Measurement of beauty production via non-prompt D0 mesons in Pb-Pb collisions at $$ \sqrt{{\textrm{s}}_{\textrm{NN}}} $$ = 5.02 TeV

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<jats:title>A<jats:sc>bstract</jats:sc> </jats:title><jats:p>The production of non-prompt D<jats:sup>0</jats:sup> mesons from beauty-hadron decays was measured at midrapidity (|<jats:italic>y</jats:italic>| <jats:italic><</jats:italic> 0<jats:italic>.</jats:italic>5) in Pb-Pb collisions at a nucleon-nucleon center-of-mass energy of <jats:inline-formula><jats:alternatives><jats:tex-math>$$ \sqrt{{\textrm{s}}_{\textrm{NN}}} $$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msqrt> <mml:msub> <mml:mi>s</mml:mi> <mml:mi>NN</mml:mi> </mml:msub> </mml:msqrt> </mml:math></jats:alternatives></jats:inline-formula> = 5<jats:italic>.</jats:italic>02 TeV with the ALICE experiment at the LHC. Their nuclear modification factor (<jats:italic>R</jats:italic><jats:sub>AA</jats:sub>), measured for the first time down to <jats:italic>p</jats:italic><jats:sub>T</jats:sub> = 1 GeV<jats:italic>/c</jats:italic> in the 0–10% and 30–50% centrality classes, indicates a significant suppression, up to a factor of about three, for <jats:italic>p</jats:italic><jats:sub>T</jats:sub><jats:italic>></jats:italic> 5 GeV<jats:italic>/c</jats:italic> in the 0–10% central Pb-Pb collisions. The data are described by models that include both collisional and radiative processes in the calculation of beauty-quark energy loss in the quark-gluon plasma, and quark recombination in addition to fragmentation as a hadronisation mechanism. The ratio of the non-prompt to prompt D<jats:sup>0</jats:sup>-meson <jats:italic>R</jats:italic><jats:sub>AA</jats:sub> is larger than unity for <jats:italic>p</jats:italic><jats:sub>T</jats:sub><jats:italic>></jats:italic> 4 GeV<jats:italic>/c</jats:italic> in the 0–10% central Pb-Pb collisions, as predicted by models in which beauty quarks lose less energy than charm quarks in the quark-gluon plasma because of their larger mass.</jats:p>

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