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Olga Piskounova, P.N.Lebedev Physical Institute, Moscow

Leading Effects in the Spectra of L c and anti L c Produced in S - p, pp and p - p Interactions. Olga Piskounova, P.N.Lebedev Physical Institute, Moscow. Quark-Gluon String Model. O.Piskounova DIS03. Valence Quark Distributons in QGSM. O.Piskounova DIS03.

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Olga Piskounova, P.N.Lebedev Physical Institute, Moscow

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  1. LeadingEffects in the Spectra ofLcandantiLcProduced inS- p, pp andp- p Interactions. Olga Piskounova, P.N.Lebedev Physical Institute, Moscow

  2. Quark-Gluon String Model O.PiskounovaDIS03

  3. 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 Lc in p-p collisions are given by:

  4. Fragmentation diagrams

  5. Diquark Fragmentation Function and String Junction Transfer Diquark fragmentation function includes the constant afLcthat can be interpreted as “leading” paremeter: where the term z2aR(0)-2aN(0) means the probability for diquark to have z close to 0. Fragmentation function of string junction is of the similar form: where aSJ(0)=0,5. O.PiskounovaDIS03

  6. D meson asymmetry in pp O.PiskounovaDIS03 A=(N D- -N D+ /(N D- +N D+ )

  7. Lc /antiLc asymmetry in Sp O.PiskounovaDIS03

  8. Lc /antiLc asymmetry in pp O.PiskounovaDIS03

  9. Conclusions 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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