Studies of Beauty Suppression via Nonprompt $D^0$ Mesons in Pb-Pb Collisions at $Q^2 = 4$ $\rm GeV^2

• Published in: Physical review letters Vol. 123; no. 2
• Main Authors: Sirunyan, Albert M, Tumasyan, Armen, Adam, Wolfgang, Ambrogi, Federico, Asilar, Ece, Bergauer, Thomas, Brandstetter, Johannes, Dragicevic, Marko, Erö, Janos, Escalante del Valle, Alberto, Flechl, Martin, Fruehwirth, Rudolf, Ghete, Vasile Mihai, Hrubec, Josef, Jeitler, Manfred, Krammer, Natascha, Krätschmer, Ilse, Liko, Dietrich, Madlener, Thomas, Mikulec, Ivan, Rad, Navid, Rohringer, Herbert, Schieck, Jochen, Schöfbeck, Robert, Spanring, Markus, Spitzbart, Daniel, Taurok, Anton, Waltenberger, Wolfgang, Wittmann, Johannes, Wulz, Claudia-Elisabeth, Zarucki, Mateusz, Chekhovsky, Vladimir, Mossolov, Vladimir, Suarez Gonzalez, Juan, de Wolf, Eddi A, Di Croce, Davide, Janssen, Xavier, Lauwers, Jasper, Pieters, Maxim, van Haevermaet, Hans, van Mechelen, Pierre, van Remortel, Nick, Abu Zeid, Shimaa, Blekman, Freya, d'Hondt, Jorgen, de Bruyn, Isabelle, de Clercq, Jarne, Deroover, Kevin, Flouris, Giannis, Lontkovskyi, Denys, Lowette, Steven, Marchesini, Ivan, Moortgat, Seth, Moreels, Lieselotte, Python, Quentin, Skovpen, Kirill, Tavernier, Stefaan, van Doninck, Walter, van Mulders, Petra, van Parijs, Isis, Beghin, Diego, Bilin, Bugra, Brun, Hugues, Clerbaux, Barbara, de Lentdecker, Gilles, Delannoy, Hugo, Dorney, Brian, Fasanella, Giuseppe, Favart, Laurent, Goldouzian, Reza, Grebenyuk, Anastasia, Kalsi, Amandeep Kaur, Lenzi, Thomas, Luetic, Jelena, Postiau, Nicolas, Starling, Elizabeth, Thomas, Laurent, Vander Velde, Catherine, Vanlaer, Pascal, Vannerom, David, Wang, Qun, Cornelis, Tom, Dobur, Didar, Fagot, Alexis, Gul, Muhammad, Khvastunov, Illia, Poyraz, Deniz, Roskas, Christos, Trocino, Daniele, Tytgat, Michael, Verbeke, Willem, Vermassen, Basile, Vit, Martina, Zaganidis, Nicolas, Bakhshiansohi, Hamed, Bondu, Olivier, Brochet, Sébastien, Bruno, Giacomo, Caputo, Claudio, David, Pieter
• Format: Journal Article
• Language: English
• Published: American Physical Society 2019
• Subjects: High Energy Physics - Experiment; Nuclear Experiment; Physics; experimental results; topology; yield: measured; CMS; B: yield; CERN LHC Coll; Elementary Particles and Fields; 5020 GeV-cms; transverse momentum: momentum spectrum; lead; nuclear matter: effect; D0: momentum spectrum; B: hadronic decay; heavy ion: scattering; quark gluon: plasma; suppression; transverse momentum dependence; p p: scattering; energy loss
• ISSN: 0031-9007; 1079-7114
• DOI: 10.1103/PhysRevLett.123.022001

The transverse momentum spectra of D0 mesons from b hadron decays are measured at midrapidity (|y|<1) in pp and Pb-Pb collisions at a nucleon-nucleon center of mass energy of 5.02 TeV with the CMS detector at the LHC. The D0 mesons from b hadron decays are distinguished from prompt D0 mesons by their decay topologies. In Pb-Pb collisions, the B→D0 yield is found to be suppressed in the measured pT range from 2 to 100  GeV/c as compared to pp collisions. The suppression is weaker than that of prompt D0 mesons and charged hadrons for pT around 10  GeV/c. While theoretical calculations incorporating partonic energy loss in the quark-gluon plasma can successfully describe the measured B→D0 suppression at higher pT, the data show an indication of larger suppression than the model predictions in the range of 2<pT<5  GeV/c.