Measurements of charm mixing and CP violation using D[superscript 0] → K[superscript ±]π[superscript ∓] decays
Measurements of charm mixing and CP violation parameters from the decay-time-dependent ratio of D[superscript 0]→K[superscript +]π[superscript -] to D[superscript 0]→K[superscript -]π[superscript +] decay rates and the charge-conjugate ratio are reported. The analysis uses [bar over B]→D[superscript...
| Main Authors: | , , |
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| Format: | Article |
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American Physical Society (APS)
2018
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| Online Access: | http://hdl.handle.net/1721.1/119438 https://orcid.org/0000-0001-5534-1732 https://orcid.org/0000-0001-8285-3346 |
| Summary: | Measurements of charm mixing and CP violation parameters from the decay-time-dependent ratio of D[superscript 0]→K[superscript +]π[superscript -] to D[superscript 0]→K[superscript -]π[superscript +] decay rates and the charge-conjugate ratio are reported. The analysis uses [bar over B]→D[superscript ∗+]μ[superscript -]X, and charge-conjugate decays, where D[superscript ∗+]→D[superscript 0]π[superscript +], and D[superscript 0]→K[superscript ∓]π[superscript ±]. The pp collision data are recorded by the LHCb experiment at center-of-mass energies √s=7 and 8 TeV, corresponding to an integrated luminosity of 3 fb-1. The data are analyzed under three hypotheses: (i) mixing assuming CP symmetry, (ii) mixing assuming no direct CP violation in the Cabibbo-favored or doubly Cabibbo-suppressed decay amplitudes, and (iii) mixing allowing either direct CP violation and/or CP violation in the superpositions of flavor eigenstates defining the mass eigenstates. The data are also combined with those from a previous LHCb study of D[superscript 0]→Kπ decays from a disjoint set of D[superscript ∗+] candidates produced directly in pp collisions. In all cases, the data are consistent with the hypothesis of CP symmetry. |
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