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一个绳杆复合摆问题的简单研究
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作者 朱经亚 《物理与工程》 2018年第6期26-31,52,共7页
把单摆中的质点换成匀质刚体杆,即构成了一个绳杆复合摆。文章从全国中学生物理奥林匹克竞赛中的一道题目出发,研究了绳杆复合摆问题,简要阐述了从牛顿定律、守恒定律、拉格朗日力学、哈密顿力学等不同途径解决该问题的多种方法,重点是... 把单摆中的质点换成匀质刚体杆,即构成了一个绳杆复合摆。文章从全国中学生物理奥林匹克竞赛中的一道题目出发,研究了绳杆复合摆问题,简要阐述了从牛顿定律、守恒定律、拉格朗日力学、哈密顿力学等不同途径解决该问题的多种方法,重点是对绳和杆近似共线情况的分析,并用Mathematica做了数值模拟。当绳和杆满足初始角速度相同、偏转角幅度较小、杆长小于绳长3个条件时,绳和杆近似共线,可以用很简单的实验定性验证。通过数值模拟发现,满足这3个条件时,绳和杆的偏转角、角速度近似相等,并且假设绳杆严格共线在短时间内是一个非常好的近似。但随着时间积累,几十个摆动周期后,与假设严格共线的近似结果会出现较大偏差,尤其对于杆相对于绳较长的情况。 展开更多
关键词 绳杆复合摆 微振动 经典力学 近似法 物理竞赛
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95 GeV light Higgs in the top-pair-associated diphoton channel at the LHC in the minimal dilaton model
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作者 王坤 朱经亚 《Chinese Physics C》 SCIE CAS CSCD 2024年第7期75-83,共9页
Motivated by experimental hints and theoretical frameworks indicating the existence of an extended Higgs sector,we explore the feasibility of detecting a 95 GeV light Higgs boson decaying into a diphoton within the mi... Motivated by experimental hints and theoretical frameworks indicating the existence of an extended Higgs sector,we explore the feasibility of detecting a 95 GeV light Higgs boson decaying into a diphoton within the minimal dilaton model at the 14 TeV LHC.Initially,we identify the correlations between the production cross section,decay branching ratios,and model parameters,e.g.,the scalar mixing angle■Subsequently,we utilize Monte Carlo simulations to generate the signal of the light Higgs boson via the■process,along with the corresponding backgrounds.To effectively separate the signal from the dominant backgrounds■,we employ a meticulous cut-based selection process.Ultimately,we find that with an integrated luminosity of L=3000fb^(-1),the regions of■can be covered over the3σlevel. 展开更多
关键词 95 GeV light Higgs minimal dilaton model Monte Carlo simulations LHC diphoton decay channel
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Smuon in the NMSSM confronted with the muon g–2 anomaly and SUSY searches
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作者 王坤 朱经亚 《Chinese Physics C》 SCIE CAS CSCD 2023年第1期83-92,共10页
Motivated by recent supersymmetry(SUSY)search results,which prefer most SUSY particles to be heavy,and the muon g–2 anomaly,which prefers colorless SUSY particles to be light,we explore the status of a light smuon(th... Motivated by recent supersymmetry(SUSY)search results,which prefer most SUSY particles to be heavy,and the muon g–2 anomaly,which prefers colorless SUSY particles to be light,we explore the status of a light smuon(the SUSY partner of a left-handed muon lepton)in the next-to-minimal supersymmetric standard model(NMSSM).Assuming colored SUSY particles to be heavy,and considering numerous experimental constraints,including muon g-2,SUSY searches,and dark matter,we scan the parameter space in the NMSSM with Z3-symmetry and check the status of colorless SUSY particles and their possible mass order,paying special attention to the smuon.After calculations and discussions,we find that the surviving samples can be divided into several scenarios,where the mass region and decay information of the smuon are given.Overall,the smuon mass can be approximately 0.1~1.8 TeV.These results may be useful for smuon searches at the LHC and future colliders. 展开更多
关键词 supersymmetry phenomenology NMSSM muon g-2
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Light Higgs boson in the NMSSM confronted with the CMS di-photon and di-tau excesses
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作者 李为超 乔豪学 朱经亚 《Chinese Physics C》 SCIE CAS CSCD 2023年第12期31-39,共9页
In 2018, the CMS collaboration reported a di-photon excess at approximately 95.3 GeV with a local significance of 2.8 σ. Interestingly, the CMS collaboration also recently reported a di-tau excess at 95-100 GeV with ... In 2018, the CMS collaboration reported a di-photon excess at approximately 95.3 GeV with a local significance of 2.8 σ. Interestingly, the CMS collaboration also recently reported a di-tau excess at 95-100 GeV with a local significance of 2.6-3.1 σ. In addition, a bb excess at 98 GeV with a local significance of 2.3 σ was reported from LEP data approximately twenty years ago. In this study, we addressed the interpretation of these excesses together with a light Higgs boson in the next-to-minimal supersymmetric standard model(NMSSM). We conclude that, in the NMSSM, the 95-100 GeV excesses are difficult to be satisfied simultaneously(not possible globally at the 1σ level or simultaneously at the 2σ level). We analyzed two partially-satisfied scenarios: global 2σ and small di-photon. An approximate equation of global fit to the three excesses was derived, and two representative types of surviving samples were analyzed in detail. Given that the mass regions of these excesses are near the Z boson, we also checked the light Higgs boson in the tt-associated channels. The detailed results may be useful for further checking the low-mass-region excesses in the future. 展开更多
