Determination of | Vus | from a lattice QCD calculation of the K → π ℓ ν Semileptonic form factor with physical quark masses

A. Bazavov; C. Bernard; C. M. Bouchard; C. Detar; Daping Du; A. X. El-Khadra; J. Foley; E. D. Freeland; E. Gámiz; Steven Gottlieb; U. M. Heller; Jongjeong Kim; A. S. Kronfeld; J. Laiho; L. Levkova; P. B. Mackenzie; E. T. Neil; M. B. Oktay; Si Wei Qiu; J. N. Simone; R. Sugar; D. Toussaint; R. S. Van De Water; Ran Zhou

doi:10.1103/PhysRevLett.112.112001

Determination of | V_us | from a lattice QCD calculation of the K → π ℓ ν Semileptonic form factor with physical quark masses

A. Bazavov, C. Bernard, C. M. Bouchard, C. Detar, Daping Du, A. X. El-Khadra, J. Foley, E. D. Freeland, E. Gámiz, Steven Gottlieb, U. M. Heller, Jongjeong Kim, A. S. Kronfeld, J. Laiho, L. Levkova, P. B. Mackenzie, E. T. Neil, M. B. Oktay, Si Wei Qiu, J. N. SimoneR. Sugar, D. Toussaint, R. S. Van De Water, Ran Zhou

Department of Physics

Research output: Contribution to journal › Article › peer-review

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Abstract

We calculate the kaon semileptonic form factor f+(0) from lattice QCD, working, for the first time, at the physical light-quark masses. We use gauge configurations generated by the MILC Collaboration with Nf=2+1+1 flavors of sea quarks, which incorporate the effects of dynamical charm quarks as well as those of up, down, and strange. We employ data at three lattice spacings to extrapolate to the continuum limit. Our result, f+(0)=0.9704(32), where the error is the total statistical plus systematic uncertainty added in quadrature, is the most precise determination to date. Combining our result with the latest experimental measurements of K semileptonic decays, one obtains the Cabibbo-Kobayashi-Maskawa matrix element |Vus|=0.22290(74)(52), where the first error is from f+(0) and the second one is from experiment. In the first-row test of Cabibbo-Kobayashi-Maskawa unitarity, the error stemming from |Vus| is now comparable to that from |Vud|.

Original language	English (US)
Article number	112001
Journal	Physical Review Letters
Volume	112
Issue number	11
DOIs	https://doi.org/10.1103/PhysRevLett.112.112001
State	Published - Mar 17 2014

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General Physics and Astronomy

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10.1103/PhysRevLett.112.112001

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Bazavov, A., Bernard, C., Bouchard, C. M., Detar, C., Du, D., El-Khadra, A. X., Foley, J., Freeland, E. D., Gámiz, E., Gottlieb, S., Heller, U. M., Kim, J., Kronfeld, A. S., Laiho, J., Levkova, L., Mackenzie, P. B., Neil, E. T., Oktay, M. B., Qiu, S. W., ... Zhou, R. (2014). Determination of | V_us | from a lattice QCD calculation of the K → π ℓ ν Semileptonic form factor with physical quark masses. Physical Review Letters, 112(11), Article 112001. https://doi.org/10.1103/PhysRevLett.112.112001

Bazavov, A, Bernard, C, Bouchard, CM, Detar, C, Du, D, El-Khadra, AX, Foley, J, Freeland, ED, Gámiz, E, Gottlieb, S, Heller, UM, Kim, J, Kronfeld, AS, Laiho, J, Levkova, L, Mackenzie, PB, Neil, ET, Oktay, MB, Qiu, SW, Simone, JN, Sugar, R, Toussaint, D, Van De Water, RS & Zhou, R 2014, 'Determination of | V_us | from a lattice QCD calculation of the K → π ℓ ν Semileptonic form factor with physical quark masses', Physical Review Letters, vol. 112, no. 11, 112001. https://doi.org/10.1103/PhysRevLett.112.112001

