Evidence in favor of single parton scattering mechanism in ϒ and D associated production at the LHC
| Autor: | Anton Karpishkov, Vladimir Saleev, Maxim Nefedov |
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| Rok vydání: | 2019 |
| Předmět: | |
| Zdroj: | Physical Review D. 99 |
| ISSN: | 2470-0029 2470-0010 |
| DOI: | 10.1103/physrevd.99.096021 |
| Popis: | Associated production of prompt $\mathrm{\ensuremath{\Upsilon}}(1S)$ and ${D}^{+,0}$ mesons has been proposed as a golden channel for the search of double parton scattering, because single parton scattering contribution to the cross section is believed to be negligible on the basis of leading-order calculations in the collinear parton model. We study this process in the leading-order approximation of the parton Reggeization approach. Hadronization of a $b\overline{b}$ pair into bottomonium states is described within the framework of the nonrelativistic QCD-factorization approach, while production of $D$ mesons is described in the fragmentation model with scale-dependent fragmentation functions. We have found good agreement with LHCb data for various normalized differential distributions, except for the case of spectra on azimuthal angle differences at the small $\mathrm{\ensuremath{\Delta}}\ensuremath{\varphi}$ values. Crucially, the total cross section in our single parton scattering model accounts for more than one-half of observed cross sections, thus dramatically shrinking the room for the double parton scattering mechanism. |
| Databáze: | OpenAIRE |
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