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Acharya, B. S.; Alexeev, G. D.; Augsten, K.; Avila, C.; Bellantoni, L.; Beri, S. B.; Bernhard, R.; Bertram, I.; Bloom, K.; Boline, D.; Boos, E. E.; Borissov, G.; Brandt, A.; Brock, R.; Bross, A.; Buescher, V.; Buszello, C. P.; Camacho-Pérez, E.; Chakrabarti, S.; Chen, G.; Choi, S.; Cousinou, M.-C.; Davies, G.; Demina, R.; DeVaughan, K.; Diehl, H. T.; Evans, H.; Evdokimov, V. N.; Filthaut, F.; Fox, H.; Fuess, S.; Geng, W.; Grannis, P. D.; Gris, Ph; Grohsjean, A.; Grünendahl, S.; Hays, J.; Hedin, D.; Herner, K.; Hirosky, R.; Hubacek, Z.; Ilchenko, Y.; Jabeen, S.; Jeong, M. S.; Jiang, P.; Johnson, E.; Johnson, M.; Kozelov, A. V.; Kurča, T.; Lei, X.; Li, D.; Lim, J. K.; Linnemann, J.; Lipton, R.; Lopes de Sa, R.; Luna-Garcia, R.; Madar, R.; Martínez-Ortega, J.; Meijer, M. M.; Menezes, D.; Mondal, N. K.; Nayyar, R.; Nunnemann, T.; Orduna, J.; Parihar, V.; Park, S. K.; Penning, B.; Pétroff, P.; Popov, A. V.; Price, D.; Prokopenko, N.; Qian, J.; Quadt, A.; Ratoff, P. N.; Ripp-Baudot, I.; Ross, A.; Sajot, G.; Savage, G.; Scanlon, T.; Scheglov, Y.; Schwanenberger, C.; Shary, V.; Shaw, S.; Snow, G. R.; Söldner-Rembold, S.; Tully, C.; Uvarov, L.; Uvarov, S.; van Leeuwen, W. M.; Varelas, N.; Verkheev, A. Y.; Wahl, H. D.; Warchol, J.; Watts, G.; Wyatt, T. R.; Xie, Y.; Yatsunenko, Y. A.; Ye, W.; Ye, Z.; Zennamo, J.
Physical review. D, Particles, fields, gravitation, and cosmology, 1/2014, Letnik: 89, Številka: 1Journal Article
We investigate the decay B^+ -> J/psi phi K^+ in a search for the X(4140) state, a narrow threshold resonance in the J/psi phi system. The data sample corresponds to an integrated luminosity of 10.4 fb^{-1} of ppbar collisions at sqrt s =1.96 TeV collected by the D0 experiment at the Fermilab Tevatron collider. We observe a mass peak with a statistical significance of 3.1 standard deviations and measure its invariant mass to be M=4159.0 +-.3 (stat) +- 6.6 (syst) MeV and its width to be Gamma= 19.9+-12.6 (stat)}^{+1.0}_{-8.0} (syst) MeV. Identifying this mass peak as the X(4140), we measure, for M(J/psi phi) <4.59 GeV, the relative branching fraction B_rel= B(B^+ -> X(4140) K^+)/ B(B^+ ->J/psi phi K^+) to be 21+-8 (stat) +- 4 (syst)%. In addition, the data can accommodate the presence of a second enhancement at a mass of 4328.5+- 12.0 MeV.
