Observation of Bs -> J/\psi f'2(1525) in J/\psi K+K- final states
LHCb Collaboration: R. Aaij, C. Abellan Beteta, B. Adeva, M. Adinolfi,, C. Adrover, A. Affolder, Z. Ajaltouni, J. Albrecht, F. Alessio, M. Alexander,, G. Alkhazov, P. Alvarez Cartelle, A. A. Alves Jr, S. Amato, Y. Amhis, J., Anderson, R. B. Appleby, O. Aquines Gutierrez
TL;DR
This paper reports the first observation of the decay Bs -> J/psi f'2(1525) in J/psi K+K- final states, revealing a significant resonance at higher K+K- masses with precise branching ratio measurement.
Contribution
The study provides the first evidence of Bs decay into J/psi and the f'2(1525) resonance, expanding understanding of Bs decay channels at higher K+K- masses.
Findings
Significant signal observed in f'2(1525) region
Measured branching ratio B(Bs->J/psi f'2(1525))/B(Bs->J/psi ) = (26.4 1 2.7 1 2.4 1)%
First observation of this decay mode
Abstract
The decay Bs -> J/\psi K+ K- is investigated using 0.16/fb of data collected with the LHCb detector using 7 TeV pp collisions. Although the J/\psi \phi\ channel is well known, final states at higher K+K- masses have not previously been studied. In the K+K- mass spectrum we observe a significant signal in the f'2(1525) region as well as a non-resonant component. After subtracting the non-resonant component, we find B(Bs->J/\psi f'_2(1525))/B(Bs->J/\psi \phi)=(26.4 +/- 2.7 +/- 2.4)%.
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