The effect of final-state interactions on the asymmetry parameter in cascade decay processes

Mar, 1965
3 pages
Published in:
  • Nuovo Cim. 36 (1965) 2, 669-671
  • Published: Mar, 1965

Citations per year

19691982199520082021012345
  • 1%+(w) = q]~::~(w), q~(W)]~:(w) f~(w) ~" = +]~(W) y* The expressions for]~(W) un4]~_(W)are as follows (4): G~A=~ tW+ Mz--
    • 3x~(W--2MA--M*) (2MA--M*--W)] q* (E(w -~fV-~I L ~
      • T~-~ ~ ~-(~---~--~J + [(w+ :~a)2--~ ~] [(M* + M.)~--s ~ + ~ ~ j ) ' W~+ M *~- 2M~-- 2Z~ gu : 1 2q,2, W2+ M*~--2M~-- 2#2 2q2 where M'is the mass of Y* and q* is the resonance momentum. 2 ' For GZA~, we use the value ll.O as 0.4 given by SUs with]=0.25; and for P we take the experimental value 0.365 ~. For 0 the D-function we use a once-subtracted dispersion relation with the subtraction point at 5.7 ~, corresponding to the ~-0.~ location of the dynamical branch cut in the cross channel. In this form, the D- -o.s function fails to converge for the Y* exchange, which requires a cut-off parameter ~, whose value is adjusted so as -~2 to reproduce in the P89 amplitude, the location of ~he E-bound state in the B