22–26 Apr 2013
Marseille, Parc Chanot
Europe/Monaco timezone

Production of two $c \bar c$ pairs in double-parton scattering within $k_{t}$-factorization approach

24 Apr 2013, 15:00
20m
Morgiou (Palais des Congrès)

Morgiou

Palais des Congrès

Talk in Parallel Session at DIS2013 Heavy Flavours WG4/5: Heavy Flavours, QCD and Hadronic Final States

Speakers

Antoni Szczurek (Institute of Nuclear Physics) Rafal Maciula (Institute of Nuclear Physics PAN)

Description

We discuss production of two pairs of $c \bar c$ in proton-proton collisions at the LHC. Both double-parton scattering (DPS) and single-parton scattering (SPS) contributions are included in the analysis. Each step of DPS is calculated within $k_t$-factorization approach, i.e. effectively including next-to-leading order corrections. The conditions how to identify the DPS contribution are presented. The discussed mechanism unavoidably leads to the production of pairs of mesons: $D_i D_j$ (each containing $c$ quarks) or $\bar D_i \bar D_j$ (each containing $\bar c$ antiquarks). We calculate corresponding production rates for different combinations of charmed mesons as well as some differential distribution for $(D^0 D^0$ + $\bar D^0 \bar D^0)$ production. Within large theoretical uncertainties the predicted DPS cross section is fairly similar to the cross section measured recently by the LHCb collaboration. The best description is obtained with the Kimber-Martin-Ryskin (KMR) unintegrated gluon distribution, which very well simulates higher-order corrections. The contribution of SPS, calculated in the high-energy approximation, turned out to be rather small. Finally, we emphasize significant contribution of DPS mechanism to inclusive charmed meson spectra measured recently by ALICE, ATLAS and LHCb.

Author

Rafal Maciula (Institute of Nuclear Physics PAN)

Co-author

Antoni Szczurek (Institute of Nuclear Physics)

Presentation materials