| [1] | J.J. Aubert et al (E598), Phys. Rev. Lett., 33:1404 (1974) | 
	
			| [2] | J.E. Augustin et al (SLAC-SP-017), Phys. Rev. Lett., 33:1406 (1974) | 
	
			| [3] | N. Brambilla, S. Eidelman, B. Heltsley, R. Vogt, G. Bodwin et al, Eur. Phys. J. C, 71:1534 (2011) | 
	
			| [4] | C. Patrignani, P. D. Group, Chinese Physics C, 40:100001 (2016) | 
	
			| [5] | J. Siegrist et al, Phys. Rev. Lett., 36:700 (1976) | 
	
			| [6] | R. Brandelik et al (DASP), Phys. Lett. B, 76:361 (1978) | 
	
			| [7] | E. Eichten, K. Gottfried, T. Kinoshita, K. D. Lane, and T. M. Yan, Phys. Rev. D, 21:203 (1980) | 
	
			| [8] | R. Aaij et al (LHCb), Phys. Rev. Lett., 111:101805 (2013) | 
	
			| [9] | X. L. Wang et al (Belle), Phys. Rev. Lett., 99:142002 (2007) | 
	
			| [10] | G. Pakhlova et al (Belle), Phys. Rev. Lett., 101:172001 (2008) | 
	
			| [11] | P. A. Rapidis et al, Phys. Rev. Lett., 39:526 (1977) | 
	
			| [12] | W. Bacino et al, Phys. Rev. Lett., 40:671 (1978) | 
	
			| [13] | G. S. Abrams et al, Phys. Rev. D, 21:2716 (1980) | 
	
			| [14] | M. Ablikim et al (BES), Phys. Lett. B, 652:238 (2007) | 
	
			| [15] | V. V. Anashin et al, Phys. Lett. B, 711:292 (2012) | 
	
			| [16] | K. Abe et al (Belle), Phys. Rev. Lett., 98:082001 (2007) | 
	
			| [17] | P. Pakhlov et al (Belle), Phys. Rev. Lett., 100:202001 (2008) | 
	
			| [18] | W. Sreethawong, K. Xu, Y. Yan (2013), 1306.2780 | 
	
			| [19] | Z. H. Wang, Y. Zhang, L. Jiang, T. H. Wang, Y. Jiang, and G. L. Wang, Eur. Phys. J. C, 77(1):43 (2017) | 
	
			| [20] | V. Bhardwaj et al (Belle), Phys. Rev. Lett., 111(3):032001 (2013) | 
	
			| [21] | M. Ablikim et al (BESⅢ), Phys. Rev. Lett., 115(1):011803 (2015) | 
	
			| [22] | S. K. Choi et al (Belle), Phys. Rev. Lett., 91:262001 (2003) | 
	
			| [23] | D. Acosta et al (CDF), Phys. Rev. Lett., 93:072001 (2004) | 
	
			| [24] | V.M. Abazov et al (D0), Phys. Rev. Lett., 93:162002 (2004) | 
	
			| [25] | B. Aubert et al (BaBar), Phys. Rev. D, 71:071103 (2005) | 
	
			| [26] | S.K. Choi et al, Phys. Rev. D, 84:052004 (2011) | 
	
			| [27] | T. Aaltonen et al (CDF), Phys. Rev. Lett., 103:152001 (2009) | 
	
			| [28] | B. Aubert et al (BaBar), Phys. Rev. D, 77:111101 (2008) | 
	
			| [29] | A. Abulencia et al (CDF), Phys. Rev. Lett., 98:132002 (2007) | 
	
			| [30] | M. Ablikim et al (BESⅢ), Phys. Rev. Lett., 112(9):092001 (2014) | 
	
			| [31] | T. Barnes, S. Godfrey, Phys. Rev. D, 69:054008 (2004) | 
	
			| [32] | S. K. Choi et al (Belle Collaboration), Phys. Rev. Lett., 94:182002 (2005) | 
	
			| [33] | P. del Amo Sanchez et al (BaBar), Phys. Rev. D, 82:011101 (2010) | 
	
			| [34] | J.P. Lees et al (BaBar), Phys. Rev. D, 86:072002 (2012), 1207.2651 | 
	
			| [35] | X. Liu, Z. G. Luo, and Z. F. Sun, Phys. Rev. Lett., 104:122001 (2010) | 
	
			| [36] | Z. Y. Zhou, Z. Xiao, and H. Q. Zhou, Phys. Rev. Lett., 115(2):022001 (2015) | 
	
