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正负电子对撞中类底夸克偶素的线形

叶全兴 何广朝 王倩

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正负电子对撞中类底夸克偶素的线形

叶全兴, 何广朝, 王倩

Bottominium-like states in e+e annihilation

Ye Quan-Xing, He Guang-Zhao, Wang Qian
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  • 在重夸克自旋对称性下构造量子数为$J^{{\rm{PC}}}=1^{--}$${\rm{P}}$${\rm{B}}^{(*)}\bar{{\rm{B}}}^{(*)}$有效相互作用势, 代入李普曼-史温格方程求得${\rm{e^+e^-}}\to {\rm{B}}^{(*)}\bar{{\rm{B}}}^{(*)}$的散射振幅, 发现对应的散射截面可以解释现有的实验数据. 研究发现底夸克偶素的质量移动很小, 主要是由于底夸克偶素和${\rm{B}}^{(*)}\bar{{\rm{B}}}^{(*)}$道的有效耦合比较小. 因此, ${\rm{e^+e^-}}\to $$ {\rm{B}}^{(*)}\bar{{\rm{B}}}^{(*)}$截面上的峰结构主要是$\Upsilon(4{\rm{S}})$, $\Upsilon(3{\rm{D}})$, $\Upsilon(5{\rm{S}})$$\Upsilon(6{\rm{S}})$的贡献. 能量在$10.63\; {\rm{GeV}}$处的窄峰值结构需要实验上进一步细致扫描和理论上拟合公式的优化.
    In the conventional quark model, meson is made of one quark and one antiquark, and baryon is made of three quarks. Since the observation of the ${\rm{X}}(3872)$ in 2003 by Belle collaboration, numerous exotic candidates beyond the conventional quark model have been observed. Most of them are located in heavy quarkonium energy region. Several interpretations, e.g. compact multiquarks, hadronic molecules, hybrids, etc, are proposed to understand their internal structures. Hadronic molecules are based on the fact that most of exotic candidates have nearby thresholds, which makes them analogies of deuteron made of one proton and one neutron. Whether two or more hadrons can be form a hadronic molecule or not depends on their interactions. In this work, we study the ${\rm{P}}$-wave ${\rm{B}}^{(*)}\bar{{\rm{B}}}^{(*)}$ interactions based on the ${\rm{e^+e^-}}\to {\rm{B}}^{(*)}\bar{{\rm{B}}}^{(*)}$ cross sections from Belle-II experiment to study whether their interaction can form vector bottomonium-like states or not. As ${\rm{B}}^{(*)}$ and $\bar{{\rm{B}}}^{(*)}$ mesons have bottom and antibottom quark, respectively, we work in the heavy quark limit, which respects both heavy quark spin symmetry and heavy quark flavor symmetry. In this framework, we construct effective contact potentials for $J^{{\rm{PC}}}=1^{--}$ ${\rm{P}}$-wave ${\rm{B}}^{(*)}\bar{{\rm{B}}}^{(*)}$ interactions, by decomposing the ${\rm{B}}^{(*)}\bar{{\rm{B}}}^{(*)}$ dynamic channels into heavy-light basis. That, in the heavy quark limit, heavy and light degrees of freedoms are conserved individually makes the contact potentials in a very simple form. After solving the corresponding Lippmann-Schwinger equation, one can obtain the ${\rm{e^+e^-}}\to {\rm{B}}^{(*)}\bar{{\rm{B}}}^{(*)}$ scattering amplitudes. With these scattering amplitudes, we can deduce the corresponding cross sections,which can be compared with the experimental data directly. By fitting to the data, we find that the mass shifts of the considered bottomonia are small due to their small couplings to the ${\rm{B}}^{(*)}\bar{{\rm{B}}}^{(*)}$ continuum channels. As the result, the $\Upsilon(4{\rm{S}})$, $\Upsilon(3{\rm{D}})$, $\Upsilon(5{\rm{S}})$ and $\Upsilon(6{\rm{S}})$ vector bottomonia express theirselves as peaks at $10.58\; {\rm{GeV}}$, $10.87\; {\rm{GeV}}$, $11.03\; {\rm{GeV}}$. The peak at $10.87\; {\rm{GeV}}$ is the interference between $\Upsilon(3{\rm{D}})$ and $\Upsilon(5{\rm{S}})$. As there are only two data points around $10.63\; {\rm{GeV}}$, we cannot obtain a very clear conclusion about the peak around this energy point. To further explore its nature, both detailed scan around this energy region in experiment and improved formula in theory are needed.
      通信作者: 王倩, qianwang@m.scnu.edu.cn
    • 基金项目: 国家自然科学基金重点项目(批准号: 12035007)和广东省基金(批准号: 2019QN01X172)资助的课题.
      Corresponding author: Wang Qian, qianwang@m.scnu.edu.cn
    • Funds: Project supported by the Key Program of the Natural Science Foundation of China (Grant No. 12035007) and the Guangdong Provincial Funding, China (Grant No. 2019QN01X172).
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    Wang Q 2014 Phys. Rev. D 89 114013Google Scholar

