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

0382479 - FZÚ 2013 RIV US eng J - Journal Article
Aaltonen, T. - Gonzalez, B.A. - Amerio, S. - Lysák, Roman … Total 474 authors
Measurement of CP-violating asymmetries in D-0 -> pi(+) pi(-) and D-0 -> K+ K- decays at CDF.
Physical Review D: Particles, Fields, Gravitation and Cosmology. Roč. 85, č. 1 (2012), "012009-1"-"012009-28". ISSN 1550-7998
R&D Projects: GA MŠMT LC527
Institutional research plan: CEZ:AV0Z10100502
Keywords : D0 hadronic decay * CP violation * K- decay * asymmetry CP measured * CDF * D0 --> pi+ pi- * D0 --> K+ K-
Subject RIV: BF - Elementary Particles and High Energy Physics
Impact factor: 4.691, year: 2012

We report on a measurement of CP-violating asymmetries (Acp) in the Cabibbo-suppressed D0 --> pi+ pi- and D0 --> K+K- decays reconstructed in a data sample corresponding to 5.9 fb-1 of integrated luminosity collected by the upgraded Collider Detector at Fermilab. We use the strong decay D*+ --> D0 pi+ to identify the flavor of the charmed meson at production and exploit CP-conserving strong c-cbar pair-production in p-pbar collisions. High-statistics samples of Cabibbo-favored D0 --> K- p+ decays with and without a D* tag are used to correct for instrumental effects and significantly reduce systematic uncertainties. We measure Acp(D0 --> pi+ pi-) = (+0.22 +- 0.24 (stat) +- 0.11 (syst))% and Acp(D 0 --> K+ K-) = (-0.24 +- 0.22 (stat) +- 0.09 (syst))%, in agreement with CP conservation. These are the most precise determinations from a single experiment to date.
Permanent Link: http://hdl.handle.net/11104/0212688