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Search for CP violation in D ± → K S 0 K ± and D s ± → K S 0 π ± decays
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LHCb Collaboration (Including: Back, J. J., Blake, Thomas, Craik, Daniel, Dossett, D., Gershon, T. J., Kreps, Michal, Latham, Thomas, O'Hanlon, Daniel P., Pilar, T., Poluektov, Anton, Reid, Matthew M., Silva Coutinho, R., Wallace, Charlotte, Whitehead, M. (Mark) and Langenbruch, Christoph). (2014) Search for CP violation in D ± → K S 0 K ± and D s ± → K S 0 π ± decays. Journal of High Energy Physics, Volume 2014 (Number 10). Article number 25. doi:10.1007/JHEP10(2014)025
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Official URL: http://dx.doi.org/10.1007/JHEP10(2014)025
Abstract
A search for CP violation in Cabibbo-suppressed D ± → K S 0 K ± and D s ± → K S 0 π ± decays is performed using pp collision data, corresponding to an integrated luminosity of 3 fb, recorded by the LHCb experiment. The individual CP-violating asymmetries are measured to be
AD±CP→K0SK±=(+0.03±0.17±0.14)%AD±sCP→K0Sπ±=(+0.38±0.46±0.17)%,
assuming that CP violation in the Cabibbo-favoured decays is negligible. A combination of the measured asymmetries for the four decay modes D (s) ± → K S 0 K ± and D (s) ± → K S 0 π ± gives the sum
AD±→K0SK±CP+AD±s→K0Sπ±CP=(+0.41±0.49±0.26)%.
In all cases, the first uncertainties are statistical and the second systematic. The results represent the most precise measurements of these asymmetries to date and show no evidence for CP violation.
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