Analysis of the resonant components inB¯0→J/ψπ+π−
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Abstract
Interpretation of CP violation measurements using charmonium decays, in both the " B 0 and " B 0 s systems, can be subject to changes due to ''penguin'' type diagrams. These effects can be investigated using measurements of the Cabibbo-suppressed " B 0 ! J=c decays. The final state composition of this channel is investigated using a 1:0 fb 1 sample of data produced in 7 TeV pp collisions at the LHC and collected by the LHCb experiment. A modified Dalitz-plot analysis is performed using both the invariant mass spectra and the decay angular distributions. An improved measurement of the " B 0 ! J=c branching fraction of 3:97 AE 0:09 AE 0:11 AE 0:16 10 5 is reported where the first uncertainty is statistical, the second is systematic, and the third is due to the uncertainty of the branching fraction of the decay B ! J=c K used as a normalization channel. Significant production of f 0 500 and 770 resonances is found in the substructure of the J=c final state, and this indicates that they are viable final states for CP violation studies. In contrast evidence for the f 0 980 resonance is not found. This allows us to establish the first upper limit on the branching fraction product B " B 0 ! J=c f 0 980 Bf 0 980 ! < 1:1 10 6 , leading to an upper limit on the absolute value of the mixing angle of the f 0 980 with the f 0 500 of less than 31 , both at 90% confidence level.
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