By Dr. Werner Hofmann (auth.)
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Extra resources for Jets of Hadrons
Example text
05 The subscript q refers to the nature of the parent parton, ~ is defined by Obviously, as Q2 goes to i n f i n i t y , a l l parton (and hadron) d e n s i t i e s concentrate a t x = 0. The r a t i o of the various components stays constant. Compared to the valence quark, gluons and sea quarks are suppressed by f a c t o r s ( l - x ) and ( l - x ) 2 r e s p e c t i v e l y . Thus the leading p a r t i c l e e f f e c t , which means the dominance a t high x of p a r t i c l e s containing the o r i g i n a l quark is not destroyed by the QCD c o r r e c t i o n s .
OooF . . . 04F .... 04 o .... = , ......... ,I .... 2 .... -~176 _O,04J ~ . . z . 1 .... ,~ .... o4' Y_ 1 _z. . . . . . . ,~ .... ,4 .... ~ .... 1 6 Y 1 ............. 3 .... ,4 .... ,5 .... 04 1 0 ' 1 ' 2 Yz 3 4 5 F i g . 4 . 1 1 a - c . 11. The most remarkable consequence of these considerations is that even i f a j e t starts from a nonstrange quark, i t f i n a l l y acquires a net strangeness, which has to be compensated by the opposite antiquark j e t . 16) is f i n i t e for z § O) only the high-y region of the j e t is influenced by the parents quantum numbers, and the plateau e s s e n t i a l l y stays neutral.
4~ and the kinetic energy of the quark is converted into surface and volume energy of the bag. When the bag reaches a c r i t i c a l length, i t is energetically more favorable to create a new quark-antiquark pair in between the i n i t i a l quarks. These new quarks screen the i n i t i t a l color f i e l d s and the bag breaks up into two new, spherical bags, each containing one initial and one new quark. One of these bags is a slowly moving ground state bag, while the other, which contains the fast quark, starts to become c y l i n d r i c a l , repeating the process u n t i l the whole i n i t i a l energy is converted into a series of bags moving along the direction of the i n i t i a l momentum transfer.