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TH Articles

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2024-01-18
07:33
Isospin-breaking corrections to weak decays: the current status and a new infrared improvement / Di Carlo, Matteo
We provide an overview of the current state of lattice calculations concerning isospin-breaking corrections in weak decays, focusing in particular on leptonic decays of light pseudoscalar mesons. We examine the two currently existing calculations, placing a particular emphasis on the role of electromagnetic finite-volume corrections. [...]
arXiv:2401.07666; CERN-TH-2024-005.- 2024-01-23 - 18 p.
- Published in : PoS: LATTICE2023 (2024) , pp. 120 Fulltext: 2401.07666 - PDF; document - PDF;
In : 40th International Symposium on Lattice Field Theory (Lattice 2023), Fermilab, Batavia, IL, United States, 30 Jul - 5 Aug 2023, pp.120

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2024-01-17
04:28
Brickwall in Rotating BTZ: A Dip-Ramp-Plateau Story / Das, Suman (HBNI, Mumbai) ; Kundu, Arnab (HBNI, Mumbai ; CERN)
In this article, building on our recent investigations and motivated by the fuzzball-paradigm, we explore normal modes of a probe massless scalar field in the rotating BTZ-geometry in an asymptotically AdS spacetime and correspondingly obtain the Spectral Form Factor (SFF) of the scalar field. In particular, we analyze the SFF obtained from the single-particle partition function. [...]
arXiv:2310.06438; CERN-TH-2023-187.- 2024-02-08 - 40 p. - Published in : JHEP 2402 (2024) 049 Fulltext: 2310.06438 - PDF; document - PDF;

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2023-12-26
04:22
Extrapolating semileptonic form factors using Bayesian-inference fits regulated by unitarity and analyticity / Flynn, Jonathan ; Juettner, Andreas (CERN ; Southampton U.) ; Tsang, Tobias (CERN)
We discuss our recently proposed model-independent framework for fitting hadronic form-factor data, which are often only available at discrete kinematical points, using parameterisations based on unitarity and analyticity. The accompanying dispersive bound on the form factors (unitarity constraint) is used to regulate the ill-posed fitting problem and allow model-independent predictions over the entire physical range. [...]
arXiv:2312.14631; CERN-TH-2023-248.- 2023-12-27 - 7 p. - Published in : PoS LATTICE2023 (2024) 239 Fulltext: 2312.14631 - PDF; document - PDF;
In : 40th International Symposium on Lattice Field Theory (Lattice 2023), Fermilab, Batavia, IL, United States, 30 Jul - 5 Aug 2023, pp.239

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2023-12-23
04:13
Muon $g-2$: Lattice calculations of the hadronic vacuum polarization / Kuberski, Simon
The experimental uncertainty on the anomalous magnetic moment of the muon has been significantly reduced with the recent results of the Fermilab $g-2$ experiment, and a further reduction is expected in the near future. The precision of the Standard Model prediction needs to improve correspondingly to increase the sensitivity of tests for physics beyond the Standard Model. [...]
arXiv:2312.13753; CERN-TH-2023-244; MITP-23-079.- 2024-01-15 - 24 p. - Published in : PoS LATTICE2023 (2024) 125 Fulltext: 2312.13753 - PDF; document - PDF;
In : 40th International Symposium on Lattice Field Theory (Lattice 2023), Fermilab, Batavia, IL, United States, 30 Jul - 5 Aug 2023, pp.125

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2023-12-13
05:10
The Higgs-gluon form factor at three loops in QCD with three mass scales / Niggetiedt, Marco (Garching, Max Planck Inst.) ; Usovitsch, Johann (CERN)
We report on the complete three-loop corrections to the Higgs-gluon form factor in QCD. While previous calculations are based on QCD with a single heavy quark of arbitrary mass, we extend the study to QCD involving two different massive quark flavors. [...]
arXiv:2312.05297; MPP-2023-280; CERN-TH-2023-236.- 2024-02-14 - 22 p. - Published in : JHEP 2402 (2024) 087 Fulltext: document - PDF; 2312.05297 - PDF;