			| [37] | S. Uehara et al (Belle), Phys. Rev. Lett., 96:082003 (2006) | 
	
			| [38] | B. Aubert et al (BaBar), Phys. Rev. D, 81:092003 (2010) | 
	
			| [39] | M. Ablikim et al (BESⅢ), Phys. Rev. Lett., 110:252001 (2013) | 
	
			| [40] | Z. Q. Liu et al (Belle), Phys. Rev. Lett., 110:252002 (2013) | 
	
			| [41] | T. Xiao, S. Dobbs, A. Tomaradze, and K. K. Seth, Phys. Lett. B, 727:366 (2013) | 
	
			| [42] | M. Ablikim et al (BESⅢ), Phys. Rev. D, 92(9):092006 (2015) | 
	
			| [43] | T. Aaltonen et al (CDF), Phys. Rev. Lett., 102:242002 (2009) | 
	
			| [44] | S. Chatrchyan et al (CMS), Phys. Lett. B, 734:261 (2014) | 
	
			| [45] | V.M. Abazov et al (D0), Phys. Rev. Lett., 115(23):232001 (2015) | 
	
			| [46] | V.M. Abazov et al (D0), Phys. Rev. D, 89(1):012004 (2014) | 
	
			| [47] | X. Liu, S. L. Zhu, Phys. Rev. D, 80:017502 (2009); Phys. Rev.D, 85:019902 (2012) | 
	
			| [48] | T. Branz, T. Gutsche, and V. E. Lyubovitskij, Phys. Rev. D, 80:054019 (2009) | 
	
			| [49] | R. M. Albuquerque, M. E. Bracco, M. Nielsen, Phys. Lett. B, 678:186 (2009) | 
	
			| [50] | G. J. Ding, Eur. Phys. J. C, 64:297 (2009) | 
	
			| [51] | F. Stancu, J. Phys. G, 37:075017 (2010) | 
	
			| [52] | Z. G. Wang, Y. F. Tian, Int. J. Mod. Phys. A, 30:1550004 (2015) | 
	
			| [53] | V. V. Anisovich, M. A. Matveev, A. V. Sarantsev, and A. N. Semenova, Int. J. Mod. Phys. A, 30(32):1550186 (2015) | 
	
			| [54] | Z. G. Wang, Eur. Phys. J. C, 63:115 (2009) | 
	
			| [55] | N. Mahajan, Phys. Lett. B, 679:228 (2009) | 
	
			| [56] | R. Aaij et al (LHCb), Phys. Rev. D, 85:091103 (2012) | 
	
			| [57] | J. P. Lees et al (BaBar), Phys. Rev. D, 89(11):112004 (2014) | 
	
			| [58] | T. Aaltonen et al (CDF), Mod. Phys. Lett. A, 32(26):1750139 (2017) | 
	
			| [59] | R. Aaij et al (LHCb), Phys. Rev. D, 95(1):012002 (2017) | 
	
			| [60] | Q. F. L, Y. B. Dong, Phys. Rev. D, 94(7):074007 (2016) | 
	
			| [61] | T. Bhavsar, M. Shah, and P. C. Vinodkumar, Eur. Phys. J. C, 78(3):227 (2018) | 
	
			| [62] | P. Gonzlez, Phys. Rev. D, 92:014017 (2015) | 
	
			| [63] | P. Guo, T. Ypez-Martnez, A. P. Szczepaniak, Phys. Rev. D, 89(11):116005 (2014) | 
	
			| [64] | H. W. Ke, X. Q. Li, and Y. L. Shi, Phys. Rev. D, 87(5):054022 (2013) | 
	
			| [65] | D. Ebert, R. Faustov, and V. Galkin, Mod. Phys. Lett. A, 17:803 (2002) | 
	
			| [66] | N. Brambilla, eConf, C0610161:004 (2006), hep-ph/0702105 | 
	
			| [67] | F. De Fazio, Phys. Rev. D, 79:054015 (2009); Phys. Rev.D, 83:099901 (2011) | 
	
			| [68] | G. C. Donald, C. Davies et al, Phys. Rev. D, 86:094501 (2012), 1208.2855 | 
	
			| [69] | L. Liu, G. Moir, Peardon et al (Hadron Spectrum), JHEP, 07:126 (2012) | 
	
			| [70] | S. L. Zhu, Y. B. Dai, Phys. Rev. D, 59:114015 (1999) | 
	
			| [71] | V. A. Beilin, A. V. Radyushkin, Nucl. Phys.B, 260:61 (1985) | 
	
			| [72] | S. Godfrey, N. Isgur, Phys. Rev. D, 32:189 (1985) | 
	
			| [73] | T. Barnes, S. Godfrey, and E. S. Swanson, Phys. Rev. D, 72:054026 (2005) | 
	
