17 [66] P. J. Sutton, A. D. Martin, R. G. Roberts, and W. J. Stirling, Phys. Rev. D45 , 2349 (1992). [64] D. Brommel, Ph.D. thesis, University of Regensburg, Regensburg, Germany (2007), dESY-THESIS-2007-023. [63] D. Brommel et al. (QCDSF) (2007), arXiv:0708.2249 [hep-lat]. [65] W. Broniowski and E. R. Arriola, Phys. Rev. D79 , 057501 (2009), 0901.3336. [62] P. Carruthers, Phys. Rept. 1 , 1 (1971). [61] J. R. Ellis and J. Lanik, Phys. Lett. B150 , 289 (1985). [60] R. Gomm, P. Jain, R. Johnson, and J. Schechter, Phys. Rev. D33 , 801 (1986). [59] A. A. Migdal and M. A. Shifman, Phys. Lett. B114 , 445 (1982). [58] J. Schechter, Phys. Rev. D21 , 3393 (1980). [57] C. G. J. Callan, S. R. Coleman, and R. Jackiw, Ann. Phys. 59 , 42 (1970). [56] S. Narison and G. Veneziano, Int. J. Mod. Phys. A4 , 2751 (1989). [55] J. F. Donoghue and H. Leutwyler, Z. Phys. C52 , 343 (1991). [54] S. Narison, Nucl. Phys. B509 , 312 (1998), hep- ph/9612457. [53] C. A. Dominguez and N. Paver, Z. Phys. C31 , 591 (1986). [52] P. Pascual and R. Tarrach, Phys. Lett. B113 , 495 (1982). [51] V. A. Novikov, M. A. Shifman, A. I. Vainshtein, and V. I. Zakharov, Nucl. Phys. B191 , 301 (1981). [50] V. A. Novikov, M. A. Shifman, A. I. Vainshtein, and V. I. Zakharov, Nucl. Phys. B165 , 67 (1980). [49] J. C. Collins, A. Duncan, and S. D. Joglekar, Phys. Rev. D16 , 438 (1977). [48] S. S. Afonin, A. A. Andrianov, V. A. Andrianov, and D. Espriu, AIP Conf. Proc. 1030 , 177 (2008). [47] T. Gherghetta, J. I. Kapusta, and T. M. Kelley, Phys. Rev. D79 , 076003 (2009), 0902.1998. [46] F. Zuo and T. Huang (2008), 0801.1172. [45] S. S. Afonin, A. A. Andrianov, V. A. Andrianov, and D. Espriu, AIP Conf. Proc. 1030 , 177 (2008). [44] P. Colangelo, F. De Fazio, F. Giannuzzi, F. Jugeau, and S. Nicotri, Phys. Rev. D78 , 055009 (2008), 0807.1054. [43] H. Forkel, Phys. Rev. D78 , 025001 (2008), 0711.1179. [42] P. Colangelo, F. De Fazio, F. Jugeau, and S. Nicotri, Phys. Lett. B652 , 73 (2007), hep-ph/0703316. [41] A. C. Cordon and E. R. Arriola (2009), 0905.4933. [40] Y. S. Surovtsev, P. Bydzovsky, R. Kaminski, and M. Nagy (2008), 0811.0906. [39] W. de Paula and T. Frederico (2009), 0908.4282. [38] V. V. Anisovich, Int. J. Mod. Phys. A21 , 3615 (2006), hep-ph/0510409. [37] A. V. Anisovich, V. V. Anisovich, and A. V. Sarantsev, Phys. Rev. D62 , 051502 (2000), hep-ph/0003113. [36] C. Amsler et al. (Particle Data Group), Phys. Lett. B667 , 1 (2008). [35] F. Sannino and J. Schechter, Phys. Rev. D76 , 014014 (2007), 0704.0602. [34] E. B. Kiritsis and J. Papavassiliou, Phys. Rev. D42 , 4238 (1990). [33] E. Corrigan and P. Ramond, Phys. Lett. B87 , 73 (1979). [32] J. Nieves