Measurement of the CP-violating phase β in B[superscript 0] → [J over ψ π[superscript +] π[superscript -]] decays and limits on penguin effects
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Aaij-2015-Measurement of the C.pdf
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Author(s)
Counts, Ian Thomas Hunt
Ilten, Philip J
Williams, Michael
Date Issued
January 2015
Journal
Physics Letters B
Publisher
Elsevier
Citation
“Measurement of the CP-Violating Phase β in B[superscript 0] → [J over ψ
π[superscript +] π[superscript -]] Decays and Limits on Penguin Effects.” Physics Letters B 742 (March 2015): 38–49.
Version
Final published version
Abstract
Time-dependent CP violation is measured in the [(-) over B][superscript 0] → [J over ψ]π[superscript +]π[superscript −] channel for each π[superscript +]π[superscript −] resonant final state using data collected with an integrated luminosity of 3.0 fb[superscript −1] in pp collisions using the LHCb detector. The final state with the largest rate, [J over ψρ][superscript 0](770), is used to measure the CP -violating angle 2β[superscript eff] to be (41.7±9.6[superscript +2.8][subscript -6.3])°. This result can be used to limit the size of penguin amplitude contributions to CP violation measurements in, for example, [(-) over B][superscript 0] [subscript s] → [J over ψϕ] decays. Assuming approximate SU(3) flavour symmetry and neglecting higher order diagrams, the shift in the CP-violating phase [subscript ϕs] is limited to be within the interval [−1.05°,+1.18°] at 95% confidence level. Changes to the limit due to SU(3) symmetry breaking effects are also discussed.
MIT Department
Massachusetts Institute of Technology. Department of Physics
Massachusetts Institute of Technology. Laboratory for Nuclear Science
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DOI of Published Version
https://doi.org/10.1016/j.physletb.2015.01.008
