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Acharya, B. S.; Augsten, K.; Aushev, Y.; Bandurin, D. V.; Bassler, U.; Bean, A.; Beuselinck, R.; Blessing, S.; Brochmann, M.; Bu, X. B.; Chandra, A.; Cihangir, S.; Claes, D.; De La Cruz-Burelo, E.; Demina, R.; DeVaughan, K.; Diehl, H. T.; Drutskoy, A.; Duperrin, A.; Elvira, V. D.; Feng, L.; Fisher, W.; Fortner, M.; García-González, J. A.; Gerber, C. E.; Golovanov, G.; Greder, S.; Greenlee, H.; Grenier, G.; Grivaz, J.-F.; Grohsjean, A.; Gutierrez, P.; Hebbeker, T.; Hegab, H.; Heredia-De La Cruz, I.; Herner, K.; Hesketh, G.; Hildreth, M. D.; Hohlfeld, M.; Hynek, V.; Ilchenko, Y.; Jayasinghe, A.; Jonckheere, A.; Jonsson, P.; Jung, A. W.; Juste, A.; Kajfasz, E.; Karmanov, D.; Kehoe, R.; Khalatyan, N.; Kozelov, A. V.; Lee, S. W.; Lellouch, J.; Li, D.; Lim, J. K.; Linnemann, J.; Lopes de Sa, R.; Luna-Garcia, R.; Meijer, M. M.; Merkin, M.; Meyer, J.; Miconi, F.; Mondal, N. K.; Nayyar, R.; Negret, J. P.; Nunnemann, T.; Parua, N.; Peters, Y.; Podstavkov, V. M.; Quinn, B.; Rominsky, M.; Ross, A.; Royon, C.; Santos, A. S.; Savitskyi, M.; Scanlon, T.; Scheglov, Y.; Shchukin, A. A.; Snow, G. R.; Söldner-Rembold, S.; Soustruznik, K.; Strauss, M.; Tsai, Y.-T.; Tsybychev, D.; Tully, C.; Uvarov, S.; van Leeuwen, W. M.; Varnes, E. W.; Vertogradov, L. S.; Vesterinen, M.; Vokac, P.; Watts, G.; Wayne, M.; Wilson, G. W.; Wobisch, M.; Yamada, R.; Yatsunenko, Y. A.; Ye, Z.; Zennamo, J.; Zieminska, D.
Physical review. D, 07/2019, Letnik: 100, Številka: 1Journal Article
We study the production of the exotic charged charmonium-like state $Z_c^{\pm}(3900)$ in $p \bar p$ collisions through the sequential process $\psi(4260) \rightarrow Z_c^{\pm}(3900) \pi^{\mp}$, $Z_c^{\pm}(3900) \rightarrow J/\psi \pi^{\pm}$. Using the subsample of candidates originating from semi-inclusive weak decays of $b$-flavored hadrons, we measure the invariant mass and natural width to be $M=3902.6^{+5.2}_{-5.0}{\rm \thinspace (stat)}^{+3.3}_{-1.4}{\rm \thinspace (syst)}$ MeV and $\Gamma=32 ^{+28}_{-21}{\rm \thinspace (stat)} ^{+26}_{-7}{\rm \thinspace (syst)}$ MeV, respectively. We search for prompt production of the $Z_c^{\pm}(3900)$ through the same sequential process. No significant signal is observed, and we set an upper limit of 0.66 at the 95\% credibility level on the ratio of prompt production to the production via $b$-hadron decays. The study is based on $10.4~\rm{fb^{-1}}$ of $p \overline p $ collision data collected by the D0 experiment at the Fermilab Tevatron collider.
