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1. Enhancing $tar{t}hh$ production through CP-violating top-Higgs interaction at the LHC and future colliders | |||
Liu Ning,Zhang Yan-Min,Han Jin-Zhong,Yang Bing-Fang | |||
Physics 16 May 2017 | |||
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Abstract:The measurement of Higgs self-coupling is one of the most crucial physics goals at the future colliders. At the LHC, the di-Higgs production is a main way to measure the Higgs trilinear coupling. As a complementary to the di-Higgs production, $t ar{t} hh$ process may open a new avenue to measure di-Higgs physics at the LHC and a future 100 TeV $pp$ collider or a high energy $e^+e^-$ collider since the extra $tar t$ in the final states may efficiently suppress the backgrounds. However, such a kind of process is also controlled by the top-Higgs coupling. In this work, we investigate the impact of CP-violating top-Higgs coupling on production at the LHC, $e^+e^-$ and a 100 TeV hadron collider under the current Higgs data. Within Higgs data allowed parameter region, we find that the cross section of $tar{t}hh$ at the LHC-14 TeV, $e^+e^-$-1 TeV and VHE-LHC/SPPC-100 TeV can be enhanced up to 2.1 times the SM predictions. The future precise measurement of Higgs coupling will reveal the nature of top-Higgs interaction and improve the sensitivity of the determination of Higgs self-coupling through $tar{t}hh$ production. | |||
TO cite this article:Liu Ning,Zhang Yan-Min,Han Jin-Zhong, et al. Enhancing $tar{t}hh$ production through CP-violating top-Higgs interaction at the LHC and future colliders[OL].[16 May 2017] http://en.paper.edu.cn/en_releasepaper/content/4732370 |
2. 750 GeV Diphoton Resonance in a Vector-like Extension of Hill Model | |||
Liu Ning,Wang Wen-Yu,Zhang Meng-Chao,Zheng Rui | |||
Physics 04 May 2017 | |||
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Abstract:In this paper, we study the recent 750 GeV diphoton excess in the Hill Model with vector-like fermions, in which the singlet-like Higgs boson is chosen as 750 GeV resonance and is mainly produced by the gluon fusion through vector-like top and bottom quarks. Meanwhile its diphoton decay rate is greatly enhanced by the vector-like lepton. Under the current experimental and theoretical constraints, we present the viable parameter space that fits the 750 GeV diphoton signal strength at 13 TeV LHC. We find that the heavier vector-like fermion masses are, the smaller mixing angle $ heta$ is required. The mixing angle of singlet and doublet Higgs bosons is constrained within $|sin heta| lesssim 0.15$ in the condition of the perturbative Yukawa couplings. In the allowed parameter space, the 750 GeV diphoton cross section can be maximally enhanced to about 6 fb at 13 TeV LHC. | |||
TO cite this article:Liu Ning,Wang Wen-Yu,Zhang Meng-Chao, et al. 750 GeV Diphoton Resonance in a Vector-like Extension of Hill Model[OL].[ 4 May 2017] http://en.paper.edu.cn/en_releasepaper/content/4730538 |
3. Is the newly observed $X(5568)$ a $Bar{K}$ molecular state? | |||
Rui Chen,Xiang Liu | |||
Physics 25 May 2016 | |||
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Abstract:In this work, the performed dynamical study of the $B^{(*)}$ and $ar{K}$ interaction shows that the newly observed $X(5568)$ or$X(5616)$ cannot be assigned to be an isovector $Bar{K}$ or $B^*ar{K}$ molecular state. We continue to investigate the isoscalar $B^{(*)}ar{K}$ systems, and the $B^{(*)}ar{K}^{*}$ systems with isospin $I=0,1$, andpredict the existences of several isoscalar $B^{(*)}ar K^{(*)}$ molecular states. A new taskof exploring open-bottom molecular states will be created for future experiment. | |||
TO cite this article:Rui Chen,Xiang Liu. Is the newly observed $X(5568)$ a $Bar{K}$ molecular state?[OL].[25 May 2016] http://en.paper.edu.cn/en_releasepaper/content/4692527 |
