2024-03-09
04:15 |
NNLO QCD corrections to the $q^2$ spectrum of inclusive semileptonic $B$-meson decays
/ Fael, Matteo (CERN) ; Herren, Florian (Zurich U.)
We calculate the next-to-next-to-leading order QCD corrections to the leptonic invariant mass ($q^2$) spectrum of semileptonic $b \to c$ inclusive decays, taking into account the mass of the charm quark and the charged lepton in the final state. We obtain analytic results in terms of generalized polylogarithms and present numerical studies of the $\mathcal{O}(\alpha_s^2)$ corrections to the $q^2$ spectrum of $b \to c \ell \bar \nu_\ell$ decays, for $\ell =e, \mu$ and $\tau$, in the kinetic scheme. [...]
arXiv:2403.03976; CERN-TH-2024-025; ZU-TH 14/24.-
2024-05-24 - 21 p.
- Published in : JHEP 2405 (2024) 287
Fulltext: document - PDF; 2403.03976 - PDF;
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2024-02-13
04:27 |
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2024-01-31
04:41 |
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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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2024-01-27
04:30 |
Geometry of the spectral parameter and renormalisation of integrable sigma-models
/ Lacroix, Sylvain (ETH, Zurich (main)) ; Wallberg, Anders (CERN ; Ecole Polytechnique, Lausanne ; Zurich, ETH)
In the past few years, the unifying frameworks of 4-dimensional Chern-Simons theory and affine Gaudin models have allowed for the systematic construction of a large family of integrable $\sigma$-models. These models depend on the data of a Riemann surface $C$ (here of genus 0 or 1) and of a meromorphic 1-form $\omega$ on $C$, which encodes the geometry of their spectral parameter and the analytic structure of their Lax connection. [...]
arXiv:2401.13741; CERN-TH-2024-008.-
2024-05-09 - 62 p.
- Published in : JHEP 2405 (2024) 108
Fulltext: document - PDF; 2401.13741 - 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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2024-01-24
05:37 |
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2024-01-19
04:35 |
Double-graviton production from Standard Model plasma
/ Ghiglieri, J. (SUBATECH, Nantes) ; Laine, M. (Bern U.) ; Schütte-Engel, J. (UC, Berkeley ; Wako, RIKEN) ; Speranza, E. (CERN)
The thermal plasma filling the early universe generated a stochastic gravitational wave background that peaks in the microwave frequency range today. If the graviton production rate is expressed as a series in a fine-structure constant, $\alpha$, and the temperature over the Planck mass, $T^2_{ } / m_{\rm pl}^2$, then the lowest-order contributions come from single ($\sim \alpha T^2_{ }/m_{\rm pl}^2$) and double ($\sim T^4_{ }/m_{\rm pl}^4$) graviton production via $2\to 2$ scatterings. [...]
arXiv:2401.08766; RIKEN-iTHEMS-Report-24; CERN-TH-2023-216.-
2024-04-23 - 16 p.
- Published in : JCAP 2404 (2024) 062
Fulltext: document - PDF; 2401.08766 - 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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