4,940 research outputs found
Anomalously interacting extra neutral bosons
We study phenomenological consequences of the Standard Model extension by the
new spin-1 chiral fields with the internal quantum numbers of the electroweak
Higgs doublets. There are at least three different classes of theories, all
motivated by the hierarchy problem, which predict new vector weak-doublets with
masses not far from the electro-weak scale. We discuss resonance production of
these neutral chiral Z* bosons at hadron colliders. The bosons can be observed
as a Breit-Wigner resonance peak in the invariant dilepton mass distributions
in the same way as the well-known extra gauge Z' bosons. This includes them
into a list of very interesting objects for early searches with the first LHC
data. Moreover, the Z* bosons have unique signatures in transverse momentum,
angular and pseudorapidity distributions of the final leptons, which allow to
distinguish them from the other heavy neutral resonances.Comment: 8 pages, 9 figures, uses cimento.cls: for Proceedings of the 2010
Rencontres de Physique de la Vallee d'Aoste, La Thuil
Classical Matrix sine-Gordon Theory
The matrix sine-Gordon theory, a matrix generalization of the well-known
sine-Gordon theory, is studied. In particular, the -generalization where
fields take value in describes integrable deformations of conformal
field theory corresponding to the coset . Various
classical aspects of the matrix sine-Gordon theory are addressed. We find exact
solutions, solitons and breathers which generalize those of the sine-Gordon
theory with internal degrees of freedom, by applying the Zakharov-Shabat
dressing method and explain their physical properties. Infinite current
conservation laws and the B\"{a}cklund transformation of the theory are
obtained from the zero curvature formalism of the equation of motion. From the
B\"{a}cklund transformation, we also derive exact solutions as well as a
nonlinear superposition principle by making use of the Bianchi's permutability
theorem.Comment: 25 pages, 6 Postscript figure
Search for gluinos with ATLAS at LHC
Prospects for ATLAS observation of a SUSY-like signal from two gluinos are
investigated within a certain region of the mSUGRA parameter space, where the
cross section of the two gluinos production via gluon-gluon fusion is estimated
at a rather high level of 13 pb. The event selection trigger uses a very clear
signature of the process (4 jets + 4 muons + up to 4 secondary vertices
topology) when final decay products of each gluino are b-anti-b and
muon-anti-muon pairs and the lightest SUSY particle, the neutralino. Rather
high transverse missing energy carried away by two neutralinos is an essential
signature of the event and also allows the relevant Standard Model background
to be reduced significantly. The generation and reconstruction processes are
performed by means of the ATLAS common software framework ATHENA.Comment: LaTeX, 9 pages, 7 eps figure
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