Workshop summary -- Kaons@CERN 2023

Abstract

Kaon physics is at a turning point -- while the rare-kaon experiments NA62 and KOTO are in full swing, the end of their lifetime is approaching and the future experimental landscape needs to be defined. With HIKE, KOTO-II and LHCb-Phase-II on the table and under scrutiny, it is a very good moment in time to take stock and contemplate about the opportunities these experiments and theoretical developments provide for particle physics in the coming decade and beyond. This paper provides a compact summary of talks and discussions from the Kaons@CERN 2023 workshop.

55 pages, Summary of Kaons@CERN 23 workshop, references updated, typos fixed, version as published in EPJC

References in corpus (126)

• Observation of a new particle in the search for the Standard Model Higgs boson with the ATLAS detector at the LHC
• Observation of a new boson at a mass of 125 GeV with the CMS experiment at the LHC
• Dimension-Six Terms in the Standard Model Lagrangian
• The Search for Heavy Majorana Neutrinos
• FLAG Review 2021
• Kaon Decays in the Standard Model
• Anomalies in $B$-decays and $U(2)$ flavour symmetry
• Two-Loop Electroweak Corrections for the K -> pi nu anti-nu Decays
• The 2004 UTfit Collaboration Report on the Status of the Unitarity Triangle in the Standard Model
• The Beam and detector of the NA62 experiment at CERN
• Semileptonic decays of light quarks beyond the Standard Model
• Importance of Loop Effects in Explaining the Accumulated Evidence for New Physics in B Decays with a Vector Leptoquark
• Towards a consistent estimate of the chiral low-energy constants
• Flavor probes of axion-like particles
• Mesonic low-energy constants
• The Axiflavon
• Quark Flavor Phenomenology of the QCD Axion
• The Present and Future Status of Heavy Neutral Leptons
• Search for $K_L\to {\pi }^0\nu \overline{\nu }$ and $K_L\to {\pi }^0{X}^0$ Decays at the J-PARC KOTO Experiment
• Standard-model prediction for direct CP violation in $K\to \pi \pi$ decay
• Improved estimates of rare K decay matrix-elements from Kl3 decays
• QED in finite volume and finite size scaling effect on electromagnetic properties of hadrons
• Pion-pole contribution to hadronic light-by-light scattering in the anomalous magnetic moment of the muon
• Precise Measurements of Direct CP Violation, CPT Symmetry, and Other Parameters in the Neutral Kaon System
• Charm Quark Contribution to K+ -> pi+ nu anti-nu at Next-to-Next-to-Leading Order
• Precise Determination of |V{us}| from Lattice Calculations of Pseudoscalar Decay Constants
• Measurement of the very rare $K^{+}\to {\pi }^{+}\nu \bar{\nu }$ decay
• Light-quark Loops in K->pi nu nu
• $K\to \pi \pi$ $\Delta I=3/2$ decay amplitude in the continuum limit
• Dispersive analysis of the pion transition form factor
• First lattice calculation of the QED corrections to leptonic decay rates
• QED Corrections to Hadronic Processes in Lattice QCD
• Electroweak Corrections to the Charm Quark Contribution to K+ -> pi+ nu nu-bar
• Light-meson leptonic decay rates in lattice QCD+QED
• $K_L-K_S$ mass difference from lattice QCD
• FCNC portals to the dark sector
• $K\to \pi \nu \bar{\nu }$ and ${\epsilon }^{\prime }/\epsilon$ in Simplified New Physics Models
• New Vector-Like Fermions and Flavor Physics
• Charm-Quark Contribution to K_L -> mu^+ mu^- at Next-to-Next-to-Leading
