Evidence is reported for a narrow structure near the J/psi phi threshold in exclusive B+ -> J/psi phi K+ decays produced in (p) over bar p collisions at root s = 1.96 TeV. A signal of 14 +/- 5 events, with statistical significance in excess of 3.8 standard deviations, is observed in a data sample corresponding to an integrated luminosity of 2.7 fb(-1), collected by the CDF II detector. The mass and natural width of the structure are measured to be (4143.0 +/- 2.9(stat) +/- 1.2(syst)) MeV/c(2) and (11.7(-5.0)(+8.3)(stat) +/- 3.7(stat)) Mev/c(2).

Evidence for a Narrow Near-Threshold Structure in the J/psi phi Mass Spectrum in B+ -> J/psi phi K+ Decays

CIOCCI, MARIA AGNESE;DONATI, SIMONE;G. Punzi;
2009-01-01

Abstract

Evidence is reported for a narrow structure near the J/psi phi threshold in exclusive B+ -> J/psi phi K+ decays produced in (p) over bar p collisions at root s = 1.96 TeV. A signal of 14 +/- 5 events, with statistical significance in excess of 3.8 standard deviations, is observed in a data sample corresponding to an integrated luminosity of 2.7 fb(-1), collected by the CDF II detector. The mass and natural width of the structure are measured to be (4143.0 +/- 2.9(stat) +/- 1.2(syst)) MeV/c(2) and (11.7(-5.0)(+8.3)(stat) +/- 3.7(stat)) Mev/c(2).
2009
Aaltonen, T.; Adelman, J.; Akimoto, T.; Gonzalez, B. A.; Amerio, S.; Amidei, D.; Anastassov, A.; Annovi, A.; Antos, J.; Apollinari, G.; Apresyan, A.; ...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11568/828598
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