CP violation effects in the diphoton spectrum of heavy scalars

Bian, Ligong,Chen, Ning,Zhang, Yongchao American Physical Society 2017 Physical Review D Vol.96 No.9

<P>In a class of new physics models, an extended Higgs sector and new CP-violating sources are simultaneously present in order to explain the baryon asymmetry in the Universe. The aim of this work is to study the implications of beyond the Standard Model (SM) CP violation for the searches of heavy scalars at the LHC. In particular, we focus on the diphoton channel searches in the CP-violating two-Higgs-doublet model (CPV 2HDM). To have a sizable CPV in the scalar sector, the two heavy neutral scalars in 2HDM tend to be nearly degenerate. The theoretical constraints of unitarity, perturbativity and vacuum stability are considered, which requires that the heavy scalars M-H less than or similar to 1 TeV in a large region of the parameter space. The experimental limits are also taken into account, including the direct searches for heavy neutral scalars in the final state of the SM h, W and Z bosons; the differential (tt) over bar data; those from the charged scalar sector which is implied by the oblique T parameter; and the precise measurements of the electric dipole moments of electrons and mercury. The quantum interference effects between the resonances and the SM background are crucially important for the diphoton signals, and the CPV mixing of the quasidegenerate heavy scalars could enhance significantly the resonance peak. With an integrated luminosity of 3000 fb(-1) at the LHC, almost the whole parameter space of CPV 2HDM could be probed in the diphoton channel, and the CPV could also be directly detected via the diphoton spectrum.</P>

Speed Sensorless Control of a Bearingless Induction Motor Based on Modified Robust Kalman Filter

Bian Yifan,Yang Zebin,Sun Xiaodong,Wang Xiang 대한전기학회 2024 Journal of Electrical Engineering & Technology Vol.19 No.3

To enhance the speed identifcation accuracy in speed sensorless control of a bearingless induction motor (BIM), a speed sensorless control strategy based on modifed robust Kalman flter is proposed. Firstly, the suboptimal principle of the H∞ control method is introduced into the extended Kalman flter to construct the robust Kalman flter. Secondly, the rotor fux linkage of the BIM in the α-β coordinate system is discretized, which is used as a reference model and adjustable model in the model reference adaptive system. At the same time, the modifed robust Kalman flter is obtained by combining the robust Kalman flter with the model reference adaptive system. Finally, the simulation and experimental results show that the proposed BIM speed sensorless control system based on modifed robust Kalman flter has higher accuracy of speed identifcation than the extended Kalman flter control under diferent operation conditions of no-load, sudden load, speed change, and motor parameter mismatch. The motor also has a good suspension performance.

Effect of SnO₂ addition on the magnetic, transport and magnetoresistance properties of La_0.7(Ca_<i>x</i>Sr_1–<i>x</i>)_0.3MnO₃

Bian, Jin Long,Seo, Yong Jun,Kim, Geun Woo,Sung, Chang Hoon,Kumar, Shalendra,Lee, Chan Gyu,Koo, Bon Heun Elsevier 2011 CURRENT APPLIED PHYSICS Vol.11 No.1

<P><B>Abstract</B></P><P>Composites of 0.99La<SUB>0.7</SUB>(Ca<SUB><I>x</I></SUB>Sr<SUB>1–<I>x</I></SUB>)<SUB>0.3</SUB>MnO<SUB>3</SUB>/0.01SnO<SUB>2</SUB> (LCSMO/SnO<SUB>2</SUB>) (<I>x</I> = 0, 0.1, 0.2, 0.5, 0.7 and 1) were synthesized using solid-state reaction technique, and then characterized using the X-ray diffraction (XRD) and scanning electron microscopy (SEM). The XRD and SEM observations show the LCSMO and SnO<SUB>2</SUB> phases are separately distributed in the composites which indicate that there was no chemical interaction occurred during the sintering process. SnO<SUB>2</SUB> is mainly distributed at the grain boundaries and surfaces of the matrix. The resistivity of the composites was measured in the range of 100–350 K by using physical properties measurement system (PPMS). The applied magnetic field is 0T, 0.5T and 1T. Enhanced magnetoresistance (MR) within a wide temperature range was obtained. The observed variation of MR with varying Ca and Sr concentration has been qualitatively investigated.</P> <P><B>Highlights</B></P><P>► Low field magnetoresistance has potential application in highspeed electronic, magnetic and recording devices, etc. ► SnO<SUB>2</SUB> influence the electric and magnetic properties of the manganites composites. ► Enhanced room temperature magnetoresistance at low magnetic field.</P>

Impaired Opening of the Upper Esophageal Sphincter in Patients with Medullary Infarctions

Bian, Ren-Xiu,Choi, In-Sung,Kim, Jae-Hyung,Han, Jae-Young,Lee, Sam-Gyu Springer-Verlag 2009 Dysphagia Vol.24 No.2

Immunomodulatory Biomaterials and Emerging Analytical Techniques for Probing the Immune Micro-Environment

Bian Nanyan,Chu Chenyu,Rung Shengan,Huangphattarakul Vicha,Huangphattarakul Vicha,Huangphattarakul Vicha,Hu Chen 한국조직공학과 재생의학회 2023 조직공학과 재생의학 Vol.20 No.1

