171,807 research outputs found
Summary Talk: First Workshop on Forward Physics and Luminosity Determination at the LHC
An attempt is made to summarize the discussion at the Workshop, except for
the panel discussion on the ability of the LHC detectors to accommodate forward
reactions. The Workshop focused on two main topics. The first topic was forward
physics at the LHC. Predictions were made for forward reactions, including
elastic scattering and soft diffractive processes, intopic was forward physics
at the LHC. Predictions were made for forward reactions, including elastic
scattering and soft diffractive processes, in terms of (multi) Pomeron
exchange, using knowledge gained at lower energies. The survival probability of
rapidity gaps accompanying hard subprocesses was studied. The nature of the
Pomeron, before and after QCD, was exposed, and some aspects of small x physics
at the LHC were considered. The second topic of the Workshop concerned the
accuracy of the luminosity measuring processes at the LHC. Attention
concentrated on three methods. The classic approach based on the optical
theorem, secondly, the observation of the pure QED process of lepton-pair
(l^+l^-) production by photon-photon fusion and, finally, the measurement of
inclusive W and Z production.Comment: 21 pages,10 figures, LaTeX, Workshop at Helsinki, 31 October - 3
November, 200
Status of Structure Functions and Partons
We briefly review some of the developments in the study of parton
distributions which have occurred since DIS2000, including discussion of
uncertainties, shadowing, unintegrated and generalized distributions.Comment: 12 pages including 4 figures, summary of talk at DIS200
Automated weighing by sequential inference in dynamic environments
We demonstrate sequential mass inference of a suspended bag of milk powder
from simulated measurements of the vertical force component at the pivot while
the bag is being filled. We compare the predictions of various sequential
inference methods both with and without a physics model to capture the system
dynamics. We find that non-augmented and augmented-state unscented Kalman
filters (UKFs) in conjunction with a physics model of a pendulum of varying
mass and length provide rapid and accurate predictions of the milk powder mass
as a function of time. The UKFs outperform the other method tested - a particle
filter. Moreover, inference methods which incorporate a physics model
outperform equivalent algorithms which do not.Comment: 5 pages, 7 figures. Copyright IEEE (2015
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