B. Colquhoun

activity

20112025

most citedThe Upsilon spectrum and the determination of the lattice spacing from lattice QCD including charm quarks in the sea

151 citations · 756 across the 21 of their papers we have counts for

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24 papers · 1 filter

hep-lat2025

New high-precision $b$ , $c$ , and $s$ masses from pseudoscalar-pseudoscalar correlators in $n_{f} = 4$ lattice QCD

Brian Colquhoun, Christine T. H. Davies, Daniel Hatton +1

We extend an earlier lattice QCD analysis of heavy-quark current-current correlators to obtain new values for the $MS$ masses of the $b$ , $c$ , and $s$ ~quarks. T…

hep-lat2025★ 2 cited

Constraints on axion-like particles using lattice QCD calculations of the rate for $J / ψ \to γ a$

Brian Colquhoun, Christine T. H. Davies, G. Peter Lepage +1

A key search mode for axion-like particles (ALPs) that couple to charm quarks is $J / ψ \to γ a$ . Here we calculate the form factor that allows the rate of this process to be determine…

hep-lat2024

Precise prediction of the decay rate for $η_{b} \to γ γ$ from lattice QCD

Brian Colquhoun, Christine T. H. Davies, G. Peter Lepage

We calculate the decay rate for $η_{b} \to γ γ$ in lattice QCD for the first time, providing a precise prediction for the Belle II experiment. Our calculation includes $u$ , $d$ , $s$ a…

hep-lat2024

Improved analysis of strong-interaction-stable doubly-bottom tetraquarks on the lattice

B. Colquhoun, A. Francis, R. J. Hudspith +3

We update earlier lattice results for the binding energies of the flavor antitriplet of strong-interaction-stable doubly bottom, $J^{P} = 1^{+}$ tetraquarks, employing an extended sink c…

hep-lat2023★ 24 cited

Precise determination of decay rates for $η_{c} \to γ γ$ , $J / ψ \to γ η_{c}$ and $J / ψ \to η_{c} e^{+} e^{-}$ from lattice QCD

Brian Colquhoun, Laurence J. Cooper, Christine T. H. Davies +1

We calculate the decay rates for $η_{c} \to γ γ$ , $J / ψ \to γ η_{c}$ and $J / ψ \to η_{c} e^{+} e^{-}$ in lattice QCD with $u$ , $d$ , $s$ and $c$ quarks in the sea for the first time. We improve sign…

hep-lat2022★ 39 cited

Form factors of $B \to π ℓ ν$ and a determination of $∣ V_{u b} ∣$ with Möbius domain-wall-fermions

Brian Colquhoun, Shoji Hashimoto, Takashi Kaneko +1

Using a fully relativistic lattice fermion action, we compute the form factors of the semileptonic decay $B \to π ℓ ν$ , which is required for the determination of the Cabibbo-Kobaya…

hep-lat2021★ 1 cited

$B \to D^{(*)} ℓ ν$ semileptonic decays in lattice QCD with domain-wall heavy quarks

T. Kaneko, Y. Aoki, B. Colquhoun +5

We calculate the $B \to D^{(*)} ℓ ν$ form factors in 2+1 flavor relativistic lattice QCD by employing the Möbius domain-wall action for all quark flavors. Our simulations are ca…

hep-lat2020★ 80 cited

A lattice investigation of exotic tetraquark channels

R. J. Hudspith, B. Colquhoun, A. Francis +2

We perform an $n_{f} = 2 + 1$ lattice study of a number of channels where past claims exist in the literature for the existence of strong-interaction-stable light-heavy tetraquarks. We f…

hep-lat2020

$B \to π ℓ ν$ form factors and $∣ V_{u b} ∣$ with Möbius domain wall fermions

Brian Colquhoun, Shoji Hashimoto, Takashi Kaneko +1

We report on a calculation of form factors for the semileptonic decay of $B$ meson to pion on $2 + 1$ -flavour lattices with lattice spacings from 0.080 fm down to 0.044 fm. Using the…

hep-lat2019★ 1 cited

$B \to D^{(*)} ℓ ν$ form factors from lattice QCD with relativistic heavy quarks

T. Kaneko, Y. Aoki, G. Bailas +4

We report on our calculation of the B \to D^(*) \ell νform factors in 2+1 flavor lattice QCD. The Möbius domain-wall action is employed for light, strange, charm and bottom quarks.…

hep-lat2018

$B_{c}$ spectroscopy using highly improved staggered quarks

Andrew Lytle, Brian Colquhoun, Christine Davies +1

We report on a calculation of $B_{c}$ ground state and radial excitation energies, obtained from heavy-charm highly improved staggered quark (HISQ) correlators computed on MILC gauge…

hep-lat2018

$B \to D^{(*)} ℓ ν$ form factors from $N_{f} = 2 + 1$ QCD with Möbius domain-wall quarks

