Towards testing (g − 2) τ in e + e − → τ + τ −: radiative corrections and projections for Belle II
Abstract 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 − → τ + τ − in the presence of a polarized electron beam. Such a program, as could be realized at Belle II as...
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| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
| Published: |
SpringerOpen
2025-07-01
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| Series: | Journal of High Energy Physics |
| Subjects: | |
| Online Access: | https://doi.org/10.1007/JHEP07(2025)172 |
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| Summary: | Abstract 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 − → τ + 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 − → τ + 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. |
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| ISSN: | 1029-8479 |