Igor Danilkin
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View article: The anomalous magnetic moment of the muon in the Standard Model: an update
The anomalous magnetic moment of the muon in the Standard Model: an update Open
We present the current Standard Model (SM) prediction for the muon anomalous magnetic moment, $a_μ$, updating the first White Paper (WP20) [1]. The pure QED and electroweak contributions have been further consolidated, while hadronic contr…
View article: Dalitz-plot decomposition for the $e^+ e^- \to J/ψ\, π\, π\, (K \bar{K})$ and $e^+ e^- \to h_c \, π\, π$ processes
Dalitz-plot decomposition for the $e^+ e^- \to J/ψ\, π\, π\, (K \bar{K})$ and $e^+ e^- \to h_c \, π\, π$ processes Open
We present an analysis of the $e^+ e^- \to γ^* \to J/ψ\, π\, π\, (K \bar{K})$ and $e^+ e^- \to γ^* \to h_c \, π\, π$ processes employing the recently proposed Dalitz-plot decomposition approach, which is based on the helicity formalism for…
View article: A dispersive estimate of the $a_0(980)$ contribution to $(g-2)_μ$
A dispersive estimate of the $a_0(980)$ contribution to $(g-2)_μ$ Open
A dispersive implementation of the $a_0(980)$ resonance to $(g-2)_μ$ requires the knowledge of the double-virtual $S$-wave $γ^*γ^*\toπη/ K K(I=1)$ amplitudes. To obtain these amplitudes, we used a modified coupled-channel Muskhelishvili-Om…
View article: Phenomenological model for the $γ^*γ\to ηπ^+ π^-$ reaction in the $f_1(1285)$ energy region
Phenomenological model for the $γ^*γ\to ηπ^+ π^-$ reaction in the $f_1(1285)$ energy region Open
Motivated by the ongoing analysis by the BESIII Collaboration on the single-tagged $e^+e^-\to e^+e^- ηπ^+π^-$ reaction, we present a phenomenological study of the diphoton fusion to $ηπ^+ π^-$, focusing on the production mechanism of the $…
View article: Pion polarizabilities from a dispersive analysis of $γγ\to ππ$
Pion polarizabilities from a dispersive analysis of $γγ\to ππ$ Open
We present results for the charged and neutral pion polarizabilities, obtained through a dispersive analysis of photon-fusion reactions with two pions in the final state. This analysis is motivated by current and future measurements at COM…
View article: Phenomenological model for $γγ^* \to K\bar{K}^*(892)$ constraining the $f_1(1420)$ transition form factor
Phenomenological model for $γγ^* \to K\bar{K}^*(892)$ constraining the $f_1(1420)$ transition form factor Open
We present a phenomenological study of the $γγ^*\to K\bar{K}^*(892)$ process by including the $s$-channel production of the $η(1475)$ and $f_1(1420)$ resonances. The non-resonant channel via $K$- and $K^*$-exchanges is investigated careful…
View article: Dispersive analysis of the $\pi\pi$ and $\pi K$ scattering data
Dispersive analysis of the $\pi\pi$ and $\pi K$ scattering data Open
We present a data-driven analysis of the S-wave $\pi\pi \to \pi\pi\,(I=0,2)$ and $\pi K \to \pi K\,(I=1/2, 3/2)$ reactions using the partial-wave dispersion relation. The contributions from the left-hand cuts are parametrized using the exp…
View article: A dispersive estimate of the <i>a</i><sub>0</sub>(980) contribution to hadronic light-by-light scattering in (𝑔 − 2)<sub><i>µ</i></sub>
A dispersive estimate of the <i>a</i><sub>0</sub>(980) contribution to hadronic light-by-light scattering in (𝑔 − 2)<sub><i>µ</i></sub> Open
A dispersive implementation of the a 0 (980) resonance to (𝑔 − 2) µ requires the knowledge of the double-virtual S -wave γ * γ * → πη / KK¯ I = 1 am plitudes. To obtain these amplitudes we used a modified coupled-channel Muskhelishvili-Omn…
View article: Pion polarizabilities from a dispersive analysis of <i>γγ</i> → <i>ππ</i>
Pion polarizabilities from a dispersive analysis of <i>γγ</i> → <i>ππ</i> Open
We present results for the charged and neutral pion polarizabilities, obtained through a dispersive analysis of photon-fusion reactions with two pions in the final state. This analysis is motivated by current and future measurements at COM…
View article: A dispersive estimate of the $a_0(980)$ contribution to hadronic light-by-light scattering in $(g-2)_μ$
A dispersive estimate of the $a_0(980)$ contribution to hadronic light-by-light scattering in $(g-2)_μ$ Open
A dispersive implementation of the $a_0(980)$ resonance to $(g-2)_μ$ requires the knowledge of the double-virtual $S$-wave $γ^*γ^*\toπη/ K\bar{K}_{I=1}$ amplitudes. To obtain these amplitudes we used a modified coupled-channel Muskhelischv…
View article: The case for an EIC Theory Alliance: Theoretical Challenges of the EIC
The case for an EIC Theory Alliance: Theoretical Challenges of the EIC Open
We outline the physics opportunities provided by the Electron Ion Collider (EIC). These include the study of the parton structure of the nucleon and nuclei, the onset of gluon saturation, the production of jets and heavy flavor, hadron spe…
View article: Analytical dispersive parametrization for elastic scattering of spinless particles
Analytical dispersive parametrization for elastic scattering of spinless particles Open
In this paper, we present an improved parameterization of the elastic scattering of spin-0 particles, which is based on a dispersive representation for the inverse scattering amplitude. Besides being based on well known general principles,…
