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Search for $CP$ violation using $T$-odd correlations in $D^0 \to K^+K^-\pi^+\pi^-$ decays

By R. Aaij, Y. Amhis, S. Barsuk, M. Borsato, O. Kochebina, J. Lefrançois, F. Machefert, A. Martin Sanchez, Marie Nicol, P. Robbe, M.-H. Schune, M. Teklishyn, A. Vallier, B. Viaud, Ziad Ajaltouni, M. Baalouch, E. Cogneras, O. Deschamps, I. El Rifai, M. Grabalosa Gándara, Pierre Henrard, M. Hoballah, R. Lefèvre, J. Maratas, S. Monteil, V. Niess, Pascal Perret, S. Akar, E. Aslanides, J. Cogan, W. Kanso, R. Legac, O. Leroy, G. Mancinelli, A. Mordà, M. Perrin-Terrin, J. Serrano, A. Tsaregorodtsev, L. Beaucourt, M. Chefdeville, D. Decamp, N. Déléage, Ph. Ghez, J.-P. Lees, J.F. Marchand, M.-N. Minard, B. Pietrzyk, W. Qian, S. T'Jampens, V. Tisserand and E. Tournefier

Abstract

23 pages including author list, 5 figures - See paper for full list of authorsA search for $CP$ violation using $T$-odd correlations is performed using the four-body $D^0 \to K^+K^-\pi^+\pi^-$ decay, selected from semileptonic $B$ decays. The data sample corresponds to integrated luminosities of $1.0\,\text{fb}^{-1}$ and $2.0\,\text{fb}^{-1}$ recorded at the centre-of-mass energies of 7 TeV and 8 TeV, respectively. The $CP$-violating asymmetry $a_{CP}^{T\text{-odd}}$ is measured to be $(0.18\pm 0.29\text{(stat)}\pm 0.04\text{(syst)})\%$. Searches for $CP$ violation in different regions of phase space of the four-body decay, and as a function of the $D^0$ decay time, are also presented. No significant deviation from the $CP$ conservation hypothesis is found

Topics: [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex]
Publisher: 'Springer Science and Business Media LLC'
Year: 2014
DOI identifier: 10.1007/JHEP10(2014)005
OAI identifier: oai:HAL:in2p3-01054528v1
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