In High Energy Physics (HEP) experiment, Data Quality Monitoring (DQM) system is crucial to ensure the correct and smooth operation of the experimental apparatus during data taking. DQM at Jiangmen Underground Neutrino Observatory (JUNO) will reconstruct raw data directly from JUNO Data Acquisition (DAQ) system and use event visualization tools to show the detector performance for high quality...
High-purity germanium detectors are used in the search for rare events such as neutrinoless
double-beta decay, dark matter and other beyond Standard Model physic. Due to the
infrequent occurrence of signal events, extraordinary measures are taken to reduce background
interactons and extract the most informatio from data. An efficiensignal denoising algorithm
can improve energy resolutio...
The study of Majorana neutrinos is a hot research topic in the field of particle physics for exploring physics beyond the Standard Model. Neutrinoless double beta decay (NLDBD) is a rare nuclear decay process that can confirm the Majorana nature of neutrinos experimentally. The PandaX-III collaboration aims to build a globally competitive experiment with a hundred-kilogram target mass,...
Shenzhen Innovation Light-source Facility (SILF) is a newly proposed fourth-generation synchrotron light source in China. In the first phase, a high-flux undulator beamline for high-resolution hard X-ray spectroscopy and hard X-ray photoelectron spectroscopy, named as High-Resolution Hard X-ray Spectroscopy Beamline, will be designed and constructed. This beamline is equipped with a...
Beamline Service Evaluation is a designed high energy X-ray beamline of SILF for imaging, diffraction and scattering, which will operate at energies of 30-100 keV. This beamline is designed to be suitable for experiments, which utilize: high-energy X-rays, time-resolved in situ measurements, monochromatic or polychromatic (“white beam”) X-rays imaging and diffraction techniques, including...
The invariant theory provides a systematic method to construct quantities that are invariant under group action in terms of model parameters. So far, it has a lot of applications in particle physics. In this talk, I will introduce the basic ingredients of invariant theory and Hilbert series. The application of invariant theory in neutrino physics, and particularly in describing leptonic CP...
Hyper-Kamiokande (HK) is a next-generation long-baseline neutrino experiment that aims to take data in 2027. The experiment will use the J-PARC neutrino beam, upgraded to 1.3 MW, followed by a suite of near detectors. The HK far detector is a 260 kt underground water Cherenkov detector, placed 2.5-degree off the central axis of the neutrino beam and 295 km from the target. The experiment is...
Due to finite masses and mixing, for neutrinos propagate in space-time, there is a transition between left- and right- handed neutrinos, termed chiral rotation, besides the usual oscillation governed by the Dirac equation. The probability of chiral rotation is suppressed by a factor $m^2/E^2$. For non-relativistic neutrinos, this effects can be significant. In matter, the equation of motion is...
In the early universe, Dirac neutrino magnetic moments due to their chirality-flipping nature could lead to thermal production of right-handed neutrinos, which would make a significant contribution to the effective neutrino number, Neff . In this talk, I will show that the neutrino magnetic moments above $2.7\times 10^{-12}\mu_B$ have been excluded by current CMB and BBN measurements of...
深圳产业光源增材制造线站采用波荡器（Undulator）光源，利用其高亮度、小发射度的特点获得高通量密度的同步辐射光。光源采用18mm短周期波荡器利于实现高次谐波的引出，从而覆盖8~30keV的能量波段；通过的超长线设计，以实现样品点处毫米级光斑尺寸；光束线中设置有双平晶单色器（DCM）可以提供高能量分辨的单色光，从而为高质量的定量CT测量提供可能。深圳产业光源增材制造线站高速X射线成像及CT成像为主要研究方法，将服务于粤港澳地区的增材制造相关产业中的凝固机理、成型控制、成型性能评估等基础科学及应用基础问题，助力传统制造业从低端模仿向高端创新创造转型，为其向先进制造和智能制造进行产业升级提供技术支撑。
The Jiangmen Underground Neutrino Observatory (JUNO) is a multi-purpose neutrino experiment that was proposed primarily to determine neutrino mass ordering. The center detector is a 35.4m diameter spherical acrylic vessel containing 20 kton low background Liquid Scintillator (LS). The radioactive requirements are 10-12g/g and 10-17g/g of 238U/232Th for JUNO acrylic and LS, respectively.
The...
We present a search for the lepton flavor violating decay 𝐽/𝜓→𝑒𝜇 using 8.998×10^9 𝐽/𝜓 events collected with the BESIII detector at the BEPCII 𝑒+ 𝑒− storage ring. No excess of signal above background is observed; we therefore set an upper limit on the branching fraction of ℬ(𝐽/𝜓→𝑒𝜇)< 4.5×10^(−9) at the 90% confidence level. Improving the previous best result by a factor of more than 30, this...
Charmonium weak decay is allowed in the Standard Model but has never been observed. Using (10087±44)×106 𝐽/𝜓 events collected with the BESIII detector at the BEPCII 𝑒+𝑒− storage ring at the center-of-mass energy of √𝑠=3.097 GeV, we present a search for the charmonium rare semi-muonic decay 𝐽/𝜓→𝐷−𝜇+𝜈𝜇 and its charge conjugation (c.c.) mode. Since no significant signal above the background is...
In Type-II seesaw model, an electroweak triplet scalar field $\Delta$ with a non-zero vacuum expectation value (vev) $v_\Delta$ is introduced to facilitate the generation of small neutrino masses. A non-zero $v_\Delta$ also affects the W mass through the electroweak $\rho$ parameter, making it to be less than 1 as predicted by standard model (SM). The component fields in $\Delta$ come along...
To meet the requirements of testing materials during synthesis and reactions in petrochemical industry, we provide a method by combining the XAFS and TEM to obtain the local coordination structure, chemical composition, chemical valence state, microscopic morphology of samples at the same time
