We report a direct measurement of D0-D̄0 mixing parameters through a time-dependent amplitude analysis of the Dalitz plots of D0→KS0π+π- and, for the first time, D0→KS0K+K- decays. The low-momentum pion πs+ in the decay D*+→D0πs+ identifies the flavor of the neutral D meson at its production. Using 468.5fb-1 of e +e- colliding-beam data recorded near √s=10.6GeV by the BABAR detector at the PEP-II asymmetric-energy collider at SLAC, we measure the mixing parameters x=[1.6±2.3(stat)±1.2(syst)±0.8(model) ]×10-3, and y=[5.7±2.0(stat)±1.3(syst)±0. 7(model)]×10-3. These results provide the best measurement to date of x and y. The knowledge of the value of x, in particular, is crucial for understanding the origin of mixing.

Sanchez, P., Lees, J., Poireau, V., Prencipe, E., Tisserand, V., Tico, J., et al. (2010). Measurement of D0-D̄0 mixing parameters using D0→KS0π+π- and D0→KS0K+K - decays. PHYSICAL REVIEW LETTERS, 105(8) [10.1103/PhysRevLett.105.081803].

Measurement of D0-D̄0 mixing parameters using D0→KS0π+π- and D0→KS0K+K - decays

CARPINELLI, Massimo
Membro del Collaboration Group
;
2010

Abstract

We report a direct measurement of D0-D̄0 mixing parameters through a time-dependent amplitude analysis of the Dalitz plots of D0→KS0π+π- and, for the first time, D0→KS0K+K- decays. The low-momentum pion πs+ in the decay D*+→D0πs+ identifies the flavor of the neutral D meson at its production. Using 468.5fb-1 of e +e- colliding-beam data recorded near √s=10.6GeV by the BABAR detector at the PEP-II asymmetric-energy collider at SLAC, we measure the mixing parameters x=[1.6±2.3(stat)±1.2(syst)±0.8(model) ]×10-3, and y=[5.7±2.0(stat)±1.3(syst)±0. 7(model)]×10-3. These results provide the best measurement to date of x and y. The knowledge of the value of x, in particular, is crucial for understanding the origin of mixing.
Articolo in rivista - Articolo scientifico
Hadrons; Amplitude analysis; Asymmetric energy; BaBar detector; Beam data; Collider; D-mesons; Direct measurement; Mixing parameters; Time-dependent; Mixing;
English
Carpinelli Massimo (BABAR Collaboration)
Sanchez, P., Lees, J., Poireau, V., Prencipe, E., Tisserand, V., Tico, J., et al. (2010). Measurement of D0-D̄0 mixing parameters using D0→KS0π+π- and D0→KS0K+K - decays. PHYSICAL REVIEW LETTERS, 105(8) [10.1103/PhysRevLett.105.081803].
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