Springer Tracts in Modern Physics, Volume 61 by Dr J. L. Basdevant (auth.)

By Dr J. L. Basdevant (auth.)

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57. : Phys. Rep. : Pad6 approximation in strong interaction physics, Proceedings of the 1970 Carg~se Summer School (to appear). 58. Basdevant, J. , Lee, B. W. : Phys. Rev. D 2, 1680 (1970). 59. , Zinn Justin, J. : Nuovo Cimento 60A, 185 (1969). 60. , Levy, M. :Nuovo Cimento 16, 705 (1960). 61. W. :Nuclear Phys. B9, 649 (1969). 62. Basdevant, J. : Phys. Rev. D3, 1865 (1971). 63. : Ann. Phys. 11, 1 (1961). Dr. J. L. Basdevant CERN CH-1211 Gen+ve 23 The Nucleon Resonances* A. DONNACHIE Contents 1.

A resolution of this point would be valuable in view of the uncertainty about the existence of the D13(1730) in elastic pion nucleon scattering. There is no evidence at all for any contribution from the D15(1670) or the F15(1690). 36 A, Donnachie: Table 2. The N resonances Resonance Status Pii(940) Pi1(1470) D13(1520) Sl1(1540) D15(1670) F15(1690) Sll(1700) D13(1730) Pli(1780) P13(1860) /:1v(1990) Di3(2040) G~7(2190) Hi 9(2250) N(2650) N(3030) Stable Definite Definite Definite Definite Definite Definite Doubtful Probable Possible Possible Possible Definite Definite Conjectured Conjectured Mass range (MeV) Width range (MeV) Inelasticity at resonance 1435-1505 1510-1540 1500-1600 1655-1680 1680-1690 1665-1765 1680-1730 1650 1860 1770-1900 1980-2000 2030- 2060 2000-2260 2200-2245 2650 3030 165-400 105-150 70-160 105-175 105-180 100-400 ?

7r~N decays of N and A resonances Resonance ~TzN Channels Pll(1470) a N probably dominant Dla(1512 ) Sll (1540) Dis(1670 ) Fi5(1690 ) D33(1670) F37(1940) rcA ~zA aN aN ~A rcA rcA ~A ~A o possible ~40% possible possible (~ 5-10 %) very small ~45% ~25% probably dominant ~50% ~10% Not surprisingly in photon induced reactions the predominant many body final state in the resonance region is ~1cN. However, of the three reactions possible on protons, namely 7 p ~ + rc-p , re~176 ~+ ~z~ only the Tc§ ~z p final state has been studied in any detail because of the obvious difficulty of the two neutrals in the other two reactions.

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