Measurement of CP asymmetry in D 0 → K − K + and D 0 → π − π + decays
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| Title: | Measurement of CP asymmetry in D 0 → K − K + and D 0 → π − π + decays |
| Author: | LHCb Collaboration Adeva Andany, Bernardo Álvarez Cartelle, Paula Dosil Suárez, Álvaro Fernández Albor, Víctor Manuel Gallas Torreira, Abraham Antonio Hernando Morata, José Ángel Pazos Álvarez, Antonio Pérez Trigo, Eliseo Plo Casasus, Máximo Romero Vidal, Antonio Saborido Silva, Juan José Sanmartín Sedes, Brais Santamarina Ríos, Cibrán Seco Miguélez, Marcos Antonio Vázquez Regueiro, Pablo Vázquez Sierra, Carlos Vieites Díaz, María |
| Affiliation: | Universidade de Santiago de Compostela. Departamento de Física de Partículas Universidade de Santiago de Compostela. Instituto Galego de Física de Altas Enerxías (IGFAE) |
| Subject: | CP violation | Charm physics | Flavor physics | Hadron-Hadron Scattering | |
| Date of Issue: | 2014 |
| Publisher: | Springer |
| Citation: | Aaij, R., Adeva, B., Adinolfi, M. et al. Measurement of CP asymmetry in D 0 → K − K + and D 0 → π − π + decays. J. High Energ. Phys. 2014, 41 (2014). https://doi.org/10.1007/JHEP07(2014)041 |
| Abstract: | Time-integrated CP asymmetries in D 0 decays to the final states K − K + and π − π + are measured using proton-proton collisions corresponding to 3fb−1 of integrated luminosity collected at centre-of-mass energies of 7 TeV and 8 TeV. The D 0 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 ΔACP=ACP(K−K+)−ACP(π−π+)=(+0.14±0.16 (stat)±0.08(syst))%. A measurement of A CP (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 ΔA CP and A CP (K − K +) is ρ = 0.28. By combining these results, the CP asymmetry in the D 0 → π − π + channel is A CP (π − π +) = (−0.20 ± 0.19 (stat) ± 0.10 (syst))%. |
| Publisher version: | https://doi.org/10.1007/JHEP07(2014)041 |
| URI: | http://hdl.handle.net/10347/21718 |
| DOI: | 10.1007/JHEP07(2014)041 |
| ISSN: | 1029-8479 |
| Rights: | © CERN, for the benefit of the LHCb Collaboration. Article funded by SCOAP3. This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0), which permits use, duplication, adaptation, distribution, and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made |
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Except where otherwise noted, this item's license is described as © CERN, for the benefit of the LHCb Collaboration. Article funded by SCOAP3. This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0), which permits use, duplication, adaptation, distribution, and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made