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1. Is Zb(10610) a Molecular State | |||
KE Hong-Wei, LI Xue-Qian, SHI Yan-Liang, WANG Guo-Li, YUAN Xu-Hao | |||
Physics 22 February 2012 | |||
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Abstract:Whether molecular states indeed exist in nature has beendisputed for a long time. Several new resonances have been observedin the recent experiments and they seem to be of exotic structuresand some of them have been proposed to be molecular states. The veryrecent observation of Zb(10610)[(10608.4pm±2.0) MeV] and Zb(10650)[(10653.2pm ±1.5) MeV] encourages the interpretation ofmulti-quark states. In the Beter-Salpeter (BS) approach, we studythe possibility if two heavy mesons can form a molecular state byexchanging light mesons. Our results indicate that two heavy mesonscan form an isospin singlet (I=0) bound state but cannot form anisospin triplet (I=1) when the contribution of σ- exchangeis reasonably small, i.e. as the coupling of σ with mesons gσ takes the value given in previous literatures. Thus weconclude that the newly observed Zb(10610) should not be amolecular state, but a tetraquark state instead, at most, thefraction of the molecular state in the physical resonance Zb(10610) is tiny. | |||
TO cite this article:KE Hong-Wei, LI Xue-Qian, SHI Yan-Liang, et al. Is Zb(10610) a Molecular State[J]. |
2. What do the radiative decays of X(3872) tell us | |||
KE Hongwei,LI Xueqian | |||
Physics 15 November 2011 | |||
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Abstract:Since the discovery of X(3872), its structure has beenin ceaseless dispute. The Belle and Babar collaborations havemeasured the decay rates of X(3872)->π+π-π0J/Ψ and the data suggest that X(3872) may be a high-spincharmonium of 2-+ instead of other exotic assignments.Recently the radiative decays of X(3872) which may explicitlydetermine the quantum number and structure of X(3872), have beenmeasured by the two collaborations. In terms of the light frontquark model (LFQM) we calculate the rates of the radiative decaysX(3872)->J/Ψ(Ψ')γ supposing X(3872) to bea 2-+ charmonium. Within this framework, our theoreticalprediction on mathcalR(X(3872)->Ψ(1S)γ) isat order of 10-3 which is slightly lower than the Babar'sdata but close to the Belle's. Instead, our prediction onBR(X(3872)->Ψ'γ) is at order of10-5 if psi is a pure 2S state or 10-4 if psi isa 2S-1D mixture, which does not conflict with the upper boundset by the Belle collaboration, but is much lower than the Babar'sdata, The future measurements will accurately determine thisbranching ratio, thus if the future measurement decides thebranching ratio of BR(X(3872)->Ψ'γ)to be much larger than 10-4, the assignment of 2-+ forX(3872) should be ruled out. Since the signal of the radiativedecay is clean, it is worth careful study from both experimentaland theoretical aspects. | |||
TO cite this article:KE Hongwei,LI Xueqian. What do the radiative decays of X(3872) tell us[J]. |
3. Precise predictions for the Higgs production in association with a W-boson pair at ILC | |||
Song Mao,Ma Wen-Gan,Zhang Ren-You,Guo Lei,Wang Shao-Ming | |||
Physics 04 September 2008 | |||
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Abstract:The Higgs-boson production in association with a W-boson pair at $e^+e^-$ linear colliders is one of the important processes in probing the coupling between Higgs-boson and vector gauge bosons and discovering the signature of new physics. We describe the impact of the complete electroweak(EW) radiative corrections of ${\\\\\\\\\\\\\\\\cal O}(\\\\\\\\\\\\\\\\alpha_{ew})$ to this process in the standard model(SM) at the International Linear Collider(ILC), and investigate the dependence of the lowest-order(LO) and EW next-to-leading order(NLO) corrected cross sections on colliding energy $\\\\\\\\\\\\\\\\sqrt{s}$ and Higg-boson mass. The LO and NLO EW corrected distributions of the invariant mass of W-boson pair and the transverse momenta of final $W$- and Higgs-boson are presented. Our numerical results show that the relative EW radiative correction($\\\\\\\\\\\\\\\\delta_{ew}$) varies from $-19.4\\\\\\\\\\\\\\\\%$ to $0.2\\\\\\\\\\\\\\\\%$ when $m_H=120~GeV$ and $\\\\\\\\\\\\\\\\sqrt{s}$ goes up from $300~GeV$ to $1.2~TeV$. | |||
TO cite this article:Song Mao,Ma Wen-Gan,Zhang Ren-You, et al. Precise predictions for the Higgs production in association with a W-boson pair at ILC[OL].[ 4 September 2008] http://en.paper.edu.cn/en_releasepaper/content/23778 |
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