• Improved Search for Heavy Neutrinos in the Decay $\pi \to e\nu$
• Measurement of the rare decay pi0 -> e+ e-
• Probing Muonic Forces and Dark Matter at Kaon Factories
• Lepton flavor (universality) violation in rare kaon decays
• Direct $CP$ Violation in $K\to {\mu }^{+}{\mu }^{-}$
• Chiral expansions of the pi0 lifetime
• A note on isospin violation in Pl2(gamma) decays
• Dark Neutrinos and a Three Portal Connection to the Standard Model
• Search for heavy neutral lepton production in $K^{+}$ decays to positrons
• Kaon electromagnetic form factors in dispersion theory
• Charged hadrons in local finite-volume QED+QCD with C* boundary conditions
• On the transition form factors of the axial-vector resonance $f_1(1285)$ and its decay into $e^{+}{e}^{-}$
• Dispersive representation and shape of the Kl3 form factors: robustness
• Scrutinizing CKM unitarity with a new measurement of the $K_{\mu 3}/K_{\mu 2}$ branching fraction
• Anatomy of flavour-changing Z couplings in models with partial compositeness
• Towards complete leading-order predictions for neutrinoless double $\beta$ decay
• Rare Kaon Decays on the Lattice
• Standard-model prediction of ${\epsilon }_K$ with manifest CKM unitarity
• Search for production of an invisible dark photon in ${\pi }^0$ decays
• Long distance contribution to the $K_L-K_S$ mass difference
• Search for $K^{+}$ decays to a muon and invisible particles
• Massive photons: an infrared regularization scheme for lattice QCD+QED
• Direct CP violation and the $\Delta I=1/2$ rule in $K\to \pi \pi$ decay from the Standard Model
• Electromagnetic effects in Kl3 decays
• Probing Lepton Flavour Universality with $K\to \pi \nu \bar{\nu }$ decays
• Determining the leading-order contact term in neutrinoless double $\mathbf{\beta }$ decay
• Exploratory Lattice QCD Study of the Rare Kaon Decay $K^{+}\to {\pi }^{+}\nu \bar{\nu }$
• Search for ${\pi }^0$ decays to invisible particles
• Study of the $K_L\to {\pi }^0\nu \overline{\nu }$ Decay at the J-PARC KOTO Experiment
• QED self energies from lattice QCD without power-law finite-volume errors
• Footprints of leptoquarks: from $R_{K^{(\ast )}}$ to $K\to \pi \nu \bar{\nu }$
• Non-standard semileptonic hyperon decays
• Non-universal gauge interactions addressing the inescapable link between Higgs and Flavour
• Observation of the rare decay K_S -> pi^0mu^+mu^-
• Searches for lepton number violating $K^{+}$ decays
• Rare decay ${\pi }^0\to e^{+}{e}^{-}$: on corrections beyond the leading order
• Prospects for a lattice computation of rare kaon decay amplitudes II $K\to \pi \nu \bar{\nu }$ decays
• Tests of non-standard electroweak couplings of right-handed quarks
• First exploratory calculation of the long-distance contributions to the rare kaon decays $K\to \pi {\ell }^{+}{\ell }^{-}$
• Radiative corrections to the Dalitz decay ${\pi }^0\to e^{+}{e}^{-}\gamma$ revisited
• Prospects for a lattice computation of rare kaon decay amplitudes: $K\to \pi {\ell }^{+}{\ell }^{-}$ decays
• A Dispersive Treatment of $K_{\ell 4}$ Decays
• On the pion decay constant
• Isospin-Violating Contributions to ${\epsilon }^{\prime }/\epsilon$
• Axial-vector transition form factors and $e^{+}{e}^{-}\to f_1{\pi }^{+}{\pi }^{-}$
• FCNC $B$ and $K$ Meson Decays with Light Bosonic Dark Matter
