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Measurement of indirect CP-violating asymmetries in D-0 -> K+K- and D-0 -> pi(+)pi(-) decays at CDF

Aaltonen, T; Amerio, S; Amidei, D; Anastassov, A; Annovi, A; Antos, J; Apollinari, G; ... CDF Collaboration; + view all (2014) Measurement of indirect CP-violating asymmetries in D-0 -> K+K- and D-0 -> pi(+)pi(-) decays at CDF. Physical Review D , 90 (11) , Article 111103(R). 10.1103/PhysRevD.90.111103. Green open access

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Abstract

We report a measurement of the indirect CP-violating asymmetries (AΓ) between effective lifetimes of anticharm and charm mesons reconstructed in D0→K+K− and D0→π+π− decays. We use the full data set of proton-antiproton collisions collected by the Collider Detector at Fermilab experiment and corresponding to 9.7 fb−1 of integrated luminosity. The strong-interaction decay D*+→D0π+ is used to identify the meson at production as D0 or D¯0. We statistically subtract D0 and D¯0 mesons originating from b-hadron decays and measure the yield asymmetry between anticharm and charm decays as a function of decay time. We measure AΓ(K+K−)=(−0.19±0.15(stat)±0.04(syst))% and AΓ(π+π−)=(−0.01±0.18(stat)±0.03(syst))%. The results are consistent with the hypothesis of CP symmetry and their combination yields AΓ=(−0.12±0.12)%.

Type: Article
Title: Measurement of indirect CP-violating asymmetries in D-0 -> K+K- and D-0 -> pi(+)pi(-) decays at CDF
Open access status: An open access version is available from UCL Discovery
DOI: 10.1103/PhysRevD.90.111103
Publisher version: http://dx.doi.org/10.1103/PhysRevD.90.111103
Language: English
Additional information: Copyright © 2014 American Physical Society.
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy
URI: https://discovery.ucl.ac.uk/id/eprint/1466290
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