LETTERE AL NUOVO CI]K]~NTO VOL. 22, ~. 5 3 Giugno 1978 Hadrons as Compounds of Bradyon Particles and Tachyons (*). 1 :). CASTORINA Scuola di Specializzazione in Fieica, U~vive~sit5 di Catania - Catania, Italia E. RV.CA~I Istituto di Fisica Teorica, Universit~ di Catania - Catania, Italia Istituto Nazionale di Fisica Nucleate - Sezione di Catania, Catania Centre Sieiliano di Fisica Nucleare e di Struttuva della Materia - Catania (ricevuto 1'1 Febbraio 1978) Since a decade (~) it has been suggested that virtual partivles (~) (having negative (8) four-momentum squares: p~ < 0) can be classically interpreted in terms of tachyons (~.~). In particular, resonances were proposed to be composed of bradyons and taehyons (~.~). More generally, the possible rSle of tachyons in hadron structure has been in the past frequently stressed (~). Very recently, CORB~.:~ (~) started---~thin ((extended relativity~ (7)--from the known fact (s) that a free bradyon (= slower-than-light particle) of mass mz and a (*) Work partially sypported by MPI, ex-art. 286 T.U. (~) E. REC~'~I: Possible ... and comments on tachyons, virtual particles, resonances, Report IFUl~-088S.~I, University of Milano (August 1968), pages 4-8; G4ornale di Fisica, 10, 195 (1969), pages 203-205; V. S. OLKIIO~KY and E. RECAMI: NUoVO Cimento, 63 A, 814 (1962), page 822. See also ref. (4). (') See, e.g., F. T. HADJIOAh'lVOU: NUOVO Cimento, 44, 185 (1966); I. FERRETTI and M. VERDE: Atti Accad. Scienze Torino (1966), Page 318. (') Let us choose the signature (+ -----). Natural units will be adopted when convenient. (4) See also, E. C. G. SUDARSr~A~': Ark. Phys., 39 (40), 5 5 (1969); Phys. ReD. D, 1, 2428 (1970); A. ~. GLEESON, ~. G. GUNDZIO, E. C. G. SuD~RSHA.'~" and A. PAGN~MEh'TA: Particles and Nuclei, 1, 1 (1970); Phys. ReD. •, 6, 807 (1972); E. VAN DER SPUY: Phys. ReD. D, 7, 1106 (1973); C. JUE: Phys. ReD. D, 8, 1757 (1973). (5) M. B~oo and E. REc~I: Let~.Nuovo Cimvnto, 2, 643 (1969 ), page 646; R.,~IG~-A~'IandE. RECA)II: Nuovo Cimento, 30 A, 533 (1975), sect. 4, pages 538-539; Phys. LeAr., 65 B, 149 (1976), footnotes at page 149; E. I~EO~_'~I and R. M-IGNANI: Phys. Le2t., 62 B, 41 (1976), page 43; E. REC~II, 1~. MIO~-ANI and G. ZHNO: in Recent Development in Relativistic Q.F.T. and its Application, Vo]. 2 (Wroclaw, 1977), p. 269; 1~I. PAv~IO and E. RnCA)iI: Nuovo Cimento, 36 A, 171 (1976), particularly footnotes (~,~,~). (') H. C. CORBEN: LetL Nuovo Cimento, 20, 645 (1977); three preprint~, Scarborough College, West Hill, Ontario (August, September and November 1977), submitted for publication; and in Tachyons, monopoles, and Related Topics, edited by E. REC~.~I (Amsterdam, 1978), to appear. (') E. REOA.'4~ and R. ~II(~.~A~I: Rfv. Nuovo Cimento, 4, 209-29{), 398 (1974) and references therein. See also the volume Tachyons, monopoles, and Related Topics, edited by E. REC~--MI (Amsterdam, 1978), to appear. (~) See also, M. BALDO and E. RECA~: Le2t. Nuovo Citnen~o, 2, 643 (1969), page 646; E. RECA.MI: iu Tachyons, monopoles, an~ Relateel Topics, edited by E. R~c~ti (Amsterdam, 1978), to appear. 195