1,545 research outputs found
NLO Productions of and with a Global Extraction of the Jet Transport Parameter in Heavy Ion collisions
In this work, we pave the way to calculate the productions of and
mesons at large in p+p and A+A collisions at the RHIC and
the LHC. The meson fragmentation functions (FFs) in vacuum at
next-to-leading order (NLO) are obtained by evolving NLO DGLAP evolution
equations with rescaled FFs at initial scale GeV from
a broken SU(3) model, and the FFs in vacuum are taken from AKK08
parametrization directly. Within the framework of the NLO pQCD improved parton
model, we make good descriptions of the experimental data on and
in p+p both at the RHIC and the LHC. With the higher-twist
approach to take into account the jet quenching effect by medium modified FFs,
the nuclear modification factors for meson and meson at
the RHIC and the LHC are presented with different sets of jet transport
coefficient . Then we make a global extraction of at the
RHIC and the LHC by confronting our model calculations with all available data
on 6 identified mesons: , , , , , and
. The minimum value of the total for productions of
these mesons gives the best value of for Au+Au
collisions with GeV at the RHIC, and for Pb+Pb collisions with TeV at the LHC
respectively, with the QGP spacetime evolution given by an event-by-event
viscous hydrodynamics model IEBE-VISHNU. With these global extracted values of
, the nuclear modification factors of , , ,
, , and in A+A collisions are presented, and
predictions of yield ratios such as and at
large in heavy-ion collisions at the RHIC and the LHC are provided.Comment: 9 pages, 13 figures, 1 tabl
Muon mass correction in partial wave analyses of charmed meson semi-leptonic decays
We derive the parameterization formula for partial wave analyses of charmed
meson semi-leptonic decays with consideration of the effects caused by the
lepton mass. As the proposed super-tau-charm factory will reach much enhanced
luminosity and BESIII is taking data, our results are
helpful to improve the measurement precision of future partial wave analyses of
charmed meson semi-muonic decays
Enhancement of baryon-to-meson ratios around jets as a signature of medium response
We present a unique signal of jet-induced medium excitations: the enhancement
of baryon-to-meson ratios around the quenched jets. To illustrate this, we
study jet-particle correlations and the distributions of jet-induced identified
particles with respect to the jet direction in Pb+Pb collisions at the LHC via
a multi-phase transport model. We find a strong enhancement of baryon-to-meson
ratios for associated particles at intermediate transverse momentum around the
triggered jets in Pb+Pb collisions relative to p+p collisions, due to the
coalescence of jet-excited medium partons. Since the lost energy from jets can
diffuse to large angles, such baryon-to-meson-ratio enhancement is more
pronounced for larger relative distance from the jet axis. We argue that the
experimental confirmation of the enhancement of jet-induced baryon-to-meson
ratios around the jets will provide an unambiguous evidence for the medium
response to jet quenching in heavy-ion collisions.Comment: 6 pages, 3 figure
Photo-production of lowest state within the Regge-effective Lagrangian approach
Since the lowest state, with quantum numbers spin-parity , is far from established experimentally and theoretically, we have
performed a theoretical study on the photo-production within
the Regge-effective Lagrangian approach. Taking into account that the
couples to the channel, we have considered the
contributions from the -channel exchange diagram. Moreover, these
contributions from -channel exchange, -channel nucleon pole,
-channel exchange, and the contact term, are considered. The
differential and total cross sections of the process are predicted with our model parameters. The results
should be helpful to search for the state experimentally in
future.Comment: 7 pages, 4 figure
Non-volatile memory based on PZT/FeGa thin film memtranstor
The PZT/FeGa thin film memtranstor was prepared and the modulation of the
magnetoelectric coefficient by external magnetic and electric fields was
studied. The magnetoelectric coefficient of the PZT/FeGa memtranstor can be
reversed by flipping the direction of magnetization of FeGa or ferroelectric
polarization of PZT. Notably, the sign of the magnetoelectric coefficient can
be switched repeatedly by reversing ferroelectric polarization of PZT when the
external magnetic field remains constant. Moreover, the binary switching
behavior can still be maintained under zero DC bias magnetic field. When the
polarization direction remains stable, the magnetoelectric coefficient also
does not change. This means that the magnetoelectric coefficient of PZT/FeGa is
non-volatile. Furthermore, the retention and endurance characteristics of the
PZT/FeGa thin film memtranstor have been investigated. These findings
demonstrate the potential of the PZT/FeGa thin film memtranstor for
non-volatile memory applications.Comment: 10 pages, 4 figure
Scalable Incomplete Multi-View Clustering with Structure Alignment
The success of existing multi-view clustering (MVC) relies on the assumption
that all views are complete. However, samples are usually partially available
due to data corruption or sensor malfunction, which raises the research of
incomplete multi-view clustering (IMVC). Although several anchor-based IMVC
methods have been proposed to process the large-scale incomplete data, they
still suffer from the following drawbacks: i) Most existing approaches neglect
the inter-view discrepancy and enforce cross-view representation to be
consistent, which would corrupt the representation capability of the model; ii)
Due to the samples disparity between different views, the learned anchor might
be misaligned, which we referred as the Anchor-Unaligned Problem for Incomplete
data (AUP-ID). Such the AUP-ID would cause inaccurate graph fusion and degrades
clustering performance. To tackle these issues, we propose a novel incomplete
anchor graph learning framework termed Scalable Incomplete Multi-View
Clustering with Structure Alignment (SIMVC-SA). Specially, we construct the
view-specific anchor graph to capture the complementary information from
different views. In order to solve the AUP-ID, we propose a novel structure
alignment module to refine the cross-view anchor correspondence. Meanwhile, the
anchor graph construction and alignment are jointly optimized in our unified
framework to enhance clustering quality. Through anchor graph construction
instead of full graphs, the time and space complexity of the proposed SIMVC-SA
is proven to be linearly correlated with the number of samples. Extensive
experiments on seven incomplete benchmark datasets demonstrate the
effectiveness and efficiency of our proposed method. Our code is publicly
available at https://github.com/wy1019/SIMVC-SA
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