CERN Accelerating science

CERN Preprints

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2017-02-21
16:11
A General Method for Motion Compensation in X-ray Computed Tomography / Hancock, Steven (CERN) ; Biguri, Ander (University of Bath) ; Dosanjh, Manjit (CERN) ; Soleimani, Manuchehr (University of Bath)
Motion during data acquisition is a known source of error in medical tomography, resulting in blur artefacts in the regions that move. [...]
CERN-OPEN-2017-018.
- 2017. - 22 p.
Preprint

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2017-02-21
14:13
Observation of the suppressed decay $\Lambda^0_b \to p \pi^- \mu^+ \mu^-$
The suppressed decay $\Lambda^0_b \to p\pi^- \mu^+ \mu^-$ , excluding the $J/\psi$ and $\psi (2S) \to \mu^+ \mu^-$ resonances, is observed for the first time with a significance of $5.5$ standard deviations. [...]
CERN-EP-2016-312 ; LHCB-PAPER-2016-049.
- 2017.
Fulltext - Previous draft version - Related data file(s)

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2017-02-21
13:05
Performance of the ATLAS Transition Radiation Tracker in Run 1 of the LHC: tracker properties
The tracking performance parameters of the ATLAS Transition Radiation Tracker (TRT) as part of the ATLAS inner detector are described in this paper for different data-taking conditions in proton--proton, proton--lead and lead--lead collisions at the Large Hadron Collider (LHC). [...]
CERN-EP-2016-311.
- 2017.
Fulltext - Previous draft version

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2017-02-21
12:51
Measurements of the production cross section of a $Z$ boson in association with jets in pp collisions at $\sqrt{s} = 13$ TeV with the ATLAS detector
Measurements of the production cross section of a $Z$ boson in association with jets in proton-proton collisions at $\sqrt{s} = 13$ TeV are presented, using data corresponding to an integrated luminosity of 3.16 fb$^{-1}$ collected by the ATLAS experiment at the CERN Large Hadron Collider in 2015. [...]
CERN-EP-2016-297.
- 2017.
Fulltext - Previous draft version

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2017-02-21
06:46
Measurement of parameters of scintillating bars with wavelength-shifting fibres and silicon photomultiplier readout for the SHiP Muon Detector / Montanari, A (INFN, Bologna) ; Tosi, N (INFN, Bologna) ; Baldini, W (INFN, Ferrara) ; Calcaterra, A (Frascati) ; Lanfranchi, G (Frascati) ; Saputi, A (Frascati) ; Khotjantsev, A (Moscow, INR) ; Kudenko, Yu (Moscow, MIPT ; Moscow, INR ; Moscow Phys. Eng. Inst.) ; Kurochka, V (Moscow, INR) ; Mefodiev, A (Moscow, INR) et al.
The light yield and the time resolution of different types of 3 m long scintillating bars instrumented with wavelength shifting fibres and read out by different models of silicon photomultipliers have been measured at a test beam at the T9 area at the CERN Proton Synchrotron. [...]
arXiv:1612.01125.
- 2016. - 20 p.
00009 Light yield scan across 3 cm, 5 cm and 10 cm bars (a). Attenuation of scintillating light in the opposite directions from a fibre in the 10 cm bar (b). - 00006 Sum of the light yield measured at each as a function of the beam position along the bar for L2, L1, L4 bar. - 00004 L2 bar: light yield measured at each end (red squares and blue solid circles) and the sum of the light yields measured at both ends (black open circles) as a function of the incident beam position along the bar. - 00003 L1 bar: light yield measured at each end (red squares and blue solid circles) and the sum of the light yields at both ends (black open circles) as a function of the incident beam position along the bar. - 00007 Light yield scan for 3 cm bars U1 (a) and 5 cm bars U2 (b). - 00002 Example of distribution of the sum of the light yield collected at both ends of a 2 cm thick NICADD bar. - 00014 L2 bar time resolution using only SiPM $L$($R$), red circles(blue squares) and both SiPMs (green triangles). - 00013 L1 bar time resolution using only SiPM $L$($R$), red circles(blue squares) and both SiPMs (green triangles). - 00015 L4 bar time resolution using only SiPM $L$($R$), red circles(blue squares) and both SiPMs (green triangles). - 00001 Example of MPPC spectrum used for the calibration of the light yield. - 00008 Light yield scan for 10 cm bars U3 (a) and U4 (b). - 00000 Four types of bars manufactured at UNIPLAST factory. - 00018 Time resolution for 10 cm bars with 2 MPPC readout (a) and 4 MPPC readout (b). - 00017 Time resolution for 3 cm (a) and 5 cm bars (b) vs position along the bars. - 00011 Example of baseline-subtracted waveform for 2 cm thick NICADD bars. - 00010 The inefficiency for 3 and 5 cm wide bars as a function of the charge detection threshold. The events are counted if the charge is over the specified threshold at each bar end. - 00005 L4 bar: light yield measured at each end (red squares and blue solid circles) and the sum of the light yields measured at both ends (black open circles) as a function of the beam position along the bar. - 00016 Fitting of digitized pulse shape to obtain the timing mark. - 00012 Speed of light propagation $v_f$ in L2 fibre, for signals read by SiPM left (red line) and right (blue line); $v_f$ is measured as $(16.0\pm0.1)$ cm/ns. - Full text

