科研之友
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摘要
We discuss production of charm quarks, mesons as well as nonphotonic electrons in pp scattering at RHIC. The distributions in rapidity and transverse momentum of charm and bottom quarks/antiquarks are calculated in the k(t)-factorization approach. The hadronization of heavy quarks is done by means of phenomenological fragmentation functions and semileptonic decay functions are found by fitting semileptonic decay data. Good description of the inclusive data at large transverse momenta of electrons is obtained and a missing strength at small transverse momenta of electrons is found. In addition, we discuss kinematical correlations between charged leptons from different mechanisms. Reactions initiated by purely QED gamma*gamma*-fusion in elastic and inelastic pp collisions as well as diffractive mechanism of exclusive c (c) over bar production are included. A good description of the dilepton invariant mass spectrum of the PHENIX Collaboration is achieved. Distributions in the dilepton pair transverse momentum and in azimuthal angle between electron and positron are presented. A new mechanism of exclusive production of c (c) over bar is discussed. Corresponding results are shown and the possibility of its identification is discussed. We discuss also production of two pairs of c (c) over bar within a simple formalism of double-parton scattering (DPS). Very large cross sections, comparable to single-c (c) over bar production, are predicted for LHC energies. Both total inclusive cross section as a function of energy and differential distributions are shown. We discuss a perspective how to identify the double scattering contribution.
- 出版日期2012-7
