New-physics searches in CP -violating η muonic decays

Sánchez-Puertas, Pablo

doi:10.1016/j.nuclphysbps.2021.05.052

Cited by 4 publications

(1 citation statement)

References 21 publications

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“…[102] (bounds from D s decays analyzed in Ref. [105] are similar, but less severe) updated with the most recent nEDM measurement [106]…”

Section: Cp Violation Inmentioning

confidence: 99%

The REDTOP experiment: Rare $\eta/\eta^{\prime}$ Decays To Probe New Physics

Elam¹

2022

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The η and η mesons are nearly unique in the particle universe since they are almost Goldstone bosons and the dynamics of their decays are strongly constrained. The integrated η-meson samples collected in earlier experiments amount to ∼ 10 9 events. A new experiment, REDTOP (Rare Eta Decays To Observe Physics Beyond the Standard Model), is being proposed, with the intent of collecting a data sample of order 10 14 η (10 12 η ) for studying very rare decays. Such statistics are sufficient for investigating several symmetry violations, and for searching for particles and fields beyond the Standard Model. In this work we present several studies evaluating REDTOP sensitivity to processes that couple the Standard Model to New Physics through all four of the so-called portals: the Vector, the Scalar, the Axion and the Heavy Lepton portal. The sensitivity of the experiment is also adequate for probing several conservation laws, in particular CP , T and Lepton Universality, and for the determination of the η form factors, which is crucial for the interpretation of the recent measurement of muon g − 2.

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“…[102] (bounds from D s decays analyzed in Ref. [105] are similar, but less severe) updated with the most recent nEDM measurement [106]…”

Section: Cp Violation Inmentioning

confidence: 99%

The REDTOP experiment: Rare $\eta/\eta^{\prime}$ Decays To Probe New Physics

Elam¹

2022

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New-physics signatures via CP violation in η(′) → π0μ+μ− and η′ → ημ+μ− decays

Escribano

Royo

Sánchez-Puertas

2022

J. High Energ. Phys.

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In this work we investigate the prospect of observing new-physics signatures via CP violation in η(′) → π0μ+μ− and η′ → ημ+μ− decays at the REDTOP experiment. We make use of the SMEFT to parametrise the new-physics CP-violating effects and find that the projected REDTOP statistics are not competitive with respect to nEDM experiments. This reasserts the η → μ+μ− process as the most promising channel to find CP-violation at this experimental facility.

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CP violation in η(′) → π+π−μ+μ− decays

Zillinger

Kubis²,

Sánchez-Puertas

2022

J. High Energ. Phys.

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It has been pointed out recently that a certain set of dimension-6 scalar P- and CP-violating light-quark-muon operators may be tested in η and η′ decays to various final states involving μ+μ− pairs, at a level not yet excluded by constraints from electric dipole moments. We here work out the hadronic matrix elements required for the predictions for the decays η, η′ → π+π−μ+μ−. We relate a new asymmetry in the angular distribution between the dipion and dimuon decay planes to the corresponding Wilson coefficients. Despite the advantage of not requiring the measurement of muon polarization, the projected sensitivities are shown to be moderate due to a combination of small phase space and chiral suppression. Such sensitivity studies are most timely in view of upcoming or planned high-statistics η(′) experiments such as the JLab eta factory or REDTOP.

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New-physics searches in CP -violating η muonic decays

Cited by 4 publications

References 21 publications

The REDTOP experiment: Rare $\eta/\eta^{\prime}$ Decays To Probe New Physics

The REDTOP experiment: Rare $\eta/\eta^{\prime}$ Decays To Probe New Physics

New-physics signatures via CP violation in η(′) → π0μ+μ− and η′ → ημ+μ− decays

CP violation in η(′) → π+π−μ+μ− decays

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