Measurement of the Difference of Time-Integrated CP Asymmetries in D0 → K-K+ and D0 → π-π + Decays

• Published in: Physical review letters 2016-05, Vol.116 (19)
• Main Authors: Garrido Beltrán, Lluís, Gascón Fora, David, Graciani Díaz, Ricardo, Graugés Pous, Eugeni, Marín Benito, Carla, Picatoste Olloqui, Eduardo, Rives Molina, Vicente José, Badalov, Alexey, LHCb Collaboration
• Format: Article
• Language: English
• Subjects: CP violation (Nuclear physics); Mesons (Física nuclear); Mesons (Nuclear physics); PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; Simetria (Física); Symmetry (Physics); Violació CP (Física nuclear)
• ISSN: 0031-9007; 1079-7114
• DOI: 10.1103/PhysRevLett.116.191601

A search for CP violation in D-0 -> K-K+ and D-0 -> pi(-)pi(+) decays is performed using pp collision data, corresponding to an integrated luminosity of 3 fb(-1), collected using the LHCb detector at center-of-mass energies of 7 and 8 TeV. The flavor of the charm meson is inferred from the charge of the pion in D*(+) -> D-0 pi(+) and D*(-) -> (D) over bar (0)pi(-) decays. The difference between the CP asymmetries in D-0 -> K-K+ and D-0 -> pi(-)pi(+) decays, Delta A(CP) A(CP)(K-K+) - A(CP)(pi(-)pi(+)), is measured to be [-0.10 +/- 0.08(stat) +/- 0.03(syst)]%. This is the most precise measurement of a time-integrated CP asymmetry in the charm sector from a single experiment.