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2018-07-18
10:32
OpenAccess [PUBDB-2018-02633] Report/Journal Article
; ; ; et al
A non-perturbative exploration of the high energy regime in $N_{\mathrm{f}}=3$ QCD
[CERN-TH-2018-060, DESY 18-044, WUB/18-01, arXiv:1803.10230]
Using continuum extrapolated lattice data we trace a family of running couplings in three-flavour QCD over a large range of scales from about 4 to 128 GeV. The scale is set by the finite space time volume so that recursive finite size techniques can be applied, and Schrödinger functional (SF) boundary conditions enable direct simulations in the chiral limit. [...]
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2018-07-18
10:17
OpenAccess [PUBDB-2018-02631] Journal Article
; ; ; et al
Fermi -LAT Observations of LIGO/Virgo Event GW170817
We present the Fermi Large Area Telescope (LAT) observations of the binary neutron star merger event GW170817 and the associated short gamma-ray burst (SGRB) GRB 170817A detected by the Fermi Gamma-ray Burst Monitor. The LAT was entering the South Atlantic Anomaly at the time of the LIGO/Virgo trigger ($t_{GW}$) and therefore cannot place constraints on the existence of high-energy (E > 100 MeV) emission associated with the moment of binary coalescence. [...]
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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
; ; ; et al
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
; ; ; et al
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
13:51
OpenAccess [PUBDB-2018-02585] Preprint/Report
; ; ; et al
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]
 GO
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
; ; ; et al
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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