CERN Accelerating science

CMS Detector Performance Summaries

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b-tagging in boosted topologies /CMS Collaboration
As the LHC explores a new energy regime, searches for physics beyond the Standard Model at high mass scale will probe objects produced with a momentum considerably higher than their mass, modifying in a very appreciable way the event topology. The decay products of boosted objects will be collimated into a smaller area such that they could be merged within a single \emph{fat} jet. [...]
CMS-DP-2015-038; CERN-CMS-DP-2015-038.- Geneva : CERN, 2015 - 16 p. Fulltext: PDF;

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First 48 pb$^{-1}$ of data at 13 TeV: a few selected plots from Exotica non-hadronic analyses /CMS Collaboration
This performance note shows a first look at the dielectron and dimuon invariant mass spectra and the transverse mass distribution for muon + E$_{\rm T}^{\rm miss}$ events at $\sqrt{s}$ = 13~TeV as observed by the CMS experiment at the LHC at CERN. The data corresponds to an integrated luminosity of up to 48 pb$^{-1}$ collected in July 2015 with the LHC bunch spacing of 50~ns. [...]
CMS-DP-2015-037; CERN-CMS-DP-2015-037.- Geneva : CERN, 2015 - 18 p. Fulltext: PDF;

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B2G variables validation with first 13TeV data /CMS Collaboration
This document contains a W' candidate event display and plots comparing data and MC for variables used in the $t\bar t$+DM search analysis. The dataset used corresponds to a luminosity of 41.9 pb$^{-1}$..
CMS-DP-2015-033; CERN-CMS-DP-2015-033.- Geneva : CERN, 2015 - 9 p. Fulltext: PDF;

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Performance of CMS Resistive Plate Chambers in CRAFT and early 2015 collisions at 13 TeV /CMS Collaboration
Resistive Plate Chambers (RPC) performance results with cosmics data at 3.8 T and p-p collision data at 13 TeV for 2015 are presented. These results include plots of relevant RPC variables such as occupancy, cluster size, efficiency and residuals. [...]
CMS-DP-2015-032; CERN-CMS-DP-2015-032.- Geneva : CERN, 2015 - 12 p. Fulltext: PDF;

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First Results from the Pixel Luminosity Telescope (PLT) /CMS Collaboration
The Pixel Luminosity Telescope (PLT) is a silicon pixel detector dedicated to luminosity measurement at CMS. After a successful pilot run in 2012, the full PLT system, consisting of 48 pixel sensors mounted in 16 telescopes, eight on each side of CMS, was installed during LS1. [...]
CMS-DP-2015-030; CERN-CMS-DP-2015-030.- Geneva : CERN, 2015 - 7 p. Fulltext: PDF;

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Alignment of the CMS Tracking-Detector with First 2015 Cosmic-Ray and Collision Data /CMS Collaboration
The performance of the CMS tracking-detector alignment with the first 2015 cosmic-ray data and proton-proton collision data at 13 TeV center-of-mass energy with the magnetic field at at 0 T and 3.8 T is presented..
CMS-DP-2015-029; CERN-CMS-DP-2015-029.- Geneva : CERN, 2015 - 42 p. Fulltext: PDF;

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Performance of the CMS Cathode Strip Chamber endcap muon detectors in Run 2 and first results with 2015 data /CMS Collaboration
The Cathode Strip Chambers (CSC's) are located in the CMS endcap and record muons in the region of absolute pseudorapidity between 0.9 and 2.4. The first performance results of the CSC's in Run 2 are shown..
CMS-DP-2015-027; CERN-CMS-DP-2015-027.- Geneva : CERN, 2015 - 6 p. Fulltext: PDF;

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Validation of the Mean-Timer algorithm for DT Local Reconstruction and muon time measurement, using 2012 data. /CMS Collaboration
The Mean-Timer algorithm is used for the local reconstruction within the CMS Drift Tubes (DT), for muons that appear to be out-of-time (OOT) or lack measured hits in one of the two space projections. Compared to standard linear fit, this method improves the spatial resoluton for OOT muons. [...]
CMS-DP-2015-026; CERN-CMS-DP-2015-026.- Geneva : CERN, 2015 - 7 p. Fulltext: PDF;

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Nuclear interaction study around beam pipe region in the Tracker system at CMS with 13 TeV data /CMS Collaboration
Analysis is presented to study the material in the Tracker system with nuclear interactions from proton-proton collisions recorded by the CMS experiment at the CERN LHC. The data correspond to an integrated luminosity of 7.3 pb$^{-1}$ at a centre-of-mass energy of 13 TeV collected at 3.8 Tesla magnetic field. [...]
CMS-DP-2015-024; CERN-CMS-DP-2015-024.- Geneva : CERN, 2015 - 2 p. Fulltext: PDF;

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First BHM performance plots /CMS Collaboration
A new detector to measure the machine induced background at large radii (1.8 m from beam axis) has been developed and installed in the CMS experiment at LHC. It consists of 40 modules, each comprising a quartz bar read out by a photomultiplier. [...]
CMS-DP-2015-023; CERN-CMS-DP-2015-023.- Geneva : CERN, 2015 - 5 p. Fulltext: PDF;

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