4. Radiative corrections to e+e-→Zh at future Higgs factory in the Minimal Dilaton Model | |||
HENG Zhaoxia,LI Dongwei,ZHOU Haijing | |||
Physics 15 December 2014 | |||
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Abstract:The minimal dilaton model (MDM) extends the Standard Model by one singlet scalar calleddilaton and one top quark partner called t′. In this work we investigate the t′-induced radiative correction to the Higgs-strahlung production process e+e-→Zh at future Higgs factory. We first present the analytical calculations in detailand show how to handle the ultraviolet divergence. Then we calculate the correctionnumerically by considering the constraints from precision electroweak data.We find that, for sinθL=0.2 and mt′=1200GeV,the correction is 0.26% and 2.1% for √se+e-=240GeV, 1TeV respectively, and a larger value can be achieved as sinθL increases. | |||
TO cite this article:HENG Zhaoxia,LI Dongwei,ZHOU Haijing. Radiative corrections to e+e-→Zh at future Higgs factory in the Minimal Dilaton Model[OL].[15 December 2014] http://en.paper.edu.cn/en_releasepaper/content/4623181 |
5. 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 |
6. Higgs Mass in Dark Matter Selected High-Scale Supersymmetry | |||
ZHENG Si-Bo | |||
Physics 13 October 2014 | |||
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Abstract:The prediction for the Higgs mass in dark matter selected high-scale SUSY is explored. We show the bounds on SUSY-breaking scale in models of SM $+ ilde{w}$ and SM $+ ilde{h}/ ilde{s}$ due to observed Higgs mass at the LHC . This study of high-scale SUSY supports the idea that the inflation and SM superpartners probably share the same origin of SUSY breaking. | |||
TO cite this article:ZHENG Si-Bo . Higgs Mass in Dark Matter Selected High-Scale Supersymmetry[OL].[13 October 2014] http://en.paper.edu.cn/en_releasepaper/content/4613372 |
7. Mass Hierarchies with $m_{h}=125$ GeV from Natural SUSY | |||
ZHENG Si-Bo | |||
Physics 13 October 2014 | |||
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Abstract:Our study starts with a sequence of puzzles that include$(a)$ at which level $mu$ problem involving electroweak symmetry breaking can be solved;$(b)$ in which paradigm masses of superpartners in the third family can be lighter than in the first two families;$(c)$ whether it is possible to accommodate 125 GeV Higgs boson simultaneously;and $(d)$ how natural such paradigm is.These issues are considered in the context of two-site SUSY models.Both the MSSM and NMSSM as low-energy effective theory below the scale of two-site gauge symmetry breaking are investigated.We find that the fine tuning can be indeed reduced in comparison with ordinary MSSM with $m_{h}=125$ GeV.In general, the fine tuning parameter $Delta$ is in the range of $20-400$. | |||
TO cite this article:ZHENG Si-Bo . Mass Hierarchies with $m_{h}=125$ GeV from Natural SUSY[OL].[13 October 2014] http://en.paper.edu.cn/en_releasepaper/content/4613366 |
8. Higgs-strahlung production process $e^+ e^- o Z h$ at the future Higgs factory in the Minimal Dilaton Model | |||
Cao Junjie, Heng Zhaoxia, Li Dongwei, Shang Liangliang, Wu Peiwen | |||
Physics 05 June 2014 | |||
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Abstract:We investigate the Higgs-strahlung production process $e^+ e^- o Z h$ at the future Higgs factorysuch as TLEP by including radiative corrections in the Minimal Dilaton Model (MDM),which extends the SM by one singlet scalar called dilaton.We consider various theoretical and experimental constraints on the model, and perform fits tothe Higgs data taken from ATLAS, CMS and CDF+D0. Then for the 1$sigma$ surviving samples,we calculate the MDM predictions on the inclusive production rate $sigma(e^+e^- o Zh)$ at the 240-GeVHiggs factory, and also the signal rates of $e^+e^- o Zh$ with the Higgs boson decaying to $bar b$and $gammagamma$. We have following observations:(1) In the heavy dilaton scenario, the