CERN Accelerating science

CERN Preprints

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The CMS Phase-1 pixel detector -- experience and lessons learned from two years of operation / Vormwald, Benedikt Roland (Hamburg U.) /CMS Collaboration
In 2017, CMS has installed a new pixel detector with 124M channels that features full 4-hit coverage in the tracking volume ($\eta<2.5$) and is capable to withstand instantaneous luminosities of $2\cdot10^{34}\,\mathrm{cm}^{-2}\mathrm{s}^{-1}$ and beyond. By now the detector has been successfully operated for two years in proton and heavy ion collisions. [...]
CMS-CR-2019-019.- Geneva : CERN, 2019 - 11 p. Fulltext: PDF;
In : International Workshop on Semiconductor Pixel Detectors for Particles and Imaging (PIXEL2018), Taipei, Taiwan, 10 - 14 Dec 2018

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Results and prospects with the CMS-TOTEM Precision Proton Spectrometer / Vilela Pereira, Antonio (Rio de Janeiro State U.) /CMS and TOTEM Collaborations
The PPS (Precision Proton Spectrometer) detector system consists of silicon tracking stations as well as timing detectors to measure both the position and direction of protons and their time-of-flight with high precision. They are located at around 200--220~m from the interaction point in the very forward region on both sides of the CMS experiment. [...]
CMS-CR-2019-096.- Geneva : CERN, 2019 - 7 p. Fulltext: PDF;
In : The XXVII International Workshop on Deep Inelastic Scattering and Related Subjects, Turin, Italy, 8 - 12 Apr 2019

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A tale of two exponentiations in ${\cal N}=8$ supergravity / Di Vecchia, Paolo ; Luna, Andrés ; Naculich, Stephen G. ; Russo, Rodolfo ; Veneziano, Gabriele ; White, Chris D.
The structure of scattering amplitudes in supergravity theories continues to be of interest. [...]
arXiv:1908.05603 ; BOW-PH-166 ; NORDITA 2019-076 ; QMUL-PH-19-20 ; CERN-TH-2019-133.
- 14 p.

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Search for production of four top quarks in final states with same-sign or multiple leptons in proton-proton collisions at $\sqrt{s}= $ 13 TeV
The standard model (SM) production of four top quarks (${\mathrm{t\bar{t}}\mathrm{t\bar{t}}} $) in proton-proton collision is studied by the CMS Collaboration. [...]
CERN-EP-2019-163 ; CMS-TOP-18-003-003.
- 2019.
Additional information for the analysis - CMS AuthorList - Fulltext

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Summary of the Mechanical Performances of the 1.5 m Long Models of the Nb$^3$Sn Low-$\beta$ Quadrupole MQXF / Vallone, Giorgio (LBL, Berkeley) ; Ambrosio, Giorgio (Fermilab) ; Anderssen, Eric C (LBL, Berkeley) ; Bajas, Hugo (CERN) ; Bourcey, Nicolas (CERN) ; Cheng, Daniel W (LBL, Berkeley) ; Chlachidze, Guram (Fermilab) ; Ferracin, Paolo (CERN) ; Grosclaude, Philippe (CERN) ; Guinchard, Michael (CERN) et al.
The Nb3Sn quadrupole MQXF is being developed as a part of the LHC High Luminosity upgrade. [...]
- 2019. - 5 p.

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Measurement of angular and momentum distributions of charged particles within and around jets in Pb+Pb and $pp$ collisions at $\sqrt{s_{\mathrm{NN}}} = 5.02$ TeV with the ATLAS detector / ATLAS Collaboration
Studies of the fragmentation of jets into charged particles in heavy-ion collisions can provide information about the mechanism of jet-quenching by the hot and dense QCD matter created in such collisions, the quark-gluon plasma. [...]
arXiv:1908.05264 ; CERN-EP-2019-158.
- 2019. - 43 p, 43 p.
Fulltext - Previous draft version - Fulltext

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Numerical exploration of three relativistic particles in a finite volume including two-particle resonances and bound states / Romero-López, Fernando (Valencia U., IFIC) ; Sharpe, Stephen R. (Washington U., Seattle) ; Blanton, Tyler D. (Washington U., Seattle) ; Briceño, Raúl A. (Jefferson Lab ; Old Dominion U.) ; Hansen, Maxwell T. (CERN)
In this work, we use an extension of the quantization condition, given in Ref. [...]
arXiv:1908.02411 ; JLAB-THY-19-3011.
- 42 p.
JLAB - Fulltext

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Search for supersymmetry in proton-proton collisions at 13 TeV in final states with jets and missing transverse momentum
Results are reported from a search for supersymmetric particles in the final state with multiple jets and large missing transverse momentum. [...]
CERN-EP-2019-152 ; CMS-SUS-19-006-003.
- 2019.
Additional information for the analysis - CMS AuthorList - Fulltext

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Beam position monitors for antiprotons / Bossart, Rudolf
- 1978. - 44 p.
Full text

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Measurement of $\psi(2S)$ production cross-sections in proton-proton collisions at $\sqrt{s} = 7$ and 13 TeV
The cross-sections of $\psi(2S)$ meson production in proton-proton collisions at $\sqrt{s}=13~\mathrm{TeV}$ are measured with a data sample collected by the LHCb detector corresponding to an integrated luminosity of $275~p\mathrm{b}^{-1}$. [...]
arXiv:1908.03099 ; CERN-EP-2019-150 ; LHCB-PAPER-2018-049.
- 2019.
Fulltext - Related data file(s)

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