Search for <i>CP</i> violation in the phase space of D<SUP>0</SUP> → π<SUP>+</SUP>π<SUP>-</SUP>π<SUP>+</SUP>π<SUP>-</SUP> decays



Aaij, R, Adeva, B, Adinolfi, M, Ajaltouni, Z, Akar, S, Albrecht, J, Alessio, F, Alexander, M, Ali, S, Alkhazov, G
et al (show 763 more authors) (2017) Search for <i>CP</i> violation in the phase space of D<SUP>0</SUP> → π<SUP>+</SUP>π<SUP>-</SUP>π<SUP>+</SUP>π<SUP>-</SUP> decays. PHYSICS LETTERS B, 769. pp. 345-356.

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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.

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-2016-044.html
Uncontrolled Keywords: hep-ex, hep-ex
Depositing User: Symplectic Admin
Date Deposited: 04 May 2017 11:46
Last Modified: 17 Oct 2023 22:32
DOI: 10.1016/j.physletb.2017.03.062
Related URLs:
URI: https://livrepository.liverpool.ac.uk/id/eprint/3007243