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2019-02-07
11:14
OpenAccess [PUBDB-2019-00973] Preprint/Report

Simplified Models of Flavourful Leptoquarks
[DESY-18-210; arXiv:1901.10484]
 GO
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 ultra-violet flavour theory, have previously been considered in order to predict fermionic mixing angles. [...]
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2019-02-06
12:29
OpenAccess [PUBDB-2019-00961] Preprint/Report

Generic dijet soft functions at two-loop order: correlated emissions
[DESY-18-209; arXiv:1812.08690]
 GO
We present a systematic algorithm for the perturbative computation of soft functions that are defined in terms of two light-like Wilson lines. Our method is based on a universal parametrisation of the phase-space integrals, which we use to isolate the singularities in Laplace space. [...]
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2019-02-06
12:20
OpenAccess [PUBDB-2019-00960] Report/Journal Article
et al
New axion searches at flavor factories
[arXiv:1810.09452; DESY-18-183]
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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2019-02-06
12:17
OpenAccess [PUBDB-2019-00959] Report/Journal Article
et al
Low-scale leptogenesis with three heavy neutrinos
[arXiv:1810.12463; DESY-18-174; CP3-18-59; LPT-Orsay-18-85]
Leptogenesis induced by the oscillations of GeV-scale 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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2019-02-06
12:14
[PUBDB-2019-00958] Report/Journal Article

Magnetized orbifolds and localized flux
[DESY-18-167]
Magnetized orbifolds play an important role in compactifications of string theories and higher-dimensional 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. [...]
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2019-02-06
12:10
OpenAccess [PUBDB-2019-00957] Report/Journal Article
et al
Global analyses of Higgs portal singlet dark matter models using GAMBIT 1434-6044
[CoEPP-MN-18-6; DESY-18-141; TTK-18-34; ADP-18-22-T1070; 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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2019-02-06
12:05
OpenAccess [PUBDB-2019-00956] Report/Journal Article
et al
$\mathrm{e^+ e^−}$ angularity distributions at NNLL′ accuracy
[DESY-18-083; SI-HEP-2018-19; LA-UR-18-24071; 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 center-of-mass energies $Q=91.2$ GeV and $Q=197$ GeV. We perform the resummation within the framework of Soft-Collinear Effective Theory, and make use of recent results for the two-loop angularity soft function. [...]
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2019-02-06
10:35
OpenAccess [PUBDB-2019-00953] Talk (non-conference) (Invited)

BSM Higgs Sectors at the LHC: tools, benchmarks and signatures
Theory Seminar, Bonn UniversityBonn, Bonn University, Germany, 31 Jan 2019 - 31 Jan 20192019-01-312019-01-31  GO
Given the experimental confirmation of the Standard Model (SM) predictions for the discovered Higgs boson as well as the non-observation of signals for beyond-the-Standard Model (BSM) physics in Run-1 and Run-2 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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2019-02-06
10:32
OpenAccess [PUBDB-2019-00952] Talk (non-conference) (Invited)

BSM Higgs Sectors at the LHC: tools, benchmarks and signatures
Theory Seminar, Mainz UniversityMainz, Mainz University, Germany, 29 Jan 2019 - 29 Jan 20192019-01-292019-01-29  GO
Given the experimental confirmation of the Standard Model (SM) predictions for the discovered Higgs boson as well as the non-observation of signals for beyond-the-Standard Model (BSM) physics in Run-1 and Run-2 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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2019-02-06
09:57
OpenAccess [PUBDB-2019-00951] Report/Journal Article

A fresh look at the calculation of tunneling actions in multi-field potentials
[arXiv:1811.09185; DESY-18-206; CERN-TH-2018-245]
The quantum decay of a metastable vacuum is exponentially suppressed by a tunneling action that can be calculated in the semi-classical approximation as the Euclidean action of a bounce that interpolates between the false and true phases. For multi-field potentials, finding the bounce is non-trivial 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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