- 
								[1]
								M. Ablikim et al., Phys. Rev. Lett. 126(10), 102001 (2021), arXiv:2011.07855 
- 
								[2]
								Y. Cui, X.-L. Chen, W.-Z. Deng et al., HEPNP 31, 7 (2007) 
- 
								[3]
								Z.-G. Wang, Phys. Rev. D 79, 094027 (2009) 
- 
								[4]
								J. M. Dias, X. Liu, and M. Nielsen, Phys. Rev. D 88, 096014 (2013) 
- 
								[5]
								Z.-Y. Di, Z.-G. Wang, J.-X. Zhang et al., Commun. Theor. Phys. 69, 191 (2018) 
- 
								[6]
								Z.-G. Wang, Eur. Phys. J. C 70, 139 (2010) 
- 
								[7]
								Z.-G. Wang, J. Phys. G 36, 085002 (2009) 
- 
								[8]
								K. Azizi and N. Er, Eur. Phys. J. C 81, 61 (2021) 
- 
								[9]
								J. Y. Süngü, A. Türkan, H. Sundu et al., arXiv: 2011.13013 
- 
								[10]
								Z.-G. Wang, Chin. Phys. C 45(7), 073107 (2021) 
- 
								[11]
								D.-Y. Chen, X. Liu, and T. Matsuki, Phys. Rev. Lett. 110, 232001 (2013) 
- 
								[12]
								S. H. Lee, M. Nielsen, and U. Wiedner, J. Korean Phys. Soc. 55, 424 (2009) 
- 
								[13]
								Z.-Y. Di, Z.-G. Wang, and G.-L. Yu, Commun. Theor. Phys. 71, 685 (2019) 
- 
								[14]
								H.-X. Chen, W. Chen, J. He et al., PoS INPC 2016, 374 (2016) 
- 
								[15]
								H. X. Chen, W. Chen, X. Liu et al., Phys. Rept. 639, 1-121 (2016) 
- 
								[16]
								R. F. Lebed, R. E. Mitchell, and E. S. Swanson, Prog. Part. Nucl. Phys. 93, 143 (2017) 
- 
								[17]
								F.-K. Guo, C. Hanhart, U.-G. Meißner et al., Rev. Mod. Phys. 90, 015004 (2018) 
- 
								[18]
								Y.-R. Liu, H.-X. Chen, W. Chen et al., Prog. Part. Nucl. Phys. 107, 237 (2019) 
- 
								[19]
								N. Brambilla et al., Phys. Rept. 873, 1 (2020) 
- 
								[20]
								Z. Yang, X. Cao, F.-K. Guo et al., Phys. Rev. D 103(7), 074029 (2021), arXiv:2011.08725 
- 
								[21]
								L. Meng, B. Wang, and S.-L. Zhu, Phys. Rev. D 102(11), 111502 (2020), arXiv:2011.08656 
- 
								[22]
								M.-Z. Liu, J.-X. Lu, T.-W. Wu et al., arXiv: 2011.08720 
- 
								[23]
								R. Chen and Q. Huang, Phys. Rev. D 103(3), 034008 (2021), arXiv:2011.09156 
- 
								[24]
								Z.-F. Sun and C.-W. Xiao, arXiv: 2011.09404 
- 
								[25]
								U. Özdem and K. Azizi, arXiv: 2102.09231 
- 
								[26]
								Y.-J. Xu, Y.-L. Liu, C.-Y. Cui et al., arXiv: 2011.14313 
- 
								[27]
								M.-J. Yan, F.-Z. Peng, M. S. Sánchez et al., arXiv: 2102.13058 
- 
								[28]
								M. Ablikim et al., Phys.Rev.Lett. 110, 252001 (2013) 
- 
								[29]
								B.-D. Wan and C.-F. Qiao, Nucl. Phys. B 968, 115450 (2021), arXiv:2011.08747 
- 
								[30]
								J.-Z. Wang, Q.-S. Zhou, X. Liu et al., Eur. Phys. J. C 81(1), 51 (2021), arXiv:2011.08628 
- 
								[31]
								M.-C. Du, Q. Wang, and Q. Zhao, arXiv: 2011.09225 
- 
								[32]
								X. Cao, J.-P. Dai, and Z. Yang, Eur. Phys. J. C 81(2), 184 (2021), arXiv:2011.09244 
- 
								[33]
								X. Chen, Y. Tan, and Y. Chen, arXiv: 2103.07347 
- 
								[34]
								X. Jin, X. Liu, Y. Xue et al., arXiv: 2011.12230 
- 
								[35]
								P.-P. Shi, F. Huang, and W.-L. Wang, Phys. Rev. D 103(9), 094038 (2021), arXiv:2105.02397 
- 
								[36]
								Z.-H. Guo and J. A. Oller, Phys. Rev. D 103, 054021 (2021) 
- 
								[37]
								N. Ikeno, R. Molina, and E. Oset, Physics Letters B 814, 136120 (2021) 
- 
								[38]
								L. Meng, G.-J. Wang, B. Wang et al., arXiv: 2104.08469 
- 
								[39]
								Y. A. Simonov, JHEP 04, 051 (2021) 
- 
								[40]
								M. A. Shifman, A. I. Vainshtein, and V. I. Zakharov, Nucl. Phys. B 147, 385 (1979) 
- 
								[41]
								L. J. Reinders, H. Rubinstein, and S. Yazaki, Phys. Rept. 127, 1 (1985) 
- 
								[42]
								P. Colangelo and A. Khodjamirian, Frontier of Particle Physics 3(2000) 
- 
								[43]
								R. M. Albuquerque, S. Narison, and D. Rabetiarivony, Phys. Rev. D 103(7), 074015 (2021), arXiv:2101.07281 
- 
								[44]
								Q.-N. Wang and W. Chen, Eur. Phys. J. C 80, 389 (2020) 
- 
								[45]
								S. Narison, World Sci. Lect. Notes Phys. 26, 1-527 (1989) 
- 
								[46]
								M. Jamin, J. A. Oller, and A. Pich, Eur. Phys. J. C 24, 237 (2002) 
- 
								[47]
								M. Jamin and A. Pich, Nucl. Phys. Proc. Suppl. 74, 300 (1999) 
- 
								[48]
								B. L. Ioffe, Nucl. Phys. B 188, 317-341 (1981) 
- 
								[49]
								Y. Chung, H. G. Dosch, M. Kremer et al., Z. Phys. C 25, 151 (1984) 
- 
								[50]
								H. G. Dosch, M. Jamin, and S. Narison, Phys. Lett. B 220, 251-257 (1989) 
- 
								[51]
								A. Khodjamirian, T. Mannel, N. Offenet al., Phys. Rev. D 83, 094031 (2011) 
- 
								[52]
								M. Tanabashi et al., Phys. Rev. D 98, 030001 (2018) 
- 
								[53]
								A. Francis, R. J. Hudspith, R. Lewis et al., Phys. Rev. D 99, 054505 (2019) 
- 
								[54]
								M. Nielsen, F. S. Navarra, and S. H. Lee, Phys. Rept. 497, 41-83 (2010) 
- 
								[55]
								Z. G. Wang, Phys. Rev. D 101(7), 074011 (2020) 
- 
								[56]
								R. Aaij et al. (LHCb), arXiv: 2103.01803