			| [74] | B. Q. Li, C. Meng, and K. T. Chao (2012), 1201.4155 | 
	
			| [75] | B. Q. Li, K. T. Chao, Phys. Rev. D, 79:094004 (2009) | 
	
			| [76] | L. Cao, Y. C. Yang, and H. Chen, Few Body Syst., 53:327 (2012) | 
	
			| [77] | J. Segovia, A. M. Yasser, D. R. Entem, and F. Fernandez, Phys. Rev. D, 78:114033 (2008) | 
	
			| [78] | E. Eichten et al, Phys. Rev. D, 17(11):3090 (1978) | 
	
			| [79] | W. J. Deng, H. Liu, L. C. Gui, X. H. Zhong, Phys. Rev. D, 95(3):034026 (2017) | 
	
			| [80] | S. Godfrey, K. Moats, Phys. Rev. D, 92(5):054034 (2015) | 
	
			| [81] | Y. Koma, M. Koma, H. Wittig, Phys. Rev. Lett, 97:122003 (2006) | 
	
			| [82] | N. Devlani, V. Kher, and A. K. Rai, Eur. Phys. J. A, 50(10):154 (2014) | 
	
			| [83] | V. Kher, N. Devlani, and A. K. Rai, Chinese Physics C, 41(7):073101 (2017), 1704.00439 | 
	
			| [84] | V. Kher, N. Devlani, A.K. Rai, Chinese Physics C, Vol. 41,(No. 9), 093101 (2017) | 
	
			| [85] | N. Brambilla, A. Pineda, J. Soto, and A. Vairo, Rev. Mod. Phys., 77:1423 (2005) | 
	
			| [86] | N. Brambilla et al, Eur. Phys. J. C, 74(10):2981 (2014) | 
	
			| [87] | S. N. Gupta, J. M. Johnson, Phys. Rev. D, 51(1):168 (1995) | 
	
			| [88] | D. S. Hwang, C. Kim, W. Namgung, Phys. Lett. B, 406:117 (1997), hep-ph/9608392 | 
	
			| [89] | A. K. Rai, B. Patel, and P. C. Vinodkumar, Phys. Rev. C, 78(5):055202 (2008) | 
	
			| [90] | A. K. Rai, R. H. Parmar, and P. C. Vinodkumar, J. Phys. G:Nucl. Part. Phys., 28(8):2275 (2002) | 
	
			| [91] | E. Eichten, S. Godfrey, H. Mahlke, and J. L. Rosner, Rev. Mod. Phys., 80:1161 (2008) | 
	
			| [92] | M. B. Voloshin, Prog. Part. Nucl. Phys., 61:455 (2008) | 
	
			| [93] | O. Lakhina, E. S. Swanson, Phys. Rev. D, 74:014012 (2006) | 
	
			| [94] | R. Van Royen, V. Weisskopf, Nuovo Cim. A, 50:617 (1967) | 
	
			| [95] | E. Braaten, S. Fleming, Phys. Rev. D, 52(1):181 (1995) | 
	
			| [96] | D. S. Hwang, G. H. Kim, Phys. Rev. D, 55(11):6944 (1997) | 
	
			| [97] | G. J. Ding, J. J. Zhu, and M. L. Yan, Phys. Rev. D, 77:014033 (2008) | 
	
			| [98] | Q. F. Lu, T. T. Pan, Y. Y. Wang, E. Wang, and D. M. Li, Phys. Rev. D, 94(7):074012 (2016) | 
	
			| [99] | F. K. Guo, C. Hanhart, G. Li, U. G. Meissner, and Q. Zhao, Phys. Rev. D, 82:034025 (2010) | 
	
			| [100] | S. F. Radford, W. W. Repko, M. J. Saelim, Phys. Rev. D, 80(3):034012 (2009) | 
	
			| [101] | J. Segovia, P. G. Ortega, D. R. Entem, and F. Fernndez, Phys. Rev. D, 93(7):074027 (2016) | 
	
			| [102] | W. Kwong, P. B. Mackenzie, R. Rosenfeld, and J. L. Rosner, Phys. Rev. D, 37:3210 (1988) | 
	
