5,179 research outputs found
Charmless Decays in Factorization-Assisted Topological-Amplitude Approach
Within the factorization-assisted topological-amplitude approach, we studied
the 33 charmless decays, where stands for a light vector
meson. According to the flavor flows, the amplitude of each process can be
decomposed into 8 different topologies. In contrast to the conventional flavor
diagrammatic approach, we further factorize each topological amplitude into
decay constant, form factors and unknown universal parameters. By
fitting 46 experimental observables, we extracted 10 theoretical parameters
with per degree of freedom around 2. Using the fitted parameters, we
calculated the branching fractions, polarization fractions, CP asymmetries and
relative phases between polarization amplitudes of each decay mode. The decay
channels dominated by tree diagram have large branching fractions and large
longitudinal polarization fraction. The branching fractions and longitudinal
polarization fractions of color-suppressed decays become smaller. Current
experimental data of large transverse polarization fractions in the penguin
dominant decay channels can be explained by only one transverse amplitude of
penguin annihilation diagram. Our predictions of those not yet measured
channels can be tested in the ongoing LHCb experiment and the Belle-II
experiment in future.Comment: 22 pages, 2 figure
Direct CP violation in
We study the direct CP violation in the decay process in the
Standard Model. An interesting mechanism involving the charge symmetry
violating mixing between and is applied to enlarge the CP
asymmetry. With this mechanism, the maximum differential and localized
integrated CP asymmetries can reach and
, respectively, which still leave plenty room
for CP-violating New Physics to be discovered through this process
B-meson Semi-inclusive Decay to Charmonium in NRQCD and X(3872)
The semi-inclusive B-meson decay into spin-singlet D-wave
charmonium, , is studied in nonrelativistic QCD (NRQCD). Both
color-singlet and color-octet contributions are calculated at next-to-leading
order (NLO) in the strong coupling constant . The non-perturbative
long-distance matrix elements are evaluated using operator evolution equations.
It is found that the color-singlet contribution is tiny, while the
color-octet channels make dominant contributions. The estimated branching ratio
is about in the Naive Dimensional
Regularization (NDR) scheme and in the t'Hooft-Veltman
(HV) scheme, with renormalization scale \,GeV. The
scheme-sensitivity of these numerical results is due to cancelation between
and contributions. The -dependence curves
of NLO branching ratios in both schemes are also shown, with varying from
to and the NRQCD factorization or renormalization scale
taken to be . Comparison of the estimated branching ratio
of with the observed branching ratio of
may lead to the conclusion that X(3872) is unlikely to be the
charmonium state .Comment: Version published in PRD, references added, 26 pages, 9 figure
Discussion on surgical treatment for young patients with congenital lower eyelid entropion
AIM: To explore the surgical methods and clinical effects on young patients with congenital lower eyelid entropion. <p>METHODS: There were 27 patients(45 cases)who suffered congenital lower eyelid entropion accepted the modified blepharosphincterectomy. The clinical effects and complications were evaluated.<p>RESULTS: After followed up for 6mo, 42 eyes were fully recovered, 3 eyes were unsuccessful and the cure rate was 93%, 5 eyes suffered minor lower eyelid skin folds, none had lower eyelid retraction and ectropion.<p>CONCLUSION: Modified blepharosphincterectomy is an ideal cosmetic surgical treatment for young patients with congenital lower eyelid entropion. It is an effective surgical treatment with fewer complications
Constructing Confidence Intervals for Effect Sizes in ANOVA Designs
A confidence interval for effect sizes provides a range of plausible population effect sizes (ES) that are consistent with data. This article defines an ES as a standardized linear contrast of means. The noncentral method, Bonett’s method, and the bias-corrected and accelerated bootstrap method are illustrated for constructing the confidence interval for such an effect size. Results obtained from the three methods are discussed and interpretations of results are offered
Handling Missing Data in Single-Case Studies
Multiple imputation is illustrated for dealing with missing data in a published SCED study. Results were compared to those obtained from available data. Merits and issues of implementation are discussed. Recommendations are offered on primal/advanced readings, statistical software, and future research
- …