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2017-02-20
22:57
Search for standard model production of four top quarks in proton-proton collisions at $ \sqrt{s} = $ 13 TeV
A search for events containing four top quarks (${\mathrm{ t \bar{t} }\mathrm{ t \bar{t} }} $) is reported from proton-proton collisions recorded by the CMS experiment at $\sqrt{s} = $ 13 TeV and corresponding to an integrated luminosity of 2.6 fb$^{-1}$. [...]
CERN-EP-2017-023 ; CMS-TOP-16-016-003.
- 2017.
Additional information for the analysis - CMS AuthorList - Fulltext

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2017-02-16
16:54
Top physics at HL-LHC / Azzi, Patrizia (INFN, Padua) /ATLAS ,CMS and Top Collaborations
A summary of the prospects for top-quark physics at the High Luminosity LHC is given..
CMS-CR-2017-029.- Geneva : CERN, 2017 - 8 p. Fulltext: PDF;
In : 9th International Workshop on Top Quark Physics, Olomouc, Czech Republic, 19 - 29 Sep 2016

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2017-02-16
16:43
Performance of the CMS Event Builder / Andre, Jean-marc Olivier (Fermilab) ; Behrens, Ulf (DESY) ; Branson, James (UC, San Diego) ; Brummer, Philipp Maximilian (CERN) ; Chaze, Olivier (CERN) ; Cittolin, Sergio (UC, San Diego) ; Contescu, Cristian (Fermilab) ; Craigs, Benjamin Gordon (CERN) ; Darlea, Georgiana Lavinia (MIT) ; Deldicque, Christian (CERN) et al.
The data acquisition system (DAQ) of the CMS experiment at the CERN Large Hadron Collider (LHC) assembles events at a rate of 100 kHz. It transports event data at an aggregate throughput of ~100 GB/s to the high-level trigger (HLT) farm. [...]
CMS-CR-2017-034.- Geneva : CERN, 2017 - 9 p. Fulltext: PDF;
In : 22nd International Conference on Computing in High Energy and Nuclear Physics, CHEP 2016, San Francisco, Usa, 10 - 14 Oct 2016

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2017-02-16
16:35
STEAM Education and Communication with Art at ATLAS and CMS / Paolucci, Pierluigi (INFN, Naples) /ATLAS and CMS Collaborations
Recent developments in science education policy and practice suggest that successful learning in the 21st century requires the horizontal connectedness across areas of knowledge by linking the arts and humanities with science, technology, engineering and mathematics (STEM) subjects. The rapidly increasing STEAM movement calls for arts integration into science teaching and learning to help school students develop skills that are necessary to thrive in an innovation economy. [...]
CMS-CR-2016-229.- Geneva : CERN, 2016 - 12 p. Fulltext: PDF;
In : 4th Conference on Large Hadron Collider Physics 2016 (LHCP 2016), Lund, Sweden, 13 - 18 Jun 2016

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2017-02-16
07:58
Measurement of the $W^+W^-$ production cross section in $pp$ collisions at a centre-of-mass energy of $\sqrt{s}$ = 13 TeV with the ATLAS experiment / Aaboud, Morad (Oujda U.) ; Aad, Georges (Marseille, CPPM) ; Abbott, Brad (Oklahoma U.) ; Abdallah, Jalal (Texas U., Arlington) ; Abdinov, Ovsat (Baku, Inst. Phys.) ; Abeloos, Baptiste (Orsay, LAL) ; Aben, Rosemarie (FOM, Amsterdam) ; AbouZeid, Ossama (UC, Santa Cruz) ; Abraham, Nicola (Sussex U.) ; Abramowicz, Halina (Tel Aviv U.) et al.
The production of opposite-charge $W$-boson pairs in proton-proton collisions at $\sqrt{s}$ = 13 TeV is measured using data corresponding to 3.16 fb$^{-1}$ of integrated luminosity collected by the ATLAS detector at the CERN Large Hadron Collider in 2015. [...]
arXiv:1702.04519 ; CERN-EP-2016-267.
- 37 p.

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