Download Jets of Hadrons by Dr. Werner Hofmann (auth.) PDF

By Dr. Werner Hofmann (auth.)

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5. Mass distributions for colorsinglet objects in q~ jets at d i f f e r e n t energies. 37) Notice that grows faster with Q than any power of logarithms. C The importance of these results is obvious. Under the reasonable assumption that 2 confinement at QO converts these clusters into hadrons without a large reshuffling of color l i n e s , the f i n a l state of the parton evolution is no longer a system of v i r t u a l colored objects which are hard to deal with. Instead, one has a number of physical objects, which can be treated as on-shell massive states and whose properties are independent of the i n i t i a l Q.

This is the object of a suggestion by FEYNMAN/ 4 / . He conjectured that the t o t a l quantum numbers of a l l the fragments in t h i s region averaged over events should be equal to the ( f r a c t i o n a l ) quantum numbers of the parent quark. A necessary, but not s u f f i c i e n t condition f o r retention of quantum numbers is that the rank I mesons stay at large r a p i d i t i e s in the j e t . This is e a s i l y demonstrated. Assume we cut the j e t somewhere, e . g . 01 and sum up the quantum numbers of a l l p a r t i c l e s with higher z.

Again the agreement is good. 0 l~, 1 do j~ ~t | /l ~, 3~- i' 1' vN,vp--+ u+ X ~ a}vN | .... 9a,b. Distribution in z for the fastest and the second fastest charged hadrons, compared with FF and LPS in (a) ~N and (b) ON i n t e r actions /94/ 0 I~ --0'12-+0"13 1 ;; ............ 0 -0,2 -T ......... 10. Distribution of the charge dQ/d In(z) plotted vs In(z) for u- and dquark fragmentation /95/. The curve is from Feynman and Field 43 vation. The m u l t i p l i c i t y has been constrained to the observed one.

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