2025-02-18
05:11 |
The hadronic contribution to the running of $\alpha$ and the electroweak mixing angle
/ Conigli, Alessandro (Helmholtz Inst., Mainz ; Darmstadt, GSI) ; von Hippel, Georg (U. Mainz, PRISMA) ; Kuberski, Simon (CERN) ; Meyer, Harvey B. (Helmholtz Inst., Mainz ; Darmstadt, GSI ; U. Mainz, PRISMA) ; Ottnad, Konstantin (U. Mainz, PRISMA) ; Wittig, Hartmut (Helmholtz Inst., Mainz ; Darmstadt, GSI ; U. Mainz, PRISMA)
We report on our update to [1] on the hadronic running of electroweak couplings from $O(a)$-improved Wilson fermions with $N_f=2+1$ flavours. The inclusion of additional ensembles at very fine lattice spacings together with a number of techniques to split the different contributions for a better control of cutoff effects allows us to substantially improve the precision. [...]
arXiv:2502.10159; MITP-25-007; CERN-TH-2025-022.-
2025-02-12 - 10 p.
- Published in : PoS LATTICE2024 (2025) 287
Fulltext: 2502.10159 - PDF; document - PDF;
In : 41st International Symposium on Lattice Field Theory (Lattice 2024), Liverpool, United Kingdom, 20 Jul - 3 Aug 2024, pp.287
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2025-02-18
04:58 |
Machine-learning techniques as noise reduction strategies in lattice calculations of the muon $g-2$
/ Wittig, Hartmut (U. Mainz, PRISMA ; Mainz U., Inst. Phys. ; Darmstadt, GSI) ; Blum, Thomas (Connecticut U.) ; Conigli, Alessandro (Mainz U., Inst. Phys. ; Darmstadt, GSI) ; Geyer, Lukas (U. Mainz, PRISMA) ; Kuberski, Simon (CERN) ; Segner, Alexander (Mainz U., Inst. Phys. ; Darmstadt, GSI ; U. Mainz, PRISMA)
Lattice calculations of the hadronic contributions to the muon anomalous magnetic moment are numerically highly demanding due to the necessity of reaching total errors at the sub-percent level. Noise-reduction techniques such as low-mode averaging have been applied successfully to determine the vector-vector correlator with high statistical precision in the long-distance regime, but display an unfavourable scaling in terms of numerical cost. [...]
arXiv:2502.10237; CERN-TH-2025-038; MITP-25-010.-
2025-02-14 - 9 p.
- Published in : 10.22323/1.466.0270
Fulltext: 2502.10237 - 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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2025-02-11
15:04 |
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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2025-02-04
04:27 |
From scattering towards multi-hadron weak decays
/ Erben, Felix (CERN)
In this article I provide an overview of the current state of scattering within lattice QCD, along with ongoing projects that examine weak decays involving scattering states as either final or intermediate states. Significant progress has been made in the study of multi-hadron weak decays, opening the door for scattering calculations to make meaningful contributions to flavour physics and further establishing lattice QCD as the key non-perturbative tool for QCD predictions. [...]
arXiv:2501.19302; CERN-TH-2025-031.-
2025-02-01 - 22 p.
- Published in : PoS LATTICE2024 (2025) 016
Fulltext: 2501.19302 - PDF; document - PDF;
In : 41st International Symposium on Lattice Field Theory (Lattice 2024), Liverpool, United Kingdom, 20 Jul - 3 Aug 2024, pp.016
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2025-02-01
04:27 |
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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2025-01-31
05:09 |
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2025-01-31
05:02 |
Is gauge mediation in the swampland?
/ Dalianis, Ioannis (Athens U.) ; Farakos, Fotis (Padua U. ; INFN, Padua) ; Kehagias, Alex (Natl. Tech. U., Athens)
We note that the typical gauge mediation of supersymmetry breaking is in tension with the global limit of the festina lente swampland bound. The alternatives are mediation/breaking schemes that decouple together with gravity, as for example gravity mediation, for which we highlight some basic phenomenological properties. [...]
arXiv:2305.17089; CERN-TH-2023-106.-
2023-07-13 - 7 p.
Fulltext: PDF;
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2025-01-31
04:33 |
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2025-01-29
05:07 |
Are Parton Showers Inside a Quark-Gluon Plasma Strongly Coupled? A Theorist's Test
/ Arnold, Peter (Virginia U.) ; Elgedawy, Omar (Virginia U. ; South China Normal U. ; Cape Town U., Dept. Math. ; Guangzhou U.) ; Iqbal, Shahin (Quaid-i-Azam U. ; CERN)
We study whether in-medium showers of high-energy quarks and gluons can be treated as a sequence of individual splitting processes or whether there is significant quantum overlap between where one splitting ends and the next begins. Accounting for the Landau-Pomeranchuk-Migdal (LPM) effect, we calculate such overlap effects to leading order in high-energy $\alpha_s(\mu)$ for the simplest theoretical situation. [...]
arXiv:2501.15115; CERN-TH-2024-163.-
2024-12-17 - 7 p.
- Published in : PoS: ICHEP2024 (2025) , pp. 582
Fulltext: 2501.15115 - PDF; document - PDF;
In : 42nd International Conference on High Energy Physics (ICHEP 2024), Prague, Czech Republic, 18 - 24 Jul 2024, pp.582
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2025-01-01
04:33 |
Top-quark pole mass extraction at NNLO accuracy
/ Alekhin, Sergey (Hamburg U., Inst. Theor. Phys. II) ; Garzelli, Maria Vittoria (Hamburg U., Inst. Theor. Phys. II ; CERN) ; Mazzitelli, Javier (PSI, Villigen) ; Moch, Sven-Olaf (Hamburg U., Inst. Theor. Phys. II) ; Zenaiev, Oleksandr (Hamburg U., Inst. Theor. Phys. II)
We describe our recent NNLO QCD extraction of the top-quark pole mass from fits to experimental data on total inclusive and normalized (multi)-differential cross sections for $t\bar{t} + X$ hadroproduction, using as input various modern PDF + $\alpha_s(M_Z)$ sets. We find top-quark mass values compatible among each other and with the PDG 2024 preferred value..
arXiv:2412.20259; CERN-TH-2024-225.-
2024-12-31 - 6 p.
- Published in : PoS: LHCP2024 (2025) , pp. 320
Fulltext: 2412.20259 - PDF; document - PDF;
In : 12th Edition of the Large Hadron Collider Physics Conference, Boston, United States, 3 - 7 Jun 2024, pp.320
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