Heavy Flavor Kinematic Correlations in Cold Nuclear Matter

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It has been proposed that the azimuthal distributions of heavy flavor quark-antiquark pairs may be modified in the medium of a heavy-ion collision. This assumption was tested through next-to-leading order (NLO) calculations of the azimuthal distribution, $d\sigma/d\phi$, including transverse momentum broadening, employing $\langle k_T^2 \rangle$ and fragmentation in exclusive $Q \overline Q$ pair production [1].

The results have been compared to $p+p$ and $p + \overline p$ data on $Q \overline Q$ azimuthal correlations [1] as well as $b \overline b$ mass, pair $p_T$, rapidity, rapidity gap, $p_T$ asymmetry and azimuthal difference correlations in $p+p$ collisions through their decays to $J/\psi J/\psi$, as measured by LHCb [2]. Agreement with the data was found to be excellent.

Possible cold and hot matter effects on these correlations are investigated through the effects of nuclear modifications of the parton densities, enhanced $k_T$ broadening and energy loss.

[1] R. Vogt, Phys. Rev. C {\bf 98} (2018) 034907.

[2] R. Vogt, arXiv:1908.05320 [hep-ph], submitted to Phys. Rev. C.

This work was performed under the auspices of the U.S. Department of Energy by Lawrence Livermore National Laboratory under Contract DE-AC52-07NA27344 and supported by the U.S. Department of Energy, Office of Science, Office of Nuclear Physics (Nuclear Theory) under contract number DE-SC-0004014..

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