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CERN Preprints

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2014-11-21
22:07
Search for disappearing tracks in proton-proton collisions at $\sqrt{s} = 8~\mathrm{TeV}$
A search is presented for long-lived charged particles that decay within the CMS detector and produce the signature of a disappearing track. [...]
CERN-PH-EP-2014-273 ; CMS-EXO-12-034-003.
- 2014.
Additional information for the analysis - CMS AuthorList - Fulltext

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2014-11-21
09:00
The CMS Level-1 Tau algorithm for the LHC Run II / Mastrolorenzo, Luca (Ecole Polytechnique) /CMS Collaboration
The CMS experiment implements a sophisticated two-level online selection system that achieves a rejection factor of nearly 10e5. The first level (L1) is based on coarse information coming from the calorimeters and the muon detectors while the High Level Trigger combines fine-grain information from all sub-detectors. [...]
CMS-CR-2014-309.- Geneva : CERN, 2014 - 4 p. Fulltext: PDF;
In : 37th International Conference on High Energy Physics, Valencia, Spain, 2 - 9 Jul 2014

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2014-11-21
08:58
Review of BSM neutral Higgs results in CMS / Zucchetta, Alberto (INFN, Padua ; Padua U.) /CMS Collaboration
Searches for beyond the standard model neutral Higgs bosons at the CMS experiment are presented. The analyses are based on proton-proton collision data recorded by the CMS experiment at $\sqrt{s}=7$ TeV and $\sqrt{s}=8$ TeV center-of-mass energy in 2011 and 2012, corresponding to integrated luminosities of up to $4.9 fb^{-1}$ and $19.7 fb^{-1}$. [...]
CMS-CR-2014-403.- Geneva : CERN, 2014 - 12 p. Fulltext: PDF;
In : Prospects for Charged Higgs Discovery at Colliders (CHARGED 2014), Uppsala, Sweden, 16 - 18 Sep 2014

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2014-11-21
08:58
R and D on Radiation Hard Active Media Based on Quartz Plates / Onel, Yasar (Iowa U.) /CMS Collaboration
The need for radiation-hard active media in particle detectors is prominently dictated by the future colliders and the future operations of the Large Hadron Collider. The areas of implementation range from calorimetry to beamline instrumentation to specialized forward detectors e.g. [...]
CMS-CR-2014-402.- Geneva : CERN, 2014 - 5 p. Fulltext: PDF;
In : Conference Information and Promotion Committee (CIP) for the IEEE – Nuclear Science Symposium and Medical Imaging Conference, and Room-Temperature Semiconductor X-Ray and Gamma-Ray Detectors workshop (IEEE NSS-MIC), Seattle, WA, USA, 8 - 15 Nov 2014

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2014-11-21
08:58
Results (and future prospects) of the CMS experiment in photon-induced collisions in heavy-ion collisions / Kenny, Raymond Patrick (Kansas U.) /CMS Collaboration
Ultra-peripheral collisions (UPCs) of heavy ions involve long range electromagnetic interactions at impact parameters larger than twice the nuclear radius. At TeV energies, the strong electromagnetic field due to the coherent action of the Z=82 proton charges generates a large flux of photons, which can be used for high-energy photoproduction studies. [...]
CMS-CR-2014-398.- Geneva : CERN, 2014 - 5 p. Fulltext: PDF;
In : DIFFRACTION 2014 - International Workshop on Diffraction in High-Energy Physics, Primosten, Croatia, 10 - 16 Sep 2014

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2014-11-21
08:57
CMS results on exclusive and diffractive production / Alves, Gilvan Augusto (Rio de Janeiro, CBPF) /CMS Collaboration
We present recent CMS measurements of diffractive and exclusive processes, using data collected at 7 TeV at theLHC. Measurements of soft single- and double-diffractive cross sections are presented, as well as measurements of photoninducedprocesses including studies of exclusive WW production via photon-photon exchange
CMS-CR-2014-396.- Geneva : CERN, 2014 - 5 p. Fulltext: PDF;
In : DIFFRACTION 2014 - International Workshop on Diffraction in High-Energy Physics, Primosten, Croatia, 10 - 16 Sep 2014

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2014-11-21
08:52
Near Future Upgrades for the CMS Pixel Detector / Kumar, Ashish (SUNY, Buffalo) /CMS Collaboration
The silicon pixel detector is the innermost component of the CMS tracking system, providing high precision space point measurements of charged particle trajectories. The current pixel detector is designed to operate at a maximum luminosity of $1\times10^{34}cm^{-2}s^{-1}$. [...]
CMS-CR-2014-389.- Geneva : CERN, 2014 - 9 p. Fulltext: PDF;
In : Pixel 2014 7th International Workshop on Semiconductor Pixel Detectors for Particles and Imaging, Niagara Falls, Ontario, Canada, 1 - 5 Sep 2014

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2014-11-21
08:47
Identification of hadronic tau decays in CMS / Venditti, Rosamaria (INFN, Bari ; Bari U.) /CMS Collaboration
The algorithm used for reconstruction and identification of hadronic tau decays by the CMS experiment at the LHC is presented. The tau reconstruction in CMS takes advantage of the particle-flow algorithm which allows to reconstruct individual hadronic decay modes. The performance of the algorithm in terms of tau identification efficiency and rates for jets to be misidentified as hadronic tau decays is measured in $pp$ collision data recorded in 2012 at a center-of-mass energy of $8$~TeV, corresponding to an integrated luminosity of $19.7$~fb$^{-1}$..
CMS-CR-2014-392.- Geneva : CERN, 2014 - 8 p. Fulltext: PDF;
In : 3rd International Conference on New Frontiers in Physics, Kolymbari, Crete, Greece, 28 Jul - 06 Aug 2014

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2014-11-20
19:29
Measurement of the cross section ratio $\sigma_\mathrm{ t \bar{t} b \bar{b}} / \sigma_\mathrm{ t \bar{t} jj }$ in $\mathrm{pp}$ collisions at $\sqrt{s} = 8~\mathrm{TeV}$
The first measurement of the cross section ratio $\sigma_\mathrm{ t \bar{t} b \bar{b}} / \sigma_\mathrm{ t \bar{t} jj }$ is presented using a data sample corresponding to an integrated luminosity of $19.6~\mathrm{fb^{-1} }$ collected in $\mathrm{pp}$ collisions at $\sqrt{s} = 8~\mathrm{TeV}$ with the CMS detector at the LHC. [...]
CERN-PH-EP-2014-249 ; CMS-TOP-13-010-003.
- 2014.
Additional information for the analysis - CMS AuthorList - Fulltext

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2014-11-20
18:02
Frequency-Domain Maximum-Likelihood Estimation of High-Voltage Pulse Transformer Model Parameters / Aguglia, D (CERN)
This paper presents an offline frequency-domain nonlinear and stochastic identification method for equivalent model parameter estimation of high-voltage pulse transformers. [...]
CERN-OPEN-2014-053.
- 2014. - 10 p.
Article

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