Asymmetry observables and the origin of RD(*) anomalies
Abstract
The RD(*) anomalies are among the longest-standing and most statistically significant hints of physics beyond the standard model. Many models have been proposed to explain these anomalies, including the interesting possibility that right-handed neutrinos could be involved in the B decays. In this paper, we investigate future measurements at Belle II that can be used to tell apart the various new physics scenarios. Focusing on a number of τ asymmetry observables (forward-backward asymmetry and polarization asymmetries) which can be reconstructed at Belle II, we calculate the contribution of the most general dimension 6 effective Hamiltonian (including right-handed neutrinos) to all of these asymmetries. We show that Belle II can use these asymmetries to distinguish between new-physics scenarios that use right- and left-handed neutrinos, and in most cases can likely distinguish the specific model itself.
- Publication:
-
Physical Review D
- Pub Date:
- February 2019
- DOI:
- 10.1103/PhysRevD.99.035015
- arXiv:
- arXiv:1810.06597
- Bibcode:
- 2019PhRvD..99c5015A
- Keywords:
-
- High Energy Physics - Phenomenology
- E-Print:
- 28 pages+appendices, 10 figures. v2: typos fixed, references added, some constraints and the list of viable models updated