CERN Accelerating science

CERN Preprints

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2017-10-20
16:53
Functional Tests of 2S Modules for the CMS Phase-2 Tracker Upgrade with a microTCA-based Readout System / Preuten, Marius (Aachen, Tech. Hochsch.) /CMS Collaboration
First full size 2S module prototypes for the CMS Phase-2 Tracker Upgrade have been assembled. With two sensors with realistic geometries and 16 CBC2 readout chips on two front-end hybrids these allow to study the characteristics of these complex objects.A microTCA based readout system was developed to test multiple front-end hybrids simultaneously. [...]
CMS-CR-2017-367.- Geneva : CERN, 2017 - 8 p. Fulltext: PDF;
In : Topical Workshop on Electronics for Particle Physics, Santa Cruz, Ca, United States Of America, 11 - 14 Sep 2017

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2017-10-20
16:53
Design of the new front-end electronics for the readout of the upgraded CMS electromagnetic calorimeter for the HL-LHC / Cometti, Simona (INFN, Turin) ; Mazza, Gianni (INFN, Turin) /CMS Collaboration
The Compact Muon Solenoid detector was originally designed to operate for about ten years, for LHC instantaneous luminosities up to $1 \cdot 10^{34}$ cm$^{-2}$ s$^{-1}$ and integrated luminosity of 500 fb$^{-1}$. The High Luminosity LHC will increase the instantaneous luminosity by about a factor of 5 from current levels and CMS will accumulate an integrated luminosity of 3000 fb$^{-1}$ by about 2035. With such high luminosity the electromagnetic calorimeter of CMS will have to cope with a challenging increase in the number of interactions per bunch crossing and in radiation levels. [...]
CMS-CR-2017-352.- Geneva : CERN, 2017 - 6 p. Fulltext: PDF;
In : Topical Workshop on Electronics for Particle Physics, Santa Cruz, Ca, United States Of America, 11 - 14 Sep 2017

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2017-10-20
16:53
The CMS trigger in Run 2 / Tosi, Mia (CERN) /CMS Collaboration
During its second period of operation (Run 2) which started in 2015, the LHC will reach a peak instantaneous luminosity of approximately 2$\times 10^{34}$~cm$^{-2}s^{-1}$ with an average pile-up of about 55, far larger than the design value. Under these conditions, the online event selection is a very challenging task. [...]
CMS-CR-2017-340.- Geneva : CERN, 2017 - 7 p. Fulltext: PDF;
In : 2017 European Physical Society Conference on High Energy Physics, Venice, Italy, 05 - 12 Jul 2017

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2017-10-20
16:53
Precision measurements of electroweak parameters / Savin, Alexander (Wisconsin U., Madison) /ATLAS and CMS Collaborations
A set of selected precise measurements of the SM parameters from the LHC experiments is discussed. Results on W-mass measurement and forward-backward asymmetry in production of the Drell--Yan events in both dielectron and dimuon decay channels are presented together with results on the effective mixing angle measurements. [...]
CMS-CR-2017-336.- Geneva : CERN, 2017 - 9 p. Fulltext: PDF;
In : 37th International Symposium on Physics in Collision (PIC 2017), Prague, Czech Republic, 4 - 8 Sep 2017

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2017-10-20
16:53
The CMS ECAL Upgrade for Precision Crystal Calorimetry at the HL-LHC / Jofrehei, Arash (IPM, Tehran) /CMS Collaboration
The Compact Muon Solenoid Experiment (CMS) is operating at the Large Hadron Collider (LHC) with proton-proton collisions at 13 TeV center-of-mass energy and at a bunch spacing of 25 ns. Challenging running conditions for CMS are expected after the High-Luminosity upgrade of the LHC (HL-LHC). [...]
CMS-CR-2017-324.- Geneva : CERN, 2017 - 4 p. Fulltext: PDF;
In : 14th International Conference on Inorganic Scintillators and their Applications, Chamonix, France, 18 - 22 Sep 2017

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2017-10-20
07:41
A Lower Bound on Inelasticity in Pion-Pion Scattering / Martin, André ; Roy, S.M.
Assuming that the pion-pion scattering amplitude and its absorptive part are analytic inside an ellipse in $t$- plane with foci $t=0$, $u=0$ and right extremity $t=4 m_{\pi}^2 +\epsilon $, ($\epsilon > 0$), except for cuts prescribed by Mandelstam representation for $t\geq 4 m_{\pi}^2$, $u\geq 4 m_{\pi}^2$ , and bounded by $s^N$ on the boundary of this domain, we prove that for $s\rightarrow \infty$, \sigma_{inel} (s) > \frac{Const}{s^{5/2} }\exp {[-\frac{\sqrt{s}}{4} (N+5/2) \ln {s} ]}..
arXiv:1710.07140 ; CERN-TH-2017-215.
- 10 p.

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2017-10-20
07:41
Transverse Momentum and Multiplicity Fluctuations in Ar+Sc Collisions at the CERN SPS from NA61/SHINE / Andronov, Evgeny
The NA61/SHINE experiment aims to discover the critical point of strongly interacting matter and study the properties of the onset of deconfinement. [...]
arXiv:1710.06197.
- 5 p.
Preprint

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2017-10-20
07:41
Ergodicity of the LLR method for the Density of States / Cossu, Guido ; Lucini, Biagio ; Pellegrini, Roberto ; Rago, Antonio
The LLR method is a novel algorithm that enables us to evaluate the density of states in lattice gauge theory. [...]
CERN-TH-2017-213 ; arXiv:1710.06250.
- 8 p.
Preprint

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2017-10-20
07:41
Ward Identity and Scattering Amplitudes in Nonlinear Sigma Models / Low, Ian (Argonne ; Northwestern U. ; CERN) ; Yin, Zhewei (Northwestern U.)
We present a Ward identity for nonlinear sigma models using generalized nonlinear shift symmetries, without introducing current algebra or coset space. [...]
arXiv:1709.08639.
- 5 p.
Preprint

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2017-10-20
07:41
Features of W production in p-p, p-Pb and Pb-Pb collisions / Arleo, François (Ecole Polytechnique) ; Chapon, Émilien (CERN ; Ecole Polytechnique) ; Paukkunen, Hannu (Helsinki Inst. of Phys. ; Jyvaskyla U. ; Santiago de Compostela U. ; Santiago de Compostela U., IGFAE)
We consider the production of inclusive W bosons in variety of high-energy hadronic collisions: p--p, p--$\overline{\rm p}$, p--Pb, and Pb--Pb. [...]
arXiv:1709.08351.
- 5 p.
Preprint

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