Takashi Kaneko, Yasumichi Aoki, Brian Colquhoun +2

We report on our study of the B \to D^(*) \ell νsemileptonic decays at zero and nonzero recoils in 2+1 flavor QCD. The Möbius domain-wall action is employed for light, charm and bo…

hep-lat2018

Heavy quark scaling of $B \to π ℓ ν$ form factors with Möbius domain wall fermions

Brian Colquhoun, Shoji Hashimoto, Takashi Kaneko

We report on the progress of our calculation of form factors for the exclusive semileptonic decay of $B$ mesons to pions on $2 + 1$ flavour lattices with spacings from $0.080~\mathrm…

hep-lat2017★ 9 cited

D meson semileptonic form factors in Nf=3 QCD with Möbius domain-wall quarks

Takashi Kaneko, Brian Colquhoun, Hidenori Fukaya +1

We present our calculation of D \to pi and D \to K semileptonic form factors in Nf = 2+1 lattice QCD. We simulate three lattice cutoffs 1/a \sim 2.5, 3.6 and 4.5 GeV with pion mass…

hep-lat2017

The $B_{(s)} \to D_{(s)} l ν$ Decay with Highly Improved Staggered Quarks and NRQCD

Euan McLean, Christine T. H. Davies, Brian Colquhoun +1

We report on progress of a lattice QCD calculation of the $B \to D l ν$ and $B_{s} \to D_{s} l ν$ semileptonic form factors. We use a relativistic staggered action (HISQ) for light and char…

hep-lat2017

$B \to π ℓ ν$ with Möbius Domain Wall Fermions

Brian Colquhoun, Shoji Hashimoto, Takashi Kaneko

We report on the status of our calculation of the exclusive semileptonic decay, $B \to π ℓ ν$ ; a key process in the determination of the CKM matrix element $∣ V_{u b} ∣$ . The…

hep-lat2016★ 4 cited

$B_{c}$ decays from highly improved staggered quarks and NRQCD

Brian Colquhoun, Christine Davies, Jonna Koponen +2

We calculate semileptonic form factors for the decays $B_{c} \to η_{c} l ν$ and $B_{c} \to J / ψ l ν$ over the entire $q^{2}$ range, using a highly improved lattice quark action for cha…

hep-lat2016

Semileptonic $B_{c}$ decays from full lattice QCD

Andrew Lytle, Brian Colquhoun, Christine Davies +2

We present first lattice QCD results for semileptonic form factors for the decays $B_{c} \to η_{c} l ν$ and $B_{c} \to J / ψ l ν$ over the full $q^{2}$ range, using both improved non-relativi…

hep-lat2015

Phenomenology with Lattice NRQCD b Quarks

Brian Colquhoun, Christine T. H. Davies, Rachel J. Dowdall +3

The HPQCD collaboration has used radiatively-improved NonRelativistic QCD (NRQCD) for $b$ quarks in bottomonium to determine the decay rate of $Υ$ and $Υ^{'}$ mesons to leptons…

hep-lat2015★ 32 cited

$B \to π ℓ ν$ at zero recoil from lattice QCD with physical $u / d$ quarks

B. Colquhoun, R. J. Dowdall, J. Koponen +2

The exclusive semileptonic decay $B \to π ℓ ν$ is a key process for the determination of the Cabibbo-Kobayashi-Maskawa matrix element $V_{u b}$ from the comparison of expe…

hep-lat2015★ 144 cited

B-meson decay constants: a more complete picture from full lattice QCD

B. Colquhoun, C. T. H. Davies, R. J. Dowdall +4

We extend the picture of $B$ -meson decay constants obtained in lattice QCD beyond those of the $B$ , $B_{s}$ and $B_{c}$ to give the first full lattice QCD results for the $B^{*}$ , $B^*_s…

hep-lat2014★ 102 cited

The $Υ$ and $Υ^{'}$ Leptonic Widths, $a_{μ}^{b}$ and $m_{b}$ from full lattice QCD