• Anatomy of kaon decays and prospects for lepton flavour universality violation
• Probing anomalous $t\bar{t}Z$ interactions with rare meson decays
• Evidence for the rare decay ${\Sigma }^{+}\to p{\mu }^{+}{\mu }^{-}$
• Lattice QCD study of the rare kaon decay $K^{+}\to {\pi }^{+}\nu \bar{\nu }$ at a near-physical pion mass
• Towards an improved understanding of $\eta \to {\gamma }^{\ast }{\gamma }^{\ast }$
• Complete theory of radiative corrections to $K_{\ell 3}$ decays and the $V_{us}$ update
• High-precision determination of the $K_{e3}$ radiative corrections
• Search for lepton number and flavour violation in $K^{+}$ and ${\pi }^0$ decays
• Constraints on the $K_{\mathrm{S}}^0\to {\mu }^{+}{\mu }^{-}$ branching fraction
• From B-meson anomalies to Kaon physics with scalar leptoquarks
• Measurement of CKM matrix elements in single top quark $t$-channel production in proton-proton collisions at $\sqrt{s}=$ 13 TeV
• Radiative corrections in K --> pi l+ l- decays
• Improved Standard-Model prediction for ${\pi }^0\to e^{+}{e}^{-}$
• Isospin-breaking corrections to light-meson leptonic decays from lattice simulations at physical quark masses
• Exploratory lattice QCD study of the rare kaon decay $K^{+}\to {\pi }^{+}\nu \bar{\nu }$
• Matching long and short distances at order $\mathcal{O}({\alpha }_s)$ in the form factors for $K\to \pi {\ell }^{+}{\ell }^{-}$
• Search for a light pseudoscalar particle in the decay $K_L^0\to {\pi }^0{\pi }^{0}X$
• Extension of the J-PARC Hadron Experimental Facility: Third White Paper
• Lattice QCD calculation of ${\pi }^0\to e^{+}{e}^{-}$ decay
• Searches for lepton number violating $K^{+}\to {\pi }^{-}({\pi }^0)e^{+}{e}^{+}$ decays
• Flavor Non-universal Vector Leptoquark Imprints in $K\to \pi \nu \bar{\nu }$ and $\Delta F=2$ Transitions
• Electroweak Corrections to the Charm-Top-Quark Contribution to ${\epsilon }_K$
• On the amplitudes for the CP-conserving $K^{\pm }(K_S)\to {\pi }^{\pm }({\pi }^0){\ell }^{+}{\ell }^{-}$ rare decay modes
• Study of the K0(L) --> pi0 pi0 nu nu-bar decay
• Impact of indirect CP violation on Br$(K_S\to {\mu }^{+}{\mu }^{-}{)}_{\ell =0}$
• Radiative corrections to the ${\eta }^{(\prime )}$ Dalitz decays
• Beyond the Standard Model prospects for kaon physics at future experiments
• Dark Sector Physics at High-Intensity Experiments
• Projected NA62 sensitivity to heavy neutral lepton production in $K^{+}\to {\pi }^0{e}^{+}N$ decays
• $C$ and $CP$ violation in effective field theories
• Precise determination of the branching ratio of the neutral-pion Dalitz decay
• Improved Standard-Model prediction for $K_L\to {\ell }^{+}{\ell }^{-}$
• A Precision Relation between $\Gamma (K\to {\mu }^{+}{\mu }^{-})(t)$ and $\mathcal{B}(K_L\to {\mu }^{+}{\mu }^{-})/\mathcal{B}(K_L\to \gamma \gamma )$
• Theoretical status of ${\epsilon }^{\prime }/\epsilon$
• Radiative corrections for the decay ${\Sigma }^0\to \Lambda e^{+}{e}^{-}$
• Radiative corrections to leptonic decays using infinite-volume reconstruction
• A search for the $K^{+}\to {\mu }^{-}\nu e^{+}{e}^{+}$ decay
• $K\to {\mu }^{+}{\mu }^{-}$ beyond the standard model
• Search for the Pair Production of Dark Particles $X$ with $K_L^0\to XX$, $X\to \gamma \gamma$
• First Search for the $K_L\to {\pi }^0\gamma$ Decay
• Snowmass White Paper: New flavors and rich structures in dark sectors