CERN Accelerating science

TH Articles

Three-loop $b\to s\gamma$ vertex with current-current operators / Fael, Matteo (CERN) ; Lange, Fabian (KIT, Karlsruhe, TTP ; KIT, Karlsruhe, IAP) ; Schönwald, Kay (Zurich U.) ; Steinhauser, Matthias (KIT, Karlsruhe, TTP)
We compute three-loop vertex corrections to $b\to s\gamma$ induced by current-current operators. The results are presented as expansions in $m_c/m_b$ with numerical coefficients which allow to cover all relevant values for the heavy quark masses in different renormalization schemes. [...]
arXiv:2309.14706; CERN-TH-2023-148; P3H-23-059; TTP23-035; ZU-TH 56/23.- 2023-11-23 - 22 p. - Published in : JHEP 2311 (2023) 166 Fulltext: 2309.14706 - PDF; document - PDF;

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Higgs boson pair production at NLO in the POWHEG approach and the top quark mass uncertainties / Bagnaschi, Emanuele (CERN) ; Degrassi, Giuseppe (Rome III U.) ; Gröber, Ramona (Padua U. ; INFN, Padua)
We present a new Monte Carlo code for Higgs boson pair production at next-to-leading order in the POWHEG-BOX Monte Carlo approach. The code is based on analytic results for the two loop virtual corrections which include the full top quark mass dependence. [...]
arXiv:2309.10525; CERN-TH-2023-131.- 2023-11-18 - 13 p. - Published in : Eur. Phys. J. C 83 (2023) 1054 Fulltext: 2309.10525 - PDF; document - PDF;

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QED effects in inclusive semi-leptonic $B$ decays / Bigi, Dante (CERN ; Turin U. ; Munich, Max Planck Inst. ; Munich, Tech. U.) ; Bordone, Marzia (CERN) ; Gambino, Paolo (Turin U. ; Munich, Max Planck Inst. ; Munich, Tech. U.) ; Haisch, Ulrich (Munich, Max Planck Inst.) ; Piccione, Andrea (Turin U.)
We analyse in detail the QED corrections to the total decay width and the moments of the electron energy spectrum of the inclusive semi-leptonic $B \to X_c e \nu$ decay. Our calculation includes short-distance electroweak corrections, the complete ${\cal O}(\alpha)$ partonic terms and leading-logarithmic QED effects up to ${\cal O}(\Lambda^3_{\rm QCD}/m_b^3)$. [...]
arXiv:2309.02849; CERN-TH-2023-145; MPP-2023-186.- 2023-11-22 - 40 p. - Published in : JHEP 2311 (2023) 163 Fulltext: document - PDF; 2309.02849 - PDF;

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Revisiting semileptonic $B$ meson decays at next-to-next-to-leading order / Egner, Manuel (KIT, Karlsruhe, TTP) ; Fael, Matteo (CERN) ; Schönwald, Kay (Zurich U.) ; Steinhauser, Matthias (KIT, Karlsruhe, TTP)
We compute next-to-next-to-leading order corrections to the semileptonic decay rate of $B$ mesons for arbitrary values of the final-state quark mass. For the contribution with one massive quark in the final state, we extend the literature result and obtain analytic expressions in terms of iterated integrals. [...]
arXiv:2308.01346; P3H-23-053; TTP23-030; ZU-TH 41/23; CERN-TH-2023-151.- 2023-09-18 - 25 p. - Published in : JHEP 2309 (2023) 112 Fulltext: 2308.01346 - PDF; document - PDF;

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Hide and seek: how PDFs can conceal New Physics / Hammou, Elie (Cambridge U., DAMTP) ; Kassabov, Zahari (Cambridge U., DAMTP) ; Madigan, Maeve (Heidelberg U.) ; Mangano, Michelangelo L. (CERN) ; Mantani, Luca (Cambridge U., DAMTP) ; Moore, James (Cambridge U., DAMTP) ; Alvarado, Manuel Morales (Cambridge U., DAMTP) ; Ubiali, Maria (Cambridge U., DAMTP)
The interpretation of LHC data, and the assessment of possible hints of new physics, require the precise knowledge of the proton structure in terms of parton distribution functions (PDFs). We present a systematic methodology designed to determine whether and how global PDF fits might inadvertently 'fit away' signs of new physics in the high-energy tails of the distributions. [...]
arXiv:2307.10370; CERN-TH-2023-137.- 2023-11-16 - 48 p. - Published in : JHEP 2311 (2023) 090 Fulltext: 2307.10370 - PDF; document - PDF;