    [33]

    Ji T, Dong X K, Guo F K, Zou B S 2022 Phys. Rev. Lett. 129 102002Google Scholar

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    Mizuk R, Bondar A, Adachi I, et al. 2021 JHEP 06 137Google Scholar

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    Baru V, Epelbaum E, Filin A A, Hanhart C, Nefediev A V, Wang Q 2019 Phys. Rev. D 99 094013Google Scholar

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  • 图 1  质心能量在$ [10.55, 11.03]\; {\rm{GeV}} $之间 $ {\rm{e^+e^-}} \rightarrow {\rm{B}}^{(*)}\bar{{\rm{B}}}^{(*)} $的散射截面. 实验数据点来自BelleII合作组[34]. 蓝色实线是理论计算的截面. 3条垂直的红色虚线从低到高分别是$ {\rm{B}}\bar{{\rm{B}}} $, $ {\rm{B}}\bar{{\rm{B}}}^* $, $ {\rm{B}}^*\bar{{\rm{B}}}^* $的阈值. 其中$ {\rm{e^+e^-}}\to {\rm{B}}^*\bar{{\rm{B}}}^* $过程的截面是第3个道和第4个道贡献的总和

    Fig. 1.  The cross sections of the $ {\rm{e^+e^-}} \rightarrow {\rm{B}}^{(*)}\bar{{\rm{B}}}^{(*)} $ in the center of mass energy region $ [10.55, 11.03]\; {\rm{GeV}} $. The blue solid curves are the theoretical results. The vertical red dashed lines are the $ {\rm{B}}\bar{{\rm{B}}} $, $ {\rm{B}}\bar{{\rm{B}}}^* $, $ {\rm{B}}^*\bar{{\rm{B}}}^* $ thresholds. The cross section of the $ {\rm{e^+e^-}}\to {\rm{B}}^*\bar{{\rm{B}}}^* $ process is the sum of that of the third and forth channels

    表 1  拟合参数和约化卡方

    Table 1.  Fitted parameters and the corresponding reduced $ \chi ^2 $

    参数名 参数值 单位
    $ C_0 $ $ 0.160\pm 0.149 $ $ {\rm{GeV}}^{-2} $
    $ C_1 $ $ 1.669\pm 0.003 $ $ {\rm{GeV}}^{-2} $
    $ C_2 $ $ -1.785\pm 2.677 $ $ {\rm{GeV}}^{-2} $
    $ g_{4{\rm{S}}} $ $ -2.377\pm 0.180 $ $ {\rm{GeV}}^{0} $
    $ g_{3{\rm{D}}} $ $ 0.966\pm 0.430 $ $ {\rm{GeV}}^{0} $
    $ g_{5{\rm{S}}} $ $ -0.571\pm 0.073 $ $ {\rm{GeV}}^{0} $
    $ g_{6{\rm{S}}} $ $ 0.252\pm 0.102 $ $ {\rm{GeV}}^{0} $
    $ f_{{\rm{S}}}^0 $ $ 1.040\pm 0.097 $ $ {\rm{GeV}}^{0} $
    $ f_{D}^0 $ $ -1.543\pm 1.535 $ $ {\rm{GeV}}^{0} $
    $ m_{4{\rm{S}}} $ $ 10.468\pm 0.043 $ $ {\rm{GeV}} $
    $ m_{3{\rm{D}}} $ $ 10.856\pm 0.004 $ $ {\rm{GeV}} $
    $ m_{5{\rm{S}}} $ $ 10.830\pm 0.011 $ $ {\rm{GeV}} $
    $ m_{6{\rm{S}}} $ $ 11.024\pm 0.008 $ $ {\rm{GeV}} $
    $ \mit \Lambda $ $ 2.448\pm 0.001 $ $ {\rm{GeV}} $
    $ \mit \Gamma_1 $ $ 0.029\pm 0.017 $ $ {\rm{GeV}} $
    $ \mit \Gamma_2 $ $ 0.033\pm 0.010 $ $ {\rm{GeV}} $
    $ \mit \Gamma_3 $ $ 0.139\pm 0.025 $ $ {\rm{GeV}} $
    $ \mit \Gamma_4 $ $ 0.027\pm 0.015 $ $ {\rm{GeV}} $
    $ \dfrac{\chi^2}{{\rm{d.o.f}}} $ 3.37 $ - $
    下载: 导出CSV

