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1.
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A non-perturbative determination of $b_{\rm g}$
/ Dalla Brida, Mattia (CERN) ; Knechtli, Francesco (Wuppertal U.) ; Korzec, Tomasz (Wuppertal U.) ; Ramos, Alberto (Valencia U., IFIC) ; Sint, Stefan (TCD, Dublin) ; Sommer, Rainer (Julich, NIC ; DESY ; Humboldt U., Berlin) ; Höllwieser, Roman (Wuppertal U.)
Close to the continuum limit, lattice QCD with mass-degenerate Wilson quarks can be described by Symanzik's effective continuum action, which contains the dimension 5 operator, $m\,{\rm tr}(F_{\mu\nu}F_{\mu\nu})$. Its effect can be eliminated by an O($am_{\rm q}$) rescaling of the bare lattice coupling constant. [...]
arXiv:2401.05791.-
2024-05-02 - 8 p.
- Published in : PoS: LATTICE2023 (2024) , pp. 295
Fulltext: document - PDF; 2401.05791 - PDF;
In : 40th International Symposium on Lattice Field Theory (Lattice 2023), Fermilab, Batavia, IL, United States, 30 Jul - 5 Aug 2023, pp.295
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2.
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Heavy Wilson Quarks and O($a$) Improvement: Nonperturbative Results for $b_{\rm g}$
/ Dalla Brida, Mattia (CERN) ; Höllwieser, Roman (Wuppertal U.) ; Knechtli, Francesco (Wuppertal U.) ; Korzec, Tomasz (Wuppertal U.) ; Sint, Stefan (Hamilton Math. Inst., Dublin) ; Sommer, Rainer (Humboldt U., Berlin)
/ALPHA Collaboration
With Wilson quarks, on-shell O($a$) improvement of the lattice QCD action is achieved by including the Sheikholeslami-Wohlert term and two further operators of mass dimension 5, which amount to a mass-dependent rescaling of the bare parameters. We here focus on the rescaled bare coupling, $\tilde{g}_0^2 = g_0^2(1 + b_{\rm g} am_{\rm q})$, and the determination of $b_{\rm g}(g_0^2)$, which is currently only known to 1-loop order of perturbation theory. [...]
arXiv:2401.00216.-
2024-01-31 - 26 p.
- Published in : JHEP 2024 (2020) 188
Fulltext: 2401.00216 - PDF; document - PDF;
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3.
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Determination of $\alpha _s(m_Z)$ by the non-perturbative decoupling method
/ Dalla Brida, Mattia (CERN) ; Höllwieser, Roman (Wuppertal U.) ; Knechtli, Francesco (Wuppertal U.) ; Korzec, Tomasz (Wuppertal U.) ; Nada, Alessandro (Turin U.) ; Ramos, Alberto (Valencia U., IFIC) ; Sint, Stefan (Hamilton Math. Inst., Dublin) ; Sommer, Rainer (Humboldt U., Berlin ; DESY)
/ALPHA Collaboration
We present the details and first results of a new strategy for the determination of $\alpha_s(m_Z)$. By simultaneously decoupling 3 fictitious heavy quarks we establish a relation between the $\Lambda$-parameters of three-flavor QCD and pure gauge theory. [...]
arXiv:2209.14204; IFIC/22-25; WUB/22-00; DESY-22-051; CERN-TH-2022-015; HU-EP-22/04.-
2022-12-03 - 62 p.
- Published in : Eur. Phys. J. C 82 (2022) 1092
Fulltext: 2209.14204 - PDF; Publication - PDF;
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4.
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Results for $\alpha_s$ from the decoupling strategy
/ Brida, Mattia Dalla (CERN) ; Höllwieser, Roman (Wuppertal U.) ; Knechtli, Francesco (Wuppertal U.) ; Korzec, Tomasz (Wuppertal U.) ; Nada, Alessandro (NIC, Zeuthen) ; Ramos, Alberto (Valencia U., IFIC) ; Sint, Stefan (Trinity Coll., Dublin) ; Sommer, Rainer (NIC, Zeuthen ; Humboldt U., Berlin)
/ALPHA Collaboration
We present analysis details and new results for the strong coupling $\alpha_s(m_Z)$, determined by the decoupling strategy. We measure a massive gradient flow (GF) coupling defined in finite volume with Schrödinger functional (SF) boundary conditions in a theory with $N_\text{f}=3$ degenerate heavy quarks of mass $M$. [...]
arXiv:2112.09623.-
2022-05-16 - 10 p.
- Published in : PoS: LATTICE2021 (2022) , pp. 492
Fulltext: 2112.09623 - PDF; document - PDF;
In : 38th International Symposium on Lattice Field Theory, Online, 26 - 30 Jul 2021, pp.492
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5.
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Scale Setting for CLS 2+1 Simulations
/ Strassberger, Ben (NIC, Zeuthen) ; Cè, Marco (CERN) ; Collins, Sara (Regensburg U.) ; Gérardin, Antoine (Marseille, CPT) ; von Hippel, Georg (Mainz U.) ; Korcyl, Piotr (Jagiellonian U.) ; Korzec, Tomasz (Bergische U., Wuppertal (main)) ; Mohler, Daniel (Darmstadt, GSI) ; Risch, Andreas (NIC, Zeuthen) ; Schaefer, Stefan (NIC, Zeuthen) et al.
