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We observe evidence for D0-D̄0 mixing by measuring the difference in the apparent lifetime when a D0 meson decays to the CP eigenstates K+K- and π+π- and when it decays to the final state K-π+. We find the relative difference of the lifetimes yCP to be [1.31±0.32(stat)±0.25(syst)] %, 3.2 standard deviations from zero. We also search for a CP asymmetry between D0 and D̄0 decays; no evidence for CP violation is found. These results are based on 540fb-1 of data recorded by the Belle detector at the KEKB e+e- collider. © 2007 The American Physical Society.
Olivier Schneider, Aurelio Bay, Guido Haefeli, Tatsuya Nakada, Frédéric Blanc, Lesya Shchutska, Elena Graverini, Marie Theres Christin Bachmayer, Aravindhan Venkateswaran, Yunxuan Song, Luis Miguel Garcia Martin, Vitalii Lisovskyi, Sonia Amina Bouchiba, Serhii Cholak, Federico Ronchetti, Anni Matilda Kauniskangas, Raphaël van Laak, Ettore Zaffaroni, Pierre Paul Louis Mayencourt, Arnaud Merlin Gauthey, Gianluca Zunica, Abdul-Kerim Guseinov, Radoslav Marchevski, Roberto Ribatti, Dimitrios Kaminaris, Spencer Edward Collaviti, Julius Christian Daniel Schulte
Jan Steggemann, Konstantin Androsov, Anna Mascellani