    表 2  物理黎曼面$ R_{+++} $, 离物理黎曼面近的黎曼面 $ R_{-++}, R_{–+}, R_{---} $上的极点(第2列)和主要耦合道及其有效耦合常数(第3列)

    Table 2.  Poles on the physical sheet $ R_{+++} $, those $ R_{-++}, R_{-+}, R_{---} $ close to the physical one (the second column), the dominant channel with the corresponding effective coupling (the third column)

    黎曼面 极点/GeV D.C.($ g^{\rm{eff}} $/$ {\rm{MeV}}^{-1/2} $)
    $ R_{+++} $ $ 10.638-0.000 {\rm{i}} $ ($ {\rm{B}}^*\bar{{\rm{B}}}^*)^{s=0} $ [0.52]
    $ 10.871-0.014 {\rm{i}} $ $ {\rm{B}}\bar{{\rm{B}}}^* $ [0.05]
    $ 11.024-0.009 {\rm{i}} $ ($ {\rm{B}}^*\bar{{\rm{B}}}^*)^{s=2} $ [0.06]
    $ R_{-++} $ $ 10.876-0.016 {\rm{i}} $ (${\rm{B}}^*\bar{{\rm{B}}}^*)^{s=2} $ [0.03]
    $ 11.024-0.008 {\rm{i}} $ ($ {\rm{B}}^*\bar{{\rm{B}}}^*)^{s=2} $ [0.05]
    $ R_{--+} $ $ 10.873-0.021 {\rm{i}} $ ($ {\rm{B}}^*\bar{{\rm{B}}}^*)^{s=2} $ [0.01]
    $ 11.018-0.008 {\rm{i}} $ ($ {\rm{B}}^*\bar{{\rm{B}}}^*)^{s=0} $ [0.00]
    $ R_{---} $ $ 10.587-0.00 {\rm{i}} $ $ {\rm{B}}\bar{{\rm{B}}}^* $ [0.01]
    $ 10.635-0.033 {\rm{i}} $ ($ {\rm{B}}^*\bar{{\rm{B}}}^*)^{s=2} $ [0.01]
    $ 10.846-0.090 {\rm{i}} $ ($ {\rm{B}}^*\bar{{\rm{B}}}^*)^{s=0} $ [0.00]
    $ 10.871-0.020 {\rm{i}} $ ($ {\rm{B}}^*\bar{{\rm{B}}}^*)^{s=2} $ [0.01]
    下载: 导出CSV
  • [1]

    Gell-Mann M 1964 Phys. Lett. 8 214Google Scholar

    [2]

    Zweig G 1964 An SU(3) model for strong interaction symmetry and its breaking CM-P0004288

    [3]

    Choi S K, Olsen S L, Abe K, et al. 2003 Phys. Rev. Lett. 91 262001Google Scholar

    [4]

    Chen H X, Chen W, Liu X, Zhu S L 2016 Phys. Rep. 639 1Google Scholar

    [5]

    Chen H X, Chen W, Liu X, Liu Y R, Zhu S L 2017 Rep. Prog. Phys. 80 076201Google Scholar

    [6]

    Dong Y, Faessler A, Lyubovitskij V E 2017 Prog. Part. Nucl. Phys. 94 282Google Scholar

    [7]

    Lebed R F, Mitchell R E, Swanson E S 2017 Prog. Part. Nucl. Phys. 93 143Google Scholar

    [8]

    Guo F K, Hanhart C, Meißner U G, Wang Q, Zhao Q, Zou B S 2018 Rev. Mod. Phys. 90 015004Google Scholar

    [9]

    Liu Y R, Chen H X, Chen W, Liu X, Zhu S L 2019 Prog. Part. Nucl. Phys. 107 237Google Scholar

    [10]

    Albuquerque R M, Dias J M, Khemchandani K P, Torres A M, Navarra F S, Nielsen M, Zanetti C M 2019 J. Phys. G 46 093002Google Scholar

    [11]

    Yamaguchi Y, Hosaka A, Takeuchi S, Takizawa M 2020 J. Phys. G 47 053001Google Scholar

    [12]

