\begin{document}$ \eta_c(2S) $\end{document} and \begin{document}$ \eta_c $\end{document} decays into ten different final states with light hadrons. For the first time, we test the two existing theoretical predictions of these decays and find that the experimental data are significantly different from both of them. The lack of observation of any decay mode with higher rate in \begin{document}$ \eta_c(2S) $\end{document} than in \begin{document}$ \eta_c $\end{document} decays suggests very unusual decay dynamics in pseudoscalar charmonium decays to be identified. We also report the first model-independent evaluation of the partial width of \begin{document}$ \eta_c(2S)\to \gamma\gamma $\end{document} (\begin{document}$ 2.21_{-0.64}^{+0.88} $\end{document} keV) and improve determination of that of \begin{document}$ \eta_c\to \gamma\gamma $\end{document} (\begin{document}$ 5.43_{-0.38}^{+0.41} $\end{document} keV). The latter shows a tension with the most recent lattice QCD calculation."> New puzzle in charmonium decays -
  • [1]

    J. J. Aubertet al. (E598), Phys. Rev. Lett.33, 1404-1406 (1974)

  • [2]

    J. E. Augustinet al. (SLAC-SP-017), Phys. Rev. Lett.33, 1406-1408 (1974)

  • [3]

    N. Brambilla, A. Pineda, J. Sotoet al., Rev. Mod. Phys.77, 1423 (2005)

  • [4]

    N. Brambilla, S. Eidelman, B. K. Heltsleyet al., Eur. Phys. J. C71, 1534 (2011)

  • [5]

    N. Brambilla, S. Eidelman, P. Fokaet al., Eur. Phys. J. C74(10), 2981 (2014)

  • [6]

    E. Eichten, K. Gottfried, T. Kinoshitaet al.,Phys. Rev. D17, 3090 (1978) [Erratum: Phys. Rev. D21, 313 (1980)]

  • [7]

    S. Godfrey and N. Isgur, Phys. Rev. D32, 189-231 (1985)

  • [8]

    T. Barnes, S. Godfrey, and E. S. Swanson, Phys. Rev. D72, 054026 (2005)

  • [9]

    T. Appelquist and H. D. Politzer, Phys. Rev. Lett.34, 43 (1975)

  • [10]

    P. A. Zylaet al. (Particle Data Group), PTEP2020(8), 083C01 (2020)

  • [11]

    M. E. B. Franklinet al., Phys. Rev. Lett.51, 963-966 (1983)

  • [12]

    X. H. Mo, C. Z. Yuan, and P. Wang, Chin. Phys. C31, 686-701 (2007)

  • [13]

    M. Anselmino, M. Genovese, and E. Predazzi, Phys. Rev. D44, 1597-1598 (1991)

  • [14]

    K. T. Chao, Y. F. Gu, and S. F. Tuan, Commun. Theor. Phys.25, 471-478 (1996)

  • [15]

    S. K. Choiet al.(Belle),Phys. Rev. Lett.89, 102001 (2002) [Erratum: Phys. Rev. Lett.89, 129901 (2002)]

  • [16]

    J. Segovia and J. T. Castellà, Phys. Rev. D104(7), 074032 (2021)

  • [17]

    J. Abdallahet al. (DELPHI), Eur. Phys. J. C31, 481-489 (2003)

  • [18]

    D. Cronin-Hennessyet al. (CLEO), Phys. Rev. D81, 052002 (2010)

  • [19]

    S. Ueharaet al. (Belle), Eur. Phys. J. C53, 1-14 (2008)

  • [20]

    Recalculated with data in M. Ablikimet al. (BESIII),Phys. Rev. D86, 092009 (2012) and \begin{document}$ {\cal B}(\psi(2S)\to $\end{document} \begin{document}$ \pi^0 h_c\to \pi^0 \gamma \eta_c) $\end{document} obtained from this paper (Table 2)

  • [21]

    Y. Meng, X. Feng, C. Liuet al., arXiv: 2109.09381 [hep-lat]

  • [22]

    N. Brambilla, H. S. Chung, and J. Komijani, Phys. Rev. D98(11), 114020 (2018)

  • [23]

    R. Chaturvedi and A. K. Rai, Int. J. Theor. Phys.59(11), 3508-3532 (2020)

  • [24]

    W. S. Hou and A. Soni, Phys. Rev. Lett.50, 569 (1983)

  • [25]

