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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| Format: | Article |
| Language: | English |
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SpringerOpen
2025-07-01
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| Series: | Journal of High Energy Physics |
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| Online Access: | https://doi.org/10.1007/JHEP07(2025)172 |
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| author | Joël Gogniat Martin Hoferichter Yannick Ulrich |
| author_facet | Joël Gogniat Martin Hoferichter Yannick Ulrich |
| author_sort | Joël Gogniat |
| collection | DOAJ |
| description | 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. |
| format | Article |
| id | doaj-art-82c73f7c80c149a591d38bfa3c0f1797 |
| institution | Kabale University |
| issn | 1029-8479 |
| language | English |
| publishDate | 2025-07-01 |
| publisher | SpringerOpen |
| record_format | Article |
| series | Journal of High Energy Physics |
| spelling | doaj-art-82c73f7c80c149a591d38bfa3c0f17972025-08-20T04:01:43ZengSpringerOpenJournal of High Energy Physics1029-84792025-07-012025713410.1007/JHEP07(2025)172Towards testing (g − 2) τ in e + e − → τ + τ −: radiative corrections and projections for Belle IIJoël Gogniat0Martin Hoferichter1Yannick Ulrich2Albert Einstein Center for Fundamental Physics, Institute for Theoretical Physics, University of BernAlbert Einstein Center for Fundamental Physics, Institute for Theoretical Physics, University of BernDepartment of Mathematical Sciences, University of LiverpoolAbstract 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.https://doi.org/10.1007/JHEP07(2025)172Electroweak Precision PhysicsPrecision QEDElectric Dipole Moments |
| spellingShingle | Joël Gogniat Martin Hoferichter Yannick Ulrich Towards testing (g − 2) τ in e + e − → τ + τ −: radiative corrections and projections for Belle II Journal of High Energy Physics Electroweak Precision Physics Precision QED Electric Dipole Moments |
| title | Towards testing (g − 2) τ in e + e − → τ + τ −: radiative corrections and projections for Belle II |
| title_full | Towards testing (g − 2) τ in e + e − → τ + τ −: radiative corrections and projections for Belle II |
| title_fullStr | Towards testing (g − 2) τ in e + e − → τ + τ −: radiative corrections and projections for Belle II |
| title_full_unstemmed | Towards testing (g − 2) τ in e + e − → τ + τ −: radiative corrections and projections for Belle II |
| title_short | Towards testing (g − 2) τ in e + e − → τ + τ −: radiative corrections and projections for Belle II |
| title_sort | towards testing g 2 τ in e e τ τ radiative corrections and projections for belle ii |
| topic | Electroweak Precision Physics Precision QED Electric Dipole Moments |
| url | https://doi.org/10.1007/JHEP07(2025)172 |
| work_keys_str_mv | AT joelgogniat towardstestingg2tineettradiativecorrectionsandprojectionsforbelleii AT martinhoferichter towardstestingg2tineettradiativecorrectionsandprojectionsforbelleii AT yannickulrich towardstestingg2tineettradiativecorrectionsandprojectionsforbelleii |