- 
								[1]
								S. L. Olsen, T. Skwarnicki, and D. Zieminska, Rev. Mod. Phys., 90(1): 015003 (2018) 
- 
								[2]
								M. Karliner, J. L. Rosner, and T. Skwarnicki, Ann. Rev. Nucl. Part. Sci., 68: 17 (2018) 
- 
								[3]
								Y. R. Liu, H. X. Chen, W. Chen et al., Prog. Part. Nucl. Phys., 107: 237 (2019) 
- 
								[4]
								R. Aaij et al. (LHCb Collaboration), Phys. Rev. Lett., 119(11): 112001 (2017) 
- 
								[5]
								A. De Rujula, H. Georgi, and S. L. Glashow, Phys. Rev. D, 12: 147 (1975) 
- 
								[6]
								B. Silvestre-Brac, Few Body Syst., 20: 1 (1996) 
- 
								[7]
								T. D. Cohen and P. M. Hohler, Phys. Rev. D, 74: 094003 (2006) 
- 
								[8]
								Q. X. Yu and X. H. Guo, Nucl. Phys. B, 947: 114727 (2019) 
- 
								[9]
								J. M. Flynn, E. Hernandez, and J. Nieves, Phys. Rev. D, 85: 014012 (2012) 
- 
								[10]
								X. Z. Weng, X. L. Chen, and W. Z. Deng, Phys. Rev. D, 97(5): 054008 (2018) 
- 
								[11]
								Z. Shah and A. K. Rai, Eur. Phys. J. C, 77(2): 129 (2017) 
- 
								[12]
								D. Ebert, R. N. Faustov, V. O. Galkin et al., Phys. Rev. D, 66: 014008 (2002) 
- 
								[13]
								W. Roberts and M. Pervin, Int. J. Mod. Phys. A, 23: 2817 (2008) 
- 
								[14]
								A. Valcarce, H. Garcilazo, and J. Vijande, Eur. Phys. J. A, 37: 217 (2008) 
- 
								[15]
								M. Karliner and J. L. Rosner, Phys. Rev. D, 90(9): 094007 (2014) 
- 
								[16]
								L. Y. Xiao, Q. F. Lü, and S. L. Zhu, Phys. Rev. D, 97(7): 074005 (2018) 
- 
								[17]
								L. Meng, H. S. Li, Z. W. Liu et al., Eur. Phys. J. C, 77(12): 869 (2017) 
- 
								[18]
								R. Dutta and A. Bhol, Phys. Rev. D, 96(7): 076001 (2017) 
- 
								[19]
								T. M. Aliev and S. Bilmis, Nucl. Phys. A, 984: 99 (2019) 
- 
								[20]
								M. Karliner and J. L. Rosner, Phys. Rev. D, 97(9): 094006 (2018) 
- 
								[21]
								J. Vijande, A. Valcarce, and H. Garcilazo, Phys. Rev. D, 91(5): 054011 (2015) 
- 
								[22]
								K. W. Wei, B. Chen, N. Liu et al., Phys. Rev. D, 95(11): 116005 (2017) 
- 
								[23]
								Z. Shah and A. K. Rai, Eur. Phys. J. A, 53(10): 195 (2017) 
- 
								[24]
								G. Yang, J. Ping, P. G. Ortega et al., Chin. Phys. C, 44: 023102 (2020) 
- 
								[25]
								Z. Shah and A. K. Rai, Few Body Syst., 59(5): 76 (2018) 
- 
								[26]
								M. Radin, S. Babaghodrat, and M. Monemzadeh, Phys. Rev. D, 90(4): 047701 (2014) 
- 
								[27]
								T. M. Aliev, K. Azizi, and M. SavcI, J. Phys. G, 41: 065003 (2014) 
- 
								[28]
								S. Meinel, Phys. Rev. D, 85: 114510 (2012) 