    M. Q. Huber, C. S. Fischer, and H. Sanchis-Alepuz, arXiv: 2111.10197 [hep-ph]

  • [26]

    F. Chen, X. Jiang, Y. Chenet al., arXiv: 2111.11929 [hep-lat]

  • [27]

    Y. D. Tsai, H. n. Li, and Q. Zhao, Phys. Rev. D85, 034002 (2012)

  • [28]

    W. Qin, Q. Zhao, and X. H. Zhong, Phys. Rev. D97(9), 096002 (2018)

  • [29]

    R. Zhang, W. Sun, Y. Chenet al., Phys. Lett. B827, 136960 (2022)

  • [30]

    Q. Wang, X. H. Liu, and Q. Zhao, Phys. Lett. B711, 364-370 (2012)

  • [31]

    M. Ablikimet al. (BESIII), Chin. Phys. C44(4), 040001 (2020)

  • [32]

    T. Abeet al.(Belle-II), arXiv: 1011.0352 [physics.ins-det]

  • [33]

    R. Aaijet al.(LHCb), arXiv: 1808.08865 [hep-ex]

  • [34]

    M. Ablikimet al. (BESIII), Phys. Rev. D100(1), 012003 (2019)

  • [35]

    Y. Katoet al. (Belle), Phys. Rev. D97(1), 012005 (2018)

  • [36]

    J. P. Leeset al. (BaBar), Phys. Rev. Lett.124(15), 152001 (2020)

  • [37]

    R. Aaijet al. (LHCb), Eur. Phys. J. C77(9), 609 (2017)

  • [38]

    H. C. Huanget al. (Belle), Phys. Rev. Lett.91, 241802 (2003)

  • [39]

    J. P. Leeset al. (BaBar), Phys. Rev. D89(11), 112004 (2014)

  • [40]

    B. Aubertet al. (BaBar), Phys. Rev. D78, 012006 (2008)

  • [41]

    D. M. Asneret al. (CLEO), Phys. Rev. Lett.92, 142001 (2004)

  • [42]

    M. Ablikimet al. (BESIII), Phys. Rev. D86, 092009 (2012)

  • [43]

    M. Ambrogianiet al. (Fermilab E835), Phys. Lett. B566, 45-50 (2003)

  • [44]

    T. A. Armstronget al. (E760), Phys. Rev. D52, 4839-4854 (1995)

  • [45]

    F. Fanget al. (Belle), Phys. Rev. Lett.90, 071801 (2003)

  • [46]

    B. Aubertet al. (BaBar), Phys. Rev. D72, 051101 (2005)

  • [47]

    C. H. Wuet al. (Belle), Phys. Rev. Lett.97, 162003 (2006)

  • [48]

    I. Adachiet al. (Belle), Phys. Lett. B662, 323-329 (2008)

  • [49]

    B. Aubertet al. (BaBar), Phys. Rev. D70, 011101 (2004)

  • [50]

    A. Vinokurovaet al. (Belle), Phys. Lett. B706, 139-149 (2011)

  • [51]

    K. Chilikinet al. (Belle), Phys. Rev. D100(1), 012001 (2019)

  • [52]

    R. Aaijet al. (LHCb), Phys. Lett. B769, 305-313 (2017)

  • [53]

    M. Ablikimet al. (BESIII), Phys. Rev. Lett.109, 042003 (2012)

  • [54]

    M. Ablikimet al. (BESIII), Phys. Rev. D87(5), 052005 (2013)

  • [55]

    Z. Q. Liuet al. (Belle), Phys. Rev. Lett.108, 232001 (2012)

  • [56]

    C. C. Kuoet al. (Belle), Phys. Lett. B621, 41-55 (2005)

  • [57]

    P. del Amo Sanchezet al. (BaBar), Phys. Rev. D84, 012004 (2011)

  • [58]

    J. P. Leeset al. (BaBar), Phys. Rev. D81, 052010 (2010)

  • [59]

    M. Shiraiet al. (AMY), Phys. Lett. B424, 405-410 (1998)

  • [60]

    H. Nakazawaet al. (Belle), Nucl. Phys. B Proc. Suppl.184, 220-223 (2008)

  • [61]

    Q. N. Xuet al. (Belle), Phys. Rev. D98(7), 072001 (2018)

  • [62]

    R. Aaijet al. (LHCb), Eur. Phys. J. C75(7), 311 (2015)

  • [63]

    M. Ablikimet al. (BESIII), Phys. Rev. Lett.108, 222002 (2012)

Baidu
map