On the scalar $πK$ form factor beyond the elastic region

von Detten, Leon; Noël, Frederic; Hanhart, Christoph; Hoferichter, Martin; Kubis, Bastian

doi:10.48550/arxiv.2103.01966

Cited by 2 publications

(2 citation statements)

References 77 publications

(166 reference statements)

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“…also Refs. [117,118]), which can be summarized as follows: the full scattering amplitude t (s), carrying channel indices i, j, is written as 2 t (s) i j = t(s…”

Section: Appendix A: Coupled-channel Formalismmentioning

confidence: 99%

A dispersive analysis of $$\varvec{\eta '\rightarrow \pi ^+\pi ^-\gamma }$$ and $$\varvec{\eta '\rightarrow \ell ^+\ell ^-\gamma }$$

et al. 2022

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We present a dispersive representation of the $$\eta '$$ η ′ transition form factor that allows one to account, in a consistent way, for the effects of $$\rho $$ ρ –$$\omega $$ ω mixing in both the isoscalar and the isovector contributions. Using this formalism, we analyze recent data on $$\eta '\rightarrow \pi ^+\pi ^-\gamma $$ η ′ → π + π - γ to constrain the isovector part of the form factor, individually and in combination with data for the pion vector form factor, which suggests a tension in the $$\rho $$ ρ –$$\omega $$ ω mixing parameter. As a first application, we use our results, in combination with the most recent input for the isoscalar part of the form factor, to predict the corresponding spectrum of $$\eta '\rightarrow \ell ^+\ell ^-\gamma $$ η ′ → ℓ + ℓ - γ , in particular we find the slope parameter $$b_{\eta '}=1.455(24)\,\text {GeV}^{-2}$$ b η ′ = 1.455 ( 24 ) GeV - 2 . With forthcoming data on the latter process, our results establish the necessary framework to improve the evaluation of the $$\eta '$$ η ′ -pole contribution to the anomalous magnetic moment of the muon using experimental input from both $$\eta '$$ η ′ decay channels.

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“…also Refs. [117,118]), which can be summarized as follows: the full scattering amplitude t (s), carrying channel indices i, j, is written as 2 t (s) i j = t(s…”

Section: Appendix A: Coupled-channel Formalismmentioning

confidence: 99%

A dispersive analysis of $$\varvec{\eta '\rightarrow \pi ^+\pi ^-\gamma }$$ and $$\varvec{\eta '\rightarrow \ell ^+\ell ^-\gamma }$$

et al. 2022

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“…[62]. The case of scalar form-factors, determinant for the RpV MSSM, is far more difficult to systematically address without trusting a specific model [63,64]. Here, we employ the form factors provided by Ref.…”

Section: Semi-leptonic Decaysmentioning

confidence: 99%

Decays of a bino-like particle in the low-mass regime

Domingo¹,

Dreiner²

2022

Preprint

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We study the phenomenology associated with a light bino-like neutralino with mass ă " m τ in the context of the R-parity violating Minimal Supersymmetric Standard Model. This is a well-motivated example of scenarios producing potentially light and long-lived exotic particles, which might be testable in far-detector experiments, such as the FASER experiment at the Large Hadron Collider. A quantitative assessment of the discovery potential or the extraction of limits run through a detailed understanding of the interactions of the light exotic fermion with Standard Model matter, in particular, the hadronic sector. Here, we propose a systematic analysis of the decays of such a particle and proceed to a model-independent derivation of the low-energy effects, so that this formalism may be transposed to other UV-completions or even stand as an independent effective field theory. We then stress the diversity of the possible phenomenology and more specifically discuss the features associated with the R-parity violating supersymmetric framework, for example neutron-antineutron oscillations.

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On the scalar $πK$ form factor beyond the elastic region

Cited by 2 publications

References 77 publications

A dispersive analysis of $$\varvec{\eta '\rightarrow \pi ^+\pi ^-\gamma }$$ and $$\varvec{\eta '\rightarrow \ell ^+\ell ^-\gamma }$$

A dispersive analysis of $$\varvec{\eta '\rightarrow \pi ^+\pi ^-\gamma }$$ and $$\varvec{\eta '\rightarrow \ell ^+\ell ^-\gamma }$$

Decays of a bino-like particle in the low-mass regime

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