1,223 research outputs found
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Brexiting European Citizenship through the Voice of Others
The British vote on 23rd June, opting by a rather slim majority to leave the European Union, has sent waves of uncertainty rippling through the island and the continent, as well as through some milestones of European integration. One of these is European citizenship. Paradoxically, it receives a hard shake at the hand of national citizenships, exercised through a referendum
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Divorce Immediately, or Leave. Rights of Third Country Nationals and Family Protection in the Context of EU Citizens' Free Movement: Kuldip Singh and Others.
Case C-218/14, Kuldip Singh and Others v. Minister for Justice and Equality,
judgment of the Court (Grand Chamber) of 16 July 2015, EU:C:2015:476
Higgs Mass and Unnatural Supersymmetry
Assuming that supersymmetry exists well above the weak scale, we derive the
full one-loop matching conditions between the SM and the supersymmetric theory,
allowing for the possibility of an intermediate Split-SUSY scale. We also
compute two-loop QCD corrections to the matching condition of the Higgs quartic
coupling. These results are used to improve the calculation of the Higgs mass
in models with high-scale supersymmetry or split supersymmetry, reducing the
theoretical uncertainty. We explore the phenomenology of a mini-split scenario
with gaugino masses determined by anomaly mediation. Depending on the value of
the higgsino mass, the theory predicts a variety of novel possibilities for the
dark-matter particle.Comment: 36 pages, 13 pdf figures; v2: matches version published in JHE
Softened Gravity and the Extension of the Standard Model up to Infinite Energy
Attempts to solve naturalness by having the weak scale as the only breaking
of classical scale invariance have to deal with two severe difficulties:
gravity and the absence of Landau poles. We show that solutions to the first
problem require premature modifications of gravity at scales no larger than
GeV, while the second problem calls for many new particles at the
weak scale. To build models that fulfil these properties, we classify
4-dimensional Quantum Field Theories that satisfy Total Asymptotic Freedom
(TAF): the theory holds up to infinite energy, where all coupling constants
flow to zero. We develop a technique to identify such theories and determine
their low-energy predictions. Since the Standard Model turns out to be
asymptotically free only under the unphysical conditions ,
GeV, , GeV, we explore some of its weak-scale
extensions that satisfy the requirements for TAF.Comment: 60 pages. Final version to appear on JHEP. v3: references adde
The light stop window
We show that a right-handed stop in the 200-400 GeV mass range, together with
a nearly degenerate neutralino and, possibly, a gluino below 1.5 TeV, follows
from reasonable assumptions, is consistent with present data, and offers
interesting discovery prospects at the LHC. Triggering on an extra jet produced
in association with stops allows the experimental search for stops even when
their mass difference with neutralinos is very small and the decay products are
too soft for direct observation. Using a razor analysis, we are able to set
stop bounds that are stronger than those published by ATLAS and CMS.Comment: 21 pages, 9 figures. v2: fig. 9b has been updated and revised at
large values of the stop/neutralino mass splitting. The discussion of stop
co-annihilations has been upgraded including Sommerfeld enhancement
The likelihood for supernova neutrino analyses
We derive the event-by-event likelihood that allows to extract the complete
information contained in the energy, time and direction of supernova neutrinos,
and specify it in the case of SN1987A data. We resolve discrepancies in the
previous literature, numerically relevant already in the concrete case of
SN1987A data.Comment: 7 pages, 2 figures. Accepted for publication in PR
Stabilization of the Electroweak Vacuum by a Scalar Threshold Effect
We show how a heavy scalar singlet with a large vacuum expectation value can
evade the potential instability of the Standard Model electroweak vacuum. The
quartic interaction between the heavy scalar singlet and the Higgs doublet
leads to a positive tree-level threshold correction for the Higgs quartic
coupling, which is very effective in stabilizing the potential. We provide
examples, such as the see-saw, invisible axion and unitarized Higgs inflation,
where the proposed mechanism is automatically implemented in well-defined
ranges of Higgs masses.Comment: 18 pages, 5 figure
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EU integration in the (post)-migrant-crisis context: learning new integration modes?
This article explores the integration of the European Union (EU) as an institution after the 2015-2016 migrant crisis. Qualitative data from elite interviews in Brussels and policy analysis, in the framework of a bigger project about the impact of the migrant crisis on European integration, highlight the EU learning about new integration modes as a key theme following the crisis. The article focuses on this theme and argues that EU integration has been happening through intensive learning after the-migrant crisis, whereby the EU has been exploring a combination of certain integration modes: shaping the relationships with candidate countries by restraining from enlargement; shaping the relationships with (prospectively) exiting Member States by considering fuzziness at the borders; exploring differentiation among the existing Member States, possibly through promoting a two-tier EU, instead of universal deepening. A key contribution lies in applying the notion âlearningâ to understanding EU integration modes specifically after the migrant crisis
Recommended from our members
Brexiting European Citizenship through the Voice of Others
The British vote on 23rd June, opting by a rather slim majority to leave the European Union, has sent waves of uncertainty rippling through the island and the continent, as well as through some milestones of European integration. One of these is European citizenship. Paradoxically, it receives a hard shake at the hand of national citizenships, exercised through a referendum
Recommended from our members
EU citizenship and transnational rights. Chronicles of a troubled narrative
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