and E. Ruiz Arriola, Phys. Lett. B679 , 449 (2009), 0904.4590. [31] A. Calle Cordon and E. Ruiz Arriola, Phys. Rev. C80 , 014002 (2009), 0904.0421. [30] M. K. Banerjee, T. D. Cohen, and B. A. Gelman, Phys. Rev. C65 , 034011 (2002), hep-ph/0109274. [29] D. B. Kaplan and A. V. Manohar, Phys. Rev. C56 , 76 (1997), nucl-th/9612021. [28] D. B. Kaplan and M. J. Savage, Phys. Lett. B365 , 244 (1996), hep-ph/9509371. [27] A. Calle Cordon and E. Ruiz Arriola, AIP Conf. Proc. 1030 , 334 (2008), 0804.2350. [26] J. Nieves and E. Ruiz Arriola, Nucl. Phys. A679 , 57 (2000), hep-ph/9907469. [25] M. Harada, F. Sannino, and J. Schechter, Phys. Rev. D69 , 034005 (2004), hep-ph/0309206. [24] J. Nieves, M. Pavon Valderrama, and E. Ruiz Arriola, Phys. Rev. D65 , 036002 (2002), hep-ph/0109077. [23] J. R. Pelaez and G. Rios, Phys. Rev. Lett. 97 , 242002 (2006), hep-ph/0610397. [22] J. R. Pelaez, Phys. Rev. Lett. 92 , 102001 (2004), hep- ph/0309292. [21] F. Sannino and J. Schechter, Phys. Rev. D52 , 96 (1995), hep-ph/9501417. [20] M. Teper (2008), 0812.0085. [19] E. Witten, Nucl. Phys. B160 , 57 (1979). [18] G. ’t Hooft, Nucl. Phys. B72 , 461 (1974). [17] R. Kaminski, G. Mennessier, and S. Narison, Phys. Lett. B680 , 148 (2009), 0904.2555. [16] A. H. Fariborz, R. Jora, and J. Schechter, Phys. Rev. D79 , 074014 (2009), 0902.2825. [15] G. ’t Hooft, G. Isidori, L. Maiani, A. D. Polosa, and V. Riquer, Phys. Lett. B662 , 424 (2008), 0801.2288. [14] J. Nieves and E. R. Arriola, Phys. Rev. D80 , 045023 (2009), 0904.4344. [13] R. Kaminski, J. R. Pelaez, and F. J. Yndurain, Phys. Rev. D77 , 054015 (2008), 0710.1150. [12] I. Caprini, G. Colangelo, and H. Leutwyler, Phys. Rev. Lett. 96 , 132001 (2006), hep-ph/0512364. [11] E. van Beveren, F. Kleefeld, G. Rupp, and M. D. Scadron, Mod. Phys. Lett. A17 , 1673 (2002), hep- ph/0204139. [10] W. M. Yao et al. (Particle Data Group), J. Phys. G33 , 1 (2006). [9] N. A. Tornqvist and M. Roos, Phys. Rev. Lett. 76 , 1575 (1996), hep-ph/9511210. [8] J. Gasser and H. Leutwyler, Ann. Phys. 158 , 142 (1984). [7] S. Weinberg, Phys. Rev. 166 , 1568 (1968). [6] M. Gell-Mann and M. Levy, Nuovo Cim. 16 , 705 (1960). [5] R. Machleidt, Phys. Rev. C63 , 024001 (2001), nucl- th/0006014. [4] M. H. Johnson and E. Teller, Phys. Rev. 98 , 783 (1955). [3] N. N. Achasov and G. N. Shestakov (2009), 0905.2017. [2] G. Rupp, E. van Beveren, P. Bicudo, B. Hiller, and F. Kleefeld, eds., SCADRON70: Workshop on Scalar Mesons and Related Topics Honoring Michael Scadron’s 70th Birthday , vol. 1030 of American Institute of Physics Conference Series (2008). [1] E. Klempt and A. Zaitsev, Phys. Rept. 454 , 1 (2007), 0708.4016.