HEP Monday Seminar Abstracts
Searches for the Physics beyond the Standard Model
at the Tevatron
Beate Heinemann
"Despite the tremendous success of the Standard Model of particle
physics there are good reasons to believe that it is only an effective
theory and a richer structure is present a higher energies. In
particular the presence of new particles at the TeV scale would address
a few of the most prominent problems of the Standard Model. At the
present time the CDF and D0 experiments at the Tevatron
proton-antiproton collider at Fermilab near Chicago is the highest
energy collider operating at a center-of-mass energy of 2 TeV. I will
present the latest results of searches for many new hypothetical
particles, as predicted e.g. by supersymmetry, models with extra
dimensions, models with extended gauge sectors, and by compositeness
models. "
High Energy Neutrinos from the Cold: Status and
Perspectives of the IceCube Experiment
Cecile Roucelle The observation of
high energy neutrinos from cosmic objects is expected to bring us key
information about the most energetic processes known in the universe,
such as gamma ray bursts and events in the surroundings of supermassive
black holes. Their observation could also help us to understand the
mechanism for cosmic ray acceleration, a long-standing puzzle. High
energy neutrinos may also elucidate the nature of the dark matter, via
the observation of WIMPs annihilation into neutrinos. In recent years,
several projects aiming at the observation of high energy neutrinos
have been developed. The most ambitious, and most advanced of these is
the IceCube Neutrino Observatory currently under construction at the
geographic South Pole. When completed in 2011, IceCube will consist of
an instrumented ice volume of about one cubic kilometer, together with
a surface air shower array of matching dimensions. Twenty two out of
the eighty foreseen strings are already taking data and the first
physics analyses using IceCube data are being developed within the
collaboration. At the time of this seminar, the deployment season for
2007/2008 will have ended, bringing the number of immersed string to
40. An overview of high energy neutrino astronomy will be given, with
special emphasis on expectations for IceCube. We will also present the
status of the experiment and some recent results obtained with this
experiment.
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Colored Resonances at the Tevatron:
Phenomenology and Discovery Potential in Multijets
Can Kilic There exist
several classes of theories beyond the Standard Model which
contain massive spin-1 color octets, generically called "colorons".
Indeed we argue that colorons inevitably appear in the spectrum
whenever new colored particles feel an additional confining force.
Colorons are distinctive at hadron colliders as this is the only
environment in which they can be resonantly produced. In the simplest
models we show that the coloron naturally decays to multijets via
secondary resonances, which can be consistent with all existing bounds,
even for colorons as light as a few hundred GeV. We perform
representative case studies and show that a search in the four-jet
channel at the Tevatron has strong signal significance, while the LHC
faces formidable challenges for such a search.