshold, and to confront the outcome of the analysis with predicti…
Theoretical progress on pi pi scattering lengths and phases
Gilberto Colangelo
pi pi scattering at low energy is sensitive to the structure of the QCD vacuum. I review the calculations of the pi pi scattering lengths and phases, and group them in three catheg…
Radiative corrections and Monte Carlo tools for low-energy hadronic cross sections in collisions
Riccardo Aliberti, Paolo Beltrame, Ettore Budassi +32
We present the results of Phase I of an ongoing review of Monte Carlo tools relevant for low-energy hadronic cross sections. This includes a detailed comparison of Monte Carlo code…
Strange Hadron Spectroscopy with Secondary KL Beam in Hall D
KLF Collaboration, Moskov Amaryan, Mikhail Bashkanov +150
We propose to create a secondary beam of neutral kaons in Hall D at Jefferson Lab to be used with the GlueX experimental setup for strange hadron spectroscopy. The superior CEBAF e…
Cusps in K --> 3 pi decays
Gilberto Colangelo, Juerg Gasser, Bastian Kubis +1
The pion mass difference generates a pronounced cusp in K --> 3 pi decays. As has recently been pointed out by Cabibbo and Isidori, an accurate measurement of the cusp may allow on…
Radiative corrections to
Gilberto Colangelo, Martina Cottini, Martin Hoferichter +1
Hadronic decays present an opportunity to determine the isovector part of the hadronic-vacuum-polarization contribution to the anomalous magnetic moment of the muon in a way c…
Lattice determination of the QCD low-energy constant
Claudio Bonanno, Gilberto Colangelo, Francesco D'Angelo +8
We provide a non-perturbative determination of the scheme- and scale-independent low-energy constant , appearing in the QCD effective chiral Lagrangia…
The Mesonic Chiral Lagrangian of Order
Johan Bijnens, Gilberto Colangelo, Gerhard Ecker
We construct the effective chiral Lagrangian for chiral perturbation theory in the mesonic even-intrinsic-parity sector at order . The Lagrangian contains 112 in principle mea…
Pion loops in quenched Quantum Chromodynamics
Gilberto Colangelo, Elisabetta Pallante
We calculate the divergences of the generating functional of quenched Chiral Perturbation Theory to one loop for a generic number of flavours. The flavour number dependence of our…
An introduction to CHPT
Gilberto Colangelo, Gino Isidori
These lectures provide an elementary introduction to Chiral Perturbation Theory, focused on the sector of pseudoscalar meson interactions. Basic concepts and technical methods of t…
Improved calculation of radiative corrections to decays
Gilberto Colangelo, Martina Cottini, Martin Hoferichter +1
A reliable calculation of radiative corrections to decays is an important prerequisite for using hadronic decays for a data-driven evaluation of the hadronic-…
The pion and proton mass in finite volume
Gilberto Colangelo, Andreas Fuhrer, Christoph Haefeli
We calculate the finite volume effects for the pion and nucleon mass. For the pion mass we present the results of a full two-loop calculation in chiral perturbation theory. The out…
Finite volume effects in chiral perturbation theory
Gilberto Colangelo
There has recently been an intense activity in the study of finite volume effects by means of chiral perturbation theory. In this contribution I review recent work in this field bo…
Finite volume effects for nucleon and heavy meson masses
Gilberto Colangelo, Andreas Fuhrer, Stefan Lanz
We apply the resummed version of the Lüscher formula to analyze finite volume corrections to the mass of the nucleon and of heavy mesons. We show that by applying the subthreshold…
Finite volume effects for the pion mass at two loops
Gilberto Colangelo, Christoph Haefeli
We evaluate the pion mass in finite volume to two loops within Chiral Perturbation Theory. The results are compared with a recently proposed extension of the asymptotic formula of…
Renormalization group equations for effective field theories
Matthias Buchler, Gilberto Colangelo
We derive the renormalization group equations for a generic nonrenormalizable theory. We show that the equations allow one to derive the structure of the leading divergences at any…
Short-distance constraints for the longitudinal component of the hadronic light-by-light amplitude: an update
Gilberto Colangelo, Franziska Hagelstein, Martin Hoferichter +2
We reassess the impact of short-distance constraints for the longitudinal component of the hadronic light-by-light amplitude on the anomalous magnetic moment of the muon, $a_μ=(g-…
Structure Functions in Semihadronic Tau Decays
Gilberto Colangelo, Markus Finkemeier, Erwin Mirkes +1
We review a variety of topics related to hadronic structure functions in exclusive semihadronic tau decays. We introduce the concept of structure functions and summarize the most i…