Alexandrou, C.; Bacchio, S.; Bergner, G.; Dimopoulos, P.; Finkenrath, J.; Frezzotti, R.; Garofalo, M.; Kostrzewa, B.; Koutsou, G.; Labus, P.; Sanfilippo, F.; Simula, S.; Ueding, M.; Urbach, C.; Wenger, Urs (2021). Ratio of kaon and pion leptonic decay constants with N f = 2 + 1 + 1 Wilson-clover twisted-mass fermions. Physical review. D - particles, fields, gravitation, and cosmology, 104(7), 074520. American Physical Society 10.1103/PhysRevD.104.074520
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We present a determination of the ratio of kaon and pion leptonic decay constants in isosymmetric QCD (ISOQCD), fK/fπ, making use of the gauge ensembles produced by the Extended Twisted Mass Collaboration with Nf = 2 + 1 + 1 flavors of Wilson-clover twisted-mass quarks, including configurations close to the physical point for all dynamical flavors. The simulations are carried out at
three values of the lattice spacing ranging from ∼0.068 to ∼0.092 fm with linear lattice size up to L ∼ 5.5 fm. The scale is set by the particle data group (PDG) value of the pion decay constant, fISOQCD π = 130.4(2) MeV, at the ISOQCD pion point, MISOQCD π = 135.0(2) MeV, obtaining for the gradient-flow scales the values w0 = 0.17383(63) fm, .....t0 = 0.14436(61) fm and t0/w0 =
0.11969(62) fm. The data are analyzed within the framework of SU(2) chiral perturbation theory without resorting to the use of renormalized quark masses. At the ISOQCD kaon point MISOQCD K = 494.2(4) MeV we get (fK/fπ)ISOQCD = 1.1995(44), where the error includes both statistical and systematic uncertainties. Implications for the Cabibbo-Kobayashi-Maskawa matrix element jVusj and for the first-row Cabibbo-Kobayashi-Maskawa unitarity are discussed.
Item Type: |
Journal Article (Original Article) |
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Division/Institute: |
08 Faculty of Science > Institute of Theoretical Physics 10 Strategic Research Centers > Albert Einstein Center for Fundamental Physics (AEC) |
UniBE Contributor: |
Wenger, Urs |
Subjects: |
500 Science > 530 Physics |
ISSN: |
1550-7998 |
Publisher: |
American Physical Society |
Language: |
English |
Submitter: |
Esther Fiechter |
Date Deposited: |
29 Dec 2021 14:24 |
Last Modified: |
05 Dec 2022 15:55 |
Publisher DOI: |
10.1103/PhysRevD.104.074520 |
ArXiv ID: |
2104.06747 |
BORIS DOI: |
10.48350/161992 |
URI: |
https://boris.unibe.ch/id/eprint/161992 |
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