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Simulating rare kaon decays K+→π+ℓ+ℓ− using domain wall lattice QCD with physical light quark masses

Simulating rare kaon decays K+→π+ℓ+ℓ− using domain wall lattice QCD with physical light quark masses
Simulating rare kaon decays K+→π+ℓ+ℓ− using domain wall lattice QCD with physical light quark masses
We report the first calculation using physical light-quark masses of the electromagnetic form factor V(z) describing the long-distance contributions to the K+→π+ℓ+ℓ− decay amplitude. The calculation is performed on a 2+1 flavor domain wall fermion ensemble with inverse lattice spacing a−1=1.730(4)GeV. We implement a Glashow-Iliopoulos-Maiani cancellation by extrapolating to the physical charm-quark mass from three below-charm masses. We obtain V(z=0.013(2))=−0.87(4.44), achieving a bound for the value. The large statistical error arises from stochastically estimated quark loops.
hep-lat, hep-ph
Boyle, P. A.
d2737c8a-ba0a-4adc-9670-77aa7732cdeb
Erben, F.
77ddb031-333a-4703-a306-ad148a612643
Flynn, J. M.
d8e90963-ba56-415c-bbd4-496b7d91d343
Gülpers, Vera
8547047e-ffc3-4a5a-8c75-22dd175ab1b2
Hill, R. C.
32648a2c-42f6-4433-866e-0d40767ee601
Hodgson, R.
db407c84-8e91-4f95-8e23-9e1093656916
Jüttner, A.
a90ff7c5-ae8f-4c8e-9679-b5a95b2a6247
hÓgáin, F. Ó
a05e03d7-6c48-484e-bb96-cabd093f5521
Portelli, A.
a2526d4a-144e-4095-802a-229cddb10f0f
Sachrajda, C. T.
0ed6568b-f52f-4314-8677-4aeeb925d6f7
Boyle, P. A.
d2737c8a-ba0a-4adc-9670-77aa7732cdeb
Erben, F.
77ddb031-333a-4703-a306-ad148a612643
Flynn, J. M.
d8e90963-ba56-415c-bbd4-496b7d91d343
Gülpers, Vera
8547047e-ffc3-4a5a-8c75-22dd175ab1b2
Hill, R. C.
32648a2c-42f6-4433-866e-0d40767ee601
Hodgson, R.
db407c84-8e91-4f95-8e23-9e1093656916
Jüttner, A.
a90ff7c5-ae8f-4c8e-9679-b5a95b2a6247
hÓgáin, F. Ó
a05e03d7-6c48-484e-bb96-cabd093f5521
Portelli, A.
a2526d4a-144e-4095-802a-229cddb10f0f
Sachrajda, C. T.
0ed6568b-f52f-4314-8677-4aeeb925d6f7

[Unknown type: UNSPECIFIED]

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Abstract

We report the first calculation using physical light-quark masses of the electromagnetic form factor V(z) describing the long-distance contributions to the K+→π+ℓ+ℓ− decay amplitude. The calculation is performed on a 2+1 flavor domain wall fermion ensemble with inverse lattice spacing a−1=1.730(4)GeV. We implement a Glashow-Iliopoulos-Maiani cancellation by extrapolating to the physical charm-quark mass from three below-charm masses. We obtain V(z=0.013(2))=−0.87(4.44), achieving a bound for the value. The large statistical error arises from stochastically estimated quark loops.

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2202.08795v3 - Author's Original
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Published date: 17 February 2022
Additional Information: 11 pages, 8 figures
Keywords: hep-lat, hep-ph

Identifiers

Local EPrints ID: 469145
URI: http://eprints.soton.ac.uk/id/eprint/469145
PURE UUID: 6a0d0b7d-dca3-4816-ae28-89a5a6824fac
ORCID for J. M. Flynn: ORCID iD orcid.org/0000-0002-6280-1677
ORCID for A. Jüttner: ORCID iD orcid.org/0000-0002-3978-0927
ORCID for A. Portelli: ORCID iD orcid.org/0000-0002-6059-917X

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Date deposited: 07 Sep 2022 17:38
Last modified: 08 Sep 2022 01:50

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Contributors

Author: P. A. Boyle
Author: F. Erben
Author: J. M. Flynn ORCID iD
Author: Vera Gülpers
Author: R. C. Hill
Author: R. Hodgson
Author: A. Jüttner ORCID iD
Author: F. Ó hÓgáin
Author: A. Portelli ORCID iD
Author: C. T. Sachrajda

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