Running Coupling Constant from Position-Space Current-Current Correlation Functions in Three-Flavor Lattice QCD

Calì, Salvatore; Cichy, Krzysztof; Korcyl, Piotr; Simeth, Jakob

doi:10.1103/physrevlett.125.242002

Cited by 18 publications

(30 citation statements)

References 44 publications

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“…5 Comparison of the Λ-parameter in three-flavor QCD from Refs. [4,[23][24][25][26][27] (from left to right) to the present determination. The result of Ref.…”

Section: Using Thementioning

confidence: 87%

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Strong coupling constant from moments of quarkonium correlators revisited

Petreczky

Weber

2022

Eur. Phys. J. C

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We revisit previous determination of the strong coupling constant from moments of quarkonium correlators in (2 + 1)-flavor QCD. We use previously calculated moments obtained with Highly Improved Staggered Quark (HISQ) action for five different quark masses and several lattice spacings. We perform a careful continuum extrapolations of the moments and from the comparison of these to the perturbative result we determine the QCD Lambda parameter, $$\varLambda _{\overline{MS}}^{n_f=3}=332 \pm 17 \pm 2(scale)$$ Λ MS ¯ n f = 3 = 332 ± 17 ± 2 ( s c a l e ) MeV. This corresponds to $$\alpha _s^{n_f=5}(\mu =M_Z)=0.1177(12)$$ α s n f = 5 ( μ = M Z ) = 0.1177 ( 12 ) .

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“…5 Comparison of the Λ-parameter in three-flavor QCD from Refs. [4,[23][24][25][26][27] (from left to right) to the present determination. The result of Ref.…”

Section: Using Thementioning

confidence: 87%

“…[22] are not shown as these are superseded by Ref. [23] correlator [27]. This comparison is shown Fig.…”

Section: Using Thementioning

confidence: 99%

Strong coupling constant from moments of quarkonium correlators revisited

Petreczky

Weber

2022

Eur. Phys. J. C

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show abstract

“…Comparison of the Λ-parameter in three-flavor QCD from Refs. [4,[22][23][24][25][26] (from left to right) to the present determination. The result of Ref.…”

Section: Determination Of the Strong Coupling Constantmentioning

confidence: 74%

“…This is due to the absence of Bayesian priors and different choices of the renormalization scale µ and not just µ = 3m h . We compare our results for the Λparameter with other three-flavor lattice determinations, namely from the moments of quarkonium correlators [4], from the static quark anti-quark potential [21][22][23], from step-scaling analysis by ALPHA collaboration [24], from ghost-gluon vertex in Landau gauge [25], and from the lightquark vector current correlator [26]. This comparison is shown Fig.…”

Section: Determination Of the Strong Coupling Constantmentioning

confidence: 93%

Strong coupling constant from moments of quarkonium correlators

Petreczky¹

2019

Proceedings of Alphas-2019: Workshop on Precision Measurements of the QCD Coupling Constant — PoS(ALPHAS2019)

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We revisit the previous determination of the strong coupling constant from moments of quarkonium correlators in (2+1)-flavor QCD. We use previously calculated moments obtained with Highly Improved Staggered Quark (HISQ) action for five different quark masses and several lattice spacings. We perform a careful continuum extrapolation of the moments, and from the comparison of these to the perturbative result we determine the QCD Lambda parameter, Λ n f =3 MS = 332 ± 17 ± 2(scale) MeV. This corresponds to α n f =5 s (µ = M Z) = 0.11773(119).

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“…O(α 4 s (ν h )) [453][454][455][456]; further terms are due to nonperturbative contributions. As the window problem is severe, these calculations are very challenging both in momentum space [457][458][459] or in position space [460].…”

Section: A Strong Coupling Calculationsmentioning

confidence: 99%

Snowmass 2021 whitepaper: Proton structure at the precision frontier

Amoroso,

Apyan,

Armesto

et al. 2022

Preprint

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An overwhelming number of theoretical predictions for hadron colliders require parton distribution functions (PDFs), which are an important ingredient of theory infrastructure for the next generation of high-energy experiments. This whitepaper summarizes the status and future prospects for determination of high-precision PDFs applicable in a wide range of energies and experiments, in particular in precision tests of the Standard Model and in new physics searches at the high-luminosity Large Hadron Collider and Electron-Ion Collider. We discuss the envisioned advancements in experimental measurements, QCD theory, global analysis methodology, and computing that are necessary to bring unpolarized PDFs in the nucleon to the N2LO and N3LO accuracy in the QCD coupling strength. Special attention is given to the new tasks that emerge in the era of the precision PDF analysis, such as those focusing on the robust control of systematic factors both in experimental measurements and theoretical computations. Various synergies between experimental and theoretical studies of the hadron structure are explored, including opportunities for studying PDFs for nuclear and meson targets, PDFs with electroweak contributions or dependence on the transverse momentum, for incisive comparisons between phenomenological models for the PDFs and computations on discrete lattice, and for cross-fertilization with machine learning/AI approaches.

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Running Coupling Constant from Position-Space Current-Current Correlation Functions in Three-Flavor Lattice QCD

Cited by 18 publications

References 44 publications

Strong coupling constant from moments of quarkonium correlators revisited

Strong coupling constant from moments of quarkonium correlators revisited

Strong coupling constant from moments of quarkonium correlators

Snowmass 2021 whitepaper: Proton structure at the precision frontier

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