CERN Accelerating science

CMS Notes

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2017-06-22
17:07
Thin Double-gap RPCs for the Phase-2 Upgrade of the CMS Muon System / Lee, Kyong Sei (Korea U.) ; Park, Sung Keun (Korea U.)
High-sensitive double-gap phenolic Resistive Plate Chambers are studied for the Phase-2 upgrade of the CMS muon system at high pseudorapidity $\eta$. Whereas the present CMS RPCs have a gas gap thickness of 2 mm, we propose to use thinner gas gaps, which will improve the performance of these RPCs. [...]
CMS-NOTE-2017-006; CERN-CMS-NOTE-2017-006.- Geneva : CERN, 2017 - 10 p. Fulltext: PDF;

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2017-06-22
11:22
Thin Double-gap RPCs for the Phase-2 Upgrade of the CMS Muon System / Lee, Kyong Sei (Korea U.) ; Park, Sung Keun (Korea U.)
High-sensitive double-gap phenolic Resistive Plate Chambers are studied for the Phase-2 upgrade of the CMS muon system at high pseudorapidity $\eta$. Whereas the present CMS RPCs have a gas gap thickness of 2 mm, we propose to use thinner gas gaps, which will improve the performance of these RPCs. [...]
CMS-NOTE-2017-005; CERN-CMS-NOTE-2017-005.- Geneva : CERN, 2017 - 10 p. Fulltext: PDF;

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2017-06-06
10:17
Object definitions for top quark analyses at the particle level / CMS Collaboration /CMS Collaboration
The definition of the top quark at the particle level (pseudo-top) is discussed as a fundamental aspect of performing current and future measurements of differential production cross sections in both $\mathrm{t}\overline{\mathrm{t}}$ and single top quark production. Starting from initial studies performed in the context of the LHCtopWG, an optimization of the definition of pseudo-tops is proposed in order to maximize the correlation of the reconstructed quantities with the parton-level definition. The implementations and their optimization are performed using RIVET as a common framework to avoid the introduction of a dependence on a specific Monte Carlo event generator..
CMS-NOTE-2017-004; CERN-CMS-NOTE-2017-004.- Geneva : CERN, 2017 - 26 p. Fulltext: PDF;

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2017-05-09
10:50
P-Type Silicon Strip Sensors for the Future CMS Tracker / The Tracker Group of the CMS Collaboration /CMS Collaboration
The upgrade to the High-Luminosity LHC (HL-LHC) is expected to increase the LHC design luminosity by an order of magnitude. This will require silicon tracking detectors with a significantly higher radiation hardness. [...]
CMS-NOTE-2017-003; CERN-CMS-NOTE-2017-003.- Geneva : CERN, 2016 - 18 p. Fulltext: PDF;

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2017-05-09
10:50
Test Beam Performance Measurements for the Phase I Upgrade of the CMS Pixel Detector / Dragicevic, M. (Vienna, OAW) ; Friedl, M. (Vienna, OAW) ; Hrubec, J. (Vienna, OAW) ; Steininger, H. (Vienna, OAW) ; Gädda, A. (Helsinki Inst. of Phys.) ; Härkönen, J. (Helsinki Inst. of Phys.) ; Lampén, T. (Helsinki Inst. of Phys.) ; Luukka, P. (Helsinki Inst. of Phys.) ; Peltola, T. (Helsinki Inst. of Phys.) ; Tuominen, E. (Helsinki Inst. of Phys.) et al.
A new pixel detector for the CMS experiment is being built, owing to the instantaneous luminosities anticipated for the Phase I Upgrade of the LHC. The new CMS pixel detector provides four-hit tracking while featuring a reduced material budget as well as new cooling and powering schemes. [...]
CMS-NOTE-2017-002; arXiv:1706.00222; CERN-CMS-NOTE-2017-002.- Geneva : CERN, 2016 - 19 p. - Published in : JINST 12 (2017) P05022 Fulltext: PDF;

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2017-01-24
10:03
Simplified likelihood for the re-interpretation of public CMS results / The CMS Collaboration /CMS Collaboration
In this note, a procedure for the construction of simplified likelihoods for the re-interpretation of the results of CMS searches for new physics is presented. The procedure relies on the use of a reduced set of information on the background models used in these searches which can readily be provided by the CMS collaboration. [...]
CMS-NOTE-2017-001; CERN-CMS-NOTE-2017-001.- Geneva : CERN, 2017 - 26 p. Fulltext: PDF;

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2016-11-17
10:14
Upgrades for the Precision Proton Spectrometer at the LHC: Fast Timing and Tracking Detectors / Gallinaro, Michele (LIP, Lisbon) /CMS and TOTEM Collaborations
The CMS-TOTEM Precision Proton Spectrometer (CT-PPS) is an approved project to add tracking and timing information at approximately $\pm$210~m from the interaction point around the CMS detector. It is designed to operate at high luminosity with up to 50 interactions per 25~ns bunch crossing to perform measurements of e.g. [...]
CMS-NOTE-2016-002; CERN-CMS-NOTE-2016-002.- Geneva : CERN, 2016 - 5 p. Fulltext: PDF;

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2016-03-08
10:21
The pxarCore Library - Technical Documentation, Reference Manual, and Sample Applications / Spannagel, Simon (DESY) ; Meier, Beat (PSI, Villigen) ; Perrey, Hanno Christopher (DESY)
This document describes the pxarCore library as of version 2.7, a versatile cross-platform library to program and read out devices featuring PSI46-type readout chips (ROCs) via the PSI digital test beoard (DTB). The design principles and features are presented together with an overview over possible configurations and use cases. [...]
CMS-NOTE-2016-001; CERN-CMS-NOTE-2016-001.- Geneva : CERN, 2015 - 91 p. Fulltext: PDF;

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2015-08-12
16:55
The CMS/TOTEM nominal FLUKA Model; version 1.0.0.0 / Guthoff, Moritz (CERN) ; Kurochkin, Igor (Serpukhov, IHEP) ; Mallows, Sophie (Karlsruhe U., EKP) ; Ravotti, Federico (INFN, Turin) ; Urscheler, Christina (Zurich, ETH)
For a physics experiment such as CMS the understanding of the radiation environment is of great interest. It is necessary for the evaluation of the detector performance, effectiveness of shielding or to assess radiation damage. [...]
CMS-NOTE-2015-004; CERN-CMS-NOTE-2015-004.- Geneva : CERN, 2015 - 12 p. Fulltext: PDF;

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2015-08-12
16:55
ATLAS+CMS Boosted topologies (Run1 results, Run2 potential) / Stupak, John (Purdue U., Calumet)
As no sign of beyond the Standard Model (BSM) physics has yet been observed at the LHC, experimental searches continue to probe ever higher mass scales. The decay of new, heavy resonances can produce highly Lorentz boosted particles, such as top quarks and Higgs or vector bosons. [...]
CMS-NOTE-2015-005; CERN-CMS-NOTE-2015-005.- Geneva : CERN, 2015 - 9 p. Fulltext: PDF;

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