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• W3164484440 abstract "The generic Hidden Local Symmetry (HLS) model has given rise to the BHLS$_2$ variant which introduces symmetry breaking in the vector meson sector; the central mechanism is a modification of the covariant derivative at the root of the HLS approach. However, the description of the Belle $tau$ dipion spectra is not satisfactory whereas the dealing with its annihilation sector ($e^+ e^- rightarrow pi^+ pi^-/pi^+ pi^-pi^0/ pi^0 gamma/eta gamma/K^+ K^-/K_L K_S$) is optimum. This issue is solved by an additional breaking term allowing to include the $[pi^0,eta,eta^prime]$ system. This extension of the usual 't~Hooft determinant term only affects the BHLS$_2$ kinetic energy term. One obtains a fair account for the $tau$ dipion spectra as well as for the annihilation channels. The Belle dipion spectrum provides evidence for a violation of CVC in the $tau$ lepton decay; this evidence is strengthened by imposing the conditions $<0|J_mu^q |[q^prime overline{q^prime}](p)>=ip_mu f_q delta_{q q^prime }, { [q overline{q}], q=u,d,s}$ on BHLS$_2$ axial current matrix elements. BHLS$_2$ is found to recover the usual (completed) formulae for the [$pi^0,~eta,~eta^prime$] mixing parameters and the global fits return mixing parameter values in agreement with expectations and better uncertainties. Updating the muon HVP, one argues that the strong tension between the KLOE and BaBar pion form factors imposes to provide two solutions : $a_mu^{HVP-LO}({rm KLOE})=687.31 pm 2.93$ and $a_mu^{HVP-LO}({rm BaBar})=692.36 pm 2.95$, in units of $10^{-10}$, rather than some combination of these. Taking into account common systematics, their differences with the experimental BNL-FNAL average value exhibit significances $> 5.4sigma$ (KLOE) and $> 4.1sigma$ (BaBar) with fit probabilities favoring the former." @default.
• W3164484440 created "2021-06-07" @default.
• W3164484440 creator A5036458739 @default.
• W3164484440 creator A5074785208 @default.
• W3164484440 creator A5089703486 @default.
• W3164484440 date "2022-02-01" @default.
• W3164484440 modified "2023-10-10" @default.
• W3164484440 title "BHLS$$_2$$ upgrade: $$tau $$ spectra, muon HVP and the [$$pi ^0,~eta ,~{eta ^prime }$$] system" @default.
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