LeadingLeading Effects in the Effects in the Spectra Spectra
ofof cc andand antianticc
Produced inProduced in - - p, pp p, pp andand - -
p p InteractionsInteractions..
Olga Piskounova,P.N.Lebedev Physical Institute,
Moscow
Quark-Gluon String ModelQuark-Gluon String Model
O.PiskounovaDIS03
Valence Quark Distributons in QGSM
O.PiskounovaDIS03
Inclusive production cross section of hadrons H is written as a sum over n-Pomeron cylinder diagrams:
Distribution functions of c in -p collisions are given by:
Fragmentation diagramsFragmentation diagrams
Diquark Fragmentation Diquark Fragmentation Function and String Junction Function and String Junction TransferTransfer
Diquark fragmentation function includes the constant af
c that can be interpreted as
“leading” paremeter:
where the term z2R(0)-2N(0) means the
probability for diquark to have z close to 0.Fragmentation function of string junction is of
the similar form:
whereSJ(0)=0,5. O.PiskounovaDIS03
D meson asymmetry in D meson asymmetry in pp
O.PiskounovaDIS03
A=(N D- -N D+ /(N D- +N D+ )
c c /anti/anticc asymmetry in asymmetry in pp
O.PiskounovaDIS03
c c /anti/anticc asymmetry in asymmetry in pp
O.PiskounovaDIS03
ConclusionsConclusions
The nonzero baryon/antibaryon asymmetry in pion reaction is sensitive to the features of baryon charge transfer by the proton string junction
The charmed baryon/antibaryon spectra were
discribed with the same leading fragmentation parameter af=0.006
There is no need to involve “intrinsic charm” in
the calculation of charmed baryon spectra at the up-to-date level of experimental data
O.PiskounovaDIS03
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