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Electromagnetic form factors of Λ_c in the space-like momentum region

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Chinese Physics C 2018年第10期42卷 44-50页

作者： Liang-Liang Liu Chao Wang xin-heng guo College of Physics and Information Engineering Shanxi Normal UniversityLinfen 041004China Center for Ecological and Environmental Sciences Key Laboratory for Space Bioscience and BiotechnologyNorthwestern Polytechnical UniversityXi＇an710072China College of Nuclear Science and Technology Beijing Normal UniversityBeijing 100875China

We studied the electromagnetic form factors （EMFFs） of Ac and the contributions of the quark and diquark currents to the EMFFs of Ac in the space-like region in the Bethe-Salpeter equation approach with instantaneous approximation. In this picture, baryon Ac can be regarded as a two-body c（ud） system. We found that for different values of parameters the contribution of quark and diquark currents to the EMFFs of Ac is very different, while their total contribution to the EMFFs of Ac is similar. The EMFFs of ∧c are similar to those of other baryons （proton,≡ , and ∑＋） with a peak at ω= 1, where ω=v＇.v is the velocity transfer between the initial state （with velocity v） and the final state （with velocity vr） of Ac.

关键词： Bethe-Salpeter equation Ac baryon electromagnetic form factors quark-diquark model

Effects of a reverse shock wave on neutrino oscillations in a new supernova model

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Chinese Physics C 2018年第11期42卷 24-32页

作者： Jaing Xu Ming Lu xin-heng guo Li-Jun Hu Physics Department gantai UniversityYantai 264005China College of Nuclear Science and Techonology Beijing Normal UniversityBeijing 100875China College of Mechanical and Electrical Engineering Cangzhou Normal UniversityCangzhou 061000China

It is known that in supernova explosions, there might be a reverse shock wave in addition to the forward shock wave during the explosion phase, when the mass of supernova is in a certain range. In this paper, we propose to add the reverse shock wave to the previous supernova model, in which only the forward shock wave was included, and thus obtain a new model. By analyzing the resonance condition as well as the density jump in the new model and using the Landau-Zener method, an expression for the crossing probability in high density matter （PH） is given. We proceed to study how PH varies with time and with neutrino energy when both the reverse shock wave and the forward shock wave are considered. From comparison with the previous results, where only the effects of the forward shock wave were considered, it is clear that the reverse shock wave brings significant changes to PH.

关键词： neutrino oscillations shock wave effects crossing probability supernova models

Forward-backward asymmetries inΛ_(b)→Λl^(+)l^(-)in the Bethe-Salpeter equation approach

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Chinese Physics C 2022年第9期46卷 94-102页

作者： Liang-Liang Liu Su-Jun Cui Jing Xu xin-heng guo College of Physics and information engineering Shanxi Normal UniversityTaiyuan 030031China Department of Physics Yan-Tai UniversityYantai 264005China College of Nuclear Science and Technology Beijing Normal UniversityBeijing 100875China

Using the Bethe-Salpeter equation(BSE),we investigate the forward-backward asymmetries(AFB)inΛb→Λl^(+)l^(-)(l=e,μ,τ)in the quark-diquark *** approach provides precise form factors that are different from those of quantum chromodynamics(QCD)sum *** calculate the rare decay form factors forΛb→Λl^(+)l^(-)b and investigate the(integrated)forward-backward asymmetries in these decay *** observe the integrated A l FB,ˉA l FB(Λb→Λe^(+)e^(-)=-0.1371,ˉA l FB(Λb→Λμ^(+)μ^(-))=-0.1376,andˉA l FB(Λb→Λτ^(+)τ^(-))=-0.1053;the hadron side asymmetriesˉA h FB(Λb→Λμ^(+)μ^(-))=-0.2315;the lepton-hadron side asymmetriesˉA lh FB(Λb→Λμ^(+)μ^(-))^(-)0.0827;and the longitudinal polarization fractionsˉF L(Λb→Λμ^(+)μ^(-))^(-)0.5681.

