453 research outputs found

    Automatised matching between two scalar sectors at the one-loop level

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    Nowadays, one needs to consider seriously the possibility that a large separation between the scale of new physics and the electroweak scale exists. Nevertheless, there are still observables in this scenario, in particular the Higgs mass, which are sensitive to the properties of the UV theory. In order to obtain reliable predictions for a model which involves very heavy degrees of freedom, the precise matching to an effective theory is necessary. While this has been so far only studied for a few selected examples, we present an extension of the Mathematica{\tt Mathematica} package SARAH{\tt SARAH} to perform automatically the matching between two scalar sectors at the full one-loop level for general models. We show that we can reproduce all important results for commonly studied models like split- or high-scale supersymmetry. One can now easily go beyond that and study new ideas involving very heavy states, where the effective model can either be just the standard model or an extension of it. Also scenarios with several matching scales can be easily considered. We provide model files for the MSSM with seven different mass hierarchies as well as two high-scale versions of the NMSSM. Moreover, it is explained how new models are implemented

    Monopolistische Bottlenecks versus wettbewerbsfähige Bereiche im Telekommunikationssektor

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    Regulating European telecommunications markets: Unbundled access to the local loop outside urban areas

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    This paper examines the topic of unbundled access to the local loop in areas which show characteristics of non-contestable natural monopolies outside the large cities. Under the heading "local loop unbundling" three variants are discussed, full unbundling, line sharing, and bitstream access. An obligation to provide competitors access to local networks on an unbundled basis is a strong intervention into the property rights of the regulated firm. In this light the following points particularly come into question: Who should be granted the right to access local loops on an unbundled basis? Which form(s) of local loop unbundling should be enforced

    A tentative 4- isomeric state in Sr-98

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    Annual Report 2001, Institut fuer Kernchemie, Johannes-Gutenberg-Universitaet, Mainz, GermanyComment: 3 pages, 1 figur

    Two-Loop Corrections to Higgs Boson Masses in the NMSSM

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    In dieser Dissertation werden Quantenkorrekturen zu Higgs Boson Massen in dem ladungs- und paritätsverletzenden Nicht-Minimalen Supersymmetrischen Standardmodell auf Zweischleifenordnung berechnet. Der Fokus dieser Arbeit liegt auf jenen Korrekturen, welche ausschließlich im nicht-minimalen nicht aber im Minimalen Supersymmetrischem Standard modell auftreten. Diese Beträge sind deshalb interessant, weil die korrigierten Higgs Boson Massen Einfluss auf Vorhersagen haben können, welche experimentell an Teilchenbeschleunigern getestet werden. Daher können die Higgsmassenkorrekturen die Aussicht auf eine Entdeckung des betrachteten Modells beeinflussen. Des Weiteren können die hier vorgestellten Korrekturen auch für zukünftige Untersuchungen anderer Modelle von Interesse sein. Der Grund dafür ist das Auftreten von (infra-rot) Divergenzen, welche nicht für derartige Berechnungen in minimalen Modellen üblich sind. Die verschiedenen Lösungen für dieses Problem, welche in dieser Arbeit studiert werden, können daher auch in anderen nicht-minimalen Modellrechnungen angewandt werden. Darüber hinaus macht diese Arbeit Aussagen über die Genauigkeit der störungstehorischen Resultate zu den Higgs Boson Massen unter Zuhilfenahme der Abhängigkeit derselbigen von der Wahl des Renormierungsschemata und der Renormierungsskala. Insbesondere werden gemischte OS/DR Renormierungsschemata im Higgs Boson Sektor aber auch im top/stop Sektor der Theorie angewandt. Es wird gezeigt, dass die relativen Korrekturen bis zu 6% groß werden können. In dem Bereich des Modells, welcher mit Unitarität unterhalb der Skala an der sich die Eichkopplungen treffen kompatibel ist, sind die Korrekturen jedoch nicht größer als 3%. Des Weiteren beträgt die theoretische Unsicherheit abgeleitet aus der Variation des Renormierungsschematas in etwa 1-8% und die abgeleitet aus der Renormierungsskala in etwa 0-3%

    A K=3 two-quasiparticle isomer in 98^{98}Sr

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    The decay of on-line mass-separated 98 Rb to 98 Sr is studied by γ spectroscopy. The revised decay scheme adds further evidence of the coexistence of very different shapes in 98 Sr . A set of levels is proposed to originate from particle-hole pair excitations across the Z = 40 spherical gap in analogy with 96 Sr . A deformed K = 3 band with probable even parity is built on a 7.1-ns isomer at 1838 keV. It is interpreted as a two-quasineutron excitation in accordance with a quantum Monte Carlo pairing calculation based on a deformed shell model. Configurations of the calculated lowest-lying two-quasiparticle levels confirm the importance of the [404]9/2 neutron orbital at the largest deformations in the neutron-rich A ≃ 100 region

