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Model-independent search for CP violation in D0→K−K+π−π+ and D0→π−π+π+π− decays
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LHCb Collaboration (Including: Back, J. J., Craik, Daniel, Dossett, D., Gershon, T. J., Kreps, Michal, Latham, Thomas, Pilar, T., Poluektov, Anton, Reid, Matthew M., Silva Coutinho, R., Wallace, Charlotte, Whitehead, M. (Mark) and Williams, M. P.). (2013) Model-independent search for CP violation in D0→K−K+π−π+ and D0→π−π+π+π− decays. Physics Letters B, 726 (4–5). pp. 623-633. doi:10.1016/j.physletb.2013.09.011 ISSN 0370-2693.
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WRAP_LHCb_1-s2.0-S0370269313007284-main.pdf - Published Version Available under License Creative Commons Attribution. Download (904Kb) | Preview |
Official URL: http://dx.doi.org/10.1016/j.physletb.2013.09.011
Abstract
A search for CP violation in the phase-space structures of D0 and View the MathML source decays to the final states K−K+π−π+ and π−π+π+π− is presented. The search is carried out with a data set corresponding to an integrated luminosity of 1.0 fb−1 collected in 2011 by the LHCb experiment in pp collisions at a centre-of-mass energy of 7 TeV. For the K−K+π−π+ final state, the four-body phase space is divided into 32 bins, each bin with approximately 1800 decays. The p-value under the hypothesis of no CP violation is 9.1%, and in no bin is a CP asymmetry greater than 6.5% observed. The phase space of the π−π+π+π− final state is partitioned into 128 bins, each bin with approximately 2500 decays. The p-value under the hypothesis of no CP violation is 41%, and in no bin is a CP asymmetry greater than 5.5% observed. All results are consistent with the hypothesis of no CP violation at the current sensitivity.
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