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Adam, J.; Aphecetche, Laurent; Audurier, B.; Baldisseri, A.; Batigne, Guillaume; Belikov, I.; Borel, H.; Castellanos, J. Castillo; Charvet, J.L.; Cheshkov, C.; Hamon, J..C; Cheynis, B.; Ducroux, L.; Erazmus, B.; Estienne, Magali; Feuillard, V.J.G.; Francisco, A.; Germain, Marie; Hippolyte, B.; Kuhn, C.; Lardeux, A.; Maire, A.; Martinez Garcia, Gines; Molnar, L.; Morreale, A.; Costa, H. Pereira Da; Pillot, Philippe; Rami, F.; Rakotozafindrabe, A.; Ronflette, L.; Roy, C.; Schutz, Y.; Shabetai, Alexandre; Stocco, Diego; Teyssier, B.; Tieulent, R.; Vernet, R.; Zhu, J.; Conesa Balbastre, G.; Faivre, J.; Furget, C.; Guernane, R.; Silvestre, C.; Vauthier, A.; Yokoyama, H.; Valle, Z. Conesa Del; Das, I.; Espagnon, B.; Hadjidakis, C.; Lakomov, I.; Suire, C.; Takaki, J. D. Tapia; Tarhini, M.; Palomo, L. Valencia; Barret, V.; Bastid, N.; Camejo, A. Batista; Crochet, P.; Dupieux, P.; Lopez, X.; Manso, F.; Porteboeuf-Houssais, S.; Rosnet, P.; Vulpescu, B.
The journal of high energy physics, 2017, Letnik: 7, Številka: 7Journal Article
The production of beauty hadrons was measured via semi-leptonic decays at mid-rapidity with the ALICE detector at the LHC in the transverse momentum interval $1<p_{\rm T}<8$ GeV/$c$ in minimum-bias p-Pb collisions at $\sqrt{s_{\rm NN}}=5.02$ TeV and in $1.3<p_{\rm T}<8$ GeV/$c$ in the 20% most central Pb-Pb collisions at $\sqrt{s_{\rm NN}}=2.76$ TeV. The pp reference spectra at $\sqrt{s}=5.02$ TeV and $\sqrt{s}=2.76$ TeV, needed for the calculation of the nuclear modification factors $R_{\rm pPb}$ and $R_{\rm PbPb}$, were obtained by a pQCD-driven scaling of the cross section of electrons from beauty-hadron decays measured at $\sqrt{s}=7$ TeV. The $R_{\rm PbPb}$ is about 0.7 with an uncertainty of about 30% in the interval $3<p_{\rm T}<6$ GeV/$c$ and 0.47 with an uncertainty of 25% in $6<p_{\rm T}<8$ GeV/$c$ in Pb-Pb collisions. Below $p_{\rm T}=3$ GeV/$c$, the $R_{\rm PbPb}$ values increase with decreasing transverse momentum with systematic uncertainties of 30-45%. The $R_{\rm pPb}$ is consistent with unity within systematic uncertainties of about 20% at high $p_{\rm T}$, increasing at low $p_{\rm T}$, and is well described by theoretical calculations that include cold nuclear matter effects in p-Pb collisions. The measured $R_{\rm pPb}$ and these calculations indicate that cold nuclear matter effects are small at high transverse momentum also in Pb-Pb collisions. Therefore, the observed reduction of $R_{\rm PbPb}$ below unity for high $p_{\rm T}$ can be ascribed to an effect of the hot and dense medium formed in Pb-Pb collisions.
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