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2019-10-16
14:27
arXiv [PUBDB-2019-03693] Report/Journal Article
et al
Measurement of the top quark polarization and $\mathrm{t\bar{t}}$ spin correlations using dilepton final states in proton-proton collisions at $\sqrt{s}=$ 13 TeV
[arXiv:1907.03729; CMS-TOP-18-006; CERN-EP-2019-073]
Measurements of the top quark polarization and top quark pair (t¯t) spin correlations are presented using events containing two oppositely charged leptons (e+e−, e±μ∓, or μ+μ−) produced in proton-proton collisions at a center-of-mass energy of 13 TeV. The data were recorded by the CMS experiment at the LHC in 2016 and correspond to an integrated luminosity of 35.9  fb−1. [...]
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2019-10-16
14:17
arXiv [PUBDB-2019-03692] Preprint/Report
et al
Running of the top quark mass from proton-proton collisions at $\sqrt{s} =$ 13 TeV
[arXiv:1909.09193; CMS-TOP-19-007; CERN-EP-2019-189]
The running of the top quark mass is experimentally investigated for the first time. The mass of the top quark in the modified minimal subtraction ($\mathrm{\overline{MS}}$) renormalization scheme is extracted from a comparison of the differential top quark-antiquark ($\mathrm{t\overline{t}}$) cross section as a function of the invariant mass of the $\mathrm{t\overline{t}}$ system to next-to-leading-order theoretical predictions. [...]
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2019-10-15
14:57
[PUBDB-2019-03677] Dissertation / PhD Thesis

Precision measurement of thetop quark pair production cross sectionat√s = 13 TeV with the CMS detector
1 - 138 () = Dissertation, Hamburg University, 2018
This work presents several measurements of the inclusive top pair production cross sectionat a center of mass energy of√s = 13 TeV with the CMS detector. The cross section ismeasured using several data sets collected by the CMS detector in 2015 and 2016. [...]
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2019-10-15
11:03
arXiv [PUBDB-2019-03675] Report/Contribution to a conference proceedings

Deep learning detection of transients (ICRC-2019)DESY
[DESY-19-026; arXiv:1908.01615]
36th International Cosmic Ray Conference, ICRC2019, MadisonMadison, USA, 24 Jul 2019 - 1 Aug 20192019-07-242019-08-01 8 pages ()
The next generation of observatories will facilitate the discovery of new types of astrophysical transients. The detection of such phenomena, whose characteristics are presently poorly constrained, will hinge on the ability to perform blind searches. [...]
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2019-10-14
16:25
[PUBDB-2019-03673] Contribution to a conference proceedings
et al
Absorbed Radiation Doses on the European XFEL Undulator Systems During Early User Experiments
39th International Free Electron Laser Conference, FEL19, HamburgHamburg, Germany, 26 Aug 2019 - 30 Aug 20192019-08-262019-08-30 5 pp. ()
The European XFEL GmbH (EuXFEL) is a FEL userfacility based on a superconducting accelerator with highduty cycle. Three movable gap SASE Undulator Systems using hybrid NdFeB permanent magnet segments are in operation. [...]
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2019-10-14
16:19
[PUBDB-2019-03672] Contribution to a conference proceedings
et al
Multi-Beamline Operation at the European XFEL
39th International Free Electron Laser Conference, FEL19, HamburgHamburg, Germany, 26 Aug 2019 - 30 Aug 20192019-08-262019-08-30 JACoW Publishing, Geneva, Switzerland 4 pp. ()
The European XFEL uses a unique beam distribution scheme to direct electron bunches to its three undulator lines.The accelerator delivers up to 600 microsecond long bunchtrains, out of which parts or individual bunches can be selectedfor photon production in any of the FELs. This contribution gives a brief overview of the kicker-septum scheme facilitating this and highlights how even complex bunch patterns can easily be configured via the timing system..
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2019-10-14
12:05
[PUBDB-2019-03667] Journal Article
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Effect of precipitation in the compressive behavior of high strength Mg-Gd-Y-Zn extruded alloy
The influence of β′ and γ' precipitates on prismatic and basal planes and long-period stacking ordered (LPSO) fibers on the compressive behavior of high strength Mg-Gd-Y-Zn alloy was investigated using the combination of in-situ synchrotron radiation diffraction and acoustic emission, as well as transmission electron microscopy. After extrusion, the microstructure is characterized by highly oriented LPSO fibers elongated along the extrusion direction within the magnesium matrix. [...]
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2019-10-11
17:19
[PUBDB-2019-03663] Contribution to a conference proceedings
et al
Identification and Mitigation of Smoke-Ring Effects in Scintillator-Based Electron Beam Images at the European XFEL
39th International Free Electron Laser Conference, FEL19, HamburgHamburg, Germany, 26 Aug 2019 - 30 Aug 20192019-08-262019-08-30 JACoW Publishing, Geneva, Switzerland 6 pp. ()
Standard transverse beam profile measurements at the European XFEL are based on scintillating screen monitors using LYSO:Ce as scintillator material. While it is possible to resolve beam sizes down to a few micrometers with this material, the experience during the XFEL commissioning showed that the measured emittance values were significantly larger than the expected ones. [...]
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2019-10-11
17:13
[PUBDB-2019-03662] Contribution to a conference proceedings
et al
Status of the PETRA IV project
10th International Particle Accelerator Conference, IPAC'19, MelbourneMelbourne, Australia, 19 May 2019 - 24 May 20192019-05-192019-05-24 JACoW Publishing, Geneva, Switzerland 1404-1407 () [10.18429/JACOW-IPAC2019-TUPGW011]  GO
Since 2016 DESY has been pursuing R towards upgrading its PETRA synchrotron light source to a fourth-generation machine, PETRA IV, which is expected to start operation in 2027. The conceptual design of a 6 GeV seven-bend-achromat-based lattice with an approx. [...]
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2019-10-11
16:22
[PUBDB-2019-03661] Contribution to a conference proceedings
et al
Overview of the ARES Bunch Compressor at SINBAD
10th International Particle Accelerator Conference, IPAC'19, MelbourneMelbourne, Australia, 19 May 2019 - 24 May 20192019-05-192019-05-24 JACoW Publishing, Geneva, Switzerland 902-905 () [10.18429/JACOW-IPAC2019-MOPTS025]  GO
Bunch compressors are essential for the generation of short bunches with applications in e.g. colliders, free electron lasers, and advanced accelerator concepts. [...]
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