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  • Measurement of the relative...
    Aguilo, E.; Rohringer, H.; Wulz, C.-E.; Roland, B.; Vander Marcken, G.; Beernaert, K.; Verwilligen, P.; Padula, Sandra S.; Tcholakov, V.; Liang, D.; Liang, S.; Teng, H.; Polic, D.; Rebane, L.; Kinnunen, R.; Lassila-Perini, K.; Goerlach, U.; Wittmer, B.; Zhukov, V.; Papacz, P.; Reithler, H.; Nowack, A.; Diez Pardos, C.; Katsas, P.; Kuznetsova, E.; Mussgiller, A.; Schoerner-Sadenius, T.; Schleper, P.; Mueller, S.; Szillasi, Z.; Raics, P.; Kumar, V.; Colaleo, A.; D’Alessandro, R.; Gonzi, S.; Sguazzoni, G.; Pozzobon, N.; Riccardi, C.; Taroni, S.; Martini, L.; Nourbakhsh, S.; Sigamani, M.; Mariotti, C.; Montanino, D.; Son, D. C.; Hong, B.; Goh, J.; Carrillo Moreno, S.; Bell, A. J.; Asghar, M. I.; Pashenkov, A.; Tlisov, D.; Semenov, S.; Djordjevic, M.; Auzinger, G.; Mäki, T.; Mersi, S.; Musella, P.; Casal, B.; Sanchez, A. K.; Theofilatos, K.; Urscheler, C.; Favaro, C.; Chen, K. H.; Karaman, T.; Polatoz, A.; Belyaev, A.; Harper, S.; Cripps, N.; Fantasia, C.; Lawson, P.; Rohlf, J.; Laird, E.; Pellett, D.; Rakness, G.; Bellan, R.; Richman, J.; Calamba, A.; Stenson, K.; Ulmer, K. A.; Kwan, S.; De Gruttola, M.; Kim, B.; Kropivnitskaya, A.; Zakaria, M.; Gerber, C. E.; Griffiths, S.; Li, W.; Franzoni, G.; Tambe, N.; Claes, D. R.; Wayne, M.; Geurts, F. J. M.; Roberts, J.; Duggan, D.; Halkiadakis, E.; Robles, J.; Toback, D.; Lee, S. W.; Appelt, E.

    The European physical journal. C, Particles and fields, 01/2012, Letnik: 72, Številka: 12
    Journal Article

    A measurement is presented of the relative prompt production rate of χ c2 and χ c1 with 4.6 fb −1 of data collected by the CMS experiment at the LHC in pp collisions at \documentclass12pt{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$\sqrt{s}= 7~\mathrm{TeV}$\end{document} . The two states are measured via their radiative decays χ c →J/ ψ + γ , with the photon converting into an e + e − pair for J/ ψ rapidity | y (J/ ψ )|<1.0 and photon transverse momentum p T ( γ )>0.5 GeV/ c . The measurement is given for six intervals of p T (J/ ψ ) between 7 and 25 GeV/ c . The results are compared to theoretical predictions.