View article: The Case for an EIC Theory Alliance
The Case for an EIC Theory Alliance Open
This documents outlines the case for the creation of an EIC Theory Alliance. The EIC will be a unique and versatile facility that will enable the understanding of some of the most compelling questions in the physics of the strong nuclear f…
View article: Analytical dispersive parameterization for S-wave $ππ$ and $πK$ scattering
Analytical dispersive parameterization for S-wave $ππ$ and $πK$ scattering Open
In this proceeding, we illustrate the applicability of a new parameterization of the S-wave amplitude on the example of the $ππ\to ππ$ and $πK \to πK $ lattice data ($m_π\sim 240$ MeV) from the HadSpec collaboration. The applied parameteri…
View article: Phenomenological model for the $γγ\to π^+π^-π^0$ reaction
Phenomenological model for the $γγ\to π^+π^-π^0$ reaction Open
We present a phenomenological model for the $γγ\to π^+π^-π^0$ reaction by including the production mechanism of the $a_2(1320)$ resonance, as well as the contributions from the $σ/f_0(500)\, π^0$ and $f_2(1270)\, π^0 $ production channels.…
View article: Analytical dispersive parameterization for elastic scattering of spinless particles
Analytical dispersive parameterization for elastic scattering of spinless particles Open
In this paper, we present an improved parameterization of the elastic scattering of spin-0 particles, which is based on a dispersive representation for the inverse scattering amplitude. Besides being based on well known general principles,…
View article: Snowmass white paper: Need for amplitude analysis in the discovery of new hadrons
Snowmass white paper: Need for amplitude analysis in the discovery of new hadrons Open
We highlight the need for the development of comprehensive amplitude analysis methods to further our understanding of hadron spectroscopy. Reaction amplitudes constrained by first principles of $S$-matrix theory and by QCD phenomenology ar…
View article: Dispersive analysis of the $ππ$ and $πK$ scattering data
Dispersive analysis of the $ππ$ and $πK$ scattering data Open
We present a data-driven analysis of the S-wave $ππ\to ππ\,(I=0,2)$ and $πK \to πK\,(I=1/2, 3/2)$ reactions using the partial-wave dispersion relation. The contributions from the left-hand cuts are parametrized using the expansion in a sui…
View article: Dispersive analysis of the $\gamma\gamma \to D \bar{D}$ data and the confirmation of the $D \bar{D}$ bound state.
Dispersive analysis of the $\gamma\gamma \to D \bar{D}$ data and the confirmation of the $D \bar{D}$ bound state. Open
In this paper, we present a data-driven analysis of the $\gamma\gamma\to D^+D^-$ and $\gamma\gamma\to D^0\bar{D}^0$ reactions from threshold up to 4.0 GeV in the $D\bar{D}$ invariant mass. For the $S$-wave contribution, we adopt a partial-…
View article: Data-driven dispersive analysis of the $\pi \pi$ and $\pi K$ scattering for physical and unphysical pion masses
Data-driven dispersive analysis of the $\pi \pi$ and $\pi K$ scattering for physical and unphysical pion masses Open
We present a data-driven analysis of the resonant S-wave $\pi\pi \to \pi\pi$ and $\pi K \to \pi K$ reactions using the partial-wave dispersion relation. The contributions from the left-hand cuts are accounted for in a model-independent way…
View article: Light-by-light scattering sum rule for radiative transitions of bottomonia
Light-by-light scattering sum rule for radiative transitions of bottomonia Open
We generalize a forward light-by-light scattering sum rule to the case of heavy quarkonium radiative transitions. We apply such sum rule to the bottomonium states, and use available data on radiative transitions in its evaluation. For the …
View article: $ω\to 3π$ and $ωπ^{0}$ transition form factor revisited
$ω\to 3π$ and $ωπ^{0}$ transition form factor revisited Open
In light of recent experimental results, we revisit the dispersive analysis of the $ω\to 3π$ decay amplitude and of the $ωπ^0$ transition form factor. Within the framework of the Khuri-Treiman equations, we show that the $ω\to 3π$ Dalitz-p…
View article: Light-by-light scattering sum rule for bottomonia radiative transitions
Light-by-light scattering sum rule for bottomonia radiative transitions Open
We generalize a forward light-by-light scattering sum rule to the case of heavy quarkonia radiative transitions. We apply such sum rule to the bottomonia states, and use available data on radiative transitions in its evaluation. For the tr…
View article: Dispersive analysis of the $γ^{*}γ^{*} \to ππ$ process
Dispersive analysis of the $γ^{*}γ^{*} \to ππ$ process Open
In this paper, we present a dispersive analysis of the double-virtual photon-photon scattering to two pions up to 1.5 GeV. Through unitarity, this process is very sensitive to hadronic final state interaction. For the $s$-wave, we use a co…
View article: Theoretical analysis of the <i>γγ</i><sup>(*)</sup> → <i>π</i><sup>0</sup><i>η</i> process
Theoretical analysis of the <i>γγ</i><sup>(*)</sup> → <i>π</i><sup>0</sup><i>η</i> process Open
The theoretical analysis of the γγ → π 0 η process is presented within the energy range up to 1.4 GeV. The S -wave resonance a 0 (980) is described involving the coupled channel dispersive framework and the D -wave a 2 (1320) is approximat…