deviation of $sigma(e^+e^- o Zh)$ from itsSM prediction can vary from $-15%$ to $85%$, which mainly arises from the modification of the tree-level $hZZ$ couplingand also the radiative correction induced by possibly large Higgs self-couplings. (2) The processes $e^+e^- o Zh$ atthe Higgs factory and $pp o hh$ at 14-TeV LHCare complementary in limiting the MDM parameter space. Requiring the deviation of $sigma(e^+e^- o Zh)$from its SM prediction to be less than $1%$ and that of $sigma(p p o h h)$ to be less than $50%$,$ an heta_S$ in the MDM will be limited to be $-0.1< an heta_S<0.3$, and the deviations of thesignal rates are constrained to be $|R_{bar b}|<2%$ and $|R_{gammagamma}|<7%$. Especially, the Higgs self-couplingnormalized to its SM prediction is now upper bounded by about 4.(3) In the light dilaton scenario, the deviation of $sigma(e^+e^- o Zh)$ may reach $-7%$, andrequiring its size to be less than $1%$ will result in $0< an heta_S<0.1$, and $-10% < R_{bar b}, R_{gammagamma} < 1%$. | |||
TO cite this article:Cao Junjie, Heng Zhaoxia, Li Dongwei, et al. Higgs-strahlung production process $e^+ e^- o Z h$ at the future Higgs factory in the Minimal Dilaton Model[OL].[ 5 June 2014] http://en.paper.edu.cn/en_releasepaper/content/4600019 |
9. The Impact of a Family Non-universal Z' Boson on Hadronic b->s Transitions | |||
Chang Qin, Li Xin-Qiang, Yang Ya-Dong | |||
Physics 28 February 2014 | |||
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Abstract:Motivated by the latest improved measurements of B-meson decays, we make a combined updated analysis of the impact of a family non-universal $Z^{prime}$ boson on $B_s-ar{B}_s$ mixing and two-body hadronic B-meson decays, all being characterized by the quark-level $b o s$ transition. In this paper, 22 B-meson decay modes and related 52 observables are evaluated, and some interesting correlations between the observables are carefully examined. Firstly, we extract the allowed oases of $b-s-Z^{prime}$ coupling parameters $|B^{L,R}_{sb}|$ and $phi^{L,R}_s$ through $B_s-ar{B}_s$ mixing. Then, in the ``SM limit", focusing on the so-called ``$pi K$ CP puzzle'', we study the $Z^{prime}$ effects on the $B opi K$, $pi K^{st}$ and $ ho K$ decays. Moreover, the impacts of $Z^{prime}$ boson on $ar{B}_s o K K$, $K K^{st}$ and $pi^0 phi$ decays, being induced by the same quark-level $b o s qar{q}~(q=u,d)$ transitions, are also evaluated. Finally, to check the non-universality of $Z^{prime}$ boson couplings to light quark pairs, we have studied $B o phi K$ decays. | |||
TO cite this article:Chang Qin, Li Xin-Qiang, Yang Ya-Dong. The Impact of a Family Non-universal Z' Boson on Hadronic b->s Transitions[OL].[28 February 2014] http://en.paper.edu.cn/en_releasepaper/content/4588161 |
10. Study on decay properties of unstable hadrons | |||
Chen HuaXing | |||
Physics 21 November 2013 | |||
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Abstract:Some unstable hadrons (resonances) mainly decay into two final states in a very short time. This paper estimates how far at most these two final states can travel away from each other in the half-life of the initial unstable hadron. As examples, this distance is about 2.5 fm for $ ho ightarrow pi pi$, 1.8 fm for $Delta ightarrow N pi$, and 0.6 fm for $f_0(500) ightarrow pi pi$. This paper calculates this distance for altogether 181 hadrons, among all the 324 ones listed in PDG2012. It is around one femtometer for many hadrons, which is of the same order of magnitude as the hadronic radii. This paper also estimates this distance for altogether 15 unstable nuclei. It is about several femtometers for some of them, which is of the same order of magnitude as the nuclear radii. | |||
TO cite this article:Chen HuaXing. Study on decay properties of unstable hadrons[OL].[21 November 2013] http://en.paper.edu.cn/en_releasepaper/content/4571249 |
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