20190319 11:12 
[PUBDB201901605]
Report/Journal Article
Babounikau, I. ; Osland, P. ; Pankov, A. A.
Improved constraints on the mixing and mass of $Z'$ bosons from resonant diboson searches at the LHC at $\sqrt{s}=13$ TeV and predictions for Run II
[DESY18170; arXiv:1809.08933]
New neutral vector bosons Z′ decaying to charged gauge boson pairs W$^+$W$^$ are predicted in many scenarios of new physics, including models with an extended gauge sector such as E6, leftright symmetric ZLRS′ and the sequential standard model ZSSM′. For these benchmark models we calculate and present theoretical expectations for different values of the Z′ mass M2 and mixing parameter ξ. [...]
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ddc:530
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20190319 10:24 
[PUBDB201901603]
Journal Article
Hanna, A. M. ; Vendrell, O. ; Santra, R.
Timeresolved xray/optical pumpprobe simulations on $\mathrm{N_2}$ molecules
The dynamics of $N_2^{2+}$ dications after xrayinduced Auger decay and their probing with a delayed infrared probe pulse are theoretically investigated based on a quantummechanical model including all relevant electronic states for which wavepacket calculations on abinitio potential energy curves are performed. Our results demonstrate that the $N_2^{2+}$ yield modulated by the delay of the probe pulse contains dynamical information on the wavepacket evolution in the quasibound final electronic states [...]
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ddc:500
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20190319 10:07 
[PUBDB201901602]
Dissertation / PhD Thesis
Shi, L. ; Baboi, N.I. ; Jones, R. M.
HigherOrderModebased Beam Phase and Beam Position Measurements in Superconducting Accelerating Cavities at the European XFEL
Instrumentation of higher order modes (HOMs) excited in accelerating cavities for beam phase and position inference provides a noninvasive and economical beam diagnostic. The principles and techniques for this purpose are investigated for TESLA (TeV Energy Superconducting Linear Accelerator) cavities at the injector part of the newly built European XFEL and at FLASH, two free electron laser facilities based on the TESLA technology.I have designed and instrumented unconventional beam phase monitors based on monopole modes in TESLA cavities and demonstrated a routine resolution of 0.1° with a broadband setup [...]
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20190318 11:32 
[PUBDB201901570]
Report/Journal Article
Phan, K. H. ; Riemann, T.
Scalar 1loop Feynman integrals as meromorphic functions in spacetime dimension d
[DESY 17079, HCMUS1901, KW 18004, arXiv:1812.10975]
The longstanding problem of representing the general massive oneloop Feynman integral as a meromorphic function of the spacetime dimension d has been solved for the basis of scalar one to fourpoint functions with indices one. In 2003 the solution of difference equations in the spacetime dimension allowed to determine the necessary classes of special functions: selfenergies need ordinary logarithms and Gauss hypergeometric functions $_{2}F_1$, vertices need additionally Kampé de FérietAppell functions $F_1$, and box integrals also LauricellaSaran functions $F_S$ [...]
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ddc:530
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20190315 10:39 
[PUBDB201901556]
Dissertation / PhD Thesis
Lishilin, O. ; Gross, M. ; Gruener, F.
Study of selfmodulation of an electron beam in plasma
The acceleration of electron beams in plasma wakefields driven by charged particlebeams is among the most promising candidates for future TeVscale compact electronaccelerators. Currently available high energy proton beams that could serve as driverbeams in a plasma wakefeld accelerator (PWFA) are much longer than what is requiredfor efficient excitation of highamplitude wakefields and thus for generating the desiredhigh acceleration gradients. [...]
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20190314 15:57 
[PUBDB201901551]
Preprint/Report
Blümlein, J. ; Maier, A. M. ; Marquard, P.
FiveLoop Static Contribution to the Gravitational Interaction Potential of Two Point Masses
[arXiv:1902.11180; DESY19029; DOTH19/01]
We compute the static contribution to the gravitational interaction potential of two point masses in the velocityindependent fiveloop (and 5th postNewtonian) approximation to the harmonic coordinates effective action in a direct calculation. The computation is performed using effective field methods based on Feynman diagrams in momentumspace in $d = 3  2\varepsilon$ space dimensions. [...]
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20190314 15:55 
[PUBDB201901550]
Preprint/Report
Andersen, J. R. ; Hapola, T. ; Heil, M. ; et al
HEJ 2: High Energy Resummation for Hadron Colliders
[arXiv:1902.08430; DESY19028; IPPP/19/13; MCnet1905]
We present HEJ 2, a new implementation of the High Energy Jets formalism for highenergy resummation in hadroncollider processes as a flexible Monte Carlo event generator. In combination with a conventional fixedorder event generator, HEJ 2 can be used to obtain greatly improved predictions for a number of phenomenologically important processes by adding allorder logarithmic corrections in $\hat{s}/p_\perp^2$. [...]
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20190314 15:26 
[PUBDB201901546]
Preprint/Report
Caselle, M. ; Nada, A. ; Panero, M. ; et al
Conformal field theory and the hot phase of threedimensional U(1) gauge theory
[arXiv:1903.00491; DESY19027]
We study the hightemperature phase of compact U(1) gauge theory in 2+1 dimensions, comparing the results of lattice calculations with analytical predictions from the conformalfieldtheory description of the lowtemperature phase of the bidimensional XY model. We focus on the twopoint correlation functions of probe charges and the fieldstrength operator, finding excellent quantitative agreement with the functional form and the continuously varying critical indices predicted by conformal field theory..
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20190314 11:38 
[PUBDB201901537]
Report/Journal Article
Blümlein, J. ; De Freitas, A. ; Raab, C. G. ; et al
The $O(\alpha^2)$ Initial State QED Corrections to $e^+e^$ Annihilation to a Neutral Vector Boson Revisited
[arXiv:1901.08018; DESY18226; DOTH1830]
We calculate the nonsinglet, the pure singlet contribution, and their interference term, at $O(\alpha^2)$ due to electronpair initial state radiation to $e^+ e^$ annihilation into a neutral vector boson in a direct analytic computation without any approximation. The correction is represented in terms of iterated incomplete elliptic integrals. [...]
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ddc:530
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20190314 11:25 
[PUBDB201901536]
Journal Article
Aartsen, M. G. ; Ackermann, M. ; Adams, J. ; et al
Measurement of atmospheric tau neutrino appearance with IceCube DeepCore
We present a measurement of atmospheric tau neutrino appearance from oscillations with three years of data from the DeepCore subarray of the IceCube Neutrino Observatory. This analysis uses atmospheric neutrinos from the full sky with reconstructed energies between 5.6 and 56 GeV to search for a statistical excess of cascadelike neutrino events which are the signature of $ν_τ$ interactions [...]
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