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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Main Authors: Counts, Ian Thomas Hunt, Williams, Michael, Ilten, Philip J
Other Authors: Massachusetts Institute of Technology. Department of Physics
Format: Article
Language:en_US
Published: Springer-Verlag 2014
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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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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AT williamsmichael measurementofcpasymmetryindsuperscript0ksuperscriptksuperscriptanddsuperscript0psuperscriptpsuperscriptdecays
AT iltenphilipj measurementofcpasymmetryindsuperscript0ksuperscriptksuperscriptanddsuperscript0psuperscriptpsuperscriptdecays