Bottomonium and B results from full lattice QCD

C. T.H. Davies; B. Colquhoun; B. Galloway; G. C. Donald; J. Koponen; R. J. Dowdall; R. Horgan; E. Follana; G. P. Lepage; C. Mcneile

Bottomonium and B results from full lattice QCD

C. T.H. Davies
, B. Colquhoun
, B. Galloway
, G. C. Donald
, J. Koponen
, R. J. Dowdall
, R. Horgan
, E. Follana
, G. P. Lepage
, C. Mcneile

University of Glasgow
University of Cambridge
University of Zaragoza
Cornell University

Research output: Contribution to journal › Conference proceedings published in a journal › peer-review

Abstract

We have developed two methods for handling b quarks in lattice QCD. One uses NRQCD (now improved to include radiative corrections) and the other uses Highly Improved Staggered Quarks (HISQ), extrapolating to the b quark from lighter masses and using multiple lattice spacings to control discretisation errors. Comparison of results for the two different methods gives confidence in estimates of lattice QCD systematic errors, since they are very different in these two cases. Here we show results for heavyonium hyperfine splittings and vector current-current correlator moments using HISQ quarks, to add to earlier results testing the heavy HISQ method with pseudoscalar mesons. We also show the form factor for B → πlv decay at zero recoil using NRQCD b quarks and u=d quarks with physical masses. This allows us to test the soft pion theorem relation ( f_B(q² _max) = f_B= f_π ) accurately and we find good agreement as M_π →0.

Original language	English
Article number	438
Journal	Proceedings of Science
Volume	29-July-2013
Publication status	Published - 2013
Event	31st International Symposium on Lattice Field Theory, LATTICE 2013 - Mainz, Germany Duration: 29 Jul 2013 → 3 Aug 2013

ASJC Scopus subject areas

Multidisciplinary

Cite this

@article{4a9cf867d87947cbaacbc646d9220632,

title = "Bottomonium and B results from full lattice QCD",

abstract = "We have developed two methods for handling b quarks in lattice QCD. One uses NRQCD (now improved to include radiative corrections) and the other uses Highly Improved Staggered Quarks (HISQ), extrapolating to the b quark from lighter masses and using multiple lattice spacings to control discretisation errors. Comparison of results for the two different methods gives confidence in estimates of lattice QCD systematic errors, since they are very different in these two cases. Here we show results for heavyonium hyperfine splittings and vector current-current correlator moments using HISQ quarks, to add to earlier results testing the heavy HISQ method with pseudoscalar mesons. We also show the form factor for B → πlv decay at zero recoil using NRQCD b quarks and u=d quarks with physical masses. This allows us to test the soft pion theorem relation ( fB(q2 max) = fB= fπ ) accurately and we find good agreement as Mπ →0.",

author = "Davies, \{C. T.H.\} and B. Colquhoun and B. Galloway and Donald, \{G. C.\} and J. Koponen and Dowdall, \{R. J.\} and R. Horgan and E. Follana and Lepage, \{G. P.\} and C. Mcneile",

year = "2013",

language = "English",

volume = "29-July-2013",

journal = "Proceedings of Science",

issn = "1824-8039",

publisher = "Sissa Medialab Srl",

note = "31st International Symposium on Lattice Field Theory, LATTICE 2013 ; Conference date: 29-07-2013 Through 03-08-2013",

}

TY - JOUR

T1 - Bottomonium and B results from full lattice QCD

AU - Davies, C. T.H.

AU - Colquhoun, B.

AU - Galloway, B.

AU - Donald, G. C.

AU - Koponen, J.

AU - Dowdall, R. J.

AU - Horgan, R.

AU - Follana, E.

AU - Lepage, G. P.

AU - Mcneile, C.

PY - 2013

Y1 - 2013

N2 - We have developed two methods for handling b quarks in lattice QCD. One uses NRQCD (now improved to include radiative corrections) and the other uses Highly Improved Staggered Quarks (HISQ), extrapolating to the b quark from lighter masses and using multiple lattice spacings to control discretisation errors. Comparison of results for the two different methods gives confidence in estimates of lattice QCD systematic errors, since they are very different in these two cases. Here we show results for heavyonium hyperfine splittings and vector current-current correlator moments using HISQ quarks, to add to earlier results testing the heavy HISQ method with pseudoscalar mesons. We also show the form factor for B → πlv decay at zero recoil using NRQCD b quarks and u=d quarks with physical masses. This allows us to test the soft pion theorem relation ( fB(q2 max) = fB= fπ ) accurately and we find good agreement as Mπ →0.

AB - We have developed two methods for handling b quarks in lattice QCD. One uses NRQCD (now improved to include radiative corrections) and the other uses Highly Improved Staggered Quarks (HISQ), extrapolating to the b quark from lighter masses and using multiple lattice spacings to control discretisation errors. Comparison of results for the two different methods gives confidence in estimates of lattice QCD systematic errors, since they are very different in these two cases. Here we show results for heavyonium hyperfine splittings and vector current-current correlator moments using HISQ quarks, to add to earlier results testing the heavy HISQ method with pseudoscalar mesons. We also show the form factor for B → πlv decay at zero recoil using NRQCD b quarks and u=d quarks with physical masses. This allows us to test the soft pion theorem relation ( fB(q2 max) = fB= fπ ) accurately and we find good agreement as Mπ →0.

UR - https://www.scopus.com/pages/publications/84976330205

M3 - Conference proceedings published in a journal

AN - SCOPUS:84976330205

SN - 1824-8039

VL - 29-July-2013

JO - Proceedings of Science

JF - Proceedings of Science

M1 - 438

T2 - 31st International Symposium on Lattice Field Theory, LATTICE 2013

Y2 - 29 July 2013 through 3 August 2013

ER -

Bottomonium and B results from full lattice QCD

Abstract

ASJC Scopus subject areas

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Bottomonium and B results from full lattice QCD

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