# TH Articles

2021-02-25
04:20
 Semi-automated BSM model building procedures in MARTY-1.1 through a 2HDM example / Uhlrich, G. ; Mahmoudi, F. ; Arbey, A. MARTY is a C++ computer algebra system specialized for High Energy Physics that can calculate amplitudes, squared amplitudes and Wilson coefficients in a large variety of beyond the Standard Model scenarios up to the one-loop order. It is fully independent of any other framework and its main development guideline is generality, in order to be adapted easily to any type of model. [...] arXiv:2102.11551; CERN-TH-2021-025.- 2021-02-23 - 14 p. - Published in : PoS: TOOLS2020 (2020) , pp. 042 Fulltext: PDF; In : Tools for High Energy Physics and Cosmology, Lyon, France, 2 - 6 Nov 2020, pp.042

2020-11-21
04:27
 $MARTY$, a new C++ framework for automated symbolic calculations in Beyond the Standard Model physics / Uhlrich, Gregoire (IP2I, Lyon) ; Mahmoudi, Farvah (IP2I, Lyon ; CERN ; IUF, Paris) ; Arbey, Alexandre (IP2I, Lyon ; CERN ; IUF, Paris) Theoretical calculations Beyond the Standard Model (BSM) constitute a challenge for high energy physicists, but are necessary when searching for New Physics. The predictions of a BSM scenario need to be compared with experimental data and the Standard Model values in order to identify the model that fits better what we observe in particle colliders. [...] arXiv:2011.06558; CERN-TH-2020-193.- 2020-11-12 - 6 p. Fulltext: PDF; In : 40th International Conference on High Energy Physics, Prague, Czech Republic, 28 Jul - 6 Aug 2020

2020-11-13
17:36
 Function Theory for Multiloop Feynman Integrals / Duhr, Claude Precise predictions for collider observables require the computation of higher orders in perturbation theory. This usually involves the evaluation of complicated multiloop integrals, which typically give rise to complicated special functions. [...] CERN-TH-2020-192.- Geneva : CERN, 2020 - 26. - Published in : Annual Review of Nuclear and Particle Science 69 (2019) 15-39 Fulltext: PDF;

2020-11-11
05:03
 Low-Energy Probes of No-Scale SU(5) Super-GUTs / Ellis, John (King's Coll. London ; CERN ; NICPB, Tallinn) ; Evans, Jason L. (Shanghai Jiao Tong U.) ; Nagata, Natsumi (Tokyo U.) ; Olive, Keith A. (Minnesota U., Theor. Phys. Inst.) ; Velasco-Sevilla, L. (Bergen U. ; Korea Inst. Advanced Study, Seoul) We explore the possible values of the $\mu \to e \gamma$ branching ratio, $\text{BR}(\mu\rightarrow e\gamma)$, and the electron dipole moment (eEDM), $d_e$, in no-scale SU(5) super-GUT models with the boundary conditions that soft supersymmetry-breaking matter scalar masses vanish at some high input scale, $M_{\rm in}$, above the GUT scale, $M_{\rm GUT}$. We take into account the constraints from the cosmological cold dark matter density, $\Omega_{CDM} h^2$, the Higgs mass, $M_h$, and the experimental lower limit on the lifetime for $p \to K^+ \bar \nu$, the dominant proton decay mode in these super-GUT models. [...] arXiv:2011.03554; KCL-PH-TH/2020-61; CERN-TH-2020-172; UMN-TH-4002/20; FTPI-MINN-20/33.- 2021-02-04 - 45 p. - Published in : Eur. Phys. J. C 81 (2021) 120 Article from SCOAP3: PDF; Fulltext: PDF;

2020-11-03
04:14
 Leading-Color Two-Loop QCD Corrections for Three-Photon Production at Hadron Colliders / Abreu, S. (CERN ; UCLA) ; Page, B. (LPENS, Paris) ; Pascual, E. (Freiburg U.) ; Sotnikov, V. (Munich, Max Planck Inst.) We compute the two-loop helicity amplitudes for the production of three photons at hadron colliders in QCD at leading-color. Using the two-loop numerical unitarity method coupled with analytic reconstruction techniques, we obtain the decomposition of the two-loop amplitudes in terms of master integrals in analytic form. [...] arXiv:2010.15834; CERN-TH-2020-176; FR-PHENO-2020-016; MPP-2020-190.- 2021-01-14 - 29 p. - Published in : JHEP 2101 (2021) 078 Article from SCOAP3: PDF; Fulltext: PDF;

