Radiative corrections to double-Dalitz decays revisited

Kampf, Karol; Novotný, Jiří; Sánchez-Puertas, Pablo

doi:10.1103/physrevd.97.056010

Cited by 22 publications

(40 citation statements)

References 48 publications

(88 reference statements)

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“…3 E c = m P (1 − x 4 )/2 and x 4 = p 2 4 m −2 P . For relating to different x 4 values, we refer to [23]. 4 For details on results for each contribution separated, we refer to [23].…”

Section: Numerical Resultsmentioning

confidence: 99%

“…For relating to different x 4 values, we refer to [23]. 4 For details on results for each contribution separated, we refer to [23]. (1)10 −5 5.120(1)10 −5 4.436(1)10 −6 1.851(1)10 −9 5.202(1)10 −5 5.393(1)10 −6 10.289(2)10 −9 Table 1: Numerical results for the radiative corrections (second row).…”

Section: Numerical Resultsmentioning

confidence: 99%

“…At LO, the amplitude for double-Dalitz decays (P → + − + − ) reads where the phase-space variables {s i j , y i j , φ }, and also λ (i j) , have been defined in [23,22]. Such result is modified at higher orders in QED.…”

Section: Full Nlo Analysismentioning

confidence: 99%

“…Concerning the second one, while we agree on the expression for F 2 , we find differences with respect to the resulting matrix element squared. While its impact on the total branching ratio (BR) is negligible [23], it might affect (softly) the differential distributions. Regarding the vacuum polarization, we find good agreement.…”

Section: Full Nlo Analysismentioning

confidence: 99%

“…For details on the phase space for P → ¯ ¯ , we refer to[23], while for the e + e − → e + e − P process we employ that in Refs [31,32]. …”

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confidence: 99%

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The radiative corrections to double-Dalitz decays revisited

Sánchez-Puertas¹

2020

Proceedings of the 9th International Workshop on Chiral Dynamics — PoS(CD2018)

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We revise the radiative corrections to double-Dalitz decays (P → ¯ ¯ ), completing the full nextto-leading order calculation in QED as compared to existing calculations. As a result, we find mild differences with respect to previous studies, that might be relevant for extracting information about the mesons transition form factors. The latter play an important role in determining the hadronic light-by-light contribution to the anomalous magnetic moment of the muon. Finally, we outline an ongoing extension of this work to the e + e − → e + e − P processes.

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“…3 E c = m P (1 − x 4 )/2 and x 4 = p 2 4 m −2 P . For relating to different x 4 values, we refer to [23]. 4 For details on results for each contribution separated, we refer to [23].…”

Section: Numerical Resultsmentioning

confidence: 99%

Section: Numerical Resultsmentioning

confidence: 99%

Section: Full Nlo Analysismentioning

confidence: 99%

Section: Full Nlo Analysismentioning

confidence: 99%

“…For details on the phase space for P → ¯ ¯ , we refer to[23], while for the e + e − → e + e − P process we employ that in Refs [31,32]. …”

mentioning

confidence: 99%

See 3 more Smart Citations

The radiative corrections to double-Dalitz decays revisited

Sánchez-Puertas¹

2020

Proceedings of the 9th International Workshop on Chiral Dynamics — PoS(CD2018)

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CP violation in η muonic decays

Sánchez-Puertas

2019

J. High Energ. Phys.

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In this study, we investigate the imprints of CP violation in certain η muonic decays that could arise within the Standard Model effective field theory. In particular, we study the sensitivities that could be reached at REDTOP, a proposed η facility. After estimating the bounds that the neutron EDM places, we find still viable to discover signals of CP violation measuring the polarization of muons in η → µ + µ − decays, with a single effective operator as its plausible source. * psanchez@ifae.es

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Pseudoscalar pole light-by-light contributions to the muon (g − 2) in resonance chiral theory

Guevara

Roig²,

Sanz-Cillero

2018

J. High Energ. Phys.

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We have studied the P → γ ⋆ γ ⋆ transition form-factors (P = π 0 , η, η ′ ) within a chiral invariant framework that allows us to relate the three form-factors and evaluate the corresponding contributions to the muon anomalous magnetic moment aµ = (gµ − 2)/2, through pseudoscalar pole contributions. We use a chiral invariant Lagrangian to describe the interactions between the pseudo-Goldstones from the spontaneous chiral symmetry breaking and the massive meson resonances. We will consider just the lightest vector and pseudoscalar resonance multiplets. Photon interactions and U (3) flavor breaking effects are accounted for in this covariant framework. This article studies the most general corrections of order m 2 P within this setting. Requiring short-distance constraints fixes most of the parameters entering the form-factors, consistent with previous determinations. The remaining ones are obtained from a fit of these form-factors to experimental measurements in the space-like (q 2 ≤ 0) region of photon momenta. No time-like observable is included in our fits. The combination of data, chiral symmetry relations between form-factors and high-energy constraints allows us to determine with improved precision the on-shell Ppole contribution to the Hadronic Light-by-Light scattering of the muon anomalous magnetic moment: we obtain a P,HLbL µ = (8.47 ± 0.16) · 10 −10 for our best fit. This result was obtained excluding BaBar π 0 data, which our analysis finds in conflict with the remaining experimental inputs. This study also allows us to determine the parameters describing the η − η ′ system in the two-mixing angle scheme and their correlations. Finally, a preliminary rough estimate of the impact of loop corrections (1/NC ) and higher vector multiplets (asym) enlarges the uncertainty up to a P,HLbL µ = ( 8.47 ± 0.16sta ± 0.09 1/N C +0.5 −0 asym ) · 10 −10 . Conclusions 36A Wess-Zumino-Witten Lagrangian 38 B The P form-factor in the evaluation of a HLbL µ 38 C Additional information on the fit correlations 401 The same deviation is quoted in the updated analysis of the leading hadronic vacuum polarization contribution in ref.[17], while it is 3.7σ according to the most recent study in [18]. See ref.[19] for a discussion on the Monte Carlo needs for these accurate predictions.2 Also lattice QCD simulations have recently managed to give accurate determinations. See, e.g., refs. [25].3 This dominance is not fully understood from a first-principles derivation [32,33].

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Radiative corrections to double-Dalitz decays revisited

Cited by 22 publications

References 48 publications

The radiative corrections to double-Dalitz decays revisited

The radiative corrections to double-Dalitz decays revisited

CP violation in η muonic decays

Pseudoscalar pole light-by-light contributions to the muon (g − 2) in resonance chiral theory

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