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CERN Preprints

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2018-12-12
09:54
Evidence for light-by-light scattering and limits on axion-like-particles from ultraperipheral PbPb collisions at 5 TeV / Niedziela, Jeremi (CERN) /CMS Collaboration
A measurement of light-by-light scattering, $\gamma\gamma \rightarrow \gamma\gamma$, in ultraperipheral PbPb collisions at a centre-of-mass energy per nucleon pair of $5.02$ TeV is reported. The analysis is conducted using a data sample corresponding to an integrated luminosity of $390~\mu \rm{b}^{-1}$ recorded by the CMS experiment at the LHC. [...]
CMS-CR-2018-403.- Geneva : CERN, 2018 - 6 p. Fulltext: PDF;
In : Hard Probes 2018: International Conference on Hard and Electromagnetic Probes of High-Energy Nuclear Collisions, Aix-les-bains, France, 1 - 5 Oct 2018

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2018-12-12
09:54
Particle Flow reconstruction in the Level-1 trigger at CMS for the HL-LHC / Petrucciani, Giovanni (CERN) /CMS Collaboration
With the planned addition of the tracking information in the Level-1 trigger in CMS for the HL-LHC, the algorithms for the Level-1 trigger can be completely reconceptualized. Following the example for offline reconstruction in CMS to use complementary subsystem information and mitigate pileup, we explore the feasibility of using Particle Flow-like and pileup-per-particle identification techniques at the hardware trigger level. [...]
CMS-CR-2018-401.- Geneva : CERN, 2018 - 6 p. Fulltext: PDF;
In : 23rd International Conference on Computing in High Energy and Nuclear Physics, CHEP 2018, Sofia, Bulgaria, 9 - 13 Jul 2018

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2018-12-12
09:12
Charged Higgs searches at CMS / Yu, Geum Bong (Seoul Natl. U.) /CMS Collaboration
Observation of charged Higgs bosons would be a strong evidence of new physics beyond the standard model. An overview of the latest results on the charged Higgs boson searches, as of August 2018, performed by the CMS collaboration is presented..
CMS-CR-2018-389.- Geneva : CERN, 2018 - 5 p. Fulltext: PDF;
In : 25th Rencontres du Vietnam, Quy Nhon, Vietnam, 5 - 11 Aug 2018

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2018-12-12
09:12
Search for charged Higgs bosons with the $\text{H}^{\pm} \rightarrow \tau^{\pm}\nu_{\tau}$ decay channel / Eysermans, Jan (Puebla U., Inst. Fis.) ; Pedraza Morales, Maria Isabel (Puebla U., Inst. Fis.) /CMS Collaboration
A search for charged Higgs bosons decaying into a tau lepton and a neutrino is presented in the hadronic and leptonic final states. The search is based on the 13 TeV dataset with 35.9 fb$^{-1}$ of integrated luminosity collected with the CMS experiment in 2016. [...]
CMS-CR-2018-361.- Geneva : CERN, 2018 - 10 p. Fulltext: PDF;
In : 7th workshop on prospects for charged Higgs discovery at colliders, Uppsala, Sweden, 25 - 28 Sep 2018

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2018-12-12
09:12
Characterization of the first prototype of the Silicon-Strip readout ASIC (SSA) for the CMS Outer-Tracker phase-2 upgrade / Caratelli, Alessandro (CERN) ; Scarfi', Simone (CERN) ; Ceresa, Davide (CERN) ; De Clercq, Jarne Theo (Vrije U., Brussels) ; Haranko, Mykyta (DESY) ; Jan Kaplon ; Kloukinas, Konstantinos (CERN) ; Yusuf Leblebici
The silicon strip readout ASIC (SSA) for the CMS Outer Tracker PS module was prototyped in a \(65\,nm\) CMOS technology and characterized utilizing a custom made test bench based on the FC7 \(\mu\)TCA FPGA card. The ASIC has been evaluated and characterised under different working temperatures and radiation levels up to \(200\,Mrad\). [...]
CMS-CR-2018-286.- Geneva : CERN, 2018 - 6 p. Fulltext: PDF;
In : Topical Workshop on Electronics for Particle Physics, Antwerp, Belgique, 17 - 21 Sep 2018

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2018-12-12
04:03
Observation angles, Fermi coordinates, and the Geodesic-Light-Cone gauge / Fanizza, Giuseppe ; Gasperini, Maurizio ; Marozzi, Giovanni ; Veneziano, Gabriele
We show that the angular directions locally measured by a static geodesic observer in a generic cosmological background and expressed in the system of Fermi Normal Coordinates always coincide with those expressed in the Geodesic-Light-Cone (GLC) gauge, up to a local transformation which exploits the residual gauge freedom of the GLC coordinates. [...]
BA-TH/716-18 ; CERN-TH-2018-253 ; arXiv:1812.03671.
- 14 p.
Preprint

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2018-12-12
04:03
Variational Autoencoders for New Physics Mining at the Large Hadron Collider / Cerri, Olmo (Caltech) ; Nguyen, Thong Q. (Caltech) ; Pierini, Maurizio (CERN) ; Spiropulu, Maria (Caltech) ; Vlimant, Jean-Roch (Caltech)
Using variational autoencoders trained on known physics processes, we develop a one-side p-value test to isolate previously unseen processes as outlier events. [...]
arXiv:1811.10276.
- 17 p.
Fulltext

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2018-12-12
04:03
Probing the strange Higgs coupling at $e^+e^-$ colliders using light-jet flavor tagging / Duarte-Campderros, J. (Cantabria Inst. of Phys.) ; Perez, G. (CERN) ; Schlaffer, M. (Tel Aviv U.) ; Soffer, A. (Weizmann Inst.)
We propose a method to probe the coupling of the Higgs to strange quarks by tagging strange jets at future electron-positron colliders. [...]
arXiv:1811.09636.
- 8 p.
Fulltext

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2018-12-11
04:09
The MORA project / MORA Collaboration
The MORA (Matter's Origin from the RadioActivity of trapped and oriented ions) project aims at measuring with unprecedented precision the D correlation in the nuclear beta decay of trapped and oriented ions. [...]
arXiv:1812.02970.
- 14 p.
Full text

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2018-12-11
04:09
A Fresh Look at the Calculation of Tunneling Actions in Multi-Field Potentials / Espinosa, J.R. (Barcelona, IFAE ; ICREA, Barcelona ; CERN) ; Konstandin, T. (DESY)
The quantum decay of a metastable vacuum is exponentially suppressed by a tunneling action that can be calculated in the semi-classical approximation as the Euclidean action of a bounce that interpolates between the false and true phases. [...]
arXiv:1811.09185 ; DESY-18-206 ; CERN-TH-2018-245.
- 16 p.
Fulltext

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