A
bstract
We present version 2 of SM
odel
S, a program package for the fast reinterpretation of LHC searches for new physics on the basis of simplified model results. The major novelty of the SM
odel
...S v2 series is an extended topology description with a flexible number of particle attributes, such as spin, charge, decay width, etc. This enables, in particular, the treatment of a wide range of signatures with long-lived particles. Moreover, constraints from prompt and long-lived searches can be evaluated simultaneously in the same run. The current database includes results from searches for heavy stable charged particles, disappearing tracks, displaced jets and displaced leptons, in addition to a large number of prompt searches. The capabilities of the program are demonstrated by two physics applications: constraints on long-lived charged scalars in the scotogenic model, and constraints on the electroweak-ino sector in the Minimal Supersymmetric Standard Model.
A
bstract
We constrain the Higgs-portal model employing the vector-boson fusion channel at the LHC. In particular, we include the phenomenologically interesting parameter region near the Higgs ...resonance, where the Higgs-boson mass is close to the threshold for dark-matter production and a running-width prescription has to be employed for the Higgs- boson propagator. Limits for the Higgs-portal coupling as a function of the dark-matter mass are derived from the CMS search for invisible Higgs-boson decays in vector-boson fusion at 13 TeV. Furthermore, we perform projections for the 14 TeV HL-LHC and the 27 TeV HE-LHC taking into account a realistic estimate of the systematic uncertainties. The respective upper limits on the invisible branching ratio of the Higgs boson reach a level of 2% and constrain perturbative Higgs-portal couplings up to dark-matter masses of about 110 GeV.
A
bstract
Studies of dark matter lie at the interface of collider physics, astrophysics and cosmology. Constraining models featuring dark matter candidates entails the capability to provide accurate ...predictions for large sets of observables and compare them to a wide spectrum of data. We present a framework which, starting from a model Lagrangian, allows one to consistently and systematically make predictions, as well as to confront those predictions with a multitude of experimental results. As an application, we consider a class of simplified dark matter models where a scalar mediator couples only to the top quark and a fermionic dark sector (i.e. the simplified top-philic dark matter model). We study in detail the complementarity of relic density, direct/indirect detection and collider searches in constraining the multi-dimensional model parameter space, and efficiently identify regions where individual approaches to dark matter detection provide the most stringent bounds. In the context of collider studies of dark matter, we point out the complementarity of LHC searches in probing different regions of the model parameter space with final states involving top quarks, photons, jets and/or missing energy. Our study of dark matter production at the LHC goes beyond the tree-level approximation and we show examples of how higher-order corrections to dark matter production processes can affect the interpretation of the experimental results.
Trust is highlighted as central to effective disease management. During the COVID‐19 pandemic, Denmark seemed to embody this understanding. Characterizing the Danish response were high levels of ...public compliance with government regulations and restrictions coupled with high trust in the government and other members of society. In this article, we first revisit prior claims about the importance of trust in securing compliant citizen behaviour based on a weekly time‐use survey that we conducted during the first weeks of the COVID‐19 pandemic (2 April–18 May 2020). Analysis of activity episodes, rather than merely self‐reported compliance, both reconfirms the importance of institutional trust and nuances prior suggestions of detrimental effects of trust in other citizens. These survey‐based results are further augmented through thematic analysis of 21 in‐depth interviews with respondents sampled from the survey participants. The qualitative analysis reveals two themes, the first focusing on trust in others in Danish society and the second on the history of trust in Denmark. Both themes are based on narratives layered in cultural, institutional and inter‐personal levels and further underline that institutional and social trust are complementary and not countervailing. We conclude by discussing how our analysis suggests pathways towards an increased social contract between governments, institutions and individuals that might be of use during future global emergencies and to the overall functioning of democracies.
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BFBNIB, DOBA, FZAB, GIS, IJS, IZUM, KILJ, NLZOH, NUK, OILJ, PILJ, PNG, SAZU, SBCE, SBMB, SIK, UILJ, UKNU, UL, UM, UPUK
Nonthermalized dark matter is a cosmologically valid alternative to the paradigm of weakly interacting massive particles. For dark matter belonging to a Z2-odd sector that contains in addition a ...thermalized mediator particle, dark matter production proceeds, in general, via both the freeze-in and super-WIMP mechanism. We highlight their interplay and emphasize the connection to long-lived particles at colliders. For the explicit example of a colored t-channel mediator model we map out the entire accessible parameter space, cornered by bounds from the LHC, big bang nucleosynthesis and Lyman-α forest observations, respectively. We discuss prospects for the HL- and HE-LHC.
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CMK, CTK, FMFMET, IJS, NUK, PNG, UM
Trilinear-augmented gaugino mediation Heisig, Jan; Kersten, Jörn; Murphy, Nick ...
The journal of high energy physics,
05/2017, Volume:
2017, Issue:
5
Journal Article
Peer reviewed
Open access
A
bstract
We consider a gaugino-mediated supersymmetry breaking scenario where in addition to the gauginos the Higgs fields couple directly to the field that breaks supersymmetry. This yields ...non-vanishing trilinear scalar couplings in general, which can lead to large mixing in the stop sector providing a sufficiently large Higgs mass. Using the most recent release of F
eyn
H
iggs
, we show the implications on the parameter space. Assuming a gravitino LSP, we find allowed points with a neutralino, sneutrino or stau NLSP. We test these points against the results of Run 1 of the LHC, considering in particular searches for heavy stable charged particles.
In this article we report evidence from a series of semi-structured interviews with a broad sample of people living in Denmark ( n = 21), about their perspectives on the future during the first ...months of the global Covid-19 pandemic. The thematic and discursive analyses, based on an abductive ontology, illustrate imaginings of the future along two vectors: individual to collective and descriptive to moral. On a descriptive and individual level, people imagined getting through the pandemic on a myopic day-by-day basis; on a descriptive and collective level, people imagined changes to work and socializing. Their future was bound and curtailed by their immediate present. On a moral and individual level, respondents were less detailed in their reports, but some vowed to change their behaviors. On a moral and collective level, respondents reported what the world should be like and discussed changes to environmental behaviors such as traveling, commuting, and work. The model suggests the domain of individual moral imaginings is the most difficult domain for people to imagine beyond the practicalities of their everyday lives. The implications of this model for comprehending imaginations of the future are discussed.
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NUK, OILJ, SAZU, UKNU, UL, UM, UPUK
Motivated by ongoing debates over welfare state retrenchment and growing economic insecurity, this book compares the situation of older workers in Germany and the United States over the past three ...decades. Both nations are seeing a rise in insecurity for older workers, but the differences in support programs, pensions, and retirement options have led to differing outcomes for workers faced with early retirement or job loss.
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