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| Main Authors: | , , , |
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| Format: | Preprint |
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2025
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| Online Access: | https://arxiv.org/abs/2501.09699 |
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| _version_ | 1866908387376103424 |
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| author | Cappiello, Luigi Leutgeb, Josef Mager, Jonas Rebhan, Anton |
| author_facet | Cappiello, Luigi Leutgeb, Josef Mager, Jonas Rebhan, Anton |
| contents | Despite the prominence of tensor mesons in photon-photon collisions, until recently their contribution to the hadronic light-by-light (HLbL) scattering part of the anomalous magnetic moment of the muon has been estimated to be at the level of only a few $10^{-12}$. A recent reanalysis within the dispersive approach has found that after resolving the issue of kinematic singularities in previous approaches, a larger result is obtained, a few $10^{-11}$, and with opposite sign as in previous results, when a simple quark model for the transition form factors is employed. In this paper, we present the first complete evaluation of tensor meson contributions within a hard-wall model in holographic QCD, which reproduces surprisingly well mass, two-photon width, and the observed singly virtual transition form factors of the dominant $f_2(1270)$. Due to a second structure function that is absent in the quark model and in lowest-order resonance chiral theory, the result for $a_μ$ turns out to be positive instead of negative, and also with a magnitude of a few $10^{-11}$. We find that the infinite tower of tensor mesons permits to fill the gap in the symmetric longitudinal short-distance constraint on the HLbL amplitude left by the contribution of axial vector mesons. Matching the corresponding leading-order OPE result leads to two-photon couplings consistent with the observed combined effects of the ground-state $f_2,a_2,f_2'$ multiplet and a total $a_μ^\mathrm{Tensor}$ contribution of $+12.4\times 10^{-11}$; with an $F_ρ$ fit this is reduced slightly to $+11.1\times 10^{-11}$. A contribution of this size from the tensor sector could explain the tension between the most recent dispersive and lattice results for $a_μ^\mathrm{HLbL}$. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2501_09699 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Tensor meson transition form factors in holographic QCD and the muon $g-2$ Cappiello, Luigi Leutgeb, Josef Mager, Jonas Rebhan, Anton High Energy Physics - Phenomenology Despite the prominence of tensor mesons in photon-photon collisions, until recently their contribution to the hadronic light-by-light (HLbL) scattering part of the anomalous magnetic moment of the muon has been estimated to be at the level of only a few $10^{-12}$. A recent reanalysis within the dispersive approach has found that after resolving the issue of kinematic singularities in previous approaches, a larger result is obtained, a few $10^{-11}$, and with opposite sign as in previous results, when a simple quark model for the transition form factors is employed. In this paper, we present the first complete evaluation of tensor meson contributions within a hard-wall model in holographic QCD, which reproduces surprisingly well mass, two-photon width, and the observed singly virtual transition form factors of the dominant $f_2(1270)$. Due to a second structure function that is absent in the quark model and in lowest-order resonance chiral theory, the result for $a_μ$ turns out to be positive instead of negative, and also with a magnitude of a few $10^{-11}$. We find that the infinite tower of tensor mesons permits to fill the gap in the symmetric longitudinal short-distance constraint on the HLbL amplitude left by the contribution of axial vector mesons. Matching the corresponding leading-order OPE result leads to two-photon couplings consistent with the observed combined effects of the ground-state $f_2,a_2,f_2'$ multiplet and a total $a_μ^\mathrm{Tensor}$ contribution of $+12.4\times 10^{-11}$; with an $F_ρ$ fit this is reduced slightly to $+11.1\times 10^{-11}$. A contribution of this size from the tensor sector could explain the tension between the most recent dispersive and lattice results for $a_μ^\mathrm{HLbL}$. |
| title | Tensor meson transition form factors in holographic QCD and the muon $g-2$ |
| topic | High Energy Physics - Phenomenology |
| url | https://arxiv.org/abs/2501.09699 |