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2025-03-15
04:31
$\eta$, $\eta^\prime$ mesons from lattice QCD in fully physical conditions / Ottnad, Konstantin (U. Mainz, PRISMA ; Mainz U., Inst. Kernphys.) ; Bacchio, Simone (Cyprus Inst.) ; Finkenrath, Jacob (CERN) ; Kostrzewa, Bartosz (Bonn U., HISKP ; U. Bonn, Phys. Inst., BCTP) ; Petschlies, Marcus (Bonn U., HISKP ; U. Bonn, Phys. Inst., BCTP) ; Pittler, Ferenc (Cyprus Inst.) ; Urbach, Carsten (Bonn U., HISKP ; U. Bonn, Phys. Inst., BCTP) ; Wenger, Urs (Bern U.)
We determine masses and mixing parameters of the $\eta$ and $M_{\eta^\prime}$ meson in lattice QCD. [...]
MITP-25-021 ; CERN-TH-2025-052 ; arXiv:2503.09895. - 24.
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2025-03-11
04:09
Status and outlook of quark flavour physics / Tsang, Justus Tobias (CERN)
In recent years there has been impressive progress in quark flavour physics, with current efforts tackling complicated quantities such as for example inclusive decays, decays to QCD-unstable final states and radiative decays. [...]
CERN-TH-2025-050 ; arXiv:2503.05554. - 14.
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2025-03-07
04:17
Large charge meets semiclassics in $\mathcal{N}=4$ super Yang-Mills / Brown, Augustus (Queen Mary, U. of London) ; Galvagno, Francesco (Queen Mary, U. of London) ; Grassi, Alba (U. Geneva (main)) ; Iossa, Cristoforo (U. Geneva (main)) ; Wen, Congkao (Queen Mary, U. of London)
We study the large-charge sector of $\mathcal{N}=4$ super Yang-Mills theory (SYM) with $SU(N)$ gauge group by constructing a special class of half-BPS heavy operators, termed "canonical operators". [...]
CERN-TH-2025-016 ; QMUL-PH-25-03 ; arXiv:2503.02028. - 49.
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2025-02-27
04:23
Collinear Approximations for LHC Cross Sections: Factorization and Resummation / Mistlberger, Bernhard (SLAC) ; Vita, Gherardo (CERN)
We explore a factorization theorem for color singlet production cross sections at the LHC in the limit of additional radiation becoming collinear to the direction of either of the colliding protons. [...]
CERN-TH-2025-041 ; SLAC-PUB-250203 ; arXiv:2502.17548. - 32.
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2025-02-27
04:17
Real-time simulation of jet energy loss and entropy production in high-energy scattering with matter / Barata, João (CERN) ; Rico, Enrique (CERN)
In analogy to high-energy nuclear scattering experiments, we study a real-time scattering process between a propagating state and a dense target in $1+1$-d massive QED. [...]
CERN-TH-2025-019 ; arXiv:2502.17558. - 12.
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2025-02-25
04:01
Lepton Flavor Asymmetries: from the early Universe to BBN / Domcke, Valerie (CERN) ; Escudero, Miguel (CERN) ; Fernandez Navarro, Mario (Glasgow U.) ; Sandner, Stefan (Los Alamos)
Large primordial lepton flavor asymmetries with almost vanishing total baryon-minus-lepton number can evade the usual BBN and CMB constraints if neutrino oscillations lead to perfect flavor equilibration. [...]
CERN-TH-2025-010 ; LA-UR-25-20235 ; arXiv:2502.14960. - 42.
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2025-02-22
04:10
Anomalous Dimension of a General Effective Gauge Theory I: Bosonic Sector / Aebischer, Jason (CERN) ; Bresciani, Luigi C. (Padua U. ; INFN, Padua) ; Selimovic, Nudzeim (INFN, Padua)
We classify the physical operators of the most general bosonic effective gauge theory up to dimension six using on-shell methods. [...]
CERN-TH-2025-032 ; arXiv:2502.14030. - 47.
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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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2025-02-18
04:53
The Irrelevance of Primordial Black Hole Clustering in the LVK mass range / Crescimbeni, F. (U. Rome La Sapienza (main) ; INFN, Rome) ; Desjacques, V. (Technion) ; Franciolini, G. (CERN) ; Ianniccari, A. (Geneva U., CAP) ; Iovino, A.J. (Geneva U., CAP) ; Perna, G. (Padua U. ; Padua U., Astron. Dept. ; INFN, Padua) ; Perrone, D. (Geneva U., CAP) ; Riotto, A. (Geneva U., CAP) ; Veermäe, H. (NICPB, Tallinn)
We show that in realistic models where primordial black holes are formed due to the collapse of sizeable inflationary perturbations, their initial spatial clustering beyond Poisson distribution does not play any role in the binary mergers, including sub-solar primordial black holes, responsible for the gravitational waves detectable by LIGO-Virgo-KAGRA. [...]
CERN-TH-2025-027 ; arXiv:2502.01617. - 14.
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