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Measurement of CP violation and constraints on the CKM angle γ in B± → DK± with D → K0 Sπ+π−decays
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LHCb Collaboration (Including: Back, J. J., Blake, Thomas, Craik, Daniel, Dossett, D., Gershon, T. J., Kreps, Michal, Langenbruch, Christoph, Latham, Thomas, O'Hanlon, Daniel P., Pilar, T., Poluektov, Anton, Reid, Matthew M., Silva Coutinho, R., Wallace, Charlotte and Whitehead, M. (Mark)). (2014) Measurement of CP violation and constraints on the CKM angle γ in B± → DK± with D → K0 Sπ+π−decays. Nuclear Physics B, Volume 888 . pp. 169-193. doi:10.1016/j.nuclphysb.2014.09.015
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Official URL: http://dx.doi.org/10.1016/j.nuclphysb.2014.09.015
Abstract
A model-dependent amplitude analysis of B± → DK± with D → K0
Sπ+π− decays is performed using proton–proton collision data, corresponding to an integrated luminosity of 1 fb−1, recorded by LHCb at a centre-of-mass energy of 7 TeV in 2011. Values of the CP violation observables x± and y±, which are sensitive to the CKM angle γ, are measured to be
x− = +0.027 ± 0.044+0.010 −0.008 ± 0.001,
y− = +0.013 ± 0.048+0.009 −0.007 ± 0.003,
x+ = −0.084 ± 0.045 ± 0.009 ± 0.005,
y+ = −0.032 ± 0.048+0.010 −0.009 ± 0.008,
where the first uncertainty is statistical, the second systematic and the third arises from the uncertainty of the D → K0Sπ+π− amplitude model. The value of γ is determined to be (84+49−42)◦, including all sources of uncertainty. Neutral D meson mixing is found to have negligible effect.
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