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Search for CP violation in the phase space of