The production of non-prompt D-0 mesons from beauty-hadron decays was measured at midrapidity (vertical bar y vertical bar < 0.5) in Pb-Pb collisions at a nucleon-nucleon center-of-mass energy of root s(NN) = 5.02TeV with the ALICE experiment at the LHC. Their nuclear modification factor (R-AA), measured for the first time down to p(T) = 1 GeV/ c in the 0-10% and 30-50% centrality classes, indicates a significant suppression, up to a factor of about three, for p(T) > 5 GeV/ c 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-0-meson R-AA is larger than unity for p(T) > 4 GeV/c 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.

Measurement of beauty production via non-prompt D-0 mesons in Pb-Pb collisions at root s(NN)=5.02 TeV

Alessandro, B.;Alici, A.;Aziz, S.;Banerjee, D.;Baruffaldi, F.;Basu, S.;Bearden, I. G.;Bellini, F.;Biswas, S.;Bruno, G. E.;Colella, D.;Contin, G.;Das, P.;Dash, S.;De Caro, A.;De Falco, A.;Deb, S.;Evans, D.;Faggin, M.;Faivre, J.;Giacalone, M.;Giubilato, P.;Grelli, A.;Harris, J. W.;Janik, M. A.;Jung, J.;Kim, J. S.;Kundu, S.;Lunardon, M.
Membro del Collaboration Group
;
Margotti, A.;Martinez M.;Micheletti, L.;Negru, A.;Pagano, D.;Petrov, V;Rehman, A.;Richter, M.;Riggi, F.;Roy, A.;Rui, R.;Sharma, A.;Sinha, T.;Soramel, F.;Stocco, D.;Swain, S.;Szarka, I;Terrevoli, C.;Thomas, D.;Trogolo, S.;Turrisi, R.;Uras, A.;Vercellin, E.;Wagner, B.;Wang, C.;Wright, J. R.;Wu, W.;Zhou, Y.;Zhu, J.;
2022

Abstract

The production of non-prompt D-0 mesons from beauty-hadron decays was measured at midrapidity (vertical bar y vertical bar < 0.5) in Pb-Pb collisions at a nucleon-nucleon center-of-mass energy of root s(NN) = 5.02TeV with the ALICE experiment at the LHC. Their nuclear modification factor (R-AA), measured for the first time down to p(T) = 1 GeV/ c in the 0-10% and 30-50% centrality classes, indicates a significant suppression, up to a factor of about three, for p(T) > 5 GeV/ c 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-0-meson R-AA is larger than unity for p(T) > 4 GeV/c 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.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11577/3468232
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