B. Colquhoun, R. J. Dowdall, C. T. H. Davies +2

We determine the decay rate to leptons of the ground-state $Υ$ meson and its first radial excitation in lattice QCD for the first time. We use radiatively-improved NRQCD for the $b…

hep-lat2013★ 3 cited

Bottomonium and B results from full lattice QCD

C. T. H. Davies, B. Colquhoun, B. Galloway +7

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 Qu…

hep-lat2011★ 151 cited

The Upsilon spectrum and the determination of the lattice spacing from lattice QCD including charm quarks in the sea

R. J. Dowdall, B. Colquhoun, J. O. Daldrop +8

We give results for the Upsilon spectrum from lattice QCD using an improved version of the NRQCD action for b quarks which includes radiative corrections to kinetic terms at O(v^4)…

New high-precision b, c, and s masses from pseudoscalar-pseudoscalar correlators in nf​=4 lattice QCD

Constraints on axion-like particles using lattice QCD calculations of the rate for J/ψ→γa

Precise prediction of the decay rate for ηb​→γγ from lattice QCD

Improved analysis of strong-interaction-stable doubly-bottom tetraquarks on the lattice

Precise determination of decay rates for ηc​→γγ, J/ψ→γηc​ and J/ψ→ηc​e+e− from lattice QCD

Form factors of B→πℓν and a determination of ∣Vub​∣ with Möbius domain-wall-fermions

B→D(∗)ℓν semileptonic decays in lattice QCD with domain-wall heavy quarks

A lattice investigation of exotic tetraquark channels

B→πℓν form factors and ∣Vub​∣ with Möbius domain wall fermions

B→D(∗)ℓν form factors from lattice QCD with relativistic heavy quarks

Bc​ spectroscopy using highly improved staggered quarks

B→D(∗)ℓν form factors from Nf​=2+1 QCD with Möbius domain-wall quarks

Heavy quark scaling of B→πℓν form factors with Möbius domain wall fermions

D meson semileptonic form factors in Nf=3 QCD with Möbius domain-wall quarks

The B(s)​→D(s)​lν Decay with Highly Improved Staggered Quarks and NRQCD

B→πℓν with Möbius Domain Wall Fermions

Bc​ decays from highly improved staggered quarks and NRQCD

Semileptonic Bc​ decays from full lattice QCD

Phenomenology with Lattice NRQCD b Quarks

B→πℓν at zero recoil from lattice QCD with physical u/d quarks

B-meson decay constants: a more complete picture from full lattice QCD

The Υ and Υ′ Leptonic Widths, aμb​ and mb​ from full lattice QCD

Bottomonium and B results from full lattice QCD

The Upsilon spectrum and the determination of the lattice spacing from lattice QCD including charm quarks in the sea

New high-precision $b$ , $c$ , and $s$ masses from pseudoscalar-pseudoscalar correlators in $n_{f} = 4$ lattice QCD

Constraints on axion-like particles using lattice QCD calculations of the rate for $J / ψ \to γ a$

Precise prediction of the decay rate for $η_{b} \to γ γ$ from lattice QCD

Precise determination of decay rates for $η_{c} \to γ γ$ , $J / ψ \to γ η_{c}$ and $J / ψ \to η_{c} e^{+} e^{-}$ from lattice QCD

Form factors of $B \to π ℓ ν$ and a determination of $∣ V_{u b} ∣$ with Möbius domain-wall-fermions

$B \to D^{(*)} ℓ ν$ semileptonic decays in lattice QCD with domain-wall heavy quarks

$B \to π ℓ ν$ form factors and $∣ V_{u b} ∣$ with Möbius domain wall fermions

$B \to D^{(*)} ℓ ν$ form factors from lattice QCD with relativistic heavy quarks

$B_{c}$ spectroscopy using highly improved staggered quarks

$B \to D^{(*)} ℓ ν$ form factors from $N_{f} = 2 + 1$ QCD with Möbius domain-wall quarks

Heavy quark scaling of $B \to π ℓ ν$ form factors with Möbius domain wall fermions

The $B_{(s)} \to D_{(s)} l ν$ Decay with Highly Improved Staggered Quarks and NRQCD

$B \to π ℓ ν$ with Möbius Domain Wall Fermions

$B_{c}$ decays from highly improved staggered quarks and NRQCD

Semileptonic $B_{c}$ decays from full lattice QCD

$B \to π ℓ ν$ at zero recoil from lattice QCD with physical $u / d$ quarks

The $Υ$ and $Υ^{'}$ Leptonic Widths, $a_{μ}^{b}$ and $m_{b}$ from full lattice QCD