3 research outputs found
Matter Effects of Sterile Neutrino in Light of Renormalization-Group Equations
The renormalization-group equation (RGE) approach to neutrino matter effects
is further developed in this work. We derive a complete set of differential
equations for effective mixing elements, masses and Jarlskog-like invariants in
presence of a light sterile neutrino. The evolutions of mixing elements as well
as Jarlskog-like invariants are obtained by numerically solving these
differential equations. We calculate terrestrial matter effects in
long-baseline (LBL) experiments, taking NOvA, T2K and DUNE as examples. In both
three-flavor and four-flavor frameworks, electron-neutrino survival
probabilities as well as the day-night asymmetry of solar neutrino are also
evaluated as a further examination of the RGE approach.Comment: 18 pages, 3 figures, 1 table; 22 pages, the version accepted by JHE
Doubly charmed baryon decays in the quark model
In this work we study the doubly charmed baryon decays
within the framework of the
non-relativistic quark model (NRQM). Factorizable amplitudes are expressed in
terms of transition form factors, while nonfactorizable amplitudes arising form
the inner -emission are evaluated using current algebra and the pole model
and expressed in terms of baryonic matrix elements and axial-vector form
factors. Nonperturbative parameters are then calculated using the NRQM. They
can be expressed in terms of the momentum integrals of baryon wave functions,
which are in turn expressed in terms of the harmonic oscillator parameters
and for - and -mode excitation.
The measured ratio of the branching fraction of relative to can be
accommodated in the NRQM with and being in
the vicinity of 0.51 and 0.19, respectively, where is the
parameter for and for
. Decay asymmetries are predicted to be and
for and modes, respectively,
which can be tested in the near future. We compare our results with other works
and point out that although some other models can accommodate the ratio ,
they tend to lead to a branching fraction of
too large compared to that inferred from the LHCb measurement of its rate
relative to .Comment: 17 pages, 2 figure
Whole Genome Sequencing in the Evaluation of Fetal Structural Anomalies: A Parallel Test with Chromosomal Microarray Plus Whole Exome Sequencing
Whole genome sequencing (WGS) is a powerful tool for postnatal genetic diagnosis, but relevant clinical studies in the field of prenatal diagnosis are limited. The present study aimed to prospectively evaluate the utility of WGS compared with chromosomal microarray (CMA) and whole exome sequencing (WES) in the prenatal diagnosis of fetal structural anomalies. We performed trio WGS (β40-fold) in parallel with CMA in 111 fetuses with structural or growth anomalies, and sequentially performed WES when CMA was negative (CMA plus WES). In comparison, WGS not only detected all pathogenic genetic variants in 22 diagnosed cases identified by CMA plus WES, yielding a diagnostic rate of 19.8% (22/110), but also provided additional and clinically significant information, including a case of balanced translocations and a case of intrauterine infection, which might not be detectable by CMA or WES. WGS also required less DNA (100 ng) as input and could provide a rapid turnaround time (TAT, 18 Β± 6 days) compared with that (31 Β± 8 days) of the CMA plus WES. Our results showed that WGS provided more comprehensive and precise genetic information with a rapid TAT and less DNA required than CMA plus WES, which enables it as an alternative prenatal diagnosis test for fetal structural anomalies