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2014-07

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cc-by (c) Camboni, Alessandro et al., 2014
Please use this identifier to cite or link to this item: https://hdl.handle.net/2445/185626

Measurement of CP asymmetry in D-0 -> K- K+ and D-0 -> pi(-) pi(+) decays

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https://doi.org/10.1007/JHEP07(2014)041

Abstract

Time-integrated CP asymmetries in D0 decays to the final states K−K+ and π −π + are measured using proton-proton collisions corresponding to 3 fb−1 of integrated luminosity collected at centre-of-mass energies of 7 TeV and 8 TeV. The D0 mesons are produced in semileptonic b-hadron decays, where the charge of the accompanying muon is used to determine the initial flavour of the charm meson. The difference in CP asymmetries between the two final states is measured to be ∆ACP = ACP (K−K+) − ACP (π −π +) = (+0.14 ± 0.16 (stat) ± 0.08 (syst))% . A measurement of ACP (K−K+) is obtained assuming negligible CP violation in charm mixing and in Cabibbo-favoured D decays. It is found to be ACP (K−K+) = (−0.06 ± 0.15 (stat) ± 0.10 (syst))% , where the correlation coefficient between ∆ACP and ACP (K−K+) is ρ = 0.28. By combining these results, the CP asymmetry in the D0 → π −π + channel is ACP (π −π +) = (−0.20 ± 0.19 (stat) ± 0.10 (syst))%.

Subject

Hadrons, Gran Col·lisionador d'Hadrons, Física de partícules, Experiments

Subject (English)

Hadrons, Large Hadron Collider (France and Switzerland), Particle physics, Experiments

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Articles publicats en revistes (Física Quàntica i Astrofísica)

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CAMBONI, Alessandro, et al. Measurement of CP asymmetry in D-0 -> K- K+ and D-0 -> pi(-) pi(+) decays. Journal of High Energy Physics. 2014. Vol. 7, num. 41, pags. 1-26. ISSN 1126-6708. [consulted: 15 of August of 2026]. Available at: https://hdl.handle.net/2445/185626

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