Abstract
We extend our previous studies of double-parton scattering (DPS) to simultaneous production of $c \bar c$ and $b \bar b$ and production of two pairs of $b \bar b$. The calculation is performed within factorized ansatz. Each parton scattering is calculated within $k_T$-factorization approach. The hadronization is done with the help of fragmentation functions. Production of $D$ mesons in our framework was tested in our previous works. Here we present our predictions for $B$ mesons. A good agreement is achieved with the LHCb data. We present our results for $c \bar c b \bar b$ and $b \bar b b \bar b$ final states. For completeness we compare results for double- and single-parton scattering (SPS). As for $c \bar c c \bar c$ final state also here the DPS dominates over the SPS, especially for small transverse momenta. We present several distributions and integrated cross sections with realistic cuts for simultaneous production of $D^0 B^+$ and $B^+ B^+$, suggesting future experimental studies at the LHC.
Highlights
Phenomena of multiple-parton interaction (MPI) have become very important for precise description of highenergy proton-proton collisions in the ongoing LHC era
As we have shown in our subsequent studies, the LHCb double charm data cannot be explained without the double-parton scattering (DPS) mechanism [5]
We discussed in detail the production of ccccand ccþ 2 jets final states in order to test and explore double-parton scattering effects
Summary
Phenomena of multiple-parton interaction (MPI) have become very important for precise description of highenergy proton-proton collisions in the ongoing LHC era. We proposed and discussed double open charm meson production pp → DDX as potentially one of the best reactions to study hard double-parton scattering effects at the LHC [3]. This conclusion was further confirmed by the LHCb Collaboration that has reported surprisingly large cross sections for DD meson-meson pair production in pp-scattering at 7 TeV [4]. As we have shown in our subsequent studies, the LHCb double charm data cannot be explained without the DPS mechanism [5] In this case, the standard SPS contribution is much smaller. We will show theoretical predictions of integrated and differential cross sections for different energies that could help to conclude whether and how the DPS effects for these two cases can be observed experimentally by the LHCb/CMS collaborations
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