Publications database

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2018-07-17
11:58
OpenAccess [PUBDB-2018-02627] Contribution to a conference proceedings
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Attosecond Timing
60th ICFA Advanced Beam Dynamics Workshop on Future Light Sources, FLS 2018, ShanghaiShanghai, China, 5 Mar 2018 - 9 Mar 20182018-03-052018-03-09 JACoW Publishing, Geneva, Switzerland 79-84 () [10.18429/JACOW-FLS2018-WEA1PL03]  GO
Photon-science facilities such as X-ray free-electron lasers (XFELs) and intense-laser facilities are emerging world-wide with some of them producing sub-fs X-ray pulses. These facilities are in need of a high-precision timing distribution system, which can synchronize various microwave and optical sub-sources across multi-km distances with attosecond precision. [...]
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2018-07-17
10:27
DBCoverage [PUBDB-2018-02625] Report/Journal Article

Impedances of Anisotropic Round and Rectangular Chambers
[DESY-18-059; arXiv:1805.11263]
We consider the calculation of electromagnetic fields generated by a point charge passing through ananisotropic vacuum chamber of round or rectangular cross section with translational symmetry in the beamdirection. The anisotropy causes a frequency shift and can have a significant effect on modal coupling. [...]
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ddc:530
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2018-07-17
09:43
OpenAccess [PUBDB-2018-02624] Report/Internal Report

A Simple Automatic Radiation Alarm System for the XFEL Main LINACEin einfaches Strahlungsalarm-System für den XFEL Main Linac
[DESY-Technical-Note-18-01]
7 pp. () [10.3204/PUBDB-2018-02624]  GO
XFEL läuft schon seit einiger Zeit im Routinebetrieb. Jedoch sind noch Bemühungen im Gange, den Betrieb weiter zu optimieren, und insbesondere auch höhere Energien zu erreichen.Hierzu werden die Cavitiy-Spannungen sukzessiv erhöht, bis das sogenannte Quench-Limit erreicht wird. [...]
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2018-07-16
15:58
OpenAccess [PUBDB-2018-02623] Report/Journal Article
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Dijet production in diffractive deep-inelastic scattering in next-to-next-to-leading order QCD
[CERN-TH-2018-081,DESY-18-054, IPPP-18-26, ZU-TH-13-18]
Abstract (Springer)Hard processes in diffractive deep-inelastic scattering can be described by a factorisation into parton-level subprocesses and diffractive parton distributions. In this framework, cross sections for inclusive dijet production in diffractive deep-inelastic electron–proton scattering (DIS) are computed to next-to-next-to-leading order (NNLO) QCD accuracy and compared to a comprehensive selection of data. [...]
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ddc:530
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2018-07-13
09:12
arXiv [PUBDB-2018-02595] Preprint/Report
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Testing the event-chain algorithm in asymptotically free models
[DESY-18-090; arXiv:1806.11460]
We apply the event-chain algorithm proposed by Bernard, Krauth and Wilson in 2009 to toy models of lattice QCD. We give a formal prove of stability of the algorithm. [...]

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2018-07-12
15:59
arXiv [PUBDB-2018-02593] Report/Journal Article
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Study of $K_S^ 0$ pair production in single-tag two-photon collisions
[arXiv:1712.02145; Belle Preprint 2017-25, KEK Preprint 2017-36]
We report a measurement of the cross section for $K^0_S$ pair production in single-tag two-photon collisions, $\gamma^* \gamma \to K^0_S K^0_S$, for $Q^2$ up to 30 GeV$^2$, where $Q^2$ is the negative of the invariant mass squared of the tagged photon. The measurement covers the kinematic range 1.0 GeV < W < 2.6 GeV and $|\cos \theta^*| < 1.0$ for the total energy and kaon scattering angle, respectively, in the $\gamma^* \gamma$ center-of-mass system. [...]
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2018-07-12
15:36
OpenAccess [PUBDB-2018-02591] Report/Journal Article
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Observation of excited $\Omega_c$ charmed baryons in $e^ + e^ −$ collisions
[BELLE-PREPRINT-2017-22; KEK-PREPRINT-2017-32; arXiv:1711.07927]
Using the entire Belle data sample of 980 ${\rm fb}^{-1}$ of $e^+e^-$ collisions, we present the results of a study of excited $\Omega_c$ charmed baryons in the decay mode $\Xi_c^+K^-$. We show confirmation of four of the five narrow states reported by the LHCb Collaboration: the $\Omega_c(3000)$ , $\Omega_c(3050)$, $\Omega_c(3066)$, and $\Omega_c(3090)$..
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2018-07-12
15:17
OpenAccess [PUBDB-2018-02588] Report/Journal Article
; ; ; et al
Measurement of the $\tau$ Michel parameters $\bar{\eta}$ and $\xi\kappa$ in the radiative leptonic decay $\tau^- \rightarrow \ell^- \nu_{\tau} \bar{\nu}_{\ell}\gamma$
[arXiv:1709.08833; Belle preprint 2017-20, KEK preprint 2017-29]
We present a measurement of the Michel parameters of the $\tau$ lepton, $\bar{\eta}$ and $\xi\kappa$, in the radiative leptonic decay $\tau^- \rightarrow \ell^- \nu_{\tau} \bar{\nu}_{\ell} \gamma$ using 711~f$\mathrm{b}^{-1}$ of collision data collected with the Belle detector at the KEKB $e^+e^-$ collider. The Michel parameters are measured in an unbinned maximum likelihood fit to the kinematic distribution of $e^+e^-\rightarrow\tau^+\tau^-\rightarrow (\pi^+\pi^0 \bar{\nu}_\tau)(\ell^-\nu_{\tau}\bar{\nu}_{\ell}\gamma)$ $(\ell=e$ or $\mu)$. [...]
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2018-07-12
14:27
[PUBDB-2018-02586] Review/Journal Article
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Terahertzstrahlen dirigieren Elektronenpakete
Physik in unserer Zeit 49(4), 165 - 166 () [10.1002/piuz.201870406]  GO
Ultraschnelle Elektronenmikroskope und Röntgenstrahlungsquellen basieren auf beschleunigten und präzise geformten Elektronenpaketen. Unsere Gruppe am DESY konnte kürzlich zeigen, wie mit sehr hochfrequenter Strahlung im Terahertzbereich kompakte Bauelemente für die Elektronenbeschleunigung realisiert und mit leichter Abwandlung auch zur zeitlichen und räumlichen Pulsformung sowie Pulscharakterisierung verwendet werden können..
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2018-07-12
13:51
OpenAccess [PUBDB-2018-02585] Preprint/Report
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Search for supersymmetry in events with a $\tau$ lepton pair and missing transverse momentum in proton-proton collisions at $\sqrt{s}=$ 13 TeV
[CMS-SUS-17-003; CERN-EP-2018-149; arXiv:1807.02048]
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A search for the electroweak production of supersymmetric particles in proton-proton collisions at a center-of-mass energy of 13 TeV is presented in final states with a $\tau$ lepton pair. Both hadronic and leptonic decay modes are considered for the $\tau$ leptons. [...]
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