关键词： rare decay Bethe-Salpeter equation heavy flavor physics

Direct CP violation of three body decay processes from the resonance effect

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Chinese Physics C 2022年第11期46卷 76-90页

作者： Gang Lü Yan-Lin Zhao Liang-Chen Liu xin-heng guo College of Science Henan University of TechnologyZhengzhou 450001China College of Nuclear Science and Technology Beijing Normal UniversityBeijing 100875China

The physical state of ρ−ω−φ mesons can be mixed using the unitary *** decay processes ω→π^(+)π^(−)and φ→π^(+)π^(−)originate from isospin symmetry *** ρ−ω,ρ−φ,and ω−φ interferences lead to a resonance contribution to produce strong *** violation is considered from isospin symmetry breaking due to the new strong phase of the first *** violation can be enhanced greatly for the decay process B^(0)→π^(+)π^(−)η^((′))when the invariant masses of π^(+)π^(−) pairs are in the area around the ω resonance range and φ resonance range in perturbative *** also discuss the possibility of searching for the predicted CP violation at the LHC.

关键词： CP violation B meson decay heavy flavor physics

Studying the localized CP violation and the branching fraction of the B^0→K^-π^+π^+π^-decay

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Chinese Physics C 2020年第10期44卷 51-58页

作者： Jing-Juan Qi Zhen-Yang Wang Jing Xu xin-heng guo Junior College Zhejiang Wanli UniversityZhejiang 315101China Physics Department Ningbo UniversityZhejiang 315211China Department of Physics Yantai UniversityYantai 264005China College of Nuclear Science and Technology Beijing Normal UniversityBeijing 100875China

In this work,we study the localized CP violation and the branching fraction of the four-body decay^ˉB 0→K^−π^+π^−π^+by employing a quasi-two-body QCD factorization *** the interference of^ˉB 0→ˉK^∗0(700)ρ0(770)→K^−π^+π^−π^+and^ˉB 0→ˉK∗(892)f0(500)→K^−π^+π^−π^+channels,we predict ACP(^ˉB 0→K^−π^+π^−π^+)∈[0.15,0.28]and B(^ˉB 0→K^−π^+π^−π^+)∈[1.73,5.10]×10^−7,respectively,which shows that the interference mechanism of these two channels can induce the localized CP violation to this four-body ***,within the two quark model framework for the scalar mesons f0(500)andˉK^∗0(700),we calculate the direct CP violations and branching fractions of the^ˉB 0→ˉK^∗0(700)ρ0(770)and^ˉB 0→ˉK∗(892)f0(500)decays,*** corresponding results are ACP(^ˉB 0→ˉK^∗0(700)ρ0(770))∈[0.20,0.36],ACP(^ˉB 0→ˉK∗(892)f0(500))∈[0.08,0.12],B(^ˉB 0→ˉK^∗0(700)ρ0(770)∈[6.76,18.93]×10^−8 and B(^ˉB 0→ˉK∗(892)f0(500))∈[2.66,4.80]×10^−6,indicating that the CP violations of these two-body decays are both positive and the branching fractions quite *** studies provide a new way to investigate the aforementioned four-body decay and can be helpful in clarifying the configuration of the structure of the light scalar meson.

关键词： decays of bottom mesons CP violation perturbative calculations

RareΛb→Λl+l−decay in the Bethe-Salpeter equation approach

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Chinese Physics C 2020年第8期44卷 78-87页

作者： Liang-Liang Liu Xian-Wei Kang Zhen-Yang Wang xin-heng guo College of Physics and Information Engineering Shanxi Normal UniversityLinfen 041004China Physics Department Ningbo UniversityZhejiang 315211China College of Nuclear Science and Technology Beijing Normal UniversityBeijing 100875China

We study the rare decaysΛb→Λl+l−(l=e,μ,τ)in the Bethe-Salpeter equation *** find that the branching ratio is Br(Λb→Λμ^+μ^−)×10^6=1.051∼1.098 in our *** result agrees with the experimental data *** the same parametric region,we find that the branching ratio is Br(Λb→Λe^+e^−(τ^+τ^−))×10^6=0.252∼0.392(0.286∼0.489).

关键词： charmonium decay width lattice QCD

Phenomenological studies on B^(0)→[K^(-)π^(+)]s/v[π^(+)π^(-)]v/s→K^(-)π^(+)π^(+)π^(-)decay

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Chinese Physics C 2021年第5期45卷 66-76页

作者： Jing-Juan Qi Zhen-Yang Wang Zhu-Feng Zhang xin heng guo Junior College Zhejiang Wanli UniversityZhejiang 315101China Physics Department Ningbo UniversityZhejiang 315211China College of Nuclear Science and Technology Bejing Normal UniversityBeiing 100875China