			| [103] | W. Kwong, J. L. Rosner, Phys. Rev. D, 38:279 (1988) | 
	
			| [104] | A. Bradley, A. Khare, Z. Phys. C, 8:131 (1981) | 
	
			| [105] | G. Belanger, P. Moxhay, Phys. Lett. B, 199:575 (1987) | 
	
			| [106] | Bhaghyesh, K.B. Vijaya Kumar, and A. P. Monteiro, J. Phys. G, 38:085001 (2011) | 
	
			| [107] | H. Negash, S. Bhatnagar, Int. J. Mod. Phys. E, 25(08):1650059 (2016) | 
	
			| [108] | J. H. Yang, S. K. Lee, E. J. Kim, and J. B. Choi (2015), 1506.04481 | 
	
			| [109] | D. Ebert, R. Faustov, V. Galkin, Eur. Phys. J. C, 71:1825 (2011) | 
	
			| [110] | S. F. Radford, W. W. Repko, Phys. Rev. D, 75:074031 (2007) | 
	
			| [111] | D. Ebert, R. N. Faustov, and V. O. Galkin, Phys. Rev. D, 67:014027 (2003) | 
	
			| [112] | M. A. Sultan, N. Akbar, B. Masud, F. Akram, Phys. Rev. D, 90(5):054001 (2014) | 
	
			| [113] | S. Godfrey, N. Isgur, Phys. Rev. D, 32:189 (1985) | 
	
			| [114] | D. Ebert, R. Faustov, and V. Galkin, Eur. Phys. J. C, 66:197 (2010) | 
	
			| [115] | A. Parmar, B. Patel, and P. Vinodkumar, Nucl. Phys. A, 848:299 (2010) | 
	
			| [116] | N. Brambilla et al (Quarkonium Working Group) (2004), hepph/0412158 | 
	
			| [117] | E. J. Eichten, K. Lane, and C. Quigg, Phys. Rev. Lett., 89:162002 (2002), hep-ph/0206018 | 
	
			| [118] | P. P. D'Souza, M. Bhat, A. P. Monteiro, and K. B. Vijaya Kumar (2017) | 
	
			| [119] | Bhaghyesh, K. B. Vijaya Kumar, and Y. L. Ma, Int. J. Mod. Phys. A, 27:1250011 (2012) | 
	
			| [120] | F. Giannuzzi, Phys. Rev. D, 78:117501 (2008) | 
	
			| [121] | J. T. Laverty, S. F. Radford, and W. W. Repko (2009), 0901.3917 | 
	
			| [122] | C. R. Munz, Nucl. Phys. A, 609:364 (1996) | 
	
			| [123] | C. S. Kim, T. Lee, and G. L. Wang, Phys. Lett. B, 606:323 (2005) | 
	
			| [124] | D. Ebert, R. N. Faustov, V. O. Galkin, Mod. Phys. Lett. A, 18:601 (2003) | 
	
			| [125] | N. A. Tornqvist, Phys. Lett. B, 590:209 (2004) | 
	
			| [126] | E. Braaten, M. Lu, Phys. Rev. D, 76:094028 (2007) | 
	
			| [127] | M. Albaladejo, F. K. Guo, C. Hanhart, U. G. Meiner, J. Nieves, A. Nogga, and Z. Yang, Chin. Phys. C, 41(12):121001 (2017) | 
	
			| [128] | C. Hanhart, Yu. S. Kalashnikova, A. E. Kudryavtsev, and A. V. Nefediev, Phys. Rev. D, 76:034007 (2007) | 
	
			| [129] | L. Maiani, F. Piccinini, A. D. Polosa, and V. Riquer, Phys. Rev. D, 71:014028 (2005), hep-ph/0412098 | 
	
			| [130] | M. Nielsen, S. J. Brodsky (2018), 1802.09652 | 
	
			| [131] | C. W. Zhao, G. Li, X. H. Liu, and F. L. Shao, Eur. Phys. J. C, 73:2482 (2013) | 
	
			| [132] | X. Liu, Z. G. Luo, and Z. F. Sun, Phys. Rev. Lett., 104:122001 (2010) | 
	
			| [133] | F. K. Guo, C. Hanhart, G. Li, U. G. Meissner, and Q. Zhao, Phys. Rev. D, 83:034013 (2011) | 
	
			| [134] | G. Li, Q. Zhao, Phys. Lett. B, 670:55 (2008) | 
	
			| [135] | G. Li, Q. Zhao, Phys. Rev. D, 84:074005 (2011) | 
	
			| [136] | S. S. Afonin, I. V. Pusenkov, EPJ Web Conf., 125:04006 (2016) |