2024-02-13 04:27 |
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2024-01-27 04:33 |
Astrophysical Axion Bounds: The 2024 Edition
/ Caputo, Andrea ; Raffelt, Georg
We review the current status of astrophysical bounds on QCD axions, primarily based on the observational effects of nonstandard energy losses on stars, including black-hole superradiance. Over the past few years, many of the traditional arguments have been reexamined both theoretically and using modern data and new ideas have been put forth. [...]
arXiv:2401.13728; MPP-2024-13; CERN-TH-2024-013.-
2024-03-11 - 81 p.
- Published in : 10.22323/1.454.0041
Fulltext: document - PDF; 2401.13728 - PDF;
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2024-01-24 06:08 |
Hadronic vacuum polarization in the muon $g-2$: The short-distance contribution from lattice QCD
/ Kuberski, Simon (CERN) ; Cè, Marco (INFN, Milan Bicocca) ; von Hippel, Georg (U. Mainz, PRISMA) ; Meyer, Harvey B. (U. Mainz, PRISMA ; Mainz U., Inst. Phys. ; Darmstadt, GSI) ; Ottnad, Konstantin (U. Mainz, PRISMA) ; Risch, Andreas (Wuppertal U. ; NIC, Zeuthen ; DESY, Zeuthen) ; Wittig, Hartmut (U. Mainz, PRISMA ; Mainz U., Inst. Phys. ; Darmstadt, GSI)
We present results for the short-distance window observable of the hadronic vacuum polarization contribution to the muon $g-2$, computed via the time-momentum representation (TMR) in lattice QCD. A key novelty of our calculation is the reduction of discretization effects by a suitable subtraction applied to the TMR kernel function, which cancels the leading $x_0^4$-behaviour at short distances. [...]
arXiv:2401.11895; MITP-24-011; CERN-TH-2024-011.-
2024-03-29 - 36 p.
- Published in : JHEP 2403 (2024) 172
Fulltext: 2401.11895 - PDF; document - PDF;
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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 - 33 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 |
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2023-12-21 05:17 |
Interference Effects in $\mathbf{gg \to H \to Z \gamma}$ Beyond Leading Order
/ Buccioni, Federico (Munich, Tech. U.) ; Devoto, Federica (U. Oxford (main)) ; Djouadi, Abdelhak (Granada U.) ; Ellis, John (King's Coll. London ; CERN) ; Quevillon, Jérémie (Annecy, LAPTH) ; Tancredi, Lorenzo (Munich, Tech. U.)
The ATLAS and CMS collaborations at the LHC have recently announced evidence for the rare Higgs boson decay into a $Z$ boson and a photon. We analyze the interference between the process $gg\! \to \! H \! \to \! Z \gamma$ induced by loops of heavy particles, which is by far the dominant contribution to the signal, and the continuum $gg \to Z \gamma$ QCD background process mediated by light quark loops. [...]
arXiv:2312.12384; KCL-PH-TH/2023-70; CERN-TH-2023-228; TUM-HEP-1488/23; OUTP-23-18P.-
2024-03-24 - 6 p.
- Published in : Phys. Lett. B 851 (2024) 138596
Fulltext: PDF;
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2023-12-13 05:10 |
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2023-12-07 04:28 |
Probing Supermassive Black Hole Seed Scenarios with Gravitational-wave Measurements
/ Ellis, John (King's Coll. London ; CERN) ; Fairbairn, Malcolm (King's Coll. London) ; Urrutia, Juan ; Vaskonen, Ville
The process whereby the supermassive black holes populating the centers of galaxies have been assembled remains to be established, with the relative importance of seeds provided by collapsed Population-III stars, black holes formed in nuclear star clusters via repeated mergers, or direct collapses of protogalactic disks yet to be determined. In this paper we study the prospects for casting light on this issue by future measurements of gravitational waves emitted during the inspirals and mergers of pairs of intermediate-mass black holes, discussing in particular the roles of prospective measurements by LISA and the proposed atom interferometers AION and AEDGE. [...]
arXiv:2312.02983; KCL-PH-TH/2023-69; CERN-TH-2023-227.-
2024-03-11 - 7 p.
- Published in : Astrophys. J. 964 (2024) 11
Fulltext: document - PDF; 2312.02983 - PDF;
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