After implantation of a biomaterial, both the host immune system and properties of the material determine the local immune response. Through triggering or modulating the local immune response, materials can be designed towards a desired direction of promoting tissue repair or regeneration. High-throughput sequencing technologies such as single-cell RNA sequencing (scRNA-seq) emerging as a powerful tool for dissecting the immune micro-environment around biomaterials, have not been fully utilized in the field of soft tissue regeneration. In this review, we first discussed the procedures of foreign body reaction in brief. Then, we summarized the influences that physical and chemical modulation of biomaterials have on cell behaviors in the micro-environment. Finally, we discussed the application of scRNA-seq in probing the scaffold immune micro-environment and provided some reference to designing immunomodulatory biomaterials. The foreign body response consists of a series of biological reactions. Immunomodulatory materials regulate immune cell activation and polarization, mediate divergent local immune micro-environments and possess different tissue engineering functions. The manipulation of physical and chemical properties of scaffolds can modulate local immune responses, resulting in different outcomes of fibrosis or tissue regeneration. With the advancement of technology, emerging techniques such as scRNA-seq provide an unprecedented understanding of immune cell heterogeneity and plasticity in a scaffold-induced immune micro-environment at high resolution. The in-depth understanding of the interaction between scaffolds and the host immune system helps to provide clues for the design of biomaterials to optimize regeneration and promote a pro-regenerative local immune micro-environment.

Study on synthesis and thermal insulation properties of polyurethane foams prepared with expandable microspheres

Bian Yu,권영환,김진석 한국고분자학회 2014 한국고분자학회 학술대회 연구논문 초록집 Vol.2014 No.10

Bending and free vibration analysis of a smart functionally graded plate

Bian, Z.G.,Ying, J.,Chen, W.Q.,Ding, H.J. Techno-Press 2006 Structural Engineering and Mechanics, An Int'l Jou Vol.23 No.1

A simply supported hybrid plate consisting of top and bottom functionally graded elastic layers and an intermediate actuating or sensing homogeneous piezoelectric layer is investigated by an elasticity (piezoelasticity) method, which is based on state space formulations. The general spring layer model is adopted to consider the effect of bonding adhesives between the piezoelectric layer and the two functionally graded ones. The two functionally graded layers are inhomogeneous along the thickness direction, which are approached by laminate models. The effect of interlaminar bonding imperfections on the static bending and free vibration of the smart plate is discussed in the numerical examples.

Flavor and CP-violating Higgs sector in two Higgs doublet models with U(1)'

Bian Ligong,Lee Hyun Min,Park Chan Beom 한국물리학회 2021 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.79 No.2

We investigate the role of a local U(1)' symmetry for the problem of CP violation in the effective theory for two Higgs doublet models and its microscopic counterparts. First, in the two Higgs doublet models with U(1)' , we show that the higherdimensional operators in the scalar potential violate the CP symmetry with an interplay with the mixing mass parameter, giving rise to small mixings between CP-even and CP-odd scalars. Motivated by the B-meson anomalies in recent years, we take the flavored U(1)' to be a benchmark model for specifying the flavor structure. Then, we calculate the electric dipole moment of the electron (eEDM) at two loops due to the CP-violating higher-dimensional operators and identify the correlation between the masses of heavy Higgs bosons and the cutoff scale from the bound on the eEDM. We also comment on the possibility of making an independent test of the CP violation in collider searches for heavy Higgs bosons. Finally, we show how the obtained eEDM results in the effective theory can be used to constrain microscopic models with an explicit CP violation in partially decoupled or dark sectors.

Minimal flavored U(1)′ for B -meson anomalies

Bian, Ligong,Choi, Soo-Min,Kang, Yoo-Jin,Lee, Hyun Min American Physical Society 2017 Physical Review D Vol.96 No.7

<P>We consider an anomaly free U(1)' model with favorable couplings to heavy flavors in the Standard Model ( SM), as motivated by B- meson anomalies at LHCb. Taking the U(1)' charge to be Q' = y(L mu - L tau) + x(B-3 - L-3), we can explain theB- meson anomalies without invoking extra charged fermions or flavor violation beyond the SM. We showthat there is a viable parameter space with a small x that is compatible with other meson decays, tau lepton, and neutrino experiments as well as theLHCdimuon searches. We briefly discuss the prospects of discovering the Z' gauge boson at the LHC in the proposed model.</P>

Penrose s ladder of more governance, more governance

Bian Yuandihan,Wang Tengfei 아시아사회과학학회 2021 Jornal of Asia Social Science Vol.4 No.3

The purpose of this paper is to explain the reasons why overload and overrun can t be cured repeatedly, which is the premise of effective overload control. At the shallow level, this is a law enforcement problem. The level of law enforcement involves many factors, such as insufficient law enforcement resources, fragmented law enforcement governance, weakening law enforcement perception, power rent-seeking and so on. Legislative level, there are some challenges whether the overly technical legislative construction can be completed by law enforcement departments. On the aspect of law-abiding, the law-abiding behavior of law-abiding people will have adverse effects on them, which is contrary to the assumption of rational people. At the deep level, there are some fundamental dynamic mechanisms in Shuangchao.This includes, but is not limited to, the inertia of overloaded culture in local society, the demand of huge infrastructure for heavy-duty transportation, the pursuit of economic efficiency by Chinese speed, and the differences between central and local economic protection.