Updated determination of <i>D</i><SUP>0</SUP>-(<i>D</i>)over-bar<SUP>0</SUP> mixing and <i>CP</i> violation parameters with <i>D</i><SUP>0</SUP> → <i>K</i><SUP>+</SUP> π<SUP>-</SUP> decays



Aaij, R, Adeva, B, Adinolfi, M, Ajaltouni, Z, Akar, S, Albrecht, J, Alessio, F, Alexander, M, Alfonso Albero, A, Ali, S
et al (show 787 more authors) (2018) Updated determination of <i>D</i><SUP>0</SUP>-(<i>D</i>)over-bar<SUP>0</SUP> mixing and <i>CP</i> violation parameters with <i>D</i><SUP>0</SUP> → <i>K</i><SUP>+</SUP> π<SUP>-</SUP> decays. PHYSICAL REVIEW D, 97 (3). 031101-.

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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.

Item Type: Article
Additional Information: All figures and tables, along with any supplementary material and additional information, are available at https://lhcbproject.web.cern.ch/lhcbproject/Publications/LHCbProjectPublic/LHCb-PAPER-2017-046.html
Uncontrolled Keywords: hep-ex, hep-ex
Depositing User: Symplectic Admin
Date Deposited: 23 Apr 2018 07:48
Last Modified: 10 Oct 2023 18:20
DOI: 10.1103/PhysRevD.97.031101
Open Access URL: https://doi.org/10.1103/PhysRevD.97.031101
Related URLs:
URI: https://livrepository.liverpool.ac.uk/id/eprint/3020508