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PIONEER: Studies of Rare Pion Decays / PIONEER Collaboration
A next-generation rare pion decay experiment, PIONEER, is strongly motivated by several inconsistencies between Standard Model (SM) predictions and data pointing towards the potential violation of lepton flavor universality. [...]
arXiv:2203.01981. - 68 p.
Fermilab Library Server - Fulltext - Fulltext

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Logarithmically enhanced Euler-Heisenberg Lagrangian contribution to the electron gyromagnetic factor / Czarnecki, Andrzej (Alberta U.) ; Piclum, Jan (Siegen U.) ; Szafron, Robert (CERN)
Contrary to what was previously believed, two-loop radiative corrections to the $g$-factor of an electron bound in a hydrogen-like ion at $\mathcal{O}\left(\alpha^2 (Z\alpha)^5\right)$ exhibit logarithmic enhancement. This previously unknown contribution is due to a long-distance light-by-light scattering amplitude. [...]
arXiv:2008.07550; Alberta Thy 2-20; SI-HEP-2020-21; P3H-20-042; CERN-TH-2020-137.- 2020-11-11 - 5 p. - Published in : Phys. Rev. A 102 (2020) 050801 Fulltext: PDF; Fulltext from publisher: PDF;

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Magnetic moment of a bound electron / Czarnecki, Andrzej (Alberta U. ; CERN) ; Dowling, Matthew (Alberta U.) ; Mondejar, Jorge (Alberta U.) ; Piclum, Jan H. (Alberta U.)
Theoretical predictions underlying determinations of the fine structure constant alpha and the electron-to-proton mass ratio m_e/m_p are reviewed, with the emphasis on the bound electron magnetic anomaly g-2. The theory of the interaction of hydrogen-like ions with a magnetic field is discussed. [...]
arXiv:1007.1176; ALBERTA-THY-09-10; CERN-PH-2010-155; ALBERTA-THY-09-10; CERN-PH-2010-155-[SIC!]; CERN-PH-TH-2010-155.- 2010 - 6 p. - Published in : Nucl. Phys. B, Proc. Suppl. 205-206 (2010) 271-276 Fulltext: PDF; External link: Preprint
In : 10th DESY workshop on elementary particle theory: loops and legs in quantum field theory, Wörlitz, Germany, 25 - 30 Apr 2010, pp.271-276

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Helicity fractions of W bosons from top quark decays at NNLO in QCD / Czarnecki, Andrzej (Alberta U. ; CERN) ; Korner, Jurgen G. (Mainz U., Inst. Phys.) ; Piclum, Jan H. (Alberta U.)
Decay rates of unpolarized top quarks into longitudinally and transversally polarized W bosons are calculated to second order in the strong coupling constant alpha_s. Including the finite bottom quark mass and electroweak effects, the Standard Model predictions for the W boson helicity fractions are F_L=0.687(5), F_+=0.0017(1), and F_-=0.311(5)..
arXiv:1005.2625; ALBERTA-THY-05-10; CERN-PH-TH-2010-098; MZ-TH-10-13; ALBERTA-THY-05-10; CERN-PH-TH-2010-098; MZ-TH-10-13.- 2010 - 5 p. - Published in : Phys. Rev. D 81 (2010) 111503 APS Published version, local copy: PDF; Fulltext: PDF; External link: Preprint

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Radiative-nonrecoil corrections of order alpha^2 (Z alpha) E_F to the hyperfine splitting of muonium / Mondejar, Jorge (Alberta U.) ; Piclum, Jan H. (Alberta U.) ; Czarnecki, Andrzej (Alberta U. ; CERN)
We present results for the corrections of order alpha^2 (Z alpha) E_F to the hyperfine splitting of muonium. We compute all the contributing Feynman diagrams in dimensional regularization and a general covariant gauge using a mixture of analytical and numerical methods. [...]
arXiv:1005.1944; ALBERTA-THY-06-10; CERN-PH-2010-099; ALBERTA-THY-06-10; CERN-PH-2010-099-[SIC!]; CERN-PH-TH-2010-099.- 2010 - 5 p. - Published in : Phys. Rev. A 81 (2010) 062511 APS Published version, local copy: PDF; Fulltext: PDF; External link: Preprint

