Double parton scattering in $p\bar p$ interactions at $\sqrt{s} = 1.96$ TeV

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$Double parton scattering in $p\bar p$ interactions at $\sqrt{s} = 1.96$ TeV$

Double parton scattering in $p\bar p$ interactions at $\sqrt{s} = 1.96$ TeV

Gogota, O.

Il Nuovo Cimento. C, 12/2016, Volume: C39, Issue: 4

Journal Article

We present the observation of doubly produced $J / \psi$ mesons as an example of processes containing a substantial fraction of double parton scattering. Measurements of the production cross sections for singly and doubly-produced $J/\psi$ mesons were done with the D0 detector at Fermilab in $p\bar{p}$ collisions at $\sqrt{s}$ = 1.96 TeV with an integrated luminosity of 8.1 fb$^{-1}$. For the first time, the double $J / \psi$ production cross section is separated into two parts: contributions from both single and double parton scattering. Lastly, this separation allowed us to determine the effective cross section σeff, a parameter related to the parton spatial density inside the hadron.

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