Publications database

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2017-08-15
09:47
OpenAccess [PUBDB-2017-09253] Book/Report/Dissertation / PhD Thesis
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Aspects of Six-Dimensional Flux Compactifications
[DESY-THESIS-2017-036]
Hamburg : Verlag Deutsches Elektronen-Synchrotron, DESY-THESIS, 141 pp. (2017) [10.3204/PUBDB-2017-09253] = Universität Hamburg, Diss., 2017  GO
In this thesis we investigate various aspects of ux compactications in six-dimensionalquantum eld theories. After introducing the internal geometries, i.e. [...]
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2017-08-11
13:51
OpenAccess [PUBDB-2017-09190] Book/Report/Dissertation / PhD Thesis
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Search for contact interactions and finite quark radius using combined $e^{\pm}p$ data at HERA
[DESY-THESIS-2017-035]
Hamburg : Verlag Deutsches Elektronen-Synchrotron, DESY-THESIS, 163 pp. (2017) [10.3204/PUBDB-2017-09190] = Universität Hamburg, Diss., 2017  GO
A combination is presented of all previously published deep inelastic neutral and charged current $e^{\pm}p$ scattering measurements at HERA for zero beam polarisation.The ZEUS and H1 collaborations have collected data at electron beam energy of $27.5$ GeV and proton beam energies of $920$, $820$, $575$ and $460$ GeV.The combined data correspond to an integrated luminosity of about $1$ fb$^{-1}$ and cover a kinematic range in the negative four-momentum-transfer squared from $Q^{2} = 0.045$ GeV$^{2}$ to $Q^{2} = 50000$ GeV$^{2}$ and in Bjorken $x$ from $x_{\rm Bj} = 6 \times 10^{-7}$ to $x_{\rm Bj} = 0.65$.The correlations of systematic uncertainties between different sets of data were taken into account, resulting in significantly improved precision.The combined $e^{\pm}p$ cross sections were used in a QCD analysis at next-to-leading order, providing a set of parton distribution functions, called ZCIPDF.The combined measurements were also used in an analysis beyond the Standard Model using a new approach, performing simultaneous fits on large sets of Monte Carlo replicas of parton distribution functions, PDFs, together with the parameters of "new physics" processes.A simplified approach to reduce the calculation time was developed and extensively tested.It allowed the calculation time to be reduced by about a factor of 50.The resulting $95\,\%$ C.L. upper limit on the effective quark radius is $0.43 \cdot 10^{-16}$ cm and the limits on the mass scales for different contact interaction scenarios extend up to $10$ TeV.The analyses have shown that taking into account the possible influence of processes beyond the Standard Model on the PDF parameters is necessary, since the limits that would be obtained using PDFs from QCD analysis within the Standard Model are too strong by about $10\,\%$.Studies of the surface quality of 28 Niobium superconducting radio frequency, SRF, cavities and development of a controllable cooling system for Niobium samples are also reported.The SRF cavities are the core of the accelerating technology for the future International Linear Collider, ILC; the reported studies are part of an ongoing research and development program..
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2017-08-09
11:51
OpenAccess [PUBDB-2017-08991] Book
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Einführung in Statistik und Messwertanalyse für Physiker : Ergänzungen
Hamburg : Verlag Deutsches Elektronen-Synchrotron, 66 pp. (2017) [10.3204/PUBDB-2017-08991]  GO
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2017-08-09
11:19
OpenAccess [PUBDB-2017-08987] Book
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Introduction to Statistics and Data Analysis for Physicists; 3rd revised
Hamburg : Verlag Deutsches Elektronen-Synchrotron, 488 pp. (2017) [10.3204/PUBDB-2017-08987]  GO
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2017-08-08
16:03
OpenAccess [PUBDB-2017-08954] Report/Journal Article
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Nuclear Physics Meets the Sources of the Ultra-High Energy Cosmic Rays
[arXiv:1607.07989] ddc:000
The determination of the injection composition of cosmic ray nuclei within astrophysical sources requires sufficiently accurate descriptions of the source physics and the propagation – apart from controlling astrophysical uncertainties. We therefore study the implications of nuclear data and models for cosmic ray astrophysics, which involves the photo-disintegration of nuclei up to iron in astrophysical environments. [...]
