Measurement of $CP$ asymmetry in $D^0 \rightarrow K^- K^+$ and $D^0 \rightarrow π^- π^+$ decays
Time-integrated $CP$ asymmetries in $D^0$ decays to the final states $K^- K^+$ and $\pi^- \pi^+$ are measured using proton-proton collisions corresponding to $3\mathrm{\,fb}^{-1}$ of integrated luminosity collected at centre-of-mass energies of $7\mathrm{\,Te\kern -0.1em V}$ and $8\mathrm{\,Te\kern...
| Main Authors: | , , , , , , , , , , , , , , , , , , , , , , , , |
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| Format: | Journal article |
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2014
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| _version_ | 1797103156242415616 |
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| author | collaboration, L Aaij, R Adeva, B Adinolfi, M Affolder, A Ajaltouni, Z Albrecht, J Alessio, F Alexander, M Ali, S Alkhazov, G Cartelle, P Jr, A Amato, S Amerio, S Amhis, Y An, L Anderlini, L Anderson, J Andreassen, R Andreotti, M Andrews, J Appleby, R Gutierrez, O Archilli, F |
| author_facet | collaboration, L Aaij, R Adeva, B Adinolfi, M Affolder, A Ajaltouni, Z Albrecht, J Alessio, F Alexander, M Ali, S Alkhazov, G Cartelle, P Jr, A Amato, S Amerio, S Amhis, Y An, L Anderlini, L Anderson, J Andreassen, R Andreotti, M Andrews, J Appleby, R Gutierrez, O Archilli, F |
| author_sort | collaboration, L |
| collection | OXFORD |
| description | Time-integrated $CP$ asymmetries in $D^0$ decays to the final states $K^- K^+$ and $\pi^- \pi^+$ are measured using proton-proton collisions corresponding to $3\mathrm{\,fb}^{-1}$ of integrated luminosity collected at centre-of-mass energies of $7\mathrm{\,Te\kern -0.1em V}$ and $8\mathrm{\,Te\kern -0.1em V}$. 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 \begin{align} \Delta A_{CP} = A_{CP}(K^-K^+)-A_{CP}(\pi^-\pi^+) = (+0.14 \pm 0.16\mathrm{\,(stat)} \pm 0.08\mathrm{\,(syst)})\% \ . \nonumber \end{align} 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 \begin{align} A_{CP}(K^-K^+) = (-0.06 \pm 0.15\mathrm{\,(stat)} \pm 0.10\mathrm{\,(syst)}) \% \ ,\nonumber \end{align} where the correlation coefficient between $\Delta A_{CP}$ and $A_{CP}(K^-K^+)$ is $\rho=0.28$. By combining these results, the $CP$ asymmetry in the $D^0\rightarrow\pi^-\pi^+$ channel is $A_{CP}(\pi^-\pi^+)=(-0.20\pm0.19\mathrm{\,(stat)}\pm0.10\mathrm{\,(syst)})\%$. |
| first_indexed | 2024-03-07T06:16:05Z |
| format | Journal article |
| id | oxford-uuid:f11eadf8-25fd-4404-980f-350d4c23f9a2 |
| institution | University of Oxford |
| last_indexed | 2024-03-07T06:16:05Z |
| publishDate | 2014 |
| record_format | dspace |
| spelling | oxford-uuid:f11eadf8-25fd-4404-980f-350d4c23f9a22022-03-27T11:53:40ZMeasurement of $CP$ asymmetry in $D^0 \rightarrow K^- K^+$ and $D^0 \rightarrow π^- π^+$ decaysJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:f11eadf8-25fd-4404-980f-350d4c23f9a2Symplectic Elements at Oxford2014collaboration, LAaij, RAdeva, BAdinolfi, MAffolder, AAjaltouni, ZAlbrecht, JAlessio, FAlexander, MAli, SAlkhazov, GCartelle, PJr, AAmato, SAmerio, SAmhis, YAn, LAnderlini, LAnderson, JAndreassen, RAndreotti, MAndrews, JAppleby, RGutierrez, OArchilli, FTime-integrated $CP$ asymmetries in $D^0$ decays to the final states $K^- K^+$ and $\pi^- \pi^+$ are measured using proton-proton collisions corresponding to $3\mathrm{\,fb}^{-1}$ of integrated luminosity collected at centre-of-mass energies of $7\mathrm{\,Te\kern -0.1em V}$ and $8\mathrm{\,Te\kern -0.1em V}$. 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 \begin{align} \Delta A_{CP} = A_{CP}(K^-K^+)-A_{CP}(\pi^-\pi^+) = (+0.14 \pm 0.16\mathrm{\,(stat)} \pm 0.08\mathrm{\,(syst)})\% \ . \nonumber \end{align} 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 \begin{align} A_{CP}(K^-K^+) = (-0.06 \pm 0.15\mathrm{\,(stat)} \pm 0.10\mathrm{\,(syst)}) \% \ ,\nonumber \end{align} where the correlation coefficient between $\Delta A_{CP}$ and $A_{CP}(K^-K^+)$ is $\rho=0.28$. By combining these results, the $CP$ asymmetry in the $D^0\rightarrow\pi^-\pi^+$ channel is $A_{CP}(\pi^-\pi^+)=(-0.20\pm0.19\mathrm{\,(stat)}\pm0.10\mathrm{\,(syst)})\%$. |
| spellingShingle | collaboration, L Aaij, R Adeva, B Adinolfi, M Affolder, A Ajaltouni, Z Albrecht, J Alessio, F Alexander, M Ali, S Alkhazov, G Cartelle, P Jr, A Amato, S Amerio, S Amhis, Y An, L Anderlini, L Anderson, J Andreassen, R Andreotti, M Andrews, J Appleby, R Gutierrez, O Archilli, F Measurement of $CP$ asymmetry in $D^0 \rightarrow K^- K^+$ and $D^0 \rightarrow π^- π^+$ decays |
| title | Measurement of $CP$ asymmetry in $D^0 \rightarrow K^- K^+$ and $D^0
\rightarrow π^- π^+$ decays |
| title_full | Measurement of $CP$ asymmetry in $D^0 \rightarrow K^- K^+$ and $D^0
\rightarrow π^- π^+$ decays |
| title_fullStr | Measurement of $CP$ asymmetry in $D^0 \rightarrow K^- K^+$ and $D^0
\rightarrow π^- π^+$ decays |
| title_full_unstemmed | Measurement of $CP$ asymmetry in $D^0 \rightarrow K^- K^+$ and $D^0
\rightarrow π^- π^+$ decays |
| title_short | Measurement of $CP$ asymmetry in $D^0 \rightarrow K^- K^+$ and $D^0
\rightarrow π^- π^+$ decays |
| title_sort | measurement of cp asymmetry in d 0 rightarrow k k and d 0 rightarrow π π decays |
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