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HEAVY FLAVOUR PRODUCTION IN PP COLLISIONS AND
INTRINSIC QUARK COMPONENTS IN PROTON
G.I. Lykasov † , V.A.Bednyakov and A.F. Pikelner
JINR, Dubna, 141980, Moscow region
† E-mail: lykasov@jinr.ru
The study of the forward heavy flavour hadron production can be a new unique source
for estimation of intrinsic charm, bottomand strangeness contributions to the proton. We
present a short review on a search for these quark components in the proton and illustrate
a possibility to observe them in ep DIS and pp inelastic collisions at high energies. As for
example, we present some predictions for the D-meson production in pp collisions made
within the perturbative QCD including the intrinsic charm (IC) in the proton [1] that can
be verified at the LHC. By the calculations we used the parton distribution function of
typeCTEQ66cwiththeICprobabilityabout3.5thatdescribes rathersatisfactorilytheep
DIS [2]. Figure 1 shows that the IC contribution for the single D 0 -meson production can
be sizable, it is about 100 % at large pseudo-rapidities 3 ≤ η ≤ 4.5 and large transverse
momenta 10 ≤ p t ≤ 25 GeV/c. The search for the intrinsic strangeness in p-p collisions
at the energies of LHC, CBM, HADES and NICA experiments is also discussed.
dN/dη
9000
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s = 7 TeV 10 GeV < p < 25 GeV
T
CTEQ66c 3,5% IC
Entries: 781710
CTEQ66
Entries: 727285
0
2 2.5 3 3.5 4 4.5 5 5.5 6 6.5
|η|
Figure 5: The D + ¯D 0 distributions over the pseudo-rapidity η in pp → (D 0 + ¯D 0 )X at
√ s = 7 TeV and 10 ≤ pt ≤ 25 GeV/c. The solid line corresponds to the IC inclusion with
the probability about 3.5%; the dashed curve corresponds to the calculations ignoring the
IC contribution in proton.
References
[1] G.L. Lykasov, V.A. Bednyakov, A.F. Pikelner, N.I. Zimin, Eur.Phys.Lett., 99, 21002
(2012); arXiv:1205.1131v2 [hep-ph].
[2] P.M. Nadolsky et.al., Phys.Rev. D78, 013004 (2007).
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