Reports

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2018-02-16
13:41
OpenAccess [PUBDB-2018-01230] Report/Journal Article
; ; ; et al
N-jettiness subtractions for g g → H at subleading power
[DESY-17-128] ddc:530
N-jettiness subtractions provide a general approach for performing fully-differential next-to-next-to-leading order (NNLO) calculations. Since they are based on the physical resolution variable N-jettiness, $\mathcal{T}$N, subleading power corrections in $\tau=\mathcal{T}$N/Q, with Q a hard interaction scale, can also be systematically computed [...]
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2018-02-14
14:46
OpenAccess [PUBDB-2018-01180] Report/Contribution to a conference proceedings

High-Energy Neutrino Astronomy: where do we stand, where do we go?
[arXiv:1711.08266]
50 years Baksan Laboratory, Meeting locationBaksan, Russia, 22 Nov 2017 - 22 Nov 20172017-11-222017-11-22 20 pp. (2017) [10.3204/PUBDB-2018-01180]  GO
With the identification of a diffuse flux of astrophysical ('cosmic') neutrinos in the TeV-PeV energy range, IceCube has opened a new window to the Universe. However, the corresponding cosmic landscape is still uncharted: so far, the observed flux does not show any clear association with known source classes. [...]
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2018-02-12
16:05
OpenAccess [PUBDB-2018-01164] Report/Journal Article
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Computing the nucleon charge and axial radii directly at $\mathrm{Q^2=0}$ in lattice QCD
[arXiv:1711.11385; DESY-17-203] ddc:530
We describe a procedure for extracting momentum derivatives of nucleon matrix elements on the lattice directly at $Q^2=0$. This is based on the Rome method for computing momentum derivatives of quark propagators. [...]
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2018-02-12
08:27
OpenAccess [PUBDB-2018-01147] Report
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Electron and photon reconstruction and performance in ATLAS using a dynamical, topological cell clustering-based approach
[ATL-PHYS-PUB-2017-022]
This note presents the reconstruction of electrons and photons in ATLAS using a dynamic,topological cell clustering-based approach. This new technique allows for improved meas-urements of electron and photon energies, particularly in situations where an electron radiatesa bremsstrahlung photon, or a photon converts to an electron-positron pair. [...]
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2018-02-10
11:20
[PUBDB-2018-01146] Report/Journal Article
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An in situ investigation of the deformation mechanisms in a β-quenched Ti-5Al-5V-5Mo-3Cr alloy
[I-20150533 EC] ddc:600
The sequence of activation of deformation mechanisms in a near-β Ti-5Al-5Mo-5V-3Cr alloy quenched from the β-field is investigated as a function of strain during uniaxial compression at 0.001 s−1 up to ε = 0.041. Bulk in situ high energy synchrotron X-ray diffraction is applied to follow continuously the evolution of the microstructure of the alloy during deformation and is complemented with metallographic analysis. [...]
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2018-02-08
16:31
arXiv [PUBDB-2018-01142] Report/Journal Article
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On Radiation Emission from a Microbunched Beam with Wavefront Tilt and its Experimental Observation
[DESY-17-093; arXiv:1706.10185] ddc:530
In this paper we compare experimental observations and theory of radiation emission from a microbunched beam with microbunching wavefront tilt with respect to the direction of motion. The theory refers to the work [1], which predicts, in this case, exponential suppression of coherent radiation along the kicked direction. [...]
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2018-02-08
10:11
[PUBDB-2018-01125] Report
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Brilliant Beams Produced by the European XFEL
[APS DPB Annual Newsletter 2017]
9-11 (2017)
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2018-02-07
16:03
OpenAccess [PUBDB-2018-01119] Book/Report/Dissertation / PhD Thesis
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Stability and Performance Studies of the PITZ Photoelectron Gun
[DESY-THESIS-2018-003]
Hamburg : Verlag Deutsches-Elektronen Synchrotron, DESY-THESIS, 163 pp. (2018) [10.3204/PUBDB-2018-01119] = Dissertation, Universität Hamburg, 2017  GO
The invention of free electron lasers (FELs) opened new opportunities for the investigation of natural phenomena. However, the operation of a FEL requires high energy, high peak current electron beams with very small transverse emittance which causes extreme requirements for the corresponding electron sources. [...]
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2018-02-07
13:11
arXiv [PUBDB-2018-01108] Report/Journal Article
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Evidence of quasi-partonic higher-twist effects in deep inelastic scattering at HERA at moderate $Q^2$
[arXiv:1707.05992] ddc:530
The combined HERA data for the inclusive deep inelastic scattering (DIS) cross sections for the momentum transfer $Q^2 > 1$ GeV$^2$ are fitted within the Dokshitzer-Gribov-Lipatov-Altarelli-Parisi (DGLAP) framework at next-to-leading order (NLO) and next-to-next-to-leading order (NNLO) accuracy, complemented by a QCD-inspired parameterisation of twist 4 corrections. A modified form of the input parton density functions is also included, motivated by parton saturation mechanism at small Bjorken $x$ and at a low scale. [...]
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2018-02-07
11:31
arXiv [PUBDB-2018-01100] Report/Journal Article
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Combined Forward-Backward Asymmetry Measurements in Top-Antitop Quark Production at the Tevatron
[FERMILAB-PUB-17-379-E; arXiv:1709.04894] ddc:550
The CDF and D0 experiments at the Fermilab Tevatron have measured the asymmetry between yields of forward- and backward-produced top and antitop quarks based on their rapidity difference and the asymmetry between their decay leptons. These measurements use the full data sets collected in proton-antiproton collisions at a center-of-mass energy of $\sqrt s =1.96$ TeV. [...]
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