First observation of Bs -> J/psi f0(980) decays
The LHCb Collaboration: R. Aaij, B. Adeva, M. Adinolfi, C. Adrover, A., Affolder, Z. Ajaltouni, J. Albrecht, F. Alessio, M. Alexander, P. Alvarez, Cartelle, A.A. Alves Jr, S. Amato, Y. Amhis, J. Amoraal, J. Anderson, R.B., Appleby, O. Aquines Gutierrez, L. Arrabito, M. Artuso
TL;DR
This paper reports the first observation of the decay Bs -> J/psi f0(980) using LHCb data, which can be used to study CP violation in the B_s system.
Contribution
The first experimental observation of the Bs -> J/psi f0(980) decay mode and measurement of its relative branching ratio.
Findings
Observation of Bs -> J/psi f0(980) decay
Measured ratio R_{f0/phi} = 0.252 with uncertainties
Potential use in CP violation studies
Abstract
Using data collected with the LHCb detector in proton-proton collisions at a centre-of-mass energy of 7 TeV, the hadronic decay Bs -> J/psi f0(980) is observed. This CP eigenstate mode could be used to measure mixing-induced CP violation in the B_s system. Using a fit to the pi+ pi- mass spectrum with interfering resonances gives R_{f0/phi} = [Gamma(Bs -> J/psi f0, f0 -> pi+ pi-)]/[Gamma(Bs -> J/psi phi, phi -> K+K-)] = 0.252^{+0.046+0.027}_{-0.032-0.033}, where the uncertainties are statistical and systematic, respectively.
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