2024-03-21 05:42 |
Detaljnije - Slični zapisi
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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 - 19 p.
- Published in : JHEP 2405 (2024) 287
Fulltext: document - PDF; 2403.03976 - PDF;
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2024-02-13 04:27 |
Detaljnije - Slični zapisi
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2024-02-02 04:45 |
Detaljnije - Slični zapisi
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2024-01-31 04:41 |
Detaljnije - Slični zapisi
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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 |
Detaljnije - Slični zapisi
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2024-01-19 04:52 |
Photons in the proton: implications for the LHC
/ NNPDF Collaboration
We construct a set of parton distribution functions (PDFs), based on the recent NNPDF4.0 PDF set, that also include a photon PDF. The photon PDF is constructed using the LuxQED formalism, while QED evolution accounting for O(alpha), O(alpha alphas) and O(alpha^2) corrections is implemented and benchmarked by means of the EKO code. [...]
arXiv:2401.08749; TIF-UNIMI-2023-17; Edinburgh 2023/19; CERN-TH-2023-159.-
2024-05-28 - 29 p.
- Published in : Eur. Phys. J. C 84 (2024) 540
Fulltext: document - PDF; 2401.08749 - PDF;
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