# CERN Published Articles

Derniers ajouts:
2022-08-05
06:25
 Evolution of open charm production with event multiplicity with ALICE / Giacalone, Marco (INFN, Bologna ; Bologna U.) /ALICE Collaboration The study of charm production as a function of multiplicity is important to investigate the role of multi-parton interactions, color-reconnection mechanisms, and spectra modification in high multiplicity events with respect to minimum bias ones, and to dig into the possible presence of collective phenomena in high-multiplicity environments. Moreover, charm cross-section measurements in pp collisions provide a useful test of QCD calculations while measurements in p--Pb collisions are useful to analyze Cold Nuclear Matter effects. In this contribution, recent measurements of the evolution of the production yields with the event charged-particle multiplicity of prompt D-mesons and leptons from heavy-flavour hadron decays in pp collisions at $\sqrt{s} =$ 13 TeV are discussed. The results are compared to the $\mathrm{J/\Psi}$ measurement and to model calculations. [...] 2021 - 9 p. - Published in : PoS CHARM2020 (2021) 055 Fulltext: PDF; In : 10th International Workshop on Charm Physics (CHARM 2020), Online, Mexico, 31 May - 4 June 2021, pp.055

2022-08-05
06:25
 Overview of CMS Results — Recent Highlights / Clerbaux, B (Brussels U., IIHE) /CMS Collaboration In these proceedings, highlights of the CMS experiment are presented, with a focus on the latest results obtained when analysing the whole LHC Run 2 dataset. The presentation of the CMS results is divided into three main parts. [...] 2021 - 20 p. - Published in : Acta Phys. Pol. B 52 (2021) 889 Fulltext: PDF; In : XXVII Cracow Epiphany Conference on Future of particle physics, Online, Poland, Online, 7 - 10 Jan 2021, pp.889

2022-08-05
06:25
 Recent results in conventional and exotic heavy hadron spectroscopy with CMS / Pompili, A (Bari U. ; INFN, Bari) /CMS Collaboration Recents results in conventional and exotic heavy hadron spectroscopy with the CMS detector are presented. They include Λ**b and B(*)c (2S) excited states, the search for exotic states in ϒ(1S) μ+μ− final states, the first observation of the B0s → X(3872) ϕ decay mode and the evidence of X(3872) production in Heavy Ion collisions.. 2021 - 5 p. - Published in : Nucl. Part. Phys. Proc. 312-317 (2021) 105-109 In : 23rd International Conference in Quantum Chromodynamics (QCD 20), Montpellier, France, 27 - 30 Oct 2020, pp.105-109

2022-08-05
06:25
 Mixing and CP Violation in Charm Mesons at LHCb / Shields, E (Milan Bicocca U. ; INFN, Milan Bicocca) /LHCb Collaboration In 2019, LHCb reported the first observation of direct CP violation in the charm sector. As of yet indirect CP violation has not been observed but measurements of this and mixing is essential to our understanding of the Standard Model. [...] 2021 - 6 p. - Published in : Acta Phys. Pol. B 52 (2021) 1075 Fulltext: PDF; In : XXVII Cracow Epiphany Conference on Future of particle physics, Online, Poland, Online, 7 - 10 Jan 2021, pp.1075

2022-08-05
06:25
 Associated production of a vector boson and jets / Vazzoler, F (U. Trieste (main) ; INFN, Trieste) /CMS Collaboration The production cross section of vector bosons recoiling against jets is studied, with CMS data, differentially as a function of the transverse momentum and angular correlations of the final state particles. The measurements are confronted with different state-of-the-art theory predictions that include next-to-leading-order calculations and matrix-element plus parton shower event simulations.. 2021 - 5 p. - Published in : Nucl. Part. Phys. Proc. 312-317 (2021) 17-21 In : 23rd International Conference in Quantum Chromodynamics (QCD 20), Montpellier, France, 27 - 30 Oct 2020, pp.17-21

