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CMS Detector Performance Summaries

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2015-09-02
15:54
Multivariate Determination of the Missing Energy in the Transverse Plane ($E^{miss}_T$) at $\sqrt{s}= 13 \TeV$ /CMS Collaboration
The precise determination of the missing transverse momentum is crucial for all processes where undetectable particles are involved. In searches beyond the standard model, such as collider-based dark-matter searches or supersymmetry, the precise determination of the missing transverse momentum is a key component. For the standard model Higgs Boson discovery, MVA $E^{miss}_T$ played an importent role in analyses like $H \rightarrow \tau \tau$ with up to four neutrinos in the final state, where the mass resolution largely depends on the $E^{miss}_T$ resolution. This note presents the performance of the MVA $E^{miss}_T$ developed in Run 1 applied on first 13 TeV data..
CMS-DP-2015-042; CERN-CMS-DP-2015-042.- Geneva : CERN, 2015 - 7 p. Fulltext: PDF;

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2015-09-02
09:53
ECAL hit timing with Run1 and Run2 energy reconstruction in early 25ns data at 13 TeV /CMS Collaboration
In the following hit time distributions in the electromagnetic calorimeter barrel are presented for hits with measured energy larger than 1 GeV in collision data at \sqrt(s)=13 TeV and 25 ns bunch spacing. Hit time distributions are presented using two different methods for energy reconstruction: the "weights method" (default during Run 1) and the "multifit method" (developed for Run 2). With the weights method the energy deposits in bunch crossings (BX) different from the one firing the trigger contribute to the hit energy. [...]
CMS-DP-2015-040; CERN-CMS-DP-2015-040.- Geneva : CERN, 2015 - 8 p. Fulltext: PDF;

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2015-09-02
09:53
Event Display of a Candidate Electron-Positron Pair with an Invariant Mass of 2.9 TeV /CMS Collaboration
This performance note shows the event display together with some kinematic quantities for a candidate electron-positron pair with an invariant mass of 2.9 TeV. The background expected from the SM above m(ee) = 1 TeV, 2 TeV and 2.5 TeV for an integrated luminosity of 65 pb-1 is also stated..
CMS-DP-2015-039; CERN-CMS-DP-2015-039.- Geneva : CERN, 2015 - 11 p. Fulltext: PDF;

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2015-08-31
15:06
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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2015-08-31
15:06
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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2015-08-24
15:40
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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2015-08-19
11:44
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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2015-08-17
10:20
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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2015-08-10
15:47
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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2015-08-10
15:46
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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