A5065990171- Particle physics theoretical and experimental studies
- Black Holes and Theoretical Physics
- Cosmology and Gravitation Theories
- Quantum Chromodynamics and Particle Interactions
- Dark Matter and Cosmic Phenomena
- High-Energy Particle Collisions Research
- Computational Physics and Python Applications
- Physics of Superconductivity and Magnetism
- Neutrino Physics Research
- Particle Detector Development and Performance
- Distributed and Parallel Computing Systems
- Superconducting Materials and Applications
- Noncommutative and Quantum Gravity Theories
- Quantum Electrodynamics and Casimir Effect
- Quantum, superfluid, helium dynamics
- Particle Accelerators and Free-Electron Lasers
- International Science and Diplomacy
- Magnetic confinement fusion research
- Geophysics and Gravity Measurements
- Scientific Research and Discoveries
- Astrophysics and Cosmic Phenomena
- Iron Metabolism and Disorders
- Molecular spectroscopy and chirality
- Particle accelerators and beam dynamics
- Theoretical and Computational Physics
Universitat Autònoma de Barcelona
2014-2024
Institute for High Energy Physics
1997-2024
European Organization for Nuclear Research
1995-2016
Bloomberg (United States)
2006
Johns Hopkins University
2006
Universidad de Granada
1998
University of Pennsylvania
1994-1995
University of California, Santa Cruz
1992-1994
We show that a subgroup of the custodial symmetry O(3) protects Δρ from radiative corrections can also protect Zbb¯ coupling. This allows one to build models electroweak breaking, such as higgsless, little Higgs or 5D composite models, are safe Z→bb¯. when this it cannot simultaneously Ztt¯ and Wtb¯. Therefore expect measure sizable deviations SM predictions these couplings at future collider experiments. under what circumstances ZbRb¯R receive in right direction explain anomaly LEP/SLD...
We present a class of composite Higgs models arising from warped extra dimension that can satisfy all the electroweak precision tests in significant portion their parameter space. A custodial symmetry plays crucial role keeping largest corrections to observables below experimental limits. In these heaviness top quark is not only essential trigger breaking, but it also implies lowest resonance and its partners, custodians, are significantly lighter than other resonances. These custodians...
Run 2 LHC data show hints of a new resonance in the diphoton distribution at an invariant mass 750 GeV. We analyse terms boson, extracting information on its properties and exploring theoretical interpretations. Scenarios covered include narrow and, as preliminary indications suggest, wider resonance. If width persist, particle is likely to belong strongly-interacting sector. also how compatibility between 1 improved by postulating existence additional heavy particle, whose decays are...
We analyze some features of the role that extra dimensions, radius R in ${\mathrm{TeV}}^{\ensuremath{-}1}$ range, can play soft breaking supersymmetry and spontaneous electroweak symmetry. use a minimal model where gauge Higgs boson sector MSSM are living bulk five dimensions chiral multiplets four-dimensional boundary. Supersymmetry is broken by Scherk-Schwarz mechanism transmitted to boundary radiative corrections. The particle spectrum completely predicted as function unique charge....
We present an N=1 superfield formulation of supersymmetric gauge theories with a compact extra dimension. The incorporates the radion and allows to write on warped gravitational backgrounds. apply it study breaking supersymmetry by F-term radion, show that, for flat dimensions, this leads same mass spectrum as in Scherk-Schwarz models breaking. also consider scenarios where is broken boundary dimension compare them anomaly mediated models.
We point out that an anomalous gauge U(1) symmetry is a natural candidate for being the mediator and messenger of supersymmetry breaking. It facilitates dynamical breaking even in flat limit. Soft masses are induced by both gravity interactions giving unusual mass hierarchy sparticle spectrum which suppresses flavor violations. This scenario does not suffer from Polonyi problem.
In 5 dimensions the electroweak symmetry can be broken by boundary conditions, leading to a new type of Higgsless theories. These could in principle improve on 4D case extending perturbative domain energies higher than $4 πv$ and allowing better fit precision tests. Nevertheless, it is unlikely that both these improvements achieved, as we show discussing problems an explicit model.
With the discovery of Higgs at LHC, experiments have finally addressed all aspects Standard Model (SM). At this stage, it is important to understand which windows for beyond SM (BSM) physics are still open, and instead tightly closed. We address question by parametrizing BSM effects with dimension-six operators performing a global fit SM. separate into different groups constrained levels, provide independent bounds on their Wilson coefficients taking account only relevant experiments. Our...
In models of electroweak symmetry breaking in which the SM fermions get their masses by mixing with composite states, it is natural to expect top quark show properties compositeness. We study phenomenological viability having a mostly top. The strongest constraints are shown mainly come from one-loop contributions T-parameter. Nevertheless, presence light custodial partners weakens these bounds, allowing certain cases for high degree find regions parameter space T-parameter receives moderate...
A bstract We show that the dark matter (DM) could be a light composite scalar η , emerging from TeV-scale strongly-coupled sector as pseudo Nambu-Goldstone boson (pNGB). Such state arises naturally in scenarios where Higgs is also pNGB, O (6) /O (5) models, which are particularly predictive, since low-energy interactions of determined by symmetry considerations. identify region parameters has required DM relic density, satisfying at same time constraints searches LHC, well direct searches....