Self-assessment

Maltman, Mark

doi:10.1111/j.2044-3862.2009.tb00409.x

Cited by 2 publications

(2 citation statements)

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“…which thus represents an upper bound for this coupling in the present model. For comparison, based on QCD sum rules, values in the range [0.8 − 1.6] MeV have been quoted [83,84]. In the same framework, it was found in ref.…”

Section: Results For F ηπmentioning

confidence: 69%

Analyticity of $$\eta \pi $$ η π isospin-violating form factors and the $$\tau \rightarrow \eta \pi \nu $$ τ → η π ν second-class decay

Descotes-Genon

Moussallam

2014

Eur. Phys. J. C

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We consider the evaluation of the ηπ isospinviolating vector and scalar form factors relying on a systematic application of analyticity and unitarity, combined with chiral expansion results. It is argued that the usual analyticity properties do hold (i.e. no anomalous thresholds are present) in spite of the instability of the η meson in QCD. Unitarity relates the vector form factor to the ηπ → ππ amplitude: we exploit progress in formulating and solving the KhuriTreiman equations for η → 3π and in experimental measurements of the Dalitz plot parameters to evaluate the shape of the ρ-meson peak. Observing this peak in the energy distribution of the τ → ηπν decay would be a background-free signature of a second-class amplitude. The scalar form factor is also estimated from a phase dispersive representation using a plausible model for the ηπ elastic scattering S-wave phase shift and a sum rule constraint in the inelastic region. We indicate how a possibly exotic nature of the a 0 (980) scalar meson manifests itself in a dispersive approach. A remark is finally made on a second-class amplitude in the τ → ππν decay.

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Section: Results For F ηπmentioning

confidence: 69%

Analyticity of $$\eta \pi $$ η π isospin-violating form factors and the $$\tau \rightarrow \eta \pi \nu $$ τ → η π ν second-class decay

Descotes-Genon

Moussallam

2014

Eur. Phys. J. C

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“…In Ref. [19] we evaluated them on the basis of the linear σ-model in the case of f 0 meson [33,34] and with the help of the QCD sum rules for a 0 meson [35]. The result is [19]:…”

Section: B Meson Exchange Mechanismmentioning

confidence: 99%

Limits on lepton flavor violation fromμ−−e−conversion

et al. 2013

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We revisit the status of Lepton Flavor Violating (LFV) µeqq contact interactions from the view point of µ − − e − -conversion in nuclei. We consider their contribution to this LFV process via the two mechanisms on the hadronic level: direct nucleon and meson exchange ones. In the former case the quarks are embedded directly into the nucleons while in the latter in mesons which then interact with nucleons in a nucleus. We revise and in some cases reevaluate the hadronic parameters relevant for both mechanisms and calculate the contribution of the above mentioned contact interactions in coherent µ − − e − -conversion in various nuclei. Then we update our previous upper bounds and derive new ones for the scales of the µeqq contact interactions from the experimental limits on the capture rates of µ − − e − -conversion. We compare these limits with the ones derived in the literature from other LFV processes and comment on the prospects of LHC searches related to the contact µeqq interactions.

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Self-assessment

Cited by 2 publications

References 0 publications

Analyticity of $$\eta \pi $$ η π isospin-violating form factors and the $$\tau \rightarrow \eta \pi \nu $$ τ → η π ν second-class decay

Analyticity of $$\eta \pi $$ η π isospin-violating form factors and the $$\tau \rightarrow \eta \pi \nu $$ τ → η π ν second-class decay

Limits on lepton flavor violation fromμ−−e−conversion

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