On the Discrepancy between the FOPT and CIPT Approaches for Hadronic Tau Spectral Function Moments
- Author(s)
- Andre H. Hoang, Christoph Regner
- Abstract
The discrepancy between the FOPT and CIPT approaches for hadronic $\tau$ spectral function moments constitutes the major theoretical uncertainty for strong coupling determinations from tau decay data. We show the discrepancy can be analytically understood since the Borel representations -- which have been assumed to be identical for both approaches previously -- differ in the presence of IR renormalons. This implies that the OPE condensate corrections are different for both approaches and that the discrepancy may eventually be reconciled. In the talk we explain the difference and some mathematical aspects of of the FOPT and CIPT Borel representations and show numerical results.
- Organisation(s)
- Particle Physics, Research Platform Erwin Schrödinger International Institute for Mathematics and Physics
- Journal
- SciPost Physics
- Volume
- 7
- No. of pages
- 14
- ISSN
- 2542-4653
- DOI
- https://doi.org/10.48550/arXiv.2111.00252
- Publication date
- 10-2021
- Peer reviewed
- Yes
- Austrian Fields of Science 2012
- 103012 High energy physics, 103034 Particle physics
- Keywords
- Portal url
- https://ucrisportal.univie.ac.at/en/publications/f3b2a7b0-d479-4043-8d7f-c663aac21466