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Implications of Protecting the QCD Axion in the Dual Description / Choi, Gongjun (CERN) ; Leedom, Jacob (DESY)
The QCD axion can be be formulated in a dual description as a massive 2-form field. In this picture, the QCD axion quality problem translates into the question if there are additional 3-forms coupled to the axion other than the QCD 3-form that emerges at low energy. [...]
arXiv:2307.08733; CERN-TH-2023-117; DESY 23-095.- 2023-09-26 - 19 p. - Published in : JHEP 2309 (2023) 175 Fulltext: 2307.08733 - PDF; document - PDF;

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$\tau _{B_{s}}/\tau _{B_{d}}$ and $\Delta \Gamma _{s}$ confront new physics in $b\rightarrow s\tau \tau $ / Bordone, Marzia (CERN) ; Fernández Navarro, Mario (Southampton U.)
Several new physics scenarios that address anomalies in $B$-physics predict an enhancement of $b \rightarrow s \tau \tau$ with respect to its Standard Model prediction. Such scenarios necessarily imply modifications of the lifetime ratio $\tau_{B_{s}}/\tau_{B_{d}}$ and the lifetime difference $\Delta\Gamma_{s}$. [...]
arXiv:2307.07013; CERN-TH-2023-138.- 2023-09-22 - 13 p. - Published in : Eur. Phys. J. C 83 (2023) 842 Fulltext: 2307.07013 - PDF; document - PDF;

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Metastable cosmic strings / Buchmuller, Wilfried (DESY) ; Domcke, Valerie (CERN) ; Schmitz, Kai (Munster U.)
Many symmetry breaking patterns in grand unified theories (GUTs) give rise to cosmic strings that eventually decay when pairs of GUT monopoles spontaneously nucleate along the string cores. These strings are known as metastable cosmic strings and have intriguing implications for particle physics and cosmology. [...]
arXiv:2307.04691; CERN-TH-2023-118; MS-TP-23-37; DESY-23-117.- 2023-11-08 - 28 p. - Published in : JCAP 2311 (2023) 020 Fulltext: document - PDF; 2307.04691 - PDF;

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Classical Observables from the Exponential Representation of the Gravitational S-Matrix / Damgaard, Poul H. (Bohr Inst. ; CERN) ; Hansen, Elias Roos (Bohr Inst.) ; Planté, Ludovic (Bohr Inst.) ; Vanhove, Pierre (IPhT, Saclay)
By combining the KMOC-formalism with the exponential representation of the scattering matrix we show that the two-body scattering angle is given by the corresponding matrix element of the exponential representation. This holds to all orders in the Post-Minkowskian expansion of gravity when restricted to the conservative sector. [...]
arXiv:2307.04746; CERN-TH-2023-135; IPhT-T23/041; LAPTh-029/23.- 2023-09-26 - 37 p. - Published in : JHEP 2309 (2023) 183 Fulltext: 2307.04746 - PDF; document - PDF;

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Cosmic Superstrings Revisited in Light of NANOGrav 15-Year Data / Ellis, John (King's Coll. London ; CERN) ; Lewicki, Marek (Warsaw U.) ; Lin, Chunshan (Jagiellonian U. (main)) ; Vaskonen, Ville (Unlisted, EE ; INFN, Padua)
We analyze cosmic superstring models in light of NANOGrav 15-year pulsar timing data. A good fit is found for a string tension $G \mu \sim 10^{-12} - 10^{-11}$ and a string intercommutation probability $p \sim 10^{-3} - 10^{-1}$. [...]
arXiv:2306.17147; KCL-PH-TH/2023-38; CERN-TH-2023-126; AION-REPORT/2023-07.- 2023-11-09 - 6 p. - Published in : Phys. Rev. D 108 (2023) 103511 Fulltext: PDF;

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