5,632 research outputs found
CP Violation in Heavy Neutrino Mediated
We consider the reaction mediated by possible
heavy neutrino exchange at future LINAC energies of . This
reaction is sensitive to CP phases of the neutrino mixing matrices, even at the
level of Born amplitudes. Certain integrated cross-sections are shown to have
the power to resolve the CP phases when the experimental configurations are
varied. Asymmetries sensitive to CP violation (involving initial QED phases)
for and reactions are constructed and their consequences
considered.Comment: 9 pages plain Latex and 4 figures available separately as uuencoded
figure
Physics with Like-Sign Muon Beams
We point out that both the specific lepton number content and the high
energies potentially attainable with muon-muon colliders make it advisable to
consider the technical feasibility of including an option of like-sign incoming
beams in the studies towards a proposal to build a muon-muon collider with
center-of-mass energies in the TeV region. This capability will add some unique
physics capabilities to the project. Special attention will have to be paid to
polarization retention for the muons.Comment: 13 pages, uuencoded postscript file, also available from
ftp://gluon.hep.physik.uni-muenchen.de/preprints/scipp9534.u
A Reproducible Study on Remote Heart Rate Measurement
This paper studies the problem of reproducible research in remote
photoplethysmography (rPPG). Most of the work published in this domain is
assessed on privately-owned databases, making it difficult to evaluate proposed
algorithms in a standard and principled manner. As a consequence, we present a
new, publicly available database containing a relatively large number of
subjects recorded under two different lighting conditions. Also, three
state-of-the-art rPPG algorithms from the literature were selected, implemented
and released as open source free software. After a thorough, unbiased
experimental evaluation in various settings, it is shown that none of the
selected algorithms is precise enough to be used in a real-world scenario
Model-Independent Limits from Electron-Electron Collisions
Model independent constraints on the mass of an extra neutral gauge boson and
its couplings to charged leptons are given for the option of a future
linear collider. Analytic exclusion limits are derived in the Born
approximation. The results are compared with those of the mode. The
influence of radiative corrections is discussed.Comment: 7 pages, LaTeX, 4 Figures, uuencoded Postscriptfile, MPI-Ph/94-23,
LMU-04/9
El cuento de senderos que se bifurcan. El Noble cuento del enperador Carlos Maynes y sus encrucijadas genéricas
Tras un breve balance del estado de la cuestión en cuanto a las fuentes del Carlos Maynes, este trabajo estudia los cambios genéricos que obran en este relato: paso de «cantar de gesta» a «cuento maravilloso», es decir a relato en prosa de aventuras caballerescas; del docere al delectare; del tema de las reinas injustamente acusadas a la problemática del buen gobierno en el espacio conflictivo de la corte. Estos cruces temáticos nuevos del Carlos Maynes abren, además, muchas puertas: nuevos grupos sociales pueden entrar a formar parte del espacio literario –con la creación de personajes como los villanos Barroquer y Griomoart–, pero también nuevos tonos y estilos como por ejemplo la mezcla de burlas y veras. Se insiste también en la posición del relato en la antologÃa escurialense. El hecho de que sea el relato con el que se cierra el códice es altamente significativo si pensamos que la obra es totalmente inaugural: es la magistral obertura, con todos sus leitmotivs, para anunciar los futuros libros de caballerÃas como el Zifar y el AmadÃs
On Possibility of Detecting the E-E- -> W-W- Process in the Standard Model
We examine the e-e- -> W-W- lepton number violating process in the frame of
the Standard Model with additional right-handed neutrino singlets. We give
results in the framework of the `see-saw' as well as other models, where there
is no relation between neutrino masses and the mixing matrix elements. The
cross section for the `see-saw' models is negligible because they predict in a
natural way very small electron-heavy neutrino mixing angles. However, there
exist other models, in which the electron-heavy neutrino mixing angles are free
parameters and can be large. Taking into account the present experimental
bounds on mixing angles the large cross section for the e-e- -> W-W- is still
acceptable.Comment: 16 pages, LATEX file and 4 tar-compressed uuencoded figure
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