1.
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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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2.
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The $\Lambda$-parameter in 3-flavour QCD and $\alpha_s(m_Z)$ by the ALPHA collaboration
/ Bruno, M. (Brookhaven) ; Dalla Brida, M. (INFN, Milan Bicocca ; NIC, Zeuthen ; Milan Bicocca U. ; DESY, Zeuthen) ; Fritzsch, P. (CERN ; Madrid, IFT) ; Korzec, T. (Bergische U., Wuppertal (main)) ; Ramos, A. (CERN) ; Schaefer, S. (NIC, Zeuthen ; DESY, Zeuthen) ; Simma, H. (NIC, Zeuthen ; DESY, Zeuthen) ; Sint, S. (Trinity Coll., Dublin) ; Sommer, R. (NIC, Zeuthen ; Humboldt U., Berlin ; DESY, Zeuthen)
We present results by the ALPHA collaboration for the $\Lambda$-parameter in 3-flavour QCD and the strong coupling constant at the electroweak scale, $\alpha_s(m_Z)$, in terms of hadronic quantities computed on the CLS gauge configurations. The first part of this proceedings contribution contains a review of published material \cite{Brida:2016flw,DallaBrida:2016kgh} and yields the $\Lambda$-parameter in units of a low energy scale, $1/L_{\rm had}$. [...]
arXiv:1701.03075; CERN-TH-2016-262; DESY-17-007.-
SISSA, 2016-12-23 - 21 p.
- Published in : PoS LATTICE2016 (2016) 197
Fulltext: arXiv:1701.03075 - PDF; PoS(LATTICE2016)197 - PDF;
In : 34th International Symposium on Lattice Field Theory, Southampton, UK, 24 - 30 Jul 2016, pp.197
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3.
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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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4.
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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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5.
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The accuracy of QCD perturbation theory at high energies
/ Dalla Brida, Mattia (DESY, Zeuthen ; NIC, Zeuthen) ; Fritzsch, Patrick (Madrid, IFT) ; Korzec, Tomasz (Wuppertal U.) ; Ramos, Alberto (CERN) ; Sint, Stefan (Trinity Coll., Dublin) ; Sommer, Rainer (Humboldt U., Berlin ; DESY, Zeuthen ; NIC, Zeuthen)
/ALPHA Collaboration
We discuss the determination of the strong coupling $\alpha_\mathrm{\overline{MS}}^{}(m_\mathrm{Z})$ or equivalently the QCD $\Lambda$-parameter. Its determination requires the use of perturbation theory in $\alpha_s(\mu)$ in some scheme, $s$, and at some energy scale $\mu$. [...]
arXiv:1604.06193; DESY-16-053; IFT-UAM-CSIC-16-029; CERN-TH-2016-060; TCDMATH-16-04; WUB-16-00; TCD-MATH-16-04; DESY 16-053; IFT-UAM-CSIC-16-029; CERN-TH-2016-060; TCDMATH 16-04; WUB-16-00.-
Geneva Geneva : CERN, CERN, 2016 - 6 p.
- Published in : Phys. Rev. Lett. 117 (2016) 182001
APS Open Access article: PDF; Fulltext: arXiv:1604.06193 - PDF; 1604.06193 - PDF; 10.1103_PhysRevLett.117.182001 - PDF; External link: Preprint
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6.
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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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7.
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System Integration of ATLAS ITK Pixel DCS ASICs
/ Qamesh, A. (Wuppertal U.) ; Ahmad, R. (Wuppertal U.) ; Ecker, D. (Wuppertal U.) ; Fischer, T. (Cologne U.) ; Karagounis, M. (Dortmund U.) ; Kind, P. (Wuppertal U.) ; Kersten, S. (Wuppertal U.) ; Krawutschke, T. (Cologne U.) ; Schreiter, L. (Dortmund U.) ; Zeitnitz, C. (Wuppertal U.)
/ATLAS ITK Collaboration
During the ATLAS phase II upgrade, the tracking system of the ATLAS experiment will be replaced by an all-silicon detector called the inner tracker (ITK) with a pixel detector as the most inner part. The monitoring data of the new system will be aggregated from an on-detector ASIC called Monitoring Of Pixel System (MOPS) and sent to the Detector Control System(DCS) using a new interface called MOPS-HUB. [...]
arXiv:2210.16210.-
2023-05-04 - 7 p.
- Published in : JINST
Fulltext: PDF;
In : Topical Workshop on Electronics for Particle Physics 2022 (TWEPP 2022), Bergen, Norway, 19 - 23 Sep 2022, pp.C05003
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8.
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9.
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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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10.
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Running of the top quark mass at NNLO in QCD
/ Defranchis, Matteo M. (CERN) ; Kieseler, Jan (CERN) ; Lipka, Katerina (Wuppertal U. ; DESY) ; Mazzitelli, Javier (Munich, Max Planck Inst.)
The running of the top quark mass ($m_\mathrm{t}$) is probed at the next-to-next-to-leading order (NNLO) in quantum chromodynamics (QCD) for the first time. The result is obtained by comparing calculations in the modified minimal subtraction ($\mathrm{\bar{MS}}$) renormalisation scheme to a differential measurement of the top quark-antiquark ($\mathrm{t\bar{t}}$) production cross section at $\sqrt{s} = 13~\mathrm{TeV}$. [...]
arXiv:2208.11399; MPP-2022-110.-
2024-04-23 - 10 p.
- Published in : JHEP 2404 (2024) 125
Fulltext: document - PDF; 2208.11399 - PDF;
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