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1.
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Flavor mixing in charmonium and light mesons with optimal distillation profiles
/ Urrea-Niño, Juan Andrés (Wuppertal U.) ; Knechtli, Francesco (Wuppertal U.) ; Finkenrath, Jacob (CERN) ; Korzec, Tomasz (Wuppertal U.) ; Peardon, Michael J. (Trinity Coll., Dublin) ; Höllwieser, Roman (Wuppertal U.)
We study the light meson - charmonium - glueball mixing using flavor-singlet meson operators built from optimal distillation profiles together with purely gluonic operators in different $J^{PC}$ channels at two different pion masses ($\approx$$420$, $800$ MeV) in two $N_{\rm f} = 3 + 1$ ensembles at close to physical charm quark mass. We observe non-zero mixing correlations between the different types of operators and quantify the overlaps between states created by them and the energy eigenstates by means of a GEVP formulation. [...]
arXiv:2502.04977; WUB/25-02; CERN-TH-2025-026.-
2025-02-12 - 10 p.
- Published in : 10.22323/1.466.0080
Fulltext: 2502.04977 - PDF; document - PDF;
In : 41st International Symposium on Lattice Field Theory (Lattice 2024), Liverpool, United Kingdom, 20 Jul - 3 Aug 2024, pp.
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2.
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Update on two-level sampling for glueball observables in quenched QCD
/ Barca, Lorenzo (NIC, Zeuthen) ; Finkenrath, Jacob (CERN) ; Knechtli, Francesco (Wuppertal U.) ; Peardon, Michael J. (Trinity Coll., Dublin) ; Schaefer, Stefan (NIC, Zeuthen) ; Urrea-Niño, Juan Andrés (Wuppertal U.)
We report our progress in combining a two-level sampling algorithm with distillation techniques for calculations of disconnected diagrams in quenched QCD. The simulations are performed on a single ensemble at $\beta=6.0$ and volume $V=16^3\times 64$, and at a pion mass of $m_\pi\approx 760~\mathrm{MeV}$..
arXiv:2501.17988; DESY-25-014; CERN-TH-2025-025.-
2025-01-29 - 10 p.
- Published in : PoS LATTICE2024 (2025) 062
Fulltext: 2501.17988 - PDF; document - PDF;
In : 41st International Symposium on Lattice Field Theory (Lattice 2024), Liverpool, United Kingdom, 20 Jul - 3 Aug 2024, pp.062
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4.
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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; CERN–TH–2024–004.-
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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5.
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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; CERN-TH-2023-230.-
2024-01-31 - 26 p.
- Published in : JHEP 2024 (2020) 188
Fulltext: 2401.00216 - PDF; document - PDF;
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6.
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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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7.
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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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8.
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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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9.
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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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10.
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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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