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1. A Combined Fit on the Annihilation Corrections in $B_{u,d,s}$ $ o$ $PP$ Decays Within QCDF | |||
Chang Qin, Sun Junfeng, Yang Yueling, Li Xiaonan | |||
Physics 22 October 2014 | |||
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Abstract:Motivated by the possible large annihilation contributions implied by recent CDF and LHCb measurements on nonleptonic annihilation $B$-meson decays, and the refined experimental measurements on hadronic $B$-meson decays, we study the strength of annihilation contributions within QCD factorization (QCDF) in this paper. With the available measurements of two-body $B_{u,d,s}$ ${ o}$ ${pi}{pi}$, ${pi}K$, $KK$ decays, a comprehensive fit on the phenomenological parameters $X_{A}^{i,f}$ (or ${ ho}_A^{i,f}$ and ${phi}_A^{i,f}$) which are used to parameterize the endpoint singularity in annihilation amplitudes is performed with the statistical $chi^2$ approach. It is found that (1) flavour symmetry breaking effects are hardly to be distinguished between $X_{A,s}^i$ and $X_{A,d}^i$ due to the large experimental errors and theoretical uncertainties, where $X_{A,s}^i$ and $X_{A,d}^i$ are related to the nonfactorization annihilation contributions in $B_{s}$ and $B_{u,d}$ decay, respectively. So $X_{A,s}^i$ ${simeq}$ $X_{A,d}^i$ is a good approximation by now. (2) In principle, parameter $X_{A}^f$ who is related to the factorization annihilation contributions and independent of the initial state can be regarded as the same variable for $B_{u,d,s}$ decays. (3) Numerically, two solutions are found, one is $( ho_A^i, phi_A^i[^{circ}])$ $=$ $(3.00^{+1.25}_{-0.96},-104^{+36}_{-26})$ and $( ho_A^f, phi_A^f[^{circ}])$ $=$ $(1.18^{+0.24}_{-0.20},-42^{+13}_{-5})$, the other is $( ho_A^i, phi_A^i[^{circ}])$ $=$ $(2.85^{+1.48}_{-0.79},-100^{+33}_{-28})$ and $( ho_A^f, phi_A^f[^{circ}])$ $=$ $(2.83^{+0.21}_{-0.21},165^{+3}_{-4})$. Obviously, $( ho_{A}^{i},phi_{A}^{i})$ $ eq$ $( ho_{A}^{f},phi_{A}^{f})$, i.e., nonfactorization annihilation parameter $X_{A}^{i}$ is generally unequal to factorization annihilation parameter $X_{A}^{f}$, which differs from the traditional treatment. With the fitted parameters, all results for observables of $B_{u,d,s}$ $ o$ ${pi}{pi}$, ${pi}K$, $KK$ decays are in good agreement with experimental data. | |||
TO cite this article:Chang Qin, Sun Junfeng, Yang Yueling, et al. A Combined Fit on the Annihilation Corrections in $B_{u,d,s}$ $ o$ $PP$ Decays Within QCDF[OL].[22 October 2014] http://en.paper.edu.cn/en_releasepaper/content/4614867 |
2. 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]. |
3. 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]. |
4. 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 |
5. Complete one-loop electroweak corrections to $ZZZ$ production at the ILC | |||
Su Ji-Juan,Ma Wen-Gan,Zhang Ren-You,Wang Shao-Ming,Guo Lei | |||
Physics 22 July 2008 | |||
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Abstract:We study the complete ${cal O}(alpha_{ew})$ electroweak (EW) corrections to the production of three -bosons in the the framework of the standard model(SM) at the ILC. The leading order and the EW next-to-leading order corrected cross sections are presented, and their dependence on the colliding energy $sqrt{s}$ and Higgs-boson mass $m_{H}$ is analyzed. We investigate also the LO and one-loop EW corrected distributions of the transverse momentum of final $Z^0$ boson, and the invariant mass of $Z^0Z^0$-pair. Our numerical results show that the EW one-loop correction generally suppresses the tree-level cross section, and the relative correction with $m_{H}=120~GeV(150~GeV)$ varies between $-15.8%(-13.9%)$ and $-7.5%(-6.2%)$ when $sqrt{s}$ goes up from $350~GeV$ to $1~TeV$. | |||