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23rd Lake Louise Winter Institute 2008 - LLWI-08 Fundamental Interactions 18 - 23 Feb 2008 - Lake Louise, Canada / Astbury, Alan (ed.); Penin, Alexander (ed.); Khanna. Faqir (ed.); Moore, Roger (ed.); Czarnecki, Andrzej (ed.)
Hackensack, NJ : World Scientific, 2009
e-proceedings

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Estimate of $BR(\overline{B} \to X_{s}\gamma)$ at $O(\alpha_{s^2})$ / Misiak, M. (Warsaw U. ; CERN) ; Asatrian, H.M. (Yerevan Phys. Inst.) ; Bieri, K. (Bern U.) ; Czakon, M. (Wurzburg U.) ; Czarnecki, A. (Alberta U.) ; Ewerth, T. (Bern U.) ; Ferroglia, A. (Freiburg U.) ; Gambino, P. (INFN, Turin ; Turin U.) ; Gorbahn, M. (Karlsruhe U., TTP) ; Greub, C. (Bern U.) et al.
Combining our results for various O(alpha_s^2) corrections to the weak radiative B-meson decay, we are able to present the first estimate of the branching ratio at the next-to-next-to-leading order in QCD. We find BR(B -> X_s gamma) = (3.15 +_ 0.23) x 10^-4 for E_gamma > 1.6 GeV in the B-meson rest frame. [...]
hep-ph/0609232; IFT-18-2006; CERN-PH-TH-2006-184; YERPHI-1608-6; FREIBURG-THEP-06-13; DFTT-20-2006; SFB-CPP-06-45; TTP06-26; ZU-TH-22-06; SLAC-PUB-12117; DESY-06-168; DESY-06-168; DESY-2006-168; CERN-PH-TH-2006-184; IFT-2006-18; YERPHI-1608-6; Freiburg-THEP-2006-13; DFTT-20-2006; SFB-CPP-2006-45.- Hamburg : DESY, 2007 - 4 p. - Published in : Phys. Rev. Lett. 98 (2007) 022002 APS Published version, local copy: PDF; Fulltext: arXiv:hep-ph_0609232 - PDF; 0609232 - PDF; External links: Fulltext; SLAC Document Server

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Muon g-2 : a theoretical review / Czarnecki, Andrzej
2005 - Published in : Nucl. Phys. B, Proc. Suppl. 144 (2005) 201-205
In : 8th International Workshop on Tau Lepton Physics, Nara, Japan, 14 - 17 Sep 2004, pp.201-205

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G-2 Theory / Czarnecki, Andrzej
2001.

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10.

Electromagnetic suppression of the decay mu --> e+gamma / Czarnecki, Andrzej (Alberta U.) ; Jankowski, Ernest (Alberta U. ; CERN)
Due to large QED anomalous dimensions of the electric and magnetic dipole operators, the rate of the rare muon decay mu --> e+gamma is suppressed by the factor [ 1- 8 alpha/pi ln(Lambda/m_mu) ], independent of the physics responsible for the lepton-flavor violation, except for the scale Lambda at which it occurs. For Lambda = 100 -- 1000 GeV, the resulting decrease of the rate amounts to about 12 -- 17 %..
hep-ph/0106237; ALBERTA-THY-06-01; BNL-HET-01-26; ALBERTA-THY-2001-06-01; BNL-HET-2001-26.- Edmonton : Alberta Univ. Dept. Phys., 2002 - 7 p. - Published in : Phys. Rev. D 65 (2002) 113004 APS Published version, local copy: PDF; Access to fulltext document: PDF; Fulltext: PDF; External link: hep-ph/0106237 PDF

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2	Czarnecki, A
126	Czarnecki, Andrzej

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