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# CERN Preprints

2021-04-22
11:42
 Non-abelian infrared divergences on the celestial sphere / Magnea, Lorenzo We consider the infrared factorisation of non-abelian multi-particle scattering amplitudes, and we study the form of the universal colour operator responsible for infrared divergences, when expressed in terms of coordinates on the `celestial sphere' intersecting the future light-cone at asymptotic distances. [...] CERN-TH-2021-063 ; arXiv:2104.10254. - 23 p. Fulltext

2021-04-22
11:42
 $S$-matrix approach to general gravity and beyond / Vanhove, Pierre In this text we outline the motivation for developping a quantum $S$-matrix approach for the classical gravitational two-body scattering. [...] arXiv:2104.10148 ; IPhT-T21/019 ; CERN-TH-2021-062. - 8 p. Fulltext

2021-04-22
11:42
 Geant4 FTF model description of the latest data by the NA61/SHINE collaboration on ${\rm ^{40}Ar+{}^{45}Sc}$ interactions / Galoyan, A. (Dubna, JINR) ; Ribon, A. (CERN) ; Uzhinsky, V. (Dubna, JINR) It is shown that the Geant4 FTF model, which does not include the simulation of the hard parton-parton scattering and the formation of the quark-gluon plasma (QGP), describes well the NA61/SHINE data on $\pi^-$ meson distributions for the interactions at $\sqrt{s_{NN}}=$ 5.2, 6.1, 7.6 and 8.8 GeV. [...] arXiv:2104.00937. - 5 p. Fulltext

2021-04-22
10:04
 IdeaSquare progress report 2019-2020 / CERN ; Leveratto, Luciana IdeaSquare is a place, a facility, an experiment. [...] 2021.

2021-04-21
06:17
 The long journey to the Higgs boson and beyond at the LHC (with Highlights from ATLAS) / Jenni, Peter (Freiburg U. ; CERN) Since 2010 the experiments at the Large Hadron Collider (LHC) investigate particle physics at the highest collision energies ever achieved in a laboratory. [...] 2019. - 19 p.

2021-04-21
06:17
 LHCb highlights / Wilkinson, Guy (Oxford U. ; CERN) The importance of flavour physics as a method to search for non-Standard Model effects is explained. [...] 2019. - 17 p.

2021-04-21
06:17
 Technological Inventions at CERN / Taylor, Thomas (CERN) The recent achievements of the experiments at CERN are in part due to the extraordinary development of the Organization over the more than 60 years of its existence. [...] 2019. - 15 p.

2021-04-21
06:17
 Search for Dark Sector Physics in Missing Energy Events in the NA64 Experiment / Kirsanov, Mikhail (Moscow, INR) A search is performed for a new sub-GeV vector boson (A′) mediated production of Dark Matter (χ) in the fixed-target experiment, NA64, at the CERN SPS. [...] 2019. - 17 p.

2021-04-21
04:04
 Looking at the NANOGrav Signal Through the Anthropic Window of Axion-Like Particles / Sakharov, Alexander S. (Manhattan Coll., Riverdale ; CERN) ; Eroshenko, Yury N. (Moscow, INR) ; Rubin, Sergey G. (Moscow Phys. Eng. Inst. ; Kazan State U. ; Kazan, IME) We explore the inflationary dynamics leading to formation of closed domain walls in course of evolution of an axion like particle (ALP) field whose Peccei-Quinn-like phase transition occurred well before inflationary epoch. [...] arXiv:2104.08750. - 35 p. Fulltext

2021-04-21
04:04
 Higgs analysis with quantum classifiers / Belis, Vasilis (ETH, Zurich (main)) ; González-Castillo, Samuel (Oviedo U.) ; Reissel, Christina (ETH, Zurich (main)) ; Vallecorsa, Sofia (CERN) ; Combarro, Elías F. (Oviedo U.) ; Dissertori, Günther (ETH, Zurich (main)) ; Reiter, Florentin (Zurich, ETH-CSCS/SCSC) We have developed two quantum classifier models for the $t\bar{t}H(b\bar{b})$ classification problem, both of which fall into the category of hybrid quantum-classical algorithms for Noisy Intermediate Scale Quantum devices (NISQ). [...] arXiv:2104.07692. - Fulltext