2015/08/27 by Sabato Leo, Leo, Sabato
Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Experiment (hep-ex) #Radioactive Decay and Measurement Techniques
paper · pdf · doi:10.48550/arxiv.1508.07048
openalex publication_date 2015/08/27 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
I discuss the measurement of CP-violating asymmetries (AΓ) between effective lifetimes of D0 or D0 mesons. Fully reconstructed D0→ K+ K- and D0→ π+π- decays collected in pp collisions by the Collider Detector at Fermilab experiment and corresponding to a data set of 9.7~fb-1 of integrated luminosity are used. The flavor of the charm meson at production is determined by exploiting the decay D*+ → D0 π+. Contamination from mesons originated in b-hadron decays is subtracted from the sample. Signal yields as functions of the observed decay-time distributions are determined using likelihood fits and used to measure the asymmetries. The results, AΓ(K+K-) = (-1.9 ± 1.5~(stat) ± 0.4~(syst) )×10-3 and AΓ(π+π-)= (-0.1 ± 1.8~(stat) ± 0.3~(syst) )×10-3, and their combination, AΓ= (-1.2 ± 1.2 )×10-3, are consistent with the SM predictions and other experimental determinations.