| Popis: |
In v iew of t h e i n t e r e s t in t h e p r o d u c t i o n of h i g h e r s p i n resonances , especia l ly those w h i c h m a y be p r o d u c e d b y p o m c r o n e x c h a n g e (x-4) in sp in-0 to spin-s t r a n s i t i o n s , we e x t e n d t h e resu l t s of two p rev ious p a p e r s (5.s) to inc lude s channe l ve r t i c e s for h i g h e r spin boson p roduc t i on . Th i s al lows us to c o m m e n t on n o n s e n s e m e c h a n i s m s a n d he l i c i t y c o n s e r v a t i o n as app l i ed to these ver t ices . P a r t of t h e i n t e r e s t in d i f f rac t ive d i s soc ia t ion s t e m s f rom t h e n u m b e r of ru les proposed to g o v e r n t h e s e p rocesses ; espec ia l ly as t h e s e ru les , b a s e d e i t h e r on specific models (3.7-~) or p b e n o m e n o l o g i c a l o b s e r v a t i o n (10), do n o t a lways agree. M o r r i s o n ' s ru le (10), for example , fo rb ids t h e c h a n g e of n o r m a l i t y ( N : ( ) ~ P ) a t a v e r t e x a n d t h e ava i l ab le f e rmion r e s o n a n c e p r o d u c t i o n is in a g r e e m e n t w i t h i t (~). I t o w e v e r , a t boson ve r t i ces t he d a t a a d m i t va r ious i n t e r p r e t a t i o n s . Morr i sons ' ru le a n d t h e tw i s t ed loop q u a r k mode l of :FRF, UND-JONEs-:RIvERS ( F J R (a)) a l low t h e 0--1 + (,~-A~, K-Q) t r a n s i t i o n w h i c h is n o t a l lowed b y t h e m o d e l of CARUTz-FRA~TSCH1-ZwEIG (CFZ (7)) in w h i c h c h a n g e of q u a r k spin a t a v e r t e x is fo rb idden . On t h e o t h e r h a n d , t h e 0--2 + (~-A 2, K-K**) t r a n s i t i o n is f o r b i d d e n b y Mor r i son ' s ru le a n d CFZ b u t n o t b y F J R . T h e m o d e l of C n o v a n d YA~'G (8) a l lows a n y d i f f rac t ive p rocess A B ~ C D b u t r e q u i r e s da /d t ~ 0 a t t = 0 if t h e p r o d u c t of t h e pa r i t i e s of A, B, C a n d D is nega t ive . S u p e r i m p o s e d u p o n t h e a r g u m e n t a b o u t ru les of p o m e r o n coup l ing is t h e ques t i on of w h e t h e r t h e p o m e r o n conse rves s c h a n n e l he l i e i t y w h e n i t does couple. T h e r e is |
Full text from SpringerLink