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title = "Determination of | Vus | from a lattice QCD calculation of the K → π ℓ ν Semileptonic form factor with physical quark masses",

abstract = "We calculate the kaon semileptonic form factor f+(0) from lattice QCD, working, for the first time, at the physical light-quark masses. We use gauge configurations generated by the MILC Collaboration with Nf=2+1+1 flavors of sea quarks, which incorporate the effects of dynamical charm quarks as well as those of up, down, and strange. We employ data at three lattice spacings to extrapolate to the continuum limit. Our result, f+(0)=0.9704(32), where the error is the total statistical plus systematic uncertainty added in quadrature, is the most precise determination to date. Combining our result with the latest experimental measurements of K semileptonic decays, one obtains the Cabibbo-Kobayashi-Maskawa matrix element |Vus|=0.22290(74)(52), where the first error is from f+(0) and the second one is from experiment. In the first-row test of Cabibbo-Kobayashi-Maskawa unitarity, the error stemming from |Vus| is now comparable to that from |Vud|.",

author = "A. Bazavov and C. Bernard and Bouchard, {C. M.} and C. Detar and Daping Du and El-Khadra, {A. X.} and J. Foley and Freeland, {E. D.} and E. G{\'a}miz and Steven Gottlieb and Heller, {U. M.} and Jongjeong Kim and Kronfeld, {A. S.} and J. Laiho and L. Levkova and Mackenzie, {P. B.} and Neil, {E. T.} and Oktay, {M. B.} and Qiu, {Si Wei} and Simone, {J. N.} and R. Sugar and D. Toussaint and {Van De Water}, {R. S.} and Ran Zhou",

year = "2014",

month = mar,

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doi = "10.1103/PhysRevLett.112.112001",

language = "English (US)",

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T1 - Determination of | Vus | from a lattice QCD calculation of the K → π ℓ ν Semileptonic form factor with physical quark masses

AU - Bazavov, A.

AU - Bernard, C.

AU - Bouchard, C. M.

AU - Detar, C.

AU - Du, Daping

AU - El-Khadra, A. X.

AU - Foley, J.

AU - Freeland, E. D.

AU - Gámiz, E.

AU - Gottlieb, Steven

AU - Heller, U. M.

AU - Kim, Jongjeong

AU - Kronfeld, A. S.

AU - Laiho, J.

AU - Levkova, L.

AU - Mackenzie, P. B.

AU - Neil, E. T.

AU - Oktay, M. B.

AU - Qiu, Si Wei

AU - Simone, J. N.

AU - Sugar, R.

AU - Toussaint, D.

AU - Van De Water, R. S.

AU - Zhou, Ran

PY - 2014/3/17

Y1 - 2014/3/17

N2 - We calculate the kaon semileptonic form factor f+(0) from lattice QCD, working, for the first time, at the physical light-quark masses. We use gauge configurations generated by the MILC Collaboration with Nf=2+1+1 flavors of sea quarks, which incorporate the effects of dynamical charm quarks as well as those of up, down, and strange. We employ data at three lattice spacings to extrapolate to the continuum limit. Our result, f+(0)=0.9704(32), where the error is the total statistical plus systematic uncertainty added in quadrature, is the most precise determination to date. Combining our result with the latest experimental measurements of K semileptonic decays, one obtains the Cabibbo-Kobayashi-Maskawa matrix element |Vus|=0.22290(74)(52), where the first error is from f+(0) and the second one is from experiment. In the first-row test of Cabibbo-Kobayashi-Maskawa unitarity, the error stemming from |Vus| is now comparable to that from |Vud|.

AB - We calculate the kaon semileptonic form factor f+(0) from lattice QCD, working, for the first time, at the physical light-quark masses. We use gauge configurations generated by the MILC Collaboration with Nf=2+1+1 flavors of sea quarks, which incorporate the effects of dynamical charm quarks as well as those of up, down, and strange. We employ data at three lattice spacings to extrapolate to the continuum limit. Our result, f+(0)=0.9704(32), where the error is the total statistical plus systematic uncertainty added in quadrature, is the most precise determination to date. Combining our result with the latest experimental measurements of K semileptonic decays, one obtains the Cabibbo-Kobayashi-Maskawa matrix element |Vus|=0.22290(74)(52), where the first error is from f+(0) and the second one is from experiment. In the first-row test of Cabibbo-Kobayashi-Maskawa unitarity, the error stemming from |Vus| is now comparable to that from |Vud|.

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Determination of | V_us | from a lattice QCD calculation of the K → π ℓ ν Semileptonic form factor with physical quark masses

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