- Main
Measurement of D0-D̄0 mixing using the ratio of lifetimes for the decays D0→K-π+ and K+K-
- Author(s): Aubert, B
- Karyotakis, Y
- Lees, JP
- Poireau, V
- Prencipe, E
- Prudent, X
- Tisserand, V
- Tico, JG
- Grauges, E
- Martinelli, M
- Palano, A
- Pappagallo, M
- Eigen, G
- Stugu, B
- Sun, L
- Battaglia, M
- Brown, DN
- Hooberman, B
- Kerth, LT
- Kolomensky, YG
- Lynch, G
- Osipenkov, IL
- Tackmann, K
- Tanabe, T
- Hawkes, CM
- Soni, N
- Watson, AT
- Koch, H
- Schroeder, T
- Asgeirsson, DJ
- Hearty, C
- Mattison, TS
- McKenna, JA
- Barrett, M
- Khan, A
- Randle-Conde, A
- Blinov, VE
- Bukin, AD
- Buzykaev, AR
- Druzhinin, VP
- Golubev, VB
- Onuchin, AP
- Serednyakov, SI
- Skovpen, YI
- Solodov, EP
- Todyshev, KY
- Bondioli, M
- Curry, S
- Eschrich, I
- Kirkby, D
- Lankford, AJ
- Lund, P
- Mandelkern, M
- Martin, EC
- Stoker, DP
- Atmacan, H
- Gary, JW
- Liu, F
- Long, O
- Vitug, GM
- Yasin, Z
- Sharma, V
- Campagnari, C
- Hong, TM
- Kovalskyi, D
- Mazur, MA
- Richman, JD
- Beck, TW
- Eisner, AM
- Heusch, CA
- Kroseberg, J
- Lockman, WS
- Martinez, AJ
- Schalk, T
- Schumm, BA
- Seiden, A
- Wang, L
- Winstrom, LO
- Cheng, CH
- Doll, DA
- Echenard, B
- Fang, F
- Hitlin, DG
- Narsky, I
- Ongmongkolkul, P
- Piatenko, T
- Porter, FC
- Andreassen, R
- Mancinelli, G
- Meadows, BT
- Mishra, K
- Sokoloff, MD
- Bloom, PC
- Ford, WT
- Gaz, A
- Hirschauer, JF
- Nagel, M
- Nauenberg, U
- Smith, JG
- Wagner, SR
- et al.
Abstract
We measure the rate of D0-D̄0 mixing with the observable yCP=(τKπ/τKK)-1, where τKK and τKπ are, respectively, the mean lifetimes of CP-even D0→K+K- and CP-mixed D0→K-π+ decays, using a data sample of 384fb-1 collected by the BABAR detector at the SLAC PEP-II asymmetric-energy B Factory. From a sample of D0 and D̄0 decays where the initial flavor of the decaying meson is not determined, we obtain yCP=[1.12±0.26(stat)±0.22(syst)]%, which excludes the no-mixing hypothesis at 3.3σ, including both statistical and systematic uncertainties. This result is in good agreement with a previous BABAR measurement of yCP obtained from a sample of D*+→D0π+ events, where the D0 decays to K-π+, K+K-, and π+π-, which is disjoint with the untagged D0 events used here. Combining the two results taking into account statistical and systematic uncertainties, where the systematic uncertainties are assumed to be 100% correlated, we find yCP=[1.16±0.22(stat)±0. 18(syst)]%, which excludes the no-mixing hypothesis at 4.1σ. © 2009 The American Physical Society.
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