7,435 research outputs found
Understanding Jet Scaling and Jet Vetos in Higgs Searches
Jet counting and jet vetos are crucial analysis tools for many LHC searches.
We can understand their properties from the distribution of the exclusive
number of jets. LHC processes tend to show either a distinct staircase scaling
or a Poisson scaling, depending on kinematic cuts. We illustrate our approach
in a detailed study of jets in weak boson fusion Higgs production.Comment: 5 pages, 4 figures, 1 table. Text clarified to reflect that we
applied forward-backward tagging jet selectio
Shock-wave therapy of gastric outlet syndrome caused by a gallstone
A patient with gastric outlet syndrome (Bouveret's syndrome) caused by a large gallstone impacted in the duodenal bulb was successfully treated by extracorporeal shock-wave lithotripsy. Thus, open abdominal surgery could be avoided. For disintegration of the stone, three consecutive lithotripsy procedures were necessary. Thereafter, stone fragments could be extracted endoscopically. Extracorporeal shock-wave lithotripsy could become a non-surgical alternative in patients with obstruction of the duodenum caused by a gallstone
Exciting Collective Oscillations in a Trapped 1D Gas
We report on the realization of a trapped one dimensional Bose gas and its
characterization by means of measuring its lowest lying collective excitations.
The quantum degenerate Bose gas is prepared in a 2D optical lattice and we find
the ratio of the frequencies of the lowest compressional (breathing) mode and
the dipole mode to be , in accordance with the
Lieb-Liniger and mean-field theory. For a thermal gas we measure
. By heating the quantum degenerate gas we have
studied the transition between the two regimes. For the lowest number of
particles attainable in the experiment the kinetic energy of the system is
similar to the interaction energy and we enter the strongly interacting regime.Comment: 4 pages, 4 figure
Better Higgs-CP Tests Through Information Geometry
Measuring the CP symmetry in the Higgs sector is one of the key tasks of the
LHC and a crucial ingredient for precision studies, for example in the language
of effective Lagrangians. We systematically analyze which LHC signatures offer
dedicated CP measurements in the Higgs-gauge sector, and discuss the nature of
the information they provide. Based on the Fisher information measure, we
compare the maximal reach for CP-violating effects in weak boson fusion,
associated ZH production, and Higgs decays into four leptons. We find a subtle
balance between more theory-independent approaches and more powerful analysis
channels, indicating that rigorous evidence for CP violation in the Higgs-gauge
sector will likely require a multi-step process.Comment: 27 pages, 8 figure
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