- 
								[29]
								S. Meinel, Phys. Rev. D, 82: 114514 (2010) 
- 
								[30]
								M. Padmanath, R. G. Edwards, N. Mathur et al., Phys. Rev. D, 90(7): 074504 (2014) 
- 
								[31]
								Q. S. Zhou, K. Chen, X. Liu et al., Phys. Rev. C, 98(4): 045204 (2018) 
- 
								[32]
								S. Y. Li, Y. R. Liu, Y. N. Liu et al., Eur. Phys. J. C, 79(1): 87 (2019) 
- 
								[33]
								Y. J. Shi, W. Wang, Y. Xing et al., Eur. Phys. J. C, 78(1): 56 (2018) 
- 
								[34]
								W. Wang and J. Xu, Phys. Rev. D, 97(9): 093007 (2018) 
- 
								[35]
								X. C. Zheng, C. H. Chang, and Z. Pan, Phys. Rev. D, 93(3): 034019 (2016) 
- 
								[36]
								D. Gamermann, J. Nieves, E. Oset et al., Phys. Rev. D, 81: 014029 (2010) 
- 
								[37]
								S. Weinberg, Phys. Rev., 137: B672 (1965) 
- 
								[38]
								V. Baru, J. Haidenbauer, C. Hanhart et al., Phys. Lett. B, 586: 53 (2004) 
- 
								[39]
								H. Toki, C. Garcia-Recio, and J. Nieves, Phys. Rev. D, 77: 034001 (2008) 
- 
								[40]
								A. Pilloni, talk at the MIAPP Workshop, Munchen, October 2019. http://www.munich-iapp.de/programmes-topical-workshops/2019/hadron-spectroscopy/daily-schedule-neu/?L=%2Fproc%2Fse 
- 
								[41]
								R. Aaij et al. (LHCb Collaboration), Phys. Rev. Lett., 122(22): 222001 (2019) 
- 
								[42]
								H. X. Chen, W. Chen, and S. L. Zhu, Phys. Rev. D, 100(5): 051501 (2019) 
- 
								[43]
								M. Z. Liu, Y. W. Pan, F. Z. Peng et al., Phys. Rev. Lett., 122(24): 242001 (2019) 
- 
								[44]
								J. He, Eur. Phys. J. C, 79(5): 393 (2019) 
- 
								[45]
								R. Chen, Z. F. Sun, X. Liu et al., Phys. Rev. D, 100(1): 011502 (2019) 
- 
								[46]
								J. R. Zhang, Eur. Phys. J. C, 79(12): 1001 (2019) 
- 
								[47]
								L. Meng, B. Wang, G. J. Wang et al., Phys. Rev. D, 100(1): 014031 (2019) 
- 
								[48]
								M. B. Voloshin, Phys. Rev. D, 100(3): 034020 (2019) 
- 
								[49]
								Y. Yamaguchi, H. Garcia-Tecocoatzi, A. Giachino et al., arXiv: 1907.04684[hep-ph]. 
- 
								[50]
								Z. G. Wang and X. Wang, arXiv: 1907.04582[hep-ph]. 
- 
								[51]
								M. Pavon Valderrama, Phys. Rev. D, 100(9): 094028 (2019) 
- 
								[52]
								Y. J. Xu, C. Y. Cui, Y. L. Liu et al., arXiv: 1907.05097[hep-ph]. 
- 
								[53]
								M. Z. Liu, T. W. Wu, M. Sanchez Sanchez et al., arXiv: 1907.06093[hep-ph]. 
- 
								[54]
								T. J. Burns and E. S. Swanson, Phys. Rev. D, 100(11): 114033 (2019), arXiv:1908.03528[hep-ph 
- 
								[55]
								Y. H. Lin and B. S. Zou, Phys. Rev. D, 100(5): 056005 (2019) 
- 
								[56]
