Towards testing $(g-2)_τ$ in $e^+e^-\toτ^+τ^-$: radiative corrections and projections for Belle II
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| Format: | Preprint |
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2025
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| _version_ | 1866912487326089216 |
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| author | Gogniat, Joël Hoferichter, Martin Ulrich, Yannick |
| author_facet | Gogniat, Joël Hoferichter, Martin Ulrich, Yannick |
| contents | The arguably most promising avenue towards testing physics beyond the Standard Model in the anomalous magnetic moment of the $τ$ proceeds via suitably constructed asymmetries in $e^+e^-\toτ^+τ^-$ in the presence of a polarized electron beam. Such a program, as could be realized at Belle II assuming a polarization upgrade of the SuperKEKB $e^+e^-$ collider, crucially relies on a careful consideration of radiative corrections. In this work, we present the complete one-loop result for the fully polarized $e^+e^-\toτ^+τ^-$ process and its implementation in the Monte-Carlo integrator McMule. As an application, we discuss projections relevant for measurements at Belle II, both with and without electron polarization, and outline the necessary steps for a generalization to next-to-next-to-leading order. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2505_09678 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Towards testing $(g-2)_τ$ in $e^+e^-\toτ^+τ^-$: radiative corrections and projections for Belle II Gogniat, Joël Hoferichter, Martin Ulrich, Yannick High Energy Physics - Phenomenology High Energy Physics - Experiment Nuclear Theory The arguably most promising avenue towards testing physics beyond the Standard Model in the anomalous magnetic moment of the $τ$ proceeds via suitably constructed asymmetries in $e^+e^-\toτ^+τ^-$ in the presence of a polarized electron beam. Such a program, as could be realized at Belle II assuming a polarization upgrade of the SuperKEKB $e^+e^-$ collider, crucially relies on a careful consideration of radiative corrections. In this work, we present the complete one-loop result for the fully polarized $e^+e^-\toτ^+τ^-$ process and its implementation in the Monte-Carlo integrator McMule. As an application, we discuss projections relevant for measurements at Belle II, both with and without electron polarization, and outline the necessary steps for a generalization to next-to-next-to-leading order. |
| title | Towards testing $(g-2)_τ$ in $e^+e^-\toτ^+τ^-$: radiative corrections and projections for Belle II |
| topic | High Energy Physics - Phenomenology High Energy Physics - Experiment Nuclear Theory |
| url | https://arxiv.org/abs/2505.09678 |