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Novel |Vus | determination using inclusive strange τ decay and lattice Hadronic vacuum polarization functions

Novel |Vus | determination using inclusive strange τ decay and lattice Hadronic vacuum polarization functions
Novel |Vus | determination using inclusive strange τ decay and lattice Hadronic vacuum polarization functions

We propose and apply a new approach to determining |Vus| using dispersion relations with weight functions having poles at Euclidean (spacelike) momentum which relate strange hadronic τ decay distributions to hadronic vacuum polarization (HVP) functions obtained from lattice quantum chromodynamics. We show examples where spectral integral contributions from the region where experimental data have large errors or do not exist are strongly suppressed but accurate determinations of the relevant lattice HVP combinations remain possible. The resulting |Vus| agrees well with determinations from K physics and three-family Cabibbo-Kobayashi-Maskawa unitarity. Advantages of this new approach over the conventional hadronic τ decay determination employing flavor-breaking sum rules are also discussed.

hep-lat, hep-ph
0031-9007
1-6
Boyle, Peter
78a2aebf-aea7-4925-b5df-ead4b4da6fb2
Hudspith, Renwick James
99487280-fa27-4316-b623-e554a30f9b39
Izubuchi, Taku
777b2caf-5063-400b-8f28-864e57938e54
Jüttner, Andreas
a90ff7c5-ae8f-4c8e-9679-b5a95b2a6247
Lehner, Christoph
ca2f6986-c2ac-47b4-87fb-ac9351447244
Lewis, Randy
d44d64c0-7bb0-4f6e-8f84-7a100cd76908
Maltman, Kim
bd206f44-d1cd-4335-8fd2-bd1eaa58ac1e
Ohki, Hiroshi
92eb4a6f-b847-4f59-bb02-6e55961aa1f4
Portelli, Antonin
a2526d4a-144e-4095-802a-229cddb10f0f
Spraggs, Matthew
5683c2e0-0323-44ea-ba21-ba0eaf269e8c
Boyle, Peter
78a2aebf-aea7-4925-b5df-ead4b4da6fb2
Hudspith, Renwick James
99487280-fa27-4316-b623-e554a30f9b39
Izubuchi, Taku
777b2caf-5063-400b-8f28-864e57938e54
Jüttner, Andreas
a90ff7c5-ae8f-4c8e-9679-b5a95b2a6247
Lehner, Christoph
ca2f6986-c2ac-47b4-87fb-ac9351447244
Lewis, Randy
d44d64c0-7bb0-4f6e-8f84-7a100cd76908
Maltman, Kim
bd206f44-d1cd-4335-8fd2-bd1eaa58ac1e
Ohki, Hiroshi
92eb4a6f-b847-4f59-bb02-6e55961aa1f4
Portelli, Antonin
a2526d4a-144e-4095-802a-229cddb10f0f
Spraggs, Matthew
5683c2e0-0323-44ea-ba21-ba0eaf269e8c

Boyle, Peter, Hudspith, Renwick James, Izubuchi, Taku, Jüttner, Andreas, Lehner, Christoph, Lewis, Randy, Maltman, Kim, Ohki, Hiroshi, Portelli, Antonin and Spraggs, Matthew (2018) Novel |Vus | determination using inclusive strange τ decay and lattice Hadronic vacuum polarization functions. Physical Review Letters, 121 (20), 1-6. (doi:10.1103/PhysRevLett.121.202003).

Record type: Article

Abstract

We propose and apply a new approach to determining |Vus| using dispersion relations with weight functions having poles at Euclidean (spacelike) momentum which relate strange hadronic τ decay distributions to hadronic vacuum polarization (HVP) functions obtained from lattice quantum chromodynamics. We show examples where spectral integral contributions from the region where experimental data have large errors or do not exist are strongly suppressed but accurate determinations of the relevant lattice HVP combinations remain possible. The resulting |Vus| agrees well with determinations from K physics and three-family Cabibbo-Kobayashi-Maskawa unitarity. Advantages of this new approach over the conventional hadronic τ decay determination employing flavor-breaking sum rules are also discussed.

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PhysRevLett.121.202003 - Version of Record
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More information

Accepted/In Press date: 16 November 2018
e-pub ahead of print date: 16 November 2018
Published date: 16 November 2018
Keywords: hep-lat, hep-ph

Identifiers

Local EPrints ID: 427009
URI: https://eprints.soton.ac.uk/id/eprint/427009
ISSN: 0031-9007
PURE UUID: c9537279-7502-407b-be1c-5d3bf0182a30

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Date deposited: 20 Dec 2018 17:30
Last modified: 25 Mar 2019 17:30

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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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