								Y. Yamaguchi, A. Hosaka, S. Takeuchi et al., arXiv: 1908.08790[hep-ph]. 
- 
								[57]
								C. W. Xiao, J. Nieves, and E. Oset, Phys. Rev. D, 100(1): 014021 (2019) 
- 
								[58]
								J. J. Wu, R. Molina, E. Oset et al., Phys. Rev. Lett., 105: 232001 (2010) 
- 
								[59]
								R. Aaij et al. (LHCb Collaboration), Phys. Rev. Lett., 118(18): 182001 (2017) 
- 
								[60]
								G. Montana, A. Feijoo, and A. Ramos, Eur. Phys. J. A, 54(4): 64 (2018) 
- 
								[61]
								V. R. Debastiani, J. M. Dias, W. H. Liang et al., Phys. Rev. D, 97(9): 094035 (2018) 
- 
								[62]
								J. Nieves, R. Pavao, and L. Tolos, Eur. Phys. J. C, 78(2): 114 (2018) 
- 
								[63]
								M. Tanabashi et al. (Particle Data Group), Phys. Rev. D, 98(3): 030001 (2018) 
- 
								[64]
								R. Aaij et al. (LHCb Collaboration), Phys. Rev. Lett., 121(7): 072002 (2018) 
- 
								[65]
								Q. X. Yu, R. Pavao, V. R. Debastiani et al., Eur. Phys. J. C, 79(2): 167 (2019) 
- 
								[66]
								Q. X. Yu, J. M. Dias, W. H. Liang et al., Eur. Phys. J. C, 79(12): 1025 (2019) 
- 
								[67]
								H. X. Chen, W. Chen, X. Liu et al., Phys. Rept., 639: 1 (2016) 
- 
								[68]
								H. X. Chen, W. Chen, X. Liu et al., Rept. Prog. Phys., 80(7): 076201 (2017) 
- 
								[69]
								A. Esposito, A. Pilloni, and A. D. Polosa, Phys. Rept., 668: 1 (2017) 
- 
								[70]
								A. Hosaka, T. Iijima, K. Miyabayashi et al., PTEP, 2016(6): 062C01 (2016) 
- 
								[71]
								J. M. Richard, Few Body Syst., 57(12): 1185 (2016) 
- 
								[72]
								R. F. Lebed, R. E. Mitchell, and E. S. Swanson, Prog. Part. Nucl. Phys., 93: 143 (2017) 
- 
								[73]
								Y. Dong, A. Faessler, and V. E. Lyubovitskij, Prog. Part. Nucl. Phys., 94: 282 (2017) 
- 
								[74]
								F. K. Guo, C. Hanhart, U. G. Meißner et al., Rev. Mod. Phys., 90(1): 015004 (2018) 
- 
								[75]
								A. Ali, J. S. Lange, and S. Stone, Prog. Part. Nucl. Phys., 97: 123 (2017) 
- 
								[76]
								E. Kou et al. (Belle-II Collaboration), PTEP, 12: 123C01 (2019) 
- 
								[77]
								Y. S. Kalashnikova and A. V. Nefediev, Phys. Usp., 62(6): 568 (2019) 
- 
								[78]
								N. Brambilla, S. Eidelman, C. Hanhart et al., arXiv: 1907.07583[hep-ex] 
- 
								[79]
								G. Ecker, J. Gasser, H. Leutwyler et al., Phys. Lett. B, 223: 425 (1989) 
- 
								[80]
								M. Bando, T. Kugo, S. Uehara et al., Phys. Rev. Lett., 54: 1215 (1985) 
- 
								[81]
								M. Bando, T. Kugo, and K. Yamawaki, Phys. Rept., 164: 217 (1988) 
- 
								[82]
								U. G. Meißner, Phys. Rept., 161: 213 (1988) 
- 
								[83]
								H. Nagahiro, L. Roca, A. Hosaka et al., Phys. Rev. D, 79: 014015 (2009) 
- 
								[84]
								W. H. Liang, C. W. Xiao, and E. Oset, Phys. Rev. D, 89(5): 054023 (2014) 
- 
								[85]
								S. Sakai, L. Roca, and E. Oset, Phys. Rev. D, 96(5): 054023 (2017) 
- 
								[86]
								A. Bramon, A. Grau, and G. Pancheri, Phys. Lett. B, 283: 416 (1992) 
- 
								[87]
								F. E. Close, “An Introduction to Quarks and Partons”, Academic Press, Cambrige, 1979 
- 
								[88]
								C. Albertus, E. Hernandez, J. Nieves et al., Eur. Phys. J. A 32, 183(2007), Erratum: [Eur. Phys. J. A 36, 119(2008)] 
- 
								[89]
								J. M. Dias, V. R. Debastiani, J.-J. Xie et al., Phys. Rev. D, 98(9): 094017 (2018)