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| Vus | determination from inclusive strange tau decay and lattice HVP

| Vus | determination from inclusive strange tau decay and lattice HVP
| Vus | determination from inclusive strange tau decay and lattice HVP

We propose and apply a novel approach to determining |Vus| which uses inclusive strange hadronic tau decay data and hadronic vacuum polarization functions (HVPs) computed on the lattice. The experimental and lattice data are related through dispersion relations which employ a class of weight functions having poles at space-like momentum. Implementing this approach using lattice data generated by the RBC/UKQCD collaboration, we show examples of weight functions which strongly suppress spectral integral contributions from the region where experimental data either have large uncertainties or do not exist while at the same time allowing accurate determinations of relevant lattice HVPs. Our result for |Vus| is in good agreement with determinations from K physics and 3-family CKM unitarity. The advantages of the new approach over the conventional sum rule analysis will be discussed.

2101-6275
1-8
Boyle, Peter
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Hudspith, Renwick James
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Izubuchi, Taku
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Jüttner, Andreas
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Lehner, Christoph
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Lewis, Randy
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Maltman, Kim
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Ohki, Hiroshi
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Portelli, Antonin
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Spraggs, Matthew
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Boyle, Peter
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Hudspith, Renwick James
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Izubuchi, Taku
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Jüttner, Andreas
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Lehner, Christoph
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Lewis, Randy
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Maltman, Kim
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Ohki, Hiroshi
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Portelli, Antonin
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Spraggs, Matthew
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Boyle, Peter, Hudspith, Renwick James, Izubuchi, Taku, Jüttner, Andreas, Lehner, Christoph, Lewis, Randy, Maltman, Kim, Ohki, Hiroshi, Portelli, Antonin and Spraggs, Matthew (2018) | Vus | determination from inclusive strange tau decay and lattice HVP. EPJ Web of Conferences, 175, 1-8. (doi:10.1051/epjconf/201817513011).

Record type: Article

Abstract

We propose and apply a novel approach to determining |Vus| which uses inclusive strange hadronic tau decay data and hadronic vacuum polarization functions (HVPs) computed on the lattice. The experimental and lattice data are related through dispersion relations which employ a class of weight functions having poles at space-like momentum. Implementing this approach using lattice data generated by the RBC/UKQCD collaboration, we show examples of weight functions which strongly suppress spectral integral contributions from the region where experimental data either have large uncertainties or do not exist while at the same time allowing accurate determinations of relevant lattice HVPs. Our result for |Vus| is in good agreement with determinations from K physics and 3-family CKM unitarity. The advantages of the new approach over the conventional sum rule analysis will be discussed.

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epjconf_lattice2018_13011
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e-pub ahead of print date: 26 March 2018

Identifiers

Local EPrints ID: 419938
URI: https://eprints.soton.ac.uk/id/eprint/419938
ISSN: 2101-6275
PURE UUID: e53bae34-c274-49f4-8f64-b1e62b1dd57c

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Date deposited: 24 Apr 2018 16:30
Last modified: 13 Mar 2019 18:34

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Contributors

Author: Peter Boyle
Author: Renwick James Hudspith
Author: Taku Izubuchi
Author: Christoph Lehner
Author: Randy Lewis
Author: Kim Maltman
Author: Hiroshi Ohki
Author: Antonin Portelli
Author: Matthew Spraggs

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