关键词 Higgs boson supersymmetry phenomenology NMSSM
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水平切割技术在浮法玻璃熔窑池壁上的应用前景
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作者 朱经亚 《天津建材》 2002年第3期26-27,共2页
关键词 水平切割 浮法玻璃 熔窑 切割机 池壁砖
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Higgsino asymmetry and direct-detection constraints of light dark matter in the NMSSM with non-universal Higgs masses
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作者 Kun Wang Jingya Zhu Quanlin Jie 《Chinese Physics C》 SCIE CAS CSCD 2021年第4期14-24,共11页
In this study,we analyze the direct-detection constraints of light dark matter in the next-to minimal supersymmetric standard model(NMSSM)with non-universal Higgs masses(NUHM);we specially focus on the correlation bet... In this study,we analyze the direct-detection constraints of light dark matter in the next-to minimal supersymmetric standard model(NMSSM)with non-universal Higgs masses(NUHM);we specially focus on the correlation between higgsino asymmetry and spin-dependent(SD)cross section.We draw the following conclusions.(i)The SD cross section is proportional to the square of higgsino asymmetry in dark matter X_(1)^(0)in the NMSSM-NUHM,and hence,it is small for highly singlino-dominated dark matter,(ii)The higgsino-mass parameter μeff is smaller than approximately 335 GeV in the NMSSM-NUHM due to the current muon g-2 constraint,but our scenario with light dark matter can still be alive under current constraints including the direct detection of dark matter in the spindependent channel.(iii)With a sizeable higgsino component in the light dark matter,the higgsino asymmetry and SD cross section can also be sizeable,but dark matter relic density is always small;thus,it can escape the direct detections.(iv)Light dark matter in the h_(2)-and Z-funnel annihilation channels with sufficient relic density can be covered by future LUX-ZEPLIN(LZ)7-ton in SD detections.(v)The spin-independent(SI)cross section is dominated by h_(1)-and h_(2)-exchanging channels,which can even cancel each other in some samples,leaving an SI cross section smaller by a few orders of magnitude than that of one individual channel. 展开更多
关键词 dark matter supersymmetry phenomenology NMSSM
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The semi-constrained NMSSM in light of muon g-2,LHC,and dark matter constraints
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作者 Kun Wang Fei Wang +1 位作者 Jingya Zhu Quanlin Jie 《Chinese Physics C》 SCIE CAS CSCD 2018年第10期69-78,共10页
The semi-constrained NMSSM (scNMSSM) extends the MSSM by a singlet field, and requires unification of the soft SUSY breaking terms in the squark and slepton sectors, while it allows that in the Higgs sector to be di... The semi-constrained NMSSM (scNMSSM) extends the MSSM by a singlet field, and requires unification of the soft SUSY breaking terms in the squark and slepton sectors, while it allows that in the Higgs sector to be different. We try to interpret the muon g-2 in the scNMSSM, under the constraints of 125 GeV Higgs data, B physics, searches for low and high mass resonances, searches for SUSY particles at the LHC, dark matter relic density by WMAP/Planck, and direct searches for dark matter by LUX, XENON1T, and PandaX-II. We find that under the above constraints, the scNMSSM can still (i) satisfy muon g-2 at 1α level, with a light muon sneutrino and light chargino; (ii) predict a highly-singlet-dominated 95 GeV Higgs, with a diphoton rate as hinted at by CMS data, because of a light higgsino-like chargino and moderate )λ; (iii) get low fine tuning from the GUT scale with small μeff,M0,M1/2,andAo, with a lighter stop mass which can be as low as about 500 GeV, which can be further checked in future studies with search results from the 13 TeV LHC; (iv) have the lightest neutralino be singlino-dominated or higgsino-dominated, while the bino and wino are heavier because of high gluino bounds at the LHC and universal gaugino conditions at the GUT scale; (v) satisfy all the above constraints, although it is not easy for the lightest neutralino, as the only dark matter candidate, to get enough relic density. Several ways to increase relic density are discussed. 展开更多
关键词 NMSSM supersymmetry phenomenology dark matter
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