10,159 research outputs found
Rare Decays
Studies of rare decays play an important role in the search of physics beyond
the standard model. New particles may participate in the loop processes and can
be probed by seeing any deviations from the standard model predictions. The
very rare decay has been observed with the data collected by
CMS and LHCb experiments. The signal seen by the ATLAS experiment is less
significant but is compatible with the predictions. The measurement itself
provides stringent constraints to new physics models. The first effective
lifetime measurement with candidates has been carried out by
the LHCb experiment. More data are still required to observe the
decays. The decay also proceeds through
a flavour changing neutral current process, and is sensitive to the new
physics. Extended measurements are carried out for decays.
Most of the classical physics parameters are found to be consistent with the
predictions, but tensions do emerge in some of the observables. More data will
help to clarify these potential deviations.Comment: 7 pages, for LHCP 2017 conferenc
Anisotropic distributions in a multi-phase transport model
With A Multi-Phase Transport (AMPT) model we investigate the relation between
the magnitude, fluctuations and correlations of the initial state spatial
anisotropy and the final state anisotropic flow coefficients
in Au+Au collisions at 200 GeV. It is found
that the relative eccentricity fluctuations in AMPT account for the observed
elliptic flow fluctuations, in agreement with measurements of the STAR
collaboration. In addition, the studies based on 2- and multi-particle
correlations and event-by-event distributions of the anisotropies suggest that
the Elliptic-Power function is a promising candidate of the underlying
probability density function of the event-by-event distributions of
as well as . Furthermore, the correlations between
different order symmetry planes and harmonics in the initial coordinate space
and final state momentum space are presented. Non-zero values of these
correlations have been observed. The comparison between our calculations and
data will, in the future, shed new insight into the nature of the fluctuations
of the Quark-Gluon Plasma produced in heavy ion collisions.Comment: 10 pages, 8 figures, accepted by PR
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Volume Modeling for Rapid Prototyping
The expanding workspace of Rapid Prototyping will draw on the new developments
in geometric modeling. Volume modeling has substantial advantages over other modeling
schemes to meet the emerging requirements of Rapid Prototyping technology. It provides us with
a new approach to design complex geometry and topology. The integration of the volume
modeling and Rapid Prototyping technology will help us to fully exploit RP's ability to fabricate
objects with complex structures. This paper addresses our research and practice in a volume
modeling system toward Rapid Prototyping. Novel techniques in volumetric data manipulation,
NURBS volume models and triangular facet generation over solid models are presented.
Computer models designed by this system and their corresponding DTM products are also
shown atthe end of this paper.Mechanical Engineerin
Half-life Expectations for Neutrinoless Double Beta Decay in Standard and Non-Standard Scenarios
We investigate the half-life expectations for neutrinoless double beta decay
by applying statistical distributions of neutrino mixing observables, neutrino
mass constraints from cosmology and nuclear matrix elements. The analysis is
performed in the standard scenario of active Majorana neutrino exchange, when
light sterile neutrinos are added, and within TeV-scale left-right symmetric
frameworks. The latter two cases correspond to a modified phenomenology of
double beta decay for a normal and inverted mass ordering, and thus different
discovery potential for future experiments.Comment: 18 pages, 10 figures, and 4 table
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