Measurement of the CKM Angle γ Using B[superscript ±] → DK[superscript ±] with D → K[superscript S][superscript 0]π[superscript +]π[superscript −], K[subscript S][superscript 0]K[superscript +]K[superscript −] Decays
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Author(s)
Aaij, R.
Adeva, B.
Adinolfi, M.
Aidala, C. A
Ajaltouni, Z.
Akar, S.
Albicocco, P.
Albrecht, J.
Alessio, F.
Alexander, M.
Date Issued
August 2018
Journal
Journal of High Energy Physics
Publisher
Springer Berlin Heidelberg
Citation
The LHCb collaboration, et al. “Measurement of the CKM Angle γ Using B[superscript ±] → DK[superscript ±] with D → K[superscript S][superscript 0]π[superscript +]π[superscript −], K[subscript S][superscript 0]K[superscript +]K[superscript −] Decays.” Journal of High Energy Physics, vol. 2018, no. 8, Aug. 2018.
Version
Final published version
Abstract
A binned Dalitz plot analysis of B[superscript ±] → DK[superscript ±] decays, with D → K[subscript S][superscript 0]π[superscript +]π[superscript −] and D → K[subscript S][superscript 0]K[superscript +]K[superscript −], is used to perform a measurement of the CP-violating observables x[subscript ±] and y[subscript ±], which are sensitive to the Cabibbo-Kobayashi-Maskawa angle γ. The analysis is performed without assuming any D decay model, through the use of information on the strong-phase variation over the Dalitz plot from the CLEO collaboration. Using a sample of proton-proton collision data collected with the LHCb experiment in 2015 and 2016, and corresponding to an integrated luminosity of 2.0 fb[superscript −1], the values of the CP violation parameters are found to be x[subscript −] = (9.0 ± 1.7 ± 0.7 ± 0.4) × 10[superscript −2], y[subscript −] = (2.1 ± 2.2 ± 0.5 ± 1.1) × 10[superscript −2], x[subscript +] = (−7.7 ± 1.9 ± 0.7 ± 0.4) × 10[superscript −2], and y[subscript +] = (−1.0 ± 1.9 ± 0.4 ± 0.9) × 10[superscript −2]. The first uncertainty is statistical, the second is systematic, and the third is due to the uncertainty (on the strong-phase measurements. These values are used to obtain γ = (87[subscript − 12][superscript + 11])[superscript ∘], r[subscript B] = 0.086[subscript − 0.014][superscript + 0.013], and δ[superscript B] = (101±11)°, where r[subscript B] is the ratio between the suppressed and favoured B-decay amplitudes and δ[subscript B] is the corresponding strong-interaction phase difference. This measurement is combined with the result obtained using 2011 and 2012 data collected with the LHCb experiment, to give γ = (80[subscript − 9][superscript + 10])[superscript ∘], r[subscript B] = 0.080 ± 0.011, and δB = (110 ± 10)°. Keywords: B physics, CKM angle gamma, CP violation, Flavor physics, Hadron-Hadron scattering (experiments)
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/10.1007/JHEP08(2018)176
