Tau properties in B→D[tau nu] from visible final-state kinematics
In semileptonic B decays with a tau lepton, features of the production process are imprinted on the tau helicity states. Since the tau momentum cannot be fully reconstructed experimentally, the available information on the tau properties is encoded in its visible decay products. Focusing on the proc...
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| Main Authors: | , , |
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| Format: | Article (Journal) |
| Language: | English |
| Published: |
31 May 2017
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| In: |
Physical review
Year: 2017, Volume: 95, Issue: 9 |
| ISSN: | 2470-0029 |
| DOI: | 10.1103/PhysRevD.95.093006 |
| Online Access: | Verlag, Volltext: http://dx.doi.org/10.1103/PhysRevD.95.093006 Verlag, Volltext: https://link.aps.org/doi/10.1103/PhysRevD.95.093006 
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| Author Notes: | Rodrigo Alonso, Jorge Martin Camalich, and Susanne Westhoff |
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| 520 | |a In semileptonic B decays with a tau lepton, features of the production process are imprinted on the tau helicity states. Since the tau momentum cannot be fully reconstructed experimentally, the available information on the tau properties is encoded in its visible decay products. Focusing on the process B→Dτν, we find explicit relations between the tau properties and the kinematics of the charged particles in the decays τ→πν, τ→ρν, and τ→ℓν¯ν. In particular, we show that the perpendicular polarization P⊥ and the forward-backward asymmetry Aτ of the tau lepton can simultaneously be extracted from an angular asymmetry of the charged particle against the D meson. For the most sensitive decay channel, τ→πν, we expect a relative statistical precision of about 10% for P⊥ and Aτ in a measurement based on 50 ab−1 of data at Belle II. | ||
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