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  • Measurement of the relative...
    Suarez Gonzalez, J.; Maes, M.; Mohammadi, A.; Reis, T.; Zaganidis, N.; Matos Figueiredo, D.; Dias, F. A.; Pavlov, B.; Duric, S.; Titov, M.; Zabi, A.; Collard, C.; Beaupere, N.; Mirabito, L.; Ostapchuk, A.; Raupach, F.; Sprenger, D.; Magass, C.; Bontenackels, M.; Sauerland, P.; Jung, H.; Erfle, J.; Ulrich, R.; Wagner-Kuhr, J.; Fiore, L.; Iaselli, G.; Dallavalle, G. M.; Fanfani, A.; Fiorendi, S.; Saha, A.; Dell’Orso, R.; Rizzi, A.; Biino, C.; Della Ricca, G.; Kim, J. H.; Lee, S.; Casimiro Linares, E.; Khan, W. A.; Shoaib, M.; Boimska, B.; Volodko, A.; Andreev, Yu; Semenov, S.; Chamizo Llatas, M.; Felcini, M.; Barney, D.; Giunta, M.; Glege, F.; Meijers, F.; Perez, E.; Santanastasio, F.; Sekmen, S.; Langenegger, U.; Donegà, M.; Grab, C.; Thea, A.; Snoek, H.; Majumder, D.; Onengut, G.; Bilin, B.; Yildirim, E.; Nirunpong, K.; Guneratne Bryer, A.; Magnan, A.-M.; Seez, C.; Sharp, P.; Bose, T.; Plager, C.; Dinardo, M. E.; Evans, D.; Sharma, V.; Rossin, R.; Chen, Y.; Liu, Y. F.; Paulini, M.; Abdullin, S.; Green, D.; Rinkevicius, A.; Yelton, J.; Askew, A.; Kalakhety, H.; Adams, M. R.; Wetzel, J.; Sanders, S.; Svintradze, I.; Li, W.; Turkewitz, J.; Kroeger, R.; Durkin, L. S.; Gerbaudo, D.; Jindal, P.; Mooney, M.; Garcia-Bellido, A.; Rose, K.; Osipenkov, I.; Perloff, A.; Roe, J.; Lee, S. W.; Volobouev, I.; Klabbers, P.

    The European physical journal. C, Particles and fields, 2012/12, 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 . 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.