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2018-09-27
16:23
arXiv [PUBDB-2018-03667] Report/Journal Article
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Lyman-$\alpha$ forest constraints on interacting dark sectors
[DESY-18-081; TUM-HEP-1141-18; arXiv:1805.12203]
The Lyman-$α$ forest is a valuable probe of dark matter models featuring a scale-dependent suppression of the power spectrum as compared to $Λ$CDM . In this work, we present a new estimator of the Lyman-$α$ flux power spectrum that does not rely on hydrodynamical simulations [...]
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2018-09-17
15:06
OpenAccess [PUBDB-2018-03521] Preprint/Report
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Bubble wall velocities in the Standard Model and beyond
[DESY-18-162; arXiv:1809.04907]
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We present results for the bubble wall velocity and bubble wall thickness during a cosmological first-order phase transition in a condensed form. Our results are for minimal extensions of the Standard Model but in principle are applicable to a much broader class of settings. [...]
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2018-09-13
09:59
[PUBDB-2018-03486] Journal Article/Report/Contribution to a conference proceedings

The serendipity of electroweak baryogenesis
[DESY-18-131]
Higgs cosmology : Theo Murphy meeting, BuckinghamshireBuckinghamshire, UK, 27 Mar 2017 - 28 Mar 20172017-03-272017-03-28 Philosophical transactions of the Royal Society of London / A 376(2114), 20170124 - () [10.1098/rsta.2017.0124]  GO
The origin of the matter–antimatter asymmetry of the universe remains unexplained in the Standard Model (SM) of particle physics. The origin of the flavour structure is another major puzzle of the theory. [...]
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2018-09-11
11:32
[PUBDB-2018-03438] Journal Article
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Search for WISPs gains momentum
CERN courier 58(7), 25 - 33 ()  GO
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2018-09-05
12:07
OpenAccess [PUBDB-2018-03389] Preprint/Report
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Strong constraints on clustered primordial black holes as dark matter
[DESY-18-132; arXiv:1808.05910]
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The idea of dark matter in the form of primordial black holes has seen a recent revival triggered by the LIGO detection of gravitational waves from binary black hole mergers. In this context, it has been argued that a large initial clustering of primordial black holes can help alleviate the strong constraints on this scenario. [...]
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2018-09-05
12:02
OpenAccess [PUBDB-2018-03388] Preprint/Report
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BBN constraints on MeV-scale dark sectors. Part II. Electromagnetic decays
[DESY-18-133; arXiv:1808.09324]
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Meta-stable dark sector particles decaying into electrons or photons may non-trivially change the Hubble rate, lead to entropy injection into the thermal bath of Standard Model particles and may also photodisintegrate light nuclei formed in the early universe. We study generic constraints from Big Bang Nucleosynthesis on such a setup, with a particular emphasis on MeV-scale particles which are neither fully relativistic nor non-relativistic during all times relevant for Big Bang Nucleosynthesis. [...]
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2018-09-05
11:55
OpenAccess [PUBDB-2018-03387] Preprint/Report
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$e^+ e^-$ angularity disributions at NNLL$^\prime$ accuracy
[DESY-18-083; SI-HEP-2018-19; LA-UR-18-24071; arXiv:1808.07867]
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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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2018-09-05
10:09
OpenAccess [PUBDB-2018-03375] Preprint/Report
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MSSM Higgs Boson Searches at the LHC: Benchmark Scenarios for Run 2 and Beyond
[DESY-18-140; MPP-2018-211; KA-TP-25-2018; IFT-UAM/CSIC-18-017; EFI-18-12; arXiv:1808.07542]
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We propose six new benchmark scenarios for Higgs boson searches in the Minimal Supersymmetric Standard Model. Our calculations follow the recommendations of the LHC Higgs Cross Section Working Group, and benefit from recent developments in the predictions for the Higgs-boson masses and mixing. [...]
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2018-09-05
10:04
OpenAccess [PUBDB-2018-03374] Preprint/Report

Exact instantons via worldline deformations
[DESY-18-145; arXiv:1808.06868]
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The imaginary part of the one loop effective action in external backgrounds can be efficiently computed using worldline instantons which are closed periodic paths in spacetime. Exact solutions for nonstatic backgrounds are only known in certain cases. [...]
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2018-09-05
09:59
OpenAccess [PUBDB-2018-03373] Preprint/Report

Entanglement entropy on finitely ramified graphs
[DESY-18-146; arXiv:1808.10391]
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We compute the entanglement entropy in a composite system separated by a finitely ramified boundary with the structure of a self-similar lattice graph. We derive the entropy as a function of the decimation factor which determines the spectral dimension, the latter being generically different from the topological dimension. [...]
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