Tensor Meson Pole contributions to the HLbL piece of $a_{\mu }$ within R$\chi$T

Abstract

We compute the tensor meson pole contributions to the Hadronic Light-by-Light piece of $a_{\mu }$ in the purely hadronic region, using Resonance Chiral Theory. Given the differences between the dispersive and holographic groups determinations, we consider timely to present an alternative evaluation. In our approach, the lightest tensor meson nonet and two vector meson resonance nonets are considered in the chiral limit. Disregarding operators with derivatives, only the form factor ${\mathcal{F}}_1^T$ is non-vanishing, as assumed in the dispersive study. All parameters are determined by imposing a set of short-distance QCD constraints, and the radiative decay widths. In this case, we obtain (in units of $10^{-11}$): $a_2$-pole: $-\left(1.02(10{)}_{\mathrm{stat}}{(}_{-0.12}^{+0.00}{)}_{\mathrm{syst}}\right)$, $f_2$-pole: $-\left(3.2(3{)}_{\mathrm{stat}}{(}_{-0.4}^{+0.0}{)}_{\mathrm{syst}}\right)$ and $f_2^{\prime }$-pole: $-\left(0.042(13{)}_{\mathrm{stat}}\right)$, which add up to $a_{\mu }^{a_2+f_2+f_2^{\prime }-\mathrm{pole}}=-\left(4.3_{-0.5}^{+0.3}\right)$, in close agreement with the holographic result when truncated to ${\mathcal{F}}_1^T$ only. However, with an ad-hoc extended Lagrangian, that also generates ${\mathcal{F}}_3^T$, as in the holographic approach, we have found: $a_2$-pole: $+0.47(1.43{)}_{\mathrm{norm}}(3{)}_{\mathrm{stat}}{(}_{-0.00}^{+0.06}{)}_{\mathrm{syst}}$, $f_2$-pole: $+1.18(4.18{)}_{\mathrm{norm}}(12{)}_{\mathrm{stat}}{(}_{-0.00}^{+0.24}{)}_{\mathrm{syst}}$ and $f_2^{\prime }$-pole: $+0.040(78{)}_{\mathrm{norm}}(2{)}_{\mathrm{stat}}$, summing to $a_{\mu }^{a_2+f_2+f_2^{\prime }-\mathrm{pole}}=+1.7(4.4)$, which agree with these recent determinations within uncertainties (dominated by the ${\mathcal{F}}_3^T$ normalization). We point out that $R\chi T$ generates all form factors, the contributions to $a_{\mu }$ of ${\mathcal{F}}_{2,4,5}$ cannot be evaluated in the current basis, preventing for the moment a complete calculation of $a_{\mu }^{\mathrm{T}-\mathrm{poles}}$ within our framework.

arXiv commentREVTEX, 27 pages, 8 figures, 2 tables. Mass corrections included and code error corrected in TFF3. Appendix for the computation of TFF3 at zero virtuality within R$\chi$T included. Version accepted for publication in JHEP

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Cited by in corpus (1)

• Hadronic contributions to $a_{\mu }$ within Resonance Chiral Theory