    Guo F K, Liu X H, Sakai S 2020 Prog. Part. Nucl. Phys. 112 103757Google Scholar

    [13]

    Brambilla N, Eidelman S, Hanhart C, Nefediev A, Shen C P, Thomas C E, Vairo A, Yuan C Z 2020 Phys. Rep. 873 1Google Scholar

    [14]

    Zou B S 2021 Sci. Bull. 66 1258Google Scholar

    [15]

    Wang Q, Hanhart C, Zhao Q 2013 Phys. Rev. Lett. 111 132003Google Scholar

    [16]

    Guo F K, Hanhart C, Meißner U G, Wang Q, Zhao Q 2013 Phys. Lett. B 725 127Google Scholar

    [17]

    Cleven M, Wang Q, Guo F K, Hanhart C, Meißner U G, Zhao Q 2014 Phys. Rev. D 90 074039Google Scholar

    [18]

    Wang Q, Cleven M, Guo F K, Hanhart C, Meißner U G, Wu X G, Zhao Q 2014 Phys. Rev. D 89 034001Google Scholar

    [19]

    Wu X G, Hanhart C, Wang Q, Zhao Q 2014 Phys. Rev. D 89 054038Google Scholar

    [20]

    Chen Y H, Dai L Y, Guo F K, Kubis B 2019 Phys. Rev. D 99 074016Google Scholar

    [21]

    Xue S R, Jing H J, Guo F K, Zhao Q 2018 Phys. Lett. B 779 402Google Scholar

    [22]

    Lu Y, Anwar M N, Zou B S 2017 Phys. Rev. D 96 114022Google Scholar

    [23]

    Qin W, Xue S R, Zhao Q 2017 JPS Conf. Proc. 13 020022Google Scholar

    [24]

    Cleven M, Zhao Q 2017 Phys. Lett. B 768 52Google Scholar

    [25]

    Qin W, Xue S R, Zhao Q 2016 Phys. Rev. D 94 054035Google Scholar

    [26]

    Li G, An C S, Li P Y, Liu D, Zhang X, Zhou Z 2015 Chin. Phys. C 39 063102Google Scholar

    [27]

    Li G, Liu X H 2013 Phys. Rev. D 88 094008Google Scholar

    [28]

    Li X, Voloshin M B 2013 Phys. Rev. D 88 034012Google Scholar

    [29]

    Dong X K, Lin Y H, Zou B S 2020 Phys. Rev. D 101 076003Google Scholar

    [30]

    Cao Z, Zhao Q 2019 Phys. Rev. D 99 014016Google Scholar

    [31]

    Sanchez M, Geng L S, Lu J X, Hyodo T, Valderrama M P 2018 Phys. Rev. D 98 054001Google Scholar

    [32]

    Wang Q 2014 Phys. Rev. D 89 114013Google Scholar

    [33]

    Ji T, Dong X K, Guo F K, Zou B S 2022 Phys. Rev. Lett. 129 102002Google Scholar

    [34]

    Mizuk R, Bondar A, Adachi I, et al. 2021 JHEP 06 137Google Scholar

    [35]

    Du M L, Meißner U G, Wang Q 2016 Phys. Rev. D 94 096006Google Scholar

    [36]

    Voloshin M B 2012 Phys. Rev. D 85 034024Google Scholar

    [37]

    Du M L, Baru V, Guo F K, Hanhart C, Meißner U G, Oller J A, Wang Q 2020 Phys. Rev. Lett. 124 072001Google Scholar

    [38]

    Du M L, Baru V, Guo F K, Hanhart C, Meißner U G, Oller J A, Wang Q 2021 JHEP 08 157Google Scholar

    [39]

    Baru V, Epelbaum E, Filin A A, Hanhart C, Nefediev A V, Wang Q 2019 Phys. Rev. D 99 094013Google Scholar

    [40]

    Wang Q, Baru V, Filin A A, Hanhart C, Nefediev A V, Wynen J L 2018 Phys. Rev. D 98 074023Google Scholar

    [41]

    Workman R L, Burkert V D, Crede V, et al. 2022 PTEP 2022 083CGoogle Scholar

    [42]

    Mizuk R, Bondar A, Adachi I, et al. 2019 JHEP 10 220Google Scholar

    [43]

    Wang Q, Liu X H, Zhao Q 2011 Phys. Rev. D 84 014007Google Scholar

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出版历程
  • 收稿日期:  2023-05-31
  • 修回日期:  2023-10-15
  • 上网日期:  2023-10-19
  • 刊出日期:  2023-10-20

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