20190207 11:14 
[PUBDB201900973]
Preprint/Report
Varzielas, I. d. M. ; Talbert, J.
Simplified Models of Flavourful Leptoquarks
[DESY18210; arXiv:1901.10484]
We study the implications of single leptoquark extensions of the Standard Model (SM) under the assumption that their enhanced Yukawa sectors are invariant under global Abelian flavour symmetries already present in SM mass terms. Such symmetries, assumed to be the `residual' subgroups of an ultraviolet flavour theory, have previously been considered in order to predict fermionic mixing angles. [...]
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20190206 12:29 
[PUBDB201900961]
Preprint/Report
Bell, G. ; Rahn, R. ; Talbert, J.
Generic dijet soft functions at twoloop order: correlated emissions
[DESY18209; arXiv:1812.08690]
We present a systematic algorithm for the perturbative computation of soft functions that are defined in terms of two lightlike Wilson lines. Our method is based on a universal parametrisation of the phasespace integrals, which we use to isolate the singularities in Laplace space. [...]
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20190206 12:20 
[PUBDB201900960]
Report/Journal Article
Vidal, X. C. ; Mariotti, A. ; Redigolo, D. ; et al
New axion searches at flavor factories
[arXiv:1810.09452; DESY18183]
We assess the impact of searches at flavor factories for new neutral resonances that couple to both photons and gluons. These are well motivated by 'heavy axion' solutions of the strong CP problem and by frameworks addressing both Dark Matter and the Higgs hierarchy problem. [...]
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ddc:530
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20190206 12:17 
[PUBDB201900959]
Report/Journal Article
Abada, A. ; Arcadi, G. ; Domcke, V. ; et al
Lowscale leptogenesis with three heavy neutrinos
[arXiv:1810.12463; DESY18174; CP31859; LPTOrsay1885]
Leptogenesis induced by the oscillations of GeVscale neutrinos provides a minimal and testable explanation of the baryon asymmetry of the Universe. In this work we extend previous studies invoking only two heavy neutrinos to the case of three heavy neutrinos. [...]
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ddc:530
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20190206 12:14 
[PUBDB201900958]
Report/Journal Article
Buchmuller, W. ; Dierigl, M. ; Tatsuta, Y.
Magnetized orbifolds and localized flux
[DESY18167]
Magnetized orbifolds play an important role in compactifications of string theories and higherdimensional field theories to four dimensions. Magnetic flux leads to chiral fermions, it can be a source of supersymmetry breaking and it is an important ingredient of moduli stabilization. [...]
ddc:530
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20190206 12:10 
[PUBDB201900957]
Report/Journal Article
Athron, P. ; Balázs, C. ; Beniwal, A. ; et al
Global analyses of Higgs portal singlet dark matter models using GAMBIT 14346044
[CoEPPMN186; DESY18141; TTK1834; ADP1822T1070; arXiv:1808.10465]
We present global analyses of effective Higgs portal dark matter models in the frequentist and Bayesian statistical frameworks. Complementing earlier studies of the scalar Higgs portal, we use GAMBIT to determine the preferred mass and coupling ranges for models with vector, Majorana and Dirac fermion dark matter. [...]
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ddc:530
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20190206 12:05 
[PUBDB201900956]
Report/Journal Article
Bell, G. ; Hornig, A. ; Lee, C. ; et al
$\mathrm{e^+ e^−}$ angularity distributions at NNLL′ accuracy
[DESY18083; SIHEP201819; LAUR1824071; arXiv:1808.07867]
We present predictions for the $e^{+}e^{}$ event shape angularities at NNLL$^{\prime}$ resummed and $\mathcal{O}(\alpha_s^{2})$ matched accuracy and compare them to LEP data at centerofmass energies $Q=91.2$ GeV and $Q=197$ GeV. We perform the resummation within the framework of SoftCollinear Effective Theory, and make use of recent results for the twoloop angularity soft function. [...]
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20190206 10:35 
[PUBDB201900953]
Talk (nonconference) (Invited)
Stefaniak, T.
BSM Higgs Sectors at the LHC: tools, benchmarks and signatures
2019Theory Seminar, Bonn UniversityBonn, Bonn University, Germany, 31 Jan 2019  31 Jan 20192019013120190131
Given the experimental confirmation of the Standard Model (SM) predictions for the discovered Higgs boson as well as the nonobservation of signals for beyondtheStandard Model (BSM) physics in Run1 and Run2 of the Large Hadron Collider (LHC), I shall discuss the implications for BSM Higgs models and highlight possible new signatures and search strategies for future LHC runs. After introducing the public tools HiggsBounds and HiggsSignals  designed to confront BSM models with the experimental results  I will focus on the Minimal Supersymmetric Standard Model (MSSM) and present a new set of benchmark scenarios specificly designed for upcoming BSM Higgs searches at the LHC. [...]
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20190206 10:32 
[PUBDB201900952]
Talk (nonconference) (Invited)
Stefaniak, T.
BSM Higgs Sectors at the LHC: tools, benchmarks and signatures
2019Theory Seminar, Mainz UniversityMainz, Mainz University, Germany, 29 Jan 2019  29 Jan 20192019012920190129
Given the experimental confirmation of the Standard Model (SM) predictions for the discovered Higgs boson as well as the nonobservation of signals for beyondtheStandard Model (BSM) physics in Run1 and Run2 of the Large Hadron Collider (LHC), I shall discuss the implications for BSM Higgs models and highlight possible new signatures and search strategies for future LHC runs. After introducing the public tools HiggsBounds and HiggsSignals  designed to confront BSM models with the experimental results  I will focus on the Minimal Supersymmetric Standard Model (MSSM) and present a new set of benchmark scenarios specificly designed for upcoming BSM Higgs searches at the LHC. [...]
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20190206 09:57 
[PUBDB201900951]
Report/Journal Article
Espinosa, J. R. ; Konstandin, T.
A fresh look at the calculation of tunneling actions in multifield potentials
[arXiv:1811.09185; DESY18206; CERNTH2018245]
The quantum decay of a metastable vacuum is exponentially suppressed by a tunneling action that can be calculated in the semiclassical approximation as the Euclidean action of a bounce that interpolates between the false and true phases. For multifield potentials, finding the bounce is nontrivial due to its peculiar boundary conditions and the fact that the action at the bounce is not a minimum but merely a saddle point. [...]
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