Measurement of <i>CP</i> asymmetry in <i>D</i><SUP>0</SUP> → <i>K</i><SUP>-</SUP> <i>K</i><SUP>+</SUP> decays



Aaij, R, Adeva, B, Adinolfi, M, Ajaltouni, Z, Akar, S, Albrechtl, J, Alessio, F, Alexander, M, Ali, S, Alkhazov, G
et al (show 757 more authors) (2017) Measurement of <i>CP</i> asymmetry in <i>D</i><SUP>0</SUP> → <i>K</i><SUP>-</SUP> <i>K</i><SUP>+</SUP> decays. PHYSICS LETTERS B, 767. pp. 177-187.

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Abstract

A measurement of the time-integrated $CP$ asymmetry in the Cabibbo-suppressed decay $D^0\rightarrow K^-K^+$ is performed using pp collision data, corresponding to an integrated luminosity of 3fb$^{-1}$, collected with the LHCb detector at centre-of-mass energies of 7 and 8 TeV. The flavour of the charm meson at production is determined from the charge of the pion in $D^{*+}\rightarrow D^0 \pi^+$ and $D^{*-}\rightarrow \bar{D^0} \pi^-$ decays. The time-integrated $CP$ asymmetry $A_{CP}(K^-K^+)$ is obtained assuming negligible $CP$ violation in charm mixing and in Cabibbo-favoured $D^0\rightarrow K^-\pi^+$, $D^+\rightarrow K^-\pi^+\pi^+$ and $D^+\rightarrow \bar{K^0}\pi^+$ decays used as calibration channels. It is found to be $A_{CP}(K^-K^+)=(0.14\pm0.15(stat)\pm0.10(syst))\%$. A combination of this result with previous LHCb measurements yields $A_{CP}(K^-K^+)=(0.04\pm0.12(stat)\pm0.10(syst))\%$, $A_{CP}(\pi^-\pi^+)=(0.07\pm0.14(stat)\pm0.11(syst))\%$. These are the most precise measurements from a single experiment. The result for $A_{CP}(K^-K^+)$ is the most precise determination of a time-integrated $CP$ asymmetry in the charm sector to date, and neither measurement shows evidence of CP asymmetry.

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-2016-035.html
Uncontrolled Keywords: hep-ex, hep-ex
Depositing User: Symplectic Admin
Date Deposited: 24 Feb 2017 13:47
Last Modified: 18 Oct 2023 15:45
DOI: 10.1016/j.physletb.2017.01.061
Related URLs:
URI: https://livrepository.liverpool.ac.uk/id/eprint/3006049