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Updated determination of D0 –¯D0 mixing and CP violation parameters with D0→K+ π- decays

MPS-Authors
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Dembinski,  H. P.
Division Prof. Dr. James A. Hinton, MPI for Nuclear Physics, Max Planck Society;

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Popov,  D.
Division Prof. Dr. James A. Hinton, MPI for Nuclear Physics, Max Planck Society;

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Schmelling,  M.
Division Prof. Dr. James A. Hinton, MPI for Nuclear Physics, Max Planck Society;

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Zavertiaev,  M.
Division Prof. Dr. James A. Hinton, MPI for Nuclear Physics, Max Planck Society;

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1712.03220.pdf
(Preprint), 492KB

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Citation

LHCb collaboration, Aaij, R., Adeva, B., Adinolfi, M., Ajaltouni, Z., Akar, S., et al. (2018). Updated determination of D0 –¯D0 mixing and CP violation parameters with D0→K+ π- decays. Physical Review D, 97: 031101. doi:10.1103/PhysRevD.97.031101.


Cite as: https://hdl.handle.net/21.11116/0000-0005-7AA2-B
Abstract
We report measurements of charm-mixing parameters based on the
decay-time-dependent ratio of $D^0\to K^+\pi^-$ to $D^0\to K^-\pi^+$ rates. The
analysis uses a data sample of proton-proton collisions corresponding to an
integrated luminosity of $5.0$ fb$^{-1}$ recorded by the LHCb experiment from
2011 through 2016. Assuming charge-parity (CP) symmetry, the mixing parameters
are determined to be $x'^2=(3.9 \pm 2.7) \times10^{-5}$, $y'=(5.28 \pm 0.52)
\times 10^{-3}$, and $R_D=(3.454 \pm 0.031)\times10^{-3}$. Without this
assumption, the measurement is performed separately for $D^0$ and
$\overline{D}{}^0$ mesons, yielding a direct CP-violating asymmetry $A_D
=(-0.1\pm9.1)\times10^{-3}$, and magnitude of the ratio of mixing parameters
$1.00< |q/p| <1.35$ at the $68.3\%$ confidence level. All results include
statistical and systematic uncertainties and improve significantly upon
previous single-measurement determinations. No evidence for CP violation in
charm mixing is observed.