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2023-11-28
08:42
Relating $\beta'_*$ and $\gamma'_{Q*}$ in the ${\cal N}=1$ SQCD Conformal Window / Shifman, Mikhail (Minnesota U., Theor. Phys. Inst.) ; Zwicky, Roman (U. Edinburgh, Higgs Ctr. Theor. Phys. ; CERN)
In this note we show that $\beta'_*$, the $\beta$-function slopes in the electric and magnetic theories are equal at the corresponding infrared fixed points. This follows from the scaling of the correlators of the trace of the energy momentum tensors. [...]
arXiv:2310.16449; FTPI-MINN-23-19; CERN-TH-2023-188; UMN-TH-4227/23.- 2023-12-01 - 8 p. - Published in : Phys. Rev. D 108 (2023) 114013 Fulltext: 2310.16449 - PDF; Publication - PDF;

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2023-11-02
04:11
The first-order factorizable contributions to the three-loop massive operator matrix elements $A_{Qg}^{(3)}$ and $\Delta A_{Qg}^{(3)}$ / Ablinger, J. (Linz U. ; OAW, Linz, RICAM) ; Behring, A. (CERN ; DESY, Zeuthen) ; Blümlein, J. (DESY, Zeuthen) ; De Freitas, A. (Linz U. ; DESY, Zeuthen) ; von Manteuffel, A. (Regensburg U. ; Michigan State U.) ; Schneider, C. (Linz U.) ; Schönwald, K. (Zurich U.)
The unpolarized and polarized massive operator matrix elements $A_{Qg}^{(3)}$ and $\Delta A_{Qg}^{(3)}$ contain first-order factorizable and non-first-order factorizable contributions in the determining difference or differential equations of their master integrals. We compute their first-order factorizable contributions in the single heavy mass case for all contributing Feynman diagrams. [...]
arXiv:2311.00644; DO-TH 23/12; DESY 23-142; CERN-TH-2023-164; MSUHEP-23-025; RISC Report series 23-12; ZU-TH 60/23.- 2024-01-10 - 58 p. - Published in : Nucl. Phys. B 999 (2024) 116427 Fulltext: 2311.00644 - PDF; Publication - PDF;

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2023-10-20
04:38
Could a Kilonova Kill: a Threat Assessment / Perkins, Haille M.L. ; Ellis, John ; Fields, Brian D. ; Hartmann, Dieter H. ; Liu, Zhenghai ; McLaughlin, Gail C. ; Surman, Rebecca ; Wang, Xilu
Binary neutron star mergers (BNS) produce high-energy emissions from several physically different sources, including a gamma-ray burst (GRB) and its afterglow, a kilonova, and, at late times, a remnant many parsecs in size. Ionizing radiation from these sources can be dangerous for life on Earth-like planets when located too close. [...]
arXiv:2310.11627; KCL-PH-TH/2023-55; CERN-TH-2023-190.- 2024-01-24 - 14 p. - Published in : Astrophys. J. 961 (2024) 170 Fulltext: 2310.11627 - PDF; document - PDF;

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2023-10-14
04:17
Emergence of Species Scale Black Hole Horizons / Calderón-Infante, José (CERN) ; Delgado, Matilda (Madrid, IFT) ; Uranga, Angel M. (Madrid, IFT)
The scale at which quantum gravity becomes manifest, the species scale $\Lambda_s$, has recently been argued to take values parametrically lower than the Planck scale. We use black holes of vanishing horizon area (small black holes) in effective field theories coupled to quantum gravity to shed light on how the three different physical manifestations of the species scale $\Lambda_s$ relate to each other. [...]
arXiv:2310.04488; IFT-UAM/CSIC-23-123; CERN-TH-2023-173.- 2024-01-02 - 40 p. - Published in : JHEP 2401 (2024) 003 Fulltext: 2310.04488 - PDF; Publication - PDF;

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2023-10-14
04:02
Two-loop five-particle scattering amplitudes / Zoia, Simone (CERN)
I discuss the recent advances in the computation of two-loop scattering amplitudes for five-particle processes. The latter are fundamental ingredients to obtain predictions at the next-to-next-to-leading order (NNLO) in QCD for many interesting LHC processes. [...]
arXiv:2310.04275; CERN-TH-2023-185.- 2023-10-13 - 12 p. - Published in : PoS RADCOR2023 (2024) 032 Fulltext: 2310.04275 - PDF; document - PDF;

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