    Associations Between Combat Exposure, Moral Injury, and Suicidality Among U.S. Military Members: The Moderating Impact of Positive Rumination

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    Numerous studies have documented the risk for suicide among recent-era veterans with combat experience. Recently, moral injury has emerged as a possible contributor to suicidality in veterans. To that end, no study has approached the combat exposure-moral injury-suicidality link with a focus grounded in positive psychology. Specifically, the present study explored whether positive rumination, or the reflection on positive emotions and moods, may buffer the deleterious effects of potentially traumatic experiences in warzones on moral injury and suicidality. This study was a secondary analysis of 250 current or former U.S. military members (Mage = 33.3 years) who had deployed at least one time as part of their occupational duties. Participants completed an online survey that assessed combat exposure, moral injury, suicidality, and responses to positive affect. Combat exposure, moral injury, and suicidality were all positively associated. In the mediation model, moral injury did not mediate the relationship between combat exposure and suicidality. In the moderated mediation model, positive rumination moderated the indirect effect of combat exposure on suicide via moral injury, as well as all three direct relationships between combat, moral injury, and suicidality. These findings provide much needed insight into the effects of combat on military mental health. Additionally, results suggest positive rumination may serve as a buffer to reduce the associations between combat exposure, moral injury, and suicidality. Implications from the present study may be used to promote awareness of positive affective states and encourage research on positive rumination inducing strategies for combat veterans, at-risk military members, or as prevention strategies for general military populations

    Together Here: Immersive Theatre, Audience, and Space

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    Immersive theatre is an important type of modern theatre, notable for its emphasis on bodily engagement. This thesis examines the significance of theatrical and found spaces in immersive work and the potential for immersive theatre to engage its audiences’ bodies in new ways. After first exploring the importance of lived experience in a digital age, the paper moves on to examine the connection between agency, intimacy, proximity, and body. The third section considers the importance of audiences’ bodies as part of an immersive performance, both as sites of intimate interaction and as agents within the work, with a focus on how space and design are used to engage spectators’ bodies through the multisensory experience. The final section of the paper addresses a series of immersive performances created as part of this thesis; these immersive works, each themed around a different season, experiment with immersive strategies while all being set in the same location

    The O(αt+αλ+ακ)2{\cal O}(\alpha_t+\alpha_\lambda+\alpha_\kappa)^2 Correction to the ρ\rho Parameter and its Effect on the W Boson Mass Calculation in the Complex NMSSM

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    We present the prediction of the electroweak ρ\rho parameter and the WW boson mass in the CP-violating Next-to-Minimal Supersymmetric extension of the Standard Model (NMSSM) at the two-loop order. The ρ\rho parameter is calculated at the full one-loop and leading and sub-leading two-loop order O(α+αtαs+(αt+αλ+ακ)2)\mathcal{O}(\alpha + \alpha_t\alpha_s + \left(\alpha_t+\alpha_\lambda+\alpha_\kappa\right)^2). The new Δρ\Delta \rho prediction is incorporated into a prediction of MWM_W via a full supersymmetric (SUSY) one-loop calculation of Δr\Delta r. Furthermore, we include all known state-of-the-art SM higher-order corrections to Δr\Delta r. By comparing results for Δρ\Delta \rho obtained using on-shell (OS) and DR\overline{\mathrm{DR}} renormalization conditions in the top/stop sector, we find that the scheme uncertainty is reduced at one-loop order by 55%, at two-loop O(αsαt)\mathcal{O}(\alpha_s\alpha_t) by 22%, and at two-loop O(αt+ακ+αλ)2\mathcal{O}(\alpha_t+\alpha_\kappa+\alpha_\lambda)^2 by 16%, respectively. The influence of the two-loop results on the MWM_W mass prediction is found to be sub-leading. The new calculation is made public in the computer program NMSSMCALC\mathrm{\tt NMSSMCALC}. We perform an extensive comparison in the WW-mass, Higgs boson mass and the muon anomalous magnetic moment prediction between our calculation and three other publicly available tools and find very good agreement provided that the input parameters and renormalization scales are treated in the same way. Finally, we study the impact of the CP-violating phases on the WW-mass prediction which is found to be smaller than the overall size of the SUSY corrections
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