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2017-08-08
15:55
OpenAccess [PUBDB-2017-08952] Report/Journal Article
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High energy neutrinos from the tidal disruption of stars
[arXiv:1612.03160] ddc:530
We study the production of high energy neutrinos in jets from the tidal disruption of stars by supermassive black holes. The diffuse neutrino flux expected from these tidal disruption events (TDEs) is calculated both analytically and numerically, taking into account the dependence of the rate of TDEs on the redshift and black hole mass. [...]
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2017-08-08
15:49
arXiv [PUBDB-2017-08950] Report/Journal Article
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Combined fit of spectrum and composition data as measured by the Pierre Auger Observatory
[arXiv:1612.07155 , FERMILAB-PUB-16-618] ddc:530
We present a combined fit of a simple astrophysical model of UHECR sources to both the energy spectrum and mass composition data measured by the Pierre Auger Observatory. The fit has been performed for energies above 5⋅1018 eV, i.e.~the region of the all-particle spectrum above the so-called "ankle" feature. [...]
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2017-08-08
15:40
OpenAccess [PUBDB-2017-08947] Journal Article/Report/Contribution to a conference proceedings

Interactions of Cosmic Rays around the Universe. Models for UHECR data interpretation
[arXiv:1705.04077]
XLVI International Symposium on Multiparticle Dynamics, ISMD 2016, Meeting locationJeju Island, South Korea, 29 Aug 2016 - 2 Sep 20162016-08-292016-09-02
The European physical journal / Web of Conferences 141, 07001 - (2017) [10.1051/epjconf/201714107001]  GO
ddc:530
Ultra high energy cosmic rays (UHECRs) are expected to be accelerated inastrophysical sources and to travel through extragalactic space before hitting the Earth atmosphere.They interact both with the environment in the source and with the intergalacticphoton fields they encounter, causing different processes at various scales dependingon the photon energy in the nucleus rest frame. UHECR interactions are sensitive touncertainties in the extragalactic background spectrum and in the photo-disintegrationmodels..
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2017-08-08
15:30
[PUBDB-2017-08942] Contribution to a conference proceedings/Contribution to a book
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Ellipticity Dependence of Higher-order Harmonics in Solids: Unraveling the Coupled Intraband and Interband Dynamics
CLEO: Applications and Technology in Proceedings Conference on Lasers and Electro-Optics
Conference on Lasers and Electro-Optics, CLEO 2017, Meeting locationSan Jose, California, California, 14 May 2017 - 19 May 20172017-05-142017-05-19
Washington D.C. : OSA, JTh5B (2017) [10.1364/CLEO_AT.2017.JTh5B.10] special issue: "CLEO: QELS_Fundamental Science 2017"  GO
The various higher-harmonic orders generated in solids exhibit qualitatively different sensitivity to driver-pulse ellipticity, resulting from a different response of intraband and interbanddynamics. Non-zero driver-pulse ellipticity permits harmonic cutoff extension and circularly polarized higher-harmonics..
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2017-08-08
15:22
[PUBDB-2017-08938] Contribution to a conference proceedings/Contribution to a book
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Narrowband Terahertz Generation with Broadband Chirped Pulse Trains in Periodically Poled Lithium Niobate
CLEO: QELS_Fundamental Science in Proceedings Conference on Lasers and Electro-Optics
Conference on Lasers and Electro-Optics, CLEO 2017, Meeting locationSan Jose, California, USA, 14 May 2017 - 19 May 20172017-05-142017-05-19
Washington, D.C. : OSA, FW4D (2017) [10.1364/CLEO_QELS.2017.FW4D.4] special issue: "CLEO: QELS_Fundamental Science 2017"  GO
We generate narrowband terahertz radiation in periodically poled lithium niobate crystals using a train of chirped-and-delayed pulses from a broadband high energy Ti:sapphire laser. We achieve a multi-cycle THz energy of 40 mJ at 0.544 THz..
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