2020-10-29
05:41
 Analytic integration of soft and collinear radiation in factorised QCD cross sections at NNLO / Magnea, Lorenzo (CERN ; Turin U. ; INFN, Turin) ; Pelliccioli, Giovanni (Wurzburg U.) ; Signorile-Signorile, Chiara (Turin U. ; INFN, Turin ; KIT, Karlsruhe, Dept. Phys.) ; Torrielli, Paolo (Turin U. ; INFN, Turin) ; Uccirati, Sandro (Turin U. ; INFN, Turin) Within the framework of local analytic sector subtraction, we present the full analytic integration of double-real and real-virtual local infrared counterterms that enter NNLO QCD computations with any number of massless final-state partons. We show that a careful choice of phase-space mappings leads to simple analytic results, including non-singular terms, that can be obtained with conventional integration techniques.. arXiv:2010.14493; P3H-20-061; TTP20-036; CERN-TH-2020-178.- 2021-02-03 - 42 p. - Published in : JHEP 2102 (2021) 037 Article from SCOAP3: PDF; Fulltext: PDF;

2020-10-22
04:02
 Model-independent energy budget for LISA / Giese, Felix (DESY) ; Konstandin, Thomas (DESY) ; Schmitz, Kai (CERN) ; Van De Vis, Jorinde (DESY) We provide an easy method to obtain the kinetic energy fraction in gravitational waves, generated during a cosmological first-order phase transition, as a function of only the wall velocity and quantities that can be determined from the particle physics model at the nucleation temperature. This generalizes recent work that achieved this goal for detonations. [...] arXiv:2010.09744; DESY-20-173; DESY 20-173; CERN-TH-2020-170.- 2021-01-29 - 31 p. - Published in : JCAP 2101 (2021) 072 Fulltext: PDF;

2020-10-21
04:31
 The Schwarzschild-Tangherlini metric from scattering amplitudes in various dimensions / Mougiakakos, Stavros (IPhT, Saclay) ; Vanhove, Pierre (IPhT, Saclay ; Higher Sch. of Economics, Moscow ; CERN) We derive the static Schwarzschild-Tangherlini metric by extracting the classical contributions from the multi-loop vertex functions of a graviton emitted from a massive scalar field. At each loop orders the classical contribution is proportional to a unique master integral given by the massless sunset integral. [...] arXiv:2010.08882; IPhT-t20/053; CERN-TH-2020-168.- 2021-01-05 - 31 p. - Published in : Phys. Rev. D 103 (2021) 026001 Article from SCOAP3: PDF; Fulltext: PDF;

2020-10-15
04:27
 The Present and Future of Four Tops / Banelli, Giovanni (Munich, Tech. U.) ; Salvioni, Ennio (CERN) ; Serra, Javi (Munich, Tech. U.) ; Theil, Tobias (Munich, Tech. U.) ; Weiler, Andreas (Munich, Tech. U.) We study the phenomenology of a strongly-interacting top quark at future hadron and lepton colliders, showing that the characteristic four-top contact operators give rise to the most significant effects. We demonstrate the extraordinary potential of a 100 TeV proton-proton collider to directly test such non-standard interactions in four-top production, a process that we thoroughly analyze in the same-sign dilepton and trilepton channels, and explore in the fully hadronic channel. [...] arXiv:2010.05915; TUM-HEP-1286-20; CERN-TH-2020-166.- 2021-02-04 - 34 p. - Published in : JHEP 2102 (2021) 043 Article from SCOAP3: PDF; Fulltext: PDF;

2020-09-26
04:14
 MeV-scale Seesaw and Leptogenesis / Domcke, Valerie (CERN ; Ecole Polytechnique, Lausanne) ; Drewes, Marco (Leuven U.) ; Hufnagel, Marco (DESY) ; Lucente, Michele (Louvain U.) We study the type-I seesaw model with three right-handed neutrinos and Majorana masses below the pion mass. In this mass range, the model parameter space is not only strongly constrained by the requirement to explain the light neutrino masses, but also by experimental searches and cosmological considerations. [...] arXiv:2009.11678; CERN-TH-2020-158; DESY-20-159; DESY 20-159.- 2021-01-28 - 17 p. - Published in : JHEP 2101 (2021) 200 Fulltext: PDF;