379 research outputs found
Charmless hadronic decays in the Topcolor-assisted Technicolor model
Based on the effective Hamiltonian with the generalized factorization
approach, we calculate the branching ratios and CP asymmetries of
decays in the Topcolor-assisted Technicolor (TC2) model. Within the considered
parameter space we find that: (a) for the penguin-dominated
and decays, the new physics enhancements to the branching ratios
are around 40%; (b) the measured branching ratios of and decays prefer the range of 3 \lesssim \nceff \lesssim 5; (c) the
SM and TC2 model predictions for the branching ratio are only about half of the Belle's measurement; and (d) for most decays, the new physics corrections on their CP asymmetries are
generally small or moderate in magnitude and insensitive to the variation of
\mpcc and \nceff.Comment: 16 pages, Revtex, 4 EPS figure
Charmless decays B -> PP, PV, and effects of new strong and electroweak penguins in Topcolor-assisted Technicolor model
Based on the low energy effective Hamiltonian with generalized factorization,
we calculate the new physics contributions to the branching ratios and
CP-violating asymmetries of the two-body charmless hadronic decays from the new strong and electroweak penguin diagrams in the TC2 model. The
top-pion penguins dominate the new physics corrections, and both new gluonic
and electroweak penguins contribute effectively to most decay modes. For
tree-dominated decay modes the new physics
corrections are less than 10%. For decays , ,
, the new physics enhancements can be rather large (from to ) and are insensitive to the variations of , , and
within the reasonable ranges. For decays ,
, and , is
strongly dependent: varying from -90% to in the range
of . The new physics corrections to the CP-violating
asymmetries vary greatly for different B decay channels. For
five measured CP asymmetries of decays,
is only about 20% and will be masked by large
theoretical uncertainties. The new physics enhancements to interesting decays are significant in size (), insensitive to the
variations of input parameters and hence lead to a plausible interpretation for
the unexpectedly large decay rates. The TC2 model predictions
for branching ratios and CP-violating asymmteries of all fifty seven decay modes are consistent with the available data within one or two
standard deviations.Comment: Latex file, 56 pages with 11 ps and eps figures. to be published in
Eur.Phys.J.
Electroweak Penguin Contributions in and decays Beyond Leading Logarithms
Using the next-to-leading order low energy effective Hamiltonian for , transitions, the contributions of electroweak
penguin operators in and decays
are estimated in the standard model. We find that, for some channels, the
electroweak penguin effects can enhance or reduce the QCD penguin and/or tree
level contributions by at least , and can even play dominant role.Comment: 12 pages, late
Decays in the Perturbative QCD Approach
We calculate the branching ratios and CP-violating asymmetries for B^0 \to
K^{0} \ov K^{*0}, \ov K^{0} K^{*0}, , , and B^+\to
K^+ \ov K^{*0} and \ov K^0 K^{*+} decays by employing the low energy
effective Hamiltonian and the perturbative QCD (pQCD) factorization approach.
The theoretical predictions for the branching ratios are Br(B^0/\ov B^0 \to
K^{\pm} K^{*\mp}) \approx 7.4 \times 10^{-8}, Br(B^0/\ov B^0 \to K^{0} \ov
K^{*0}(\ov K^{0} K^{*0})) \approx 19.6 \times 10^{-7}, Br(B^+\to K^+ \ov
K^{*0}) \approx 3 \times 10^{-7} and Br(B^+\to K^{*+} \ov K^0) \approx 18.3
\times 10^{-7}, which are consistent with currently available experimental
upper limits. We also predict large CP-violating asymmetries in these decays:
A_{CP}^{dir}(K^\pm \ov K^{*0})\approx -20 %, A_{CP}^{dir}(K^{*\pm} \ov
K^0)\approx -49%, which can be tested by the forthcoming B meson experiments.Comment: 25 pages, 7 figures, RevTex, some corrections on the numerical
results and contents, typos removed, new references adde
Simplified Neutrosophic Sets Based on Interval Dependent Degree for Multi-Criteria Group Decision-Making Problems
In this paper, a new approach and framework based on the interval dependent degree for multi-criteria group decision-making (MCGDM) problems with simplified neutrosophic sets (SNSs) is proposed. Firstly, the simplified dependent function and distribution function are defined. Then, they are integrated into the interval dependent function which contains interval computing and distribution information of the intervals
Strong decays of D 3 ∗ ( 2760 ) , D s 3 ∗ ( 2860 ) , B 3 ∗ , and B s 3 ∗
In this paper, we study the OZI-allowed two-body strong decays of heavy–light mesons. Experimentally the charmed and the charm–strange states with these quantum numbers have been discovered. For the bottomed B(5970) state, which was found by the CDF Collaboration recently, its quantum number has not been decided yet and we assume it is a meson in this paper. The theoretical prediction for the strong decays of bottom–strange state is also given. The relativistic wave functions of heavy mesons are constructed and their numerical values are obtained by solving the corresponding Bethe–Salpeter equation with instantaneous approximation. The transition matrix is calculated by using the PCAC and low energy theorem, following which the decay widths are obtained. For and , the total strong decay widths are 72.6 and 47.6 MeV, respectively. For with MeV and with MeV, their strong decay widths are 22.9 and 40.8 MeV, respectively