We present an update of the scale setting for $N_f=2+1$ flavor QCD using gradient flow scales and pseudo-scalar decay constants. We analyze the latest ensembles with $2+1$ flavors of non-perturbatively improved Wilson fermions generated by CLS for improved precision. [...]
arXiv:2112.06696; DESY-21-175; WUB/21-05.-
2022-05-16 - 10 p.
- Published in : PoS: LATTICE2021 (2022) , pp. 135
Fulltext: document - PDF; 2112.06696 - PDF;
In : 38th International Symposium on Lattice Field Theory, Online, 26 - 30 Jul 2021, pp.135
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6.
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Scale setting for $N_f=3+1$ QCD
/ Höllwieser, Roman (Wuppertal U.) ; Knechtli, Francesco (Wuppertal U.) ; Korzec, Tomasz (Wuppertal U.)
/ALPHA Collaboration
We present the scale setting for a new set of gauge configurations generated with $N_f=3+1$ Wilson quarks with a non-perturbatively determined clover coefficient in a massive O($a$) improvement scheme. The three light quarks are degenerate, with the sum of their masses being equal to its value in nature and the charm quark has its physical mass. [...]
arXiv:2002.02866; WUB/20-00.-
2020-04-30 - 25 p.
- Published in : Eur. Phys. J. C
Article from SCOAP3: PDF; Fulltext: PDF;
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7.
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How perturbative are heavy sea quarks?
/ Athenodorou, Andreas (Cyprus U. ; Cyprus Inst.) ; Finkenrath, Jacob (Cyprus Inst.) ; Knechtli, Francesco (Wuppertal U.) ; Korzec, Tomasz (Wuppertal U.) ; Leder, Björn (Humboldt U., Berlin) ; Krstić Marinković, Marina (Trinity Coll., Dublin) ; Sommer, Rainer (Julich, NIC ; Humboldt U., Berlin)
/ALPHA Collaboration
Effects of heavy sea quarks on the low energy physics are described by an effective theory where the expansion parameter is the inverse quark mass, 1/$M$. At leading order in 1/$M$ (and neglecting light quark masses) the dependence of any low energy quantity on $M$ is given in terms of the ratio of $\Lambda$ parameters of the effective and the fundamental theory. [...]
arXiv:1809.03383; DESY 18-134; HU-EP-18/28; WUB/18-03; DESY-18-134; HU-EP-18-28; WUB-18-03.-
2019-06 - 38 p.
- Published in : Nucl. Phys. B 943 (2019) 114612
Article from SCOAP3: PDF; Fulltext: PDF;
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8.
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A non-perturbative exploration of the high energy regime in $N_\text{f}=3$ QCD
/ Dalla Brida, Mattia (INFN, Milan Bicocca ; Milan Bicocca U.) ; Fritzsch, Patrick (CERN) ; Korzec, Tomasz (Wuppertal U.) ; Ramos, Alberto (Hamilton Math. Inst., Dublin) ; Sint, Stefan (Hamilton Math. Inst., Dublin) ; Sommer, Rainer (NIC, Zeuthen ; Humboldt U., Berlin)
/ALPHA Collaboration
Using continuum extrapolated lattice data we trace a family of running couplings in three-flavour QCD over a large range of scales from about 4 to 128 GeV. The scale is set by the finite space time volume so that recursive finite size techniques can be applied, and Schr\"odinger functional (SF) boundary conditions enable direct simulations in the chiral limit. [...]
arXiv:1803.10230; CERN-TH-2018-060; DESY 18-044; WUB/18-01; DESY-18-044; WUB-18-01.-
2018-05-10 - 40 p.
- Published in : Eur. Phys. J. C 78 (2018) 372
Article from SCOAP3: scoap3-fulltext - PDF; scoap - PDF; Fulltext: PDF;
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9.
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10.
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The strong coupling from a nonperturbative determination of the $\Lambda$ parameter in three-flavor QCD
/ Bruno, Mattia (Brookhaven Natl. Lab.) ; Dalla Brida, Mattia (INFN, Milan Bicocca ; Milan Bicocca U.) ; Fritzsch, Patrick (CERN) ; Korzec, Tomasz (Bergische U., Wuppertal (main)) ; Ramos, Alberto (CERN) ; Schaefer, Stefan (DESY, Zeuthen ; NIC, Zeuthen) ; Simma, Hubert (DESY, Zeuthen ; NIC, Zeuthen) ; Sint, Stefan (Trinity Coll., Dublin) ; Sommer, Rainer (NIC, Zeuthen ; DESY, Zeuthen ; Humboldt U., Berlin)
/ALPHA Collaboration
We present a lattice determination of the $\Lambda$ parameter in three-flavor QCD and the strong coupling at the Z pole mass. Computing the nonperturbative running of the coupling in the range from $0.2\,$GeV to $70\,$GeV, and using experimental input values for the masses and decay constants of the pion and the kaon, we obtain $\Lambda_{\overline{\rm MS}}^{(3)}=341(12)\,$MeV. [...]
arXiv:1706.03821; CERN-TH-2017-129; DESY-17-088; WUB-17-03.-
2017-09-08 - 6 p.
- Published in : Phys. Rev. Lett. 119 (2017) 102001
Fulltext: 10.1103_PhysRevLett.119.102001 - PDF; arXiv:1706.03821 - PDF;
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