20190322 09:15 
[PUBDB201901665]
Report/Journal Article
Kramer, G. ; Spiesberger, H.
$b$hadron production in the generalmass variableflavornumber scheme and the LHC data
[arXiv:1809.04297; DESY18154; MITP18085]
We study inclusive $b$hadron production in $pp$ collisions at the LHC at different centerofmass energies and compare with experimental data from the LHCb and CMS collaborations. Our predictions for cross sections differential in the transverse momentum and (pseudo)rapidity agree with data within uncertainties due to renormalization scale variations [...]
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ddc:530
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20190320 08:43 
[PUBDB201901624]
Journal Article
Kaur, R. ; Welsch, R.
Probing photodissociation dynamics using ring polymer molecular dynamics
The performance of the ring polymer molecular dynamics (RPMD) approach to simulate typical photodissociation processes is assessed. The correct description of photodissociation requires the calculation of correlation functions or expectation values associated with nonequilibrium initial conditions, which was shown to be possible with RPMD very recently [J. [...]
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ddc:530
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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
[DESY17079; HCMUS1901; KW18004; 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 11:37 
[PUBDB201901557]
Journal Article
Janssens, K. ; Legrand, S. ; Van der Snickt, G. ; et al
Virtual Archaeology of Altered Paintings: Multiscale Chemical Imaging Tools
Understanding how painted works of art were constructed, layerbylayer, requires a range of macroscopic and microscopic Xray and infraredbased analytical methods. Deconstructing complex assemblies of paints horizontally across a picture and vertically through it provides insight into the detailed production process of the art work and on the painting techniques and styles of its maker. [...]
ddc:550
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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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