4,004 research outputs found
Physics objects for top quark physics in ATLAS
Top quark physics measurements performed using data from the ATLAS detector
at the LHC rely on efficient reconstruction and precise calibration of leptons,
jets and missing transverse energy. A review of the techniques used to
reconstruct such objects is given, with an emphasis on the uncertainties
achieved for energy calibration and efficiency measurements, illustrated with
their impact on key top quark physics results.Comment: 5 pages, 3 figures, proceedings of Top2016 conferenc
Inclusive cross-section measurements at LHC
A review of ATLAS and CMS measurements of the inclusive production
cross-section in collisions at 7-13 TeV is presented, focusing
on the most precise results in the dilepton and lepton+jets final states. The
measurements are in good agreement with state-of-the-art QCD predictions, and
have been used to determine the top quark pole mass and provide constraints on
proton parton distribution functions.Comment: 5 pages, 3 figures, proceedings of the Top2017 conferenc
Electroweak and CP violation physics at a Linear Collider Z-factory
A future linear collider such as TESLA may be able to run on the Z0 resonance
with very high luminosity and polarised electron and positron beams. The
possibilities of measuring electroweak quantities with high precision are
investigated. Huge improvements with respect to the present precision can be
expected, especially for the asymmetries A_LR and A_b where beam polarisation
can be exploited. The very large sample of Z to bbbar events also allows
studies of various CP-violating b decays. The precision achievable on the CKM
unitarity triangle angles is comparable to experiments at b factories and
future hadron colliders.Comment: 26 pages, 11 figures. To be submitted to European Journal of Physics
Direc
Theoretical models of helicopter rotor noise
For low speed rotors, it is shown that unsteady load models are only partially successful in predicting experimental levels. A theoretical model is presented which leads to the concept of unsteady thickness noise. This gives better agreement with test results. For high speed rotors, it is argued that present models are incomplete and that other mechanisms are at work. Some possibilities are briefly discussed
Some forced wave problems in fluid mechanics
Imperial Users onl
Top quark property measurements at the LHC
Measurements of top quark properties performed at the Large Hadron Collider
are reviewed, with a particular emphasis on top-pair charge asymmetries, spin
correlations and polarization measurements performed by the ATLAS and CMS
collaborations. The measurements are generally in good agreement with
predictions from next-to-leading-order QCD calculations, and no deviations from
Standard Model expectations have been seen.Comment: 5 pages, 4 figures, to appear in proceedings of Top 2014, Cannes,
France, 28th Sept - 3rd Oct 201
Migration And Habitat Relationships Of Geese On The Eastern Copper River Delta, Alaska
Thesis (M.S.) University of Alaska Fairbanks, 198
Study of e/gamma trigger for the electron calibration stream
This note describes a study of the possibilities for selecting an electron
calibration stream using the High level electron trigger (Level 2 and the event
filter). Using the electromagnetic calorimeter reconstruction and the track
reconstruction algorithms, an evaluation has been performed of the selection
efficiencies and purities for different physics channels with single or double
electrons in the final state. A study of the calibration stream composition,
including the background from QCD processes, is presented.Comment: 14 page
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