A binned Dalitz plot analysis of B± → D K± decays, with D → K0S π+ π− and D → K0S K+ K−, is used to perform a measurement of the CP-violating observables x± and y±, 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^−1, the values of the CP violation parameters are found to be x− = (9.0 ± 1.7 ± 0.7 ± 0.4) × 10^−2, y− = (2.1 ± 2.2 ± 0.5 ± 1.1) × 10^−2, x+ = (−7.7 ± 1.9 ± 0.7 ± 0.4) × 10^−2, and y+ = (−1.0 ± 1.9 ± 0.4 ± 0.9) × 10^−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{−12}{+11})∘, r_B = 0.086{−0.014}{+0.013}, and δ_B = (101 ± 11)°, where r_B is the ratio between the suppressed and favoured B-decay amplitudes and δ_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{−9}{+10})∘, r_B = 0.080 ± 0.011, and δ_B = (110 ± 10)°.

Aaij, R., Adeva, B., Adinolfi, M., Aidala, C., Ajaltouni, Z., Akar, S., et al. (2018). Measurement of the CKM Angle γ Using B± → D K± With D → K0S π+ π−, K0S K+ K− Decays. JOURNAL OF HIGH ENERGY PHYSICS, 2018(8), 0-35 [10.1007/JHEP08(2018)176].

Measurement of the CKM Angle γ Using B± → D K± With D → K0S π+ π−, K0S K+ K− Decays

Betti, F.;CAPRIOTTI, LORENZO;Carbone, A.;Ferrari, F.;Galli, D.;MARCONI, UMBERTO;Patrignani, C.;Perazzini, S.;Pisani, F.;Vagnoni, V.;Zucchelli, S.
2018

Abstract

A binned Dalitz plot analysis of B± → D K± decays, with D → K0S π+ π− and D → K0S K+ K−, is used to perform a measurement of the CP-violating observables x± and y±, 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^−1, the values of the CP violation parameters are found to be x− = (9.0 ± 1.7 ± 0.7 ± 0.4) × 10^−2, y− = (2.1 ± 2.2 ± 0.5 ± 1.1) × 10^−2, x+ = (−7.7 ± 1.9 ± 0.7 ± 0.4) × 10^−2, and y+ = (−1.0 ± 1.9 ± 0.4 ± 0.9) × 10^−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{−12}{+11})∘, r_B = 0.086{−0.014}{+0.013}, and δ_B = (101 ± 11)°, where r_B is the ratio between the suppressed and favoured B-decay amplitudes and δ_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{−9}{+10})∘, r_B = 0.080 ± 0.011, and δ_B = (110 ± 10)°.
2018
Aaij, R., Adeva, B., Adinolfi, M., Aidala, C., Ajaltouni, Z., Akar, S., et al. (2018). Measurement of the CKM Angle γ Using B± → D K± With D → K0S π+ π−, K0S K+ K− Decays. JOURNAL OF HIGH ENERGY PHYSICS, 2018(8), 0-35 [10.1007/JHEP08(2018)176].
Aaij, R.; Adeva, B.; Adinolfi, M.; Aidala, C.A.; Ajaltouni, Z.; Akar, S.; Albicocco, P.; Albrecht, J.; Alessio, F.; Alexander, M.; Alfonso Albero, A.;...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/641958
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