1,103 research outputs found
A Physics Show Performed by Students for Kids: From Mechanics to Elementary Particle Physics
We describe an initiative at the University of Bonn, where the students
develop and perform a 2 hour physics show for school classes and the general
public. The show is entertaining and educational and is aimed at children aged
10 and older. For the physics students this is a unique experience to apply
their knowledge at an early stage and gives them the chance to develop skills
in the public presentation of science, in front of 520 people per show. We have
extended the activity to put on an elementary particle physics show for
teenagers. Furthermore, local high schools have picked up the idea; their
students put on similar shows for fellow students and parents. We would be
interested in hearing about related activities elsewhere.Comment: 6 Pages, LateX, 3 Figures. High quality figures available from
author. Journal submission notice adde
All Possible Lightest Supersymmetric Particles in R-Parity Violating mSUGRA Models and their Signals at the LHC
We consider minimal supergravity (mSUGRA) models with an additional R-parity
violating operator at the grand unification scale. This can change the
supersymmetric spectrum leading on the one hand to a sneutrino, smuon or squark
as the lightest supersymmetric particle (LSP). On the other hand, a wide
parameter region is reopened, where the scalar tau is the LSP. It is vital to
know the nature of the LSP, because supersymmetric particles normally cascade
decay down to the LSP at collider experiments. We investigate in detail the
conditions leading to non-neutralino LSP scenarios. We also present some
typical LHC signatures.Comment: 4 pages, 4 figures, submitted for the proceedings of the SUSY09
conferenc
Contact Interactions Probe Effective Dark Matter Models at the LHC
Effective field theories provide a simple framework for probing possible dark
matter (DM) models by reparametrising full interactions into a reduced number
of operators with smaller dimensionality in parameter space. In many cases
these models have four particle vertices, e.g. qqXX, leading to the pair
production of dark matter particles, X, at a hadron collider from initial state
quarks, q. In this analysis we show that for many fundamental DM models with
s-channel DM couplings to qq-pairs, these effective vertices must also produce
quark contact interactions (CI) of the form qqqq. The respective effective
couplings are related by the common underlying theory which allows one to
translate the upper limits from one coupling to the other. We show that at the
LHC, the experimental limits on quark contact interactions give stronger
translated limits on the DM coupling than the experimental searches for dark
matter pair production.Comment: 6 pages, 3 figure
Bounds on R-parity Violation from Resonant Slepton Production at the LHC
We consider the ATLAS and CMS searches for dijet resonances, as well as the
ATLAS search for like-sign dimuon pairs at the LHC with 7 TeV center of mass
energy. We interpret their exclusions in terms of bounds on the supersymmetric
R-parity violating parameter space. For this we focus on resonant slepton
production followed by the corresponding decay.Comment: 17 pages, 11 figures, 3 table
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