4,262 research outputs found
Supersymmetry
The determination of supersymmetric parameters at the LHC in favorable as
well as difficult scenarios is presented. If discovered and measured at the LHC
and the ILC, supersymmetry may provide a link between collider physics and
cosmology.Comment: Invited talk at XVII International Workshop on Deep-Inelastic
Scattering and Related Subjects DIS 2009, 26-30 April 2009, Madrid. 5 pages,
5 figure
Measuring Hidden Higgs and Strongly-Interacting Higgs Scenarios
Higgs couplings can be affected by physics beyond the Standard Model. We
study modifications through interactions with a hidden sector and in specific
composite Higgs models accessible at the LHC. Both scenarios give rise to
congruent patterns of universal, or partially universal, shifts. In addition,
Higgs decays to the hidden sector may lead to invisible decay modes which we
also exploit. Experimental bounds on such potential modifications will measure
the concordance of an observed Higgs boson with the Standard Model.Comment: 12 pages, 7 figures; version to be published in Phys. Lett.
Electroweak Symmetry Breaking and Higgs Physics
An introduction to electroweak symmetry breaking and Higgs physics is
presented for the Standard Model and its supersymmetric extensions. A brief
overview will also be given on strong interactions of the electroweak gauge
bosons in alternative scenarios. In addition to the theoretical basis, the
present experimental status of Higgs physics and implications for future
experiments at the LHC and linear colliders are discussed.Comment: 70 pages, latex, 30 figure
Doubly Charged Higgsino Pair Production and Decays in e+e- Collisions
In supersymmetric grand unified theories, light higgsino multiplets generally
exist in addition to the familiar chargino/neutralino multiplets of the minimal
supersymmetric extension of the Standard Model. The new multiplets may include
doubly charged states and . We
study the properties and the production channels of these novel higgsinos in
and collisions, and investigate how their properties
can be analyzed experimentally.Comment: LATEX, 25 pages, ps figures include
SUSY parameter determination
The impact of the LHC, SLHC and the ILC on the precision of the determination
of supersymmetric parameters is investigated. In particular, in the point SPS1a
the measurements performed at the ILC will improve by an order of magnitude the
precision obtained by the LHC alone. The SLHC with respect to the LHC has the
potential to reduce the errors by a factor two.Comment: Invited talk at 2005 International Linear Collider Physics and
Detector Workshop and Second ILC Accelerator Workshop, Snowmass,
CO(Snowmass05) 3 pages, LaTe
SFITTER: SUSY Parameter Analysis at LHC and LC
SFITTER is a new analysis tool to determine supersymmetric model parameters
from collider measurements. Using the set of supersymmetric mass measurements
at the LC and at the LHC we show how both colliders probe different sectors of
the MSSM Lagrangian. This observation is a strong motivation to move from a
parameter fit assuming a certain model to the unconstrained weak-scale MSSM
Lagrangian. We argue how the technical challenges can be dealt with in a
combined fit/grid approach with full correlations.Comment: contribution to LHC-LC Study Group, G.Weiglein et a
Extraction of SUSY Parameters from Collider Data
The extraction of the parameters of the supersymmetric Lagrangian is discusse
d. Particular emphasis is put on the rigorous treatment of experimental and
theo retical errors. While the LHC can provide a valuable first estimate of the
parameters, the combination of LHC and ILC will be nece ssary to determine with
high precision the parameters of the MSSM.Comment: 6 pages, 4 figures, Proceedings of plenary talk at SUSY08 in Seoul,
Korea (typos corrected
Gluon Fragmentation to Gluonium
The fragmentation of gluons to gluonium states is analyzed qualitatively in
the non-perturbative region. The convolution of this mechanism with
perturbative gluon radiation leaves us with a hard component in the
fragmentation of gluon to gluonium.Comment: 6 pages with 2 figures, LaTe
The Higgs Sector of the Next-to-Minimal Supersymmetric Standard Model
The Higgs boson spectrum of the Next-to-Minimal Supersymmetric Standard Model
is examined. The model includes a singlet Higgs field S in addition to the two
Higgs doublets of the minimal extension. `Natural' values of the parameters of
the model are motivated by their renormalization group running and the vacuum
stability. The qualitative features of the Higgs boson masses are dependent on
how strongly the Peccei-Quinn U(1) symmetry of the model is broken, measured by
the self-coupling of the singlet field in the superpotential. We explore the
Higgs boson masses and their couplings to gauge bosons for various
representative scenarios.Comment: 32 pages with 12 figures; references and parameters updated; a few
minor comments adde
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