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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
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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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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ddc:530
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2018-07-12
15:17
OpenAccess [PUBDB-2018-02588] Report/Journal Article
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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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ddc:530
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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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2018-07-11
17:56
OpenAccess [PUBDB-2018-02583] Conference Presentation
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PolariX TDS - Applications at DESY
High Gradient Workshop 2018, HG2018, SINAPShanghai, SINAP, China, 4 Jun 2018 - 8 Jun 20182018-06-042018-06-08  GO
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2018-07-09
10:57
OpenAccess [PUBDB-2018-02550] Report/Internal Report

Investigation on Movements of the Photon Beam in the PETRA Beamline P03 -Untersuchungen der Strahllage des Photonen-Strahls in der PETRA Beamline P03
[DESY-M-18-02]
12 pp. () [10.3204/PUBDB-2018-02550]  GO
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2018-07-09
10:47
OpenAccess [PUBDB-2018-02549] Report/Internal Report
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TLD Evaluation for the XFEL Main Linac in 2017 -TLD Auswertung 2017 für den XFEL Main Linac
[DESY-M-18-01]
53 pp. () [10.3204/PUBDB-2018-02549]  GO
Thermoluminoscense dosimeters (TLD) are installed at several positions along the XFEL main linac tunnel inside the concrete shielding of the electronics racks. They have been readout regularly in every longer shutdown. [...]
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2018-07-05
02:27
OpenAccess [PUBDB-2018-02527] Conference Presentation (After Call)

The fate of Little Higgs Models with LHC Run 2 Data
International Conference on High Energy Physics 2018, ICHEP 2018, SeoulSeoul, South Korea, 4 Jul 2018 - 11 Jul 20182018-07-042018-07-11  GO
Little Higgs models - which can most easily be thought of as a variant ofcomposite Higgs models - explain a light Higgs boson at 125 GeV as anpseudo-Nambu-Goldstone boson of a spontaneously broken global symmetry.The mechanism of collective symmetry breaking shifts the UV scale ofthese models to the 10 TeV scale and higher. T-parity is introduced asa discrete symmetry to remove tree-level constraints on the electroweakprecision data. [...]
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