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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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Hadron Spectroscopy with Lattice QCD
/ Bulava, John (DESY, Zeuthen) ; Briceño, Raúl (Jefferson Lab ; Old Dominion U.) ; Detmold, William (MIT, Cambridge, CTP ; IAIFI, Cambridge) ; Döring, Michael (George Washington U. ; Jefferson Lab) ; Edwards, Robert G. (Jefferson Lab) ; Francis, Anthony (Bern U. ; Taiwan, Natl. Chiao Tung U. ; CERN) ; Knechtli, Francesco (Wuppertal U.) ; Lewis, Randy (York U., Canada) ; Prelovsek, Sasa (Ljubljana U. ; Stefan Inst., Ljubljana) ; Ryan, Sinéad M. (TCD, Dublin) et al.
The status and prospects for investigations of exotic and conventional hadrons with lattice QCD are discussed. [...]
arXiv:2203.03230 ; FERMILAB-FN-1149-T.
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35 p.
Fermilab Library Server - eConf - Fulltext - Fulltext
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5.
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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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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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9.
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Physical and cut-off effects of heavy sea quarks
/ Knechtli, Francesco (Wuppertal U.) ; Finkenrath, Jacob (Wuppertal U.) ; Leder, Björn (Wuppertal U.) ; Athenodorou, Andreas (Cyprus U.) ; Bruno, Mattia (NIC, Zeuthen ; DESY, Zeuthen) ; Sommer, Rainer (NIC, Zeuthen ; DESY, Zeuthen) ; Marinkovic, Marina (CERN)
We simulate a theory with two dynamical O($a$) improved Wilson quarks whose mass $M$ ranges from a factor eight up to a factor two below the charm quark mass and at three values of the lattice spacing ranging from 0.066 to 0.034 fm. This theory is a prototype to study the decoupling of heavy quarks. [...]
arXiv:1411.1239; WUP-14-14; DESY-14-209; SFB-CPP-14-86; CERN-PH-TH-2014-215; WUP 14-14; DESY 14-209; SFB-CPP-14-86; CERN-PH-TH-2014-215.-
SISSA, 2014-11-05 - 7 p.
- Published in : PoS Lattice2014 (2014) 288
Fulltext: PDF; External link: Preprint
In : 32nd International Symposium on Lattice Field Theory, Columbia U., New York, NY, USA, 23 - 28 Jun 2014, pp.288
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10.
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The strange quark mass and Lambda parameter of two flavor QCD
/ Fritzsch, Patrick (Humboldt U., Berlin) ; Knechtli, Francesco (Wuppertal U., Dept. Math.) ; Leder, Bjorn (Wuppertal U., Dept. Math.) ; Marinkovic, Marina (Humboldt U., Berlin) ; Schaefer, Stefan (CERN) ; Sommer, Rainer (NIC, Zeuthen ; DESY, Zeuthen) ; Virotta, Francesco (NIC, Zeuthen ; DESY, Zeuthen)
We complete the non-perturbative calculations of the strange quark mass and the Lambda parameter in two flavor QCD by the ALPHA collaboration. The missing lattice scale is determined via the kaon decay constant, for whose chiral extrapolation complementary strategies are compared. [...]
arXiv:1205.5380; CERN-PH-TH-2012-119; DESY-12-078; HU-EP-12-15; SFB-CPP-12-24; WUB-12-11; CERN-PH-TH-2012-119; DESY 12-078; HU-EP-12-15; SFB-CPP-12-24; WUB-12-11.-
2012-12-21 - 46 p.
- Published in : Nucl. Phys. B 865 (2012) 397-429
Fulltext: PDF; External link: Preprint
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