Effect of space flight factors on alfalfa seeds
To explore the effect of space flight factors on the early development of alfalfa seedling, dry seeds were placed onboard a satellite for a 15-day flight. After retrieval, the ultra structure of seed coat and the chemical content of seed were tested, followed by tests for germinate ability, seedling growth, and mitotic and chromosome aberrations. Results showed that space flight factors have both positive and negative effects on alfalfa seeds. Positive effects include: (1) A 6.2% increase in germinate potential and (2) an 80% decrease in the number of hard seed in flight seeds. Meanwhile, negative effects included a decrease of 3.0 and 33.2% in the index of germination and vigor of flight seeds, respectively, which may be partly due to the inhibition of cell mitotic (26% less than ground control) and root growth (29.0% less than ground control) after the space flight. Moreover, the DNA and Ca2+ content of alfalfa seeds increased after the space flight, while the reserve energy content of alfalfa seeds, such as saccharine and fatty acid, decreased after the space flight. Conclusively, space flight factors accelerate the germination process of alfalfa seeds but restrain the root from growing due to chromosomal damage and abnormal mitosis induced by cosmic radiation.Key words: Alfalfa, space flight factors, germination, chromosome aberration
Expert consensus on the management of adverse events in patients receiving targeted agents for advanced thyroid cancer (2023 edition)
Recently, targeted therapy has become the standard of care for advanced thyroid cancer. Although expert consensus on the management of adverse events in patients receiving targeted agents for radioactive iodine-refractory differentiated thyroid cancer (RAIR-DTC) was formulated by Thyroid Cancer Committee of Chinese Society of Clinical Oncology in 2018, the tumor types which are eligible for targeted therapy have been extended to medullary thyroid cancer (MTC) and anaplastic thyroid cancer (ATC), and targeted agents have been approved from multikinase inhibitors (MKIs) to BRAF inhibitors, MEK inhibitors, RET inhibitors and TRK inhibitors. Along with the widely used targeted agents with different mechanism, the management of adverse events for targeted agents needs to be standardized and improved, especially considering the specialties of the physicians who are involved in the targeted therapy for thyroid cancer are variable. Therefore, Thyroid Cancer Committee of Chinese Society of Clinical Oncology convened an expert task force charged with developing consensus to serves as a guidance to standardize utilization of targeted agents and to optimize clinical practice
Unsupervised domain adaptation semantic segmentation of high-resolution remote sensing imagery with invariant domain-level prototype memory
Semantic segmentation is a key technique involved in automatic interpretation
of high-resolution remote sensing (HRS) imagery and has drawn much attention in
the remote sensing community. Deep convolutional neural networks (DCNNs) have
been successfully applied to the HRS imagery semantic segmentation task due to
their hierarchical representation ability. However, the heavy dependency on a
large number of training data with dense annotation and the sensitiveness to
the variation of data distribution severely restrict the potential application
of DCNNs for the semantic segmentation of HRS imagery. This study proposes a
novel unsupervised domain adaptation semantic segmentation network
(MemoryAdaptNet) for the semantic segmentation of HRS imagery. MemoryAdaptNet
constructs an output space adversarial learning scheme to bridge the domain
distribution discrepancy between source domain and target domain and to narrow
the influence of domain shift. Specifically, we embed an invariant feature
memory module to store invariant domain-level context information because the
features obtained from adversarial learning only tend to represent the variant
feature of current limited inputs. This module is integrated by a category
attention-driven invariant domain-level context aggregation module to current
pseudo invariant feature for further augmenting the pixel representations. An
entropy-based pseudo label filtering strategy is used to update the memory
module with high-confident pseudo invariant feature of current target images.
Extensive experiments under three cross-domain tasks indicate that our proposed
MemoryAdaptNet is remarkably superior to the state-of-the-art methods.Comment: 17 pages, 12 figures and 8 table
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