Within the quasi-two-body decay model,we study the localized CP violation and branching fraction of the four-body decay B^(0)→[K^(-)π^(+)]s/v[π^(+)π^(-)]v/s→K^(-)π^(+)π^(+)π^(-)whenthe K^(-)π^(+)andπ^(-)π^(... 详细信息

关键词： CP violation B meson QCD factorization

Impact of a_(0)^(0)(980)-f_(0)(980) mixing on the localized CP violations of the B^(-)→K^(-)π^(+)(π)^(-) decay

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Chinese Physics C 2022年第8期46卷 141-148页

作者： Jing-Juan Qi Xuan Zhang Chao Wang Zhen-Yang Wang xin-heng guo Zhejiang Wanli University Zhejiang 315101China Center for Ecological and Environmental Sciences Key Laboratory for Space Bioscience and BiotechnologyNorthwestern Polytechnical UniversityXi’an 710072China Physics Department Ningbo UniversityZhejiang 315211China College of Nuclear Science and Technology Beijing Normal UniversityBeijing 100875China

In the framework of the QCD factorization approach,we study the localized CP violations of the B^(-)→K^(-)π^(+)(π)^(-)decay with and without the a_(0)^(0)(980)-f_(0)(980) mixing mechanism and observe that the localized CP violation can be enhanced by this mixing effect when the mass of the π^(+)(π)^(-)pair is in the vicinity of the f_(0)(980) *** corresponding theoretical prediction results are A_(CP)(B^(-)→Kf_(0)→K^(-)π^(+)(π)^(-))=[0.126,0.338](0.232±0.106 with the central value form) and A_(CP)(B^(-)→K^(-)f_(0)(a_0)→K^(-)π^(+)(π)^(-))=[0.230,0.615](0.423±0.193 with the central value form),***,we also calculate the branching fraction of the B^(-)→K^(-)f_(0)(980)→K^(-)π^(+)(π)^(-)decay,which is consistent with the experimental *** suggest that the a_(0)^(0)(980)-f_(0)(980) mixing mechanism should be considered when theoretically and experimentally studying the CP violation of the B or D meson decays.

关键词： CP violation heavy quark physics B meson decay

Morphological and structural damage investigation of nanostructured molybdenum fuzzy surface after pulsed plasma bombardment

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Chinese Physics B 2022年第4期31卷 468-480页

作者： Yu-Chuan Luo Rong Yan guo Pu Hong-Bin Wang Zhi-Jun Wang Chi Yang Li Yang heng-xin guo Zhi-Bing Zhou Bo Chen Jian-Jun Chen Fu-Jun Gou Zong-Biao Ye Kun Zhang Key Laboratory of Radiation Physics and Technology of the Ministry of Education Institute of Nuclear Science and TechnologySichuan UniversityChengdu 610064China Institute of Plasma Physics Hefei Institutes of Physical ScienceChinese Academy of SciencesHefei 230031China Institute for Advanced Study Chengdu University2025 Chengluo AvenueChengdu 610106China

Steady high-flux helium(He)plasma with energy ranging from 50 eV to 90 eV is used to fabricate a fiber-form nanostructure called fuzz on a polycrystalline molybdenum(Mo)*** hydrogen(H)pulsed plasma in a wide power density range of 12 MW/m^(2)-35 MW/m^(2)is subsequently used to bombard the fuzzy Mo,thereby simulating the damage of edge localized mode(ELM)to *** comparisons of surface morphologies,crystalline structures,and optical reflectivity between the original Mo and the Mo treated with various He^(+)energy and transient power densities are *** the increase of He ion energy,the Mo nano-fuzz evolved density is enlarged due to the decrease of filament diameter and optical *** fuzz-enhanced He release should be the consequence of crystalline growth and the lattice shrinkage inside the Mo-irradiated layers(^(2)00 nm).The fuzz induced by lower energy experiences more severe melting damage and dust release under the condition of the identical transient H *** H and He are less likely to be trapped due to aggravated melting evidenced by the enhanced crystalline size and distinct lattice *** the transient power density rises,the thermal effect is enhanced,thereby causing the fuzz melting loss to aggravate and finally to completely disappear when the power density exceeds 21 MW/m^(2).Irreversible grain expansion results in huge tensile stress,leading to the observable brittle *** effects of transient thermal load and He ion energy play a crucial role in etching Mo fuzz during ELM transient events.

关键词： molybdenum nanostructured fuzz pulsed-H plasma edge localized mode etching process