Measurement of CP asymmetry in D[superscript 0] → K[superscript −]K[superscript +] and D[superscript 0] → π[superscript −]π[superscript +] decays
Time-integrated CP asymmetries in D [superscript 0] decays to the final states K [superscript −] K [superscript +] and π [superscript −] π [superscript +] are measured using proton-proton collisions corresponding to 3 fb[superscript −1] of integrated luminosity collected at centre-of-mass energies o...
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Springer-Verlag
2014
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Online Access: | http://hdl.handle.net/1721.1/89441 https://orcid.org/0000-0001-8285-3346 https://orcid.org/0000-0002-4670-1334 https://orcid.org/0000-0001-5534-1732 |
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author | Counts, Ian Thomas Hunt Williams, Michael Ilten, Philip J |
author2 | Massachusetts Institute of Technology. Department of Physics |
author_facet | Massachusetts Institute of Technology. Department of Physics Counts, Ian Thomas Hunt Williams, Michael Ilten, Philip J |
author_sort | Counts, Ian Thomas Hunt |
collection | MIT |
description | Time-integrated CP asymmetries in D [superscript 0] decays to the final states K [superscript −] K [superscript +] and π [superscript −] π [superscript +] are measured using proton-proton collisions corresponding to 3 fb[superscript −1] of integrated luminosity collected at centre-of-mass energies of 7 TeV and 8 TeV. The D [superscript 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 ΔA[subscript CP] =A[subscript CP](K[superscript −]K[superscript +]) − A[subscript CP](π[superscript −]π[superscript +]) = (+0.14 ± 0.16 (stat) ± 0.08(syst))%. A measurement of A [subscript CP] (K [superscript −] K [superscript +]) is obtained assuming negligible CP violation in charm mixing and in Cabibbo-favoured D decays. It is found to be A[superscript CP](K[superscript −]K[superscript +]) = (−0.06 ± 0.15(stat) ± 0.10(syst))%, where the correlation coefficient between ΔA [subscript CP] and A [subscript CP] (K [superscript −] K [superscript +]) is ρ = 0.28. By combining these results, the CP asymmetry in the D [superscript 0] → π [superscript −] π [superscript +] channel is A [subscript CP] (π [superscript −] π [superscript +]) = (−0.20 ± 0.19 (stat) ± 0.10 (syst))%. |
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id | mit-1721.1/89441 |
institution | Massachusetts Institute of Technology |
language | en_US |
last_indexed | 2024-09-23T12:46:47Z |
publishDate | 2014 |
publisher | Springer-Verlag |
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spelling | mit-1721.1/894412023-02-26T10:26:20Z Measurement of CP asymmetry in D[superscript 0] → K[superscript −]K[superscript +] and D[superscript 0] → π[superscript −]π[superscript +] decays Counts, Ian Thomas Hunt Williams, Michael Ilten, Philip J Massachusetts Institute of Technology. Department of Physics Massachusetts Institute of Technology. Laboratory for Nuclear Science Counts, Ian Thomas Hunt Ilten, Philip James Williams, Michael Time-integrated CP asymmetries in D [superscript 0] decays to the final states K [superscript −] K [superscript +] and π [superscript −] π [superscript +] are measured using proton-proton collisions corresponding to 3 fb[superscript −1] of integrated luminosity collected at centre-of-mass energies of 7 TeV and 8 TeV. The D [superscript 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 ΔA[subscript CP] =A[subscript CP](K[superscript −]K[superscript +]) − A[subscript CP](π[superscript −]π[superscript +]) = (+0.14 ± 0.16 (stat) ± 0.08(syst))%. A measurement of A [subscript CP] (K [superscript −] K [superscript +]) is obtained assuming negligible CP violation in charm mixing and in Cabibbo-favoured D decays. It is found to be A[superscript CP](K[superscript −]K[superscript +]) = (−0.06 ± 0.15(stat) ± 0.10(syst))%, where the correlation coefficient between ΔA [subscript CP] and A [subscript CP] (K [superscript −] K [superscript +]) is ρ = 0.28. By combining these results, the CP asymmetry in the D [superscript 0] → π [superscript −] π [superscript +] channel is A [subscript CP] (π [superscript −] π [superscript +]) = (−0.20 ± 0.19 (stat) ± 0.10 (syst))%. National Science Foundation (U.S.) 2014-09-11T16:51:47Z 2014-09-11T16:51:47Z 2014-07 2014-05 Article http://purl.org/eprint/type/JournalArticle 1029-8479 1126-6708 http://hdl.handle.net/1721.1/89441 Aaij, R., B. Adeva, M. Adinolfi, A. Affolder, Z. Ajaltouni, J. Albrecht, F. Alessio, et al. “Measurement of CP asymmetry in D[superscript 0] → K[superscript −]K[superscript +] and D[superscript 0] → π[superscript −]π[superscript +] decays.” J. High Energ. Phys. 2014, no. 7 (July 2014). © CERN, for the benefit of the LHCb Collaboration https://orcid.org/0000-0001-8285-3346 https://orcid.org/0000-0002-4670-1334 https://orcid.org/0000-0001-5534-1732 en_US http://dx.doi.org/10.1007/JHEP07(2014)041 Journal of High Energy Physics Creative Commons Attribution http://creativecommons.org/licenses/by/4.0/ application/pdf Springer-Verlag Springer-Verlag |
spellingShingle | Counts, Ian Thomas Hunt Williams, Michael Ilten, Philip J Measurement of CP asymmetry in D[superscript 0] → K[superscript −]K[superscript +] and D[superscript 0] → π[superscript −]π[superscript +] decays |
title | Measurement of CP asymmetry in D[superscript 0] → K[superscript −]K[superscript +] and D[superscript 0] → π[superscript −]π[superscript +] decays |
title_full | Measurement of CP asymmetry in D[superscript 0] → K[superscript −]K[superscript +] and D[superscript 0] → π[superscript −]π[superscript +] decays |
title_fullStr | Measurement of CP asymmetry in D[superscript 0] → K[superscript −]K[superscript +] and D[superscript 0] → π[superscript −]π[superscript +] decays |
title_full_unstemmed | Measurement of CP asymmetry in D[superscript 0] → K[superscript −]K[superscript +] and D[superscript 0] → π[superscript −]π[superscript +] decays |
title_short | Measurement of CP asymmetry in D[superscript 0] → K[superscript −]K[superscript +] and D[superscript 0] → π[superscript −]π[superscript +] decays |
title_sort | measurement of cp asymmetry in d superscript 0 k superscript k superscript and d superscript 0 π superscript π superscript decays |
url | http://hdl.handle.net/1721.1/89441 https://orcid.org/0000-0001-8285-3346 https://orcid.org/0000-0002-4670-1334 https://orcid.org/0000-0001-5534-1732 |
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