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Open Access item Measurement of CP-violating asymmetries in D0→π +π - and D0→K +K - decays at CDF

Authors:Aaltonen, T.
Álvarez González, B.
Carrillo, S.
Casal, Bruno
Cuevas, Javier
Gómez, G.
Palencia, Enrique
Rodrigo, Teresa
Scodellaro, Luca
Issue Date:2012
Publisher:American Physical Society
Citation:Physical Review D 85(1): 012009 (2012)
Abstract:We report on a measurement of CP-violating asymmetries (A CP) in the Cabibbo-suppressed D0→π +Ï€ - and D0→K +K - decays reconstructed in a data sample corresponding to 5.9fb -1 of integrated luminosity collected by the upgraded Collider Detector at Fermilab. We use the strong decay D *+→D0Ï€ + to identify the flavor of the charmed meson at production and exploit CP-conserving strong ccÌ„ pair production in ppÌ„ collisions. High-statistics samples of Cabibbo-favored D0→K -Ï€ + decays with and without a D *± tag are used to correct for instrumental effects and significantly reduce systematic uncertainties. We measure A CP(D0→π +Ï€ -)=(+0.22±0.24(stat) ±0.11(syst))% and A CP(D0→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. Under the assumption of negligible direct CP violation in D0→π +Ï€ - and D0→K +K - decays, the results provide an upper limit to the CP-violating asymmetry in D0 mixing, |ACPind(D0)|<0.13% at the 90% confidence level. © 2012 American Physical Society.
Publisher version (URL):http://dx.doi.org/10.1103/PhysRevD.85.012009
Identifiers:doi: 10.1103/PhysRevD.85.012009
issn: 1550-7998
e-issn: 1550-2368
Appears in Collections:(IFCA) Artículos

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