2014/11/08 by N. K. Nisar, Nisar, N. K.
Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Experiment (hep-ex) #High-Energy Particle Collisions Research #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-ex
paper · pdf · doi:10.48550/arxiv.1411.2083
arxiv created 2014/11/08 · openalex publication_date 2014/11/08 · arxiv updated 2014/11/11 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We report the results on D0-D0 mixing in the decays of D0→ K+π- and D0→ KS0π+π-, and CP violation in D0→π0π0 using a data sample with an integrated luminosity of about 1~ab-1 recorded with the Belle detector, at different center of mass energies. The mixing is observed in D0→ K+π- with the mixing parameters x'2=(0.09± 0.22)× 10-3, y'=(4.6± 3.4)× 10-3 and the ratio of doubly Cabibbo-suppressed to Cabibbo-favored decay rates RD=(3.53±0.13)× 10-3, where the quoted uncertainties combine both statistical and systematic contributions. For the D0→ KS0π+π- decay, assuming CP conservation we measure mixing parameters x=(0.56± 0.19+0.03+0.06-0.09-0.09)% and y=(0.30± 0.15+0.04+0.03-0.05-0.06)%, where the uncertainties are statistical, experimental systematics, and that due to amplitude model. We measure the mixing parameters allowing CP violation for this decay mode, and obtain |q/p|=0.90+0.16+0.05+0.06-0.15-0.04-0.05 and arg(q/p)=(-6± 11 ±3+3-4)∘ that are consistent with no CP violation. The time-integrated CP asymmetry in the decay D0→π0π0 is measured to be, [-0.03± 0.64(stat) ± 0.10(syst)]%, consistent with CP conservation. We also present an updated measurement of CP asymmetry in D0→ KS0π0.