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Measurement of CP-violating asymmetries in D0?p ⁺p ^- and D0?K ⁺K ^- decays at CDF Measurement of C P -violating asymmetries in D 0 ? ? + ? ? and D 0 ? K + K ? decays at CDF

Abstract: We report on a measurement of CP-violating asymmetries (ACP) in the Cabibbo-suppressed D0 ! þ and D0 ! KþK decays reconstructed in a data sample corresponding to 5:9 fb1 of integrated luminosity collected by the upgraded Collider Detector at Fermilab. We use the strong decay Dþ ! D0þ to identify the flavor of the charmed meson at production and exploit CP-conserving strong cc pair production in pp collisions. High-statistics samples of Cabibbo-favored D0 ! Kþ decays with and without a D tag are used to correct for instrumental effects and significantly reduce systematic uncertainties. We measure ACPðD0 ! þÞ ¼ ðþ0:22 0:24ðstatÞ 0:11ðsystÞÞ% and ACPðD0 ! KþKÞ ¼ ð0:24 0:22ðstatÞ 0:09ðsystÞÞ%, 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 ! þ and D0 ! KþK decays, the results provide an upper limit to the CP-violating asymmetry in D0 mixing, jAind CPðD0Þj < 0:13% at the 90% confidence level.

Authorship: Aaltonen T., Alvarez González B., Amerio S., Amidei D., Anastassov A., Annovi A., Antos J., Apollinari G., Appel J.A., Arisawa T., Artikov A., Asaadi J., Ashmanskas W., Auerbach B., Aurisano A., Azfar F., Badgett W., Bae T., Barbaro-Galtieri A., Barnes V.E., Barnett B.A., Barria P., Bartos P., Bauce M., Bedeschi F., Behari S., Bellettini G., Bellinger J., Benjamin D., Beretvas A., Bhatti A., Bisello D., Bizjak I., Bland K.R., Bl

Fuente: Physical Review D - Particles, Fields, Gravitation and Cosmology, 2012, 85(1), 012009

Publisher: American Physical Society

Publication date: 01/01/2012

No. of pages: 28

Publication type: Article

DOI: 10.1103/PhysRevD.85.012009

ISSN: 1550-7998,1550-2368,2470-0010,2470-0029

Publication Url: https://doi.org/10.1103/PhysRevD.85.012009

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