2022-08-05
06:25
 Non-monotonic dependence of heat loads induced by electron cloud on bunch population at the LHC / Skripka, Galina (CERN ; Dubna, JINR) ; Iadarola, Giovanni (CERN) ; Mether, Lotta (CERN) ; Rumolo, Giovanni (CERN) Electron cloud effects are among the main performance limitations for the operation of the Large Hadron Collider with 25 ns bunch spacing. Electrons impacting on the beam screens of the superconducting magnets induce a significant heat load reaching values close to the full cooling capacity available from the cryogenic system in some LHC sectors. [...] 2022 - 9 p. - Published in : Eur. Phys. J. Plus 137 (2022) 849 Fulltext: PDF;

2022-08-05
06:25
 Heat transfer of flow boiling carbon dioxide in vertical upward direction / Schmid, David (CERN ; Ecole Polytechnique, Lausanne) ; Verlaat, Bart (CERN) ; Petagna, Paolo (CERN) ; Revellin, Rémi (INSA, Villeurbanne) ; Schiffmann, Jürg (Ecole Polytechnique, Lausanne) Heat transfer measurements of flow boiling Carbon Dioxide (CO$_2$) in vertical upward direction have been carried out with a dedicated test facility at the European Organization for Nuclear Research (CERN). The investigation covers saturation temperatures within a range of $-25 \degree \textrm{C} \leq T_{\mathrm{sat}} +5 \degree \textrm{C}$, mass velocities from 100kg m$^{-2}$ s$^{-1}$ $\leq G \leq$ 450 kg m$^{-2}$ s$^{-1}$ and heat fluxes of 5.3 kW m$^{-2}$ and 11.4 kW m$^{-2}$. [...] 2022 - 15 p. - Published in : Int. J. Heat Mass Transf. 196 (2022) 123246 Fulltext: PDF;

2022-08-05
06:25
 Design rules for time of flight Positron Emission Tomography (ToF-PET) heterostructure radiation detectors / Krause, Philip (Cranfield U.) ; Rogers, Edith (Cranfield U.) ; Birowosuto, Muhammad Danang (Singapore Natl. U. (main)) ; Pei, Qibing (UCLA) ; Auffray, Etiennette (CERN) ; Vasil'ev, Andrey N (Lomonosov Moscow State U.) ; Bizarri, Gregory (Cranfield U.) Despite the clinical acceptance of ToF-PET, there is still a gap between the technology's performance and the end-user's needs. Core to bridging this gap is the ability to develop radiation detectors combining a short attenuation length and a sub-nanosecond time response. [...] 2022 - 14 p. - Published in : Heliyon 8 (2022) e09754 Fulltext: PDF;

2022-08-05
06:25
 Direct CPV in Charm decays at LHCb / Pica, Lorenzo (INFN, Pisa ; Pisa, Scuola Normale Superiore) /LHCb Collaboration Two searches for direct 𝐶𝑃 violation in charm decays at LHCb are presented in this document. The first is a measurement of $\mathcal{A}_{𝐶𝑃}$ $(𝐷^+_{(𝑠)} → h^+𝜋^0)$ and $\mathcal{A}_{𝐶𝑃}$ $(𝐷^+_{(𝑠)} → h^+𝜂)$, where $(h^+ = 𝜋^+, 𝐾^+)$. The second is the measurement of $\mathcal{A}_{𝐶𝑃}$ $(𝐷^0 →𝐾^0_S𝐾^0_S)$. The latter and five of the results obtained in the former represent the world-best measurement of these quantities up to now.. 2021 - 11 p. - Published in : PoS CHARM2020 (2021) 059 Fulltext: PDF; In : 10th International Workshop on Charm Physics (CHARM 2020), Online, Mexico, 31 May - 4 June 2021, pp.059

2022-08-05
06:25
 Charm spectroscopy from amplitude analyses in $B_{(s)}$ decays at LHCb / Cruz Torres, Melissa Maria (Honduras U.) /LHCb Collaboration Amplitude analysis of $B$ mesons decays offer a good laboratory for charm spectroscopy studies. Theoretical and experimental models of Quantum Chromodynamics can be tested. [...] 2021 - 13 p. - Published in : PoS CHARM2020 (2021) 011 Fulltext: PDF; In : 10th International Workshop on Charm Physics (CHARM 2020), Online, Mexico, 31 May - 4 June 2021, pp.011