# Search for $CP$ violation in the phase space of $D^0\rightarrow\pi^+\pi^-\pi^+\pi^-$ decays

Abstract : A search for time-integrated $CP$ violation in the Cabibbo-suppressed decay \mbox{$D^0\rightarrow\pi^+\pi^-\pi^+\pi^-$} is performed using an unbinned, model-independent technique known as the energy test. This is the first application of the energy test in four-body decays. The search is performed for $P$-even $CP$ asymmetries and, for the first time, is extended to probe the $P$-odd case. Using proton-proton collision data corresponding to an integrated luminosity of 3.0~fb$^{-1}$ collected by the LHCb detector at centre-of-mass energies of $\sqrt{s}=$7~TeV and 8~TeV, the world's best sensitivity to $CP$ violation in this decay is obtained. The data are found to be consistent with the hypothesis of $CP$ symmetry with a $p$-value of $(4.6\pm0.5)\%$ in the $P$-even case, and marginally consistent with a $p$-value of $(0.6\pm0.2)\%$ in the $P$-odd case, corresponding to a significance for $CP$ non-conservation of 2.7 standard deviations.
Type de document :
Article dans une revue

http://hal.in2p3.fr/in2p3-01415342
Contributeur : Danielle Cristofol <>
Soumis le : mardi 13 décembre 2016 - 08:51:16
Dernière modification le : jeudi 18 janvier 2018 - 01:51:21

### Citation

R. Aaij, B. Adeva, M. Adinolfi, Z. Ajaltouni, S. Akar, et al.. Search for $CP$ violation in the phase space of $D^0\rightarrow\pi^+\pi^-\pi^+\pi^-$ decays. Physics Letters B, Elsevier, 2017, 769, pp. 345-356. 〈http://www.sciencedirect.com/science/article/pii/S0370269317302538?via%3Dihub〉. 〈10.1016/j.physletb.2017.03.062〉. 〈in2p3-01415342〉

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