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Phenomenology with Lattice NRQCD b Quarks · Around

2015

Phenomenology with Lattice NRQCD b Quarks

Colquhoun, Brian, Davies, Christine T. H., Dowdall, Rachel J. et al.

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The HPQCD collaboration has used radiatively-improved NonRelativistic QCD (NRQCD) for $b$ quarks in bottomonium to determine the decay rate of $\Upsilon$ and $\Upsilon^\prime$ mesons to leptons in lattice QCD.

Using time-moments of vector bottomonium current-current correlators, we are also able to determine the $b$ quark mass in the $\overline{\mathrm{MS}}$ scheme.
We use the same NRQCD $b$ quarks and Highly Improved Staggered Quark (HISQ) light quarks -- with masses down to their physical values -- to give a complete picture of heavy-light meson decay constants including those for vector mesons.
We also study the semileptonic $B\rightarrow\pi\ell\nu$ decay at zero recoil to show that lattice QCD is consistent with the soft pion theorem for this decay: $f_0(q^2_{\mathrm{max}})=f_B/f_\pi$ in the massless pion limit.

Built on

E. Follana et al., Highly improved staggered quarks on the lattice, with applications to charm physics
2007
Earlier work this paper cites.
C. McNeile et al., High-precision c and b masses, and QCD coupling from current-current correlators in lattice and continuum QCD
Original
2010
Earlier work this paper cites.
R. J. Dowdall et al., The Upsilon spectrum and the determination of the lattice spacing from lattice QCD including charm quarks in the sea
Original
2012
Earlier work this paper cites.
C. McNeile et al., Heavy meson masses and decay constants from relativistic heavy quarks in full lattice QCD
Original
2012
Earlier work this paper cites.

Similar

C. McNeile et al., High-precision f B s f_{B_{s}} and HQET from relativistic lattice QCD
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2012
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T. C. Hammant et al., Radiative improvement of the lattice nonrelativistic QCD action using the background field method with applications to quarkonium spectroscopy
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2013
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A. Bazavov et al., Lattice QCD ensembles with four flavors of highly improved staggered quarks
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2013
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R. J. Dowdall et al., B-Meson decay constants from improved lattice nonrelativistic QCD with physical u, d, s, and c quarks
Original
2013
Cited alongside, same era.
B. Colquhoun et al., Υ \Upsilon and Υ ′ \Upsilon^{\prime} leptonic widths, a μ b a_{\mu}^{b} and m b m_{b} from full lattice QCD
Original
Cited in the paper.
B. Colquhoun et al., B → π ℓ ν B\rightarrow\pi\ell\nu at zero recoil from lattice QCD with physical u / d u/d quarks
Original
Cited in the paper.
J. M. Flynn et al., B → π ℓ ν B\to\pi\ell\nu and B s → K ℓ ν B_{s}\to K\ell\nu form factors and | V u b | |V_{ub}| from 2+1-flavor lattice QCD with domain-wall light quarks and relativistic heavy quarks
Original
Cited in the paper.

Then

B. Chakraborty et al., High-precision quark masses and QCD coupling from n f = 4 n_{f}=4 lattice QCD
Original
2015
Closest in time.
B. Colquhoun et al., B-meson decay constants: a more complete picture from full lattice QCD
Original
2015
Closest in time.
J. A. Bailey et al., | V u b | |V_{ub}| from B → π ℓ ν B\to\pi\ell\nu decays and (2+1)-flavor lattice QCD
Original
2015
Closest in time.

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