TO cite this article:Su Ji-Juan,Ma Wen-Gan,Zhang Ren-You, et al. Complete one-loop electroweak corrections to $ZZZ$ production at the ILC[OL].[22 July 2008] http://en.paper.edu.cn/en_releasepaper/content/22988 |
6. Vacuum Fluctuations Based Model of Photons and Electrons | |||
Ye Xinghao | |||
Physics 21 May 2008 | |||
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Abstract:The aim of this paper is to suggest a vacuum fluctuations based model of photons and electrons. In doing this, three postulates of vacuum fluctuations are proposed first, which is consonant with the basic premises of relativity and quantum mechanics. As applications, the model is used to analyze the Compton effect and the electron-positron annihilation. It is found that calculations are simple, and the physical meaning is clear. Also, the spin of photons and electrons is discussed in a preliminary way. | |||
TO cite this article:Ye Xinghao. Vacuum Fluctuations Based Model of Photons and Electrons[OL].[21 May 2008] http://en.paper.edu.cn/en_releasepaper/content/21611 |
7. One-loop QCD corrections to the e+e-→ W+W+b-b- process at the ILC | |||
Guo Lei,Ma Wen-Gan,Zhang Ren-You,Wang Shao-Ming | |||
Physics 07 March 2008 | |||
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Abstract:We study the full contributions at the leading order(LO) and QCD next-to-leading order(NLO) to the cross section of the $e^+e^- \to W^+ W^- b\bar b$ process in the standard model(SM) at the ILC. In dealing the resonance problem we adopted the complex mass scheme in both tree-level and one-loop level perturbative calculations. Our numerical results show that the K-factor varies from $1.501$ to $0.847$ when $\sqrt{s}$ goes up from $360~GeV$ to $1.5~TeV$. We investigate the dependence of the LO and QCD NLO corrected cross sections of process $e^+e^- \to W^+ W^- b\bar b$ on colliding energy $\sqrt{s}$ and Higgs-boson mass. We also present the results of the LO and QCD NLO corrected distributions of the transverse momenta of final particles, and the invariant masses of $Wb$-, $b\bar b$- and $WW$-pair. | |||
TO cite this article:Guo Lei,Ma Wen-Gan,Zhang Ren-You, et al. One-loop QCD corrections to the e+e-→ W+W+b-b- process at the ILC[OL].[ 7 March 2008] http://en.paper.edu.cn/en_releasepaper/content/19114 |
8. Nonstandard Higgs in Electroweak Chiral Lagrangian | |||
Wang Liming ,Wang Qing | |||
Physics 14 November 2006 | |||
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Abstract:We add a nonstandard higgs into the traditional bosonic part of electroweak chiral Lagrangian, in purpose of finding out the contribution to EWCL coefficients from processes with internal line higgs particle. To construct the effective Lagrangian with higgs, we use low energy expansion scheme and write down all the independent terms conserving $SU(2)\times U_Y(1)$ symmetry in the nonlinear representation which we show is equivalent to the linear representation. Then we integrate out higgs using loop expansion technique at 1-loop level, contributions from all possible terms are obtained. We find up to order of $p^4$ in low energy expansion, three terms, $\mathcal{L}_5$, $\mathcal{L}_7$, $\mathcal{L}_{10}$ in EWCL are important, for which the contributions from higgs can be further expressed in terms of higgs partial decay width $\Gamma_{h\rightarrow ZZ}$ and $\Gamma_{h\rightarrow WW}$. Higg mass dependence of the coefficients in EWCL are discussed. | |||
TO cite this article:Wang Liming ,Wang Qing. Nonstandard Higgs in Electroweak Chiral Lagrangian[OL].[14 November 2006] http://en.paper.edu.cn/en_releasepaper/content/9530 |
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