Addendum to: Light-cone distribution amplitudes of pseudoscalar mesons from lattice QCD

Bali, Gunnar; Braun, Vladimir M.; Bürger, Simon; Göckeler, M.; Gruber, Michael; Hutzler, Fabian; Korcyl, Piotr; Schäfer, Andreas; Sternbeck, André; Wein, Philipp

doi:10.1007/jhep11(2020)037

Cited by 29 publications

(34 citation statements)

References 2 publications

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“…To this end, we determine the following nonperturbative parameters: A best fit to the 1σ and 2σ error ellipses of the data up to 3.1 GeV 2 is given in [1] with χ 2 ndf = 0.38. It provides agreement with the N 3 LO lattice constraints from [25] and yields b 2 (µ 2 0 ) = 0.159, which corresponds to b 4 (µ 2 0 ) = −0.098 if depicted within the BMS domain. Note that the platykurtic (pk) range of pion DA's [26,27] lies entirely within the 1σ error ellipse of this data set and is close to the NNLO lattice strip [25].…”

Section: Phenomenological Analysissupporting

confidence: 71%

“…It provides agreement with the N 3 LO lattice constraints from [25] and yields b 2 (µ 2 0 ) = 0.159, which corresponds to b 4 (µ 2 0 ) = −0.098 if depicted within the BMS domain. Note that the platykurtic (pk) range of pion DA's [26,27] lies entirely within the 1σ error ellipse of this data set and is close to the NNLO lattice strip [25]. .…”

Section: Phenomenological Analysissupporting

confidence: 71%

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Improved calculation of the γ*γ → π process at low Q² using LCSR’s and renormalization-group summation

Михайлов¹,

Pimikov²,

Stefanis

2022

EPJ Web Conf.

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We study two versions of lightcone sum rules to calculate the γ*γ → π0 transition form factor (TFF) within QCD. While the standard version is based on fixed-order perturbation theory by means of a power-series expansion in the strong coupling, the new method incorporates radiative corrections by renormalization-group summation and generates an expansion within a generalized fractional analytic perturbation theory involving only analytic couplings. Using this scheme, we determine the relative nonperturbative parameters and the first two Gegenbauer coefficients of the pion distribution amplitude (DA) to obtain TFF predictions in good agreement with the preliminary BESIII data, while the best-fit pion DA satisfies the most recent lattice constraints on the second moment of the pion DA at the three-loop level.

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Section: Phenomenological Analysissupporting

confidence: 71%

Section: Phenomenological Analysissupporting

confidence: 71%

Improved calculation of the γ*γ → π process at low Q² using LCSR’s and renormalization-group summation

Михайлов¹,

Pimikov²,

Stefanis

2022

EPJ Web Conf.

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“…2. lattice results: a ρ 2 = 0.184(18)(33), a π 2 = 0.140(24) > a r 2 = 0.069 (0.074) at µ 2 = 1 GeV 2 (which are evolved from the values at µ 2 = 4 GeV 2 in [24,25]).…”

Section: Jhep02(2021)197mentioning

confidence: 96%

Correlators of vector, tensor, and scalar composite vertices of order O($$ {\alpha}_{\mathrm{s}}^2 $$β0)

Михайлов¹,

Volchanskiy

2021

J. High Energ. Phys.

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We present analytical results for massless correlators of two vector, tensor, and scalar composite vertices with the Bjorken fractions x and y of order $$ {\alpha}_s^2 $$ α s 2 β0 of QCD. The structure of these correlators ΠV,T,S(x, y; p2) and properties of its main elements are discussed in detail. Special attention is paid to verifying the results and comparing them with known particular cases. We apply the correlators to evaluate radiative corrections to the distribution amplitudes of light mesons within the QCD sum rules.

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“…where the uncertainty is fully dominated by the scale variation m b /2 < µ < 2m b around the central value µ = m b . Here we used the Gegenbauer coefficients from [13] evolved to m b with NLL accuracy. The uncertainty coming from the charm mass is negligible.…”

Section: Jhep10(2021)223mentioning

confidence: 99%

“…Inputs used to obtain QCD NNLO predictions and QED effects. The Gegenbauer coefficients of the π and K are taken from [13] and evolved to 1 GeV with LL accuracy. The ρ and K * Gegenbauer coefficients are taken from [14], which uses Lattice QCD results from [15].…”

Section: Jhep10(2021)223mentioning

confidence: 99%

QED factorization of two-body non-leptonic and semi-leptonic B to charm decays

Beneke

Böer

Finauri

et al. 2021

J. High Energ. Phys.

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The QCD×QED factorization is studied for two-body non-leptonic and semi-leptonic B decays with heavy-light final states. These non-leptonic decays, like $$ {\overline{B}}_{(s)}^0\to {D}_{(s)}^{+}{\pi}^{-} $$ B ¯ s 0 → D s + π − and $$ {\overline{B}}_d^0\to {D}^{+}{K}^{-} $$ B ¯ d 0 → D + K − , are among the theoretically cleanest non-leptonic decays as penguin loops do not contribute and colour-suppressed tree amplitudes are suppressed in the heavy-quark limit or even completely absent. Advancing the theoretical calculations of such decays requires therefore also a careful analysis of QED effects. Including QED effects does not alter the general structure of factorization which is analogous for both semi-leptonic and non-leptonic decays. For the latter, we express our result as a correction of the tree amplitude coefficient a1. At the amplitude level, we find QED effects at the sub-percent level, which is of the same order as the QCD uncertainty. We discuss the phenomenological implications of adding QED effects in light of discrepancies observed between theory and experimental data, for ratios of non-leptonic over semi-leptonic decay rates. At the level of the rate, ultrasoft photon effects can produce a correction up to a few percent, requiring a careful treatment of such effects in the experimental analyses.

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Addendum to: Light-cone distribution amplitudes of pseudoscalar mesons from lattice QCD

Abstract: We update our lattice determination of the two lowest Gegenbauer moments of the leading-twist pion and kaon light-cone distribution amplitudes [1]

Cited by 29 publications

References 2 publications

Improved calculation of the γ*γ → π process at low Q² using LCSR’s and renormalization-group summation

Improved calculation of the γ*γ → π process at low Q² using LCSR’s and renormalization-group summation

Correlators of vector, tensor, and scalar composite vertices of order O($$ {\alpha}_{\mathrm{s}}^2 $$β0)

QED factorization of two-body non-leptonic and semi-leptonic B to charm decays

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Addendum to: Light-cone distribution amplitudes of pseudoscalar mesons from lattice QCD

Abstract: We update our lattice determination of the two lowest Gegenbauer moments of the leading-twist pion and kaon light-cone distribution amplitudes [1]

Cited by 29 publications

References 2 publications

Improved calculation of the γ*γ → π process at low Q2 using LCSR’s and renormalization-group summation

Improved calculation of the γ*γ → π process at low Q2 using LCSR’s and renormalization-group summation

Correlators of vector, tensor, and scalar composite vertices of order O($$ {\alpha}_{\mathrm{s}}^2 $$β0)

QED factorization of two-body non-leptonic and semi-leptonic B to charm decays

Contact Info

Product

Resources

About

Improved calculation of the γ*γ → π process at low Q² using LCSR’s and renormalization-group summation

Improved calculation of the γ*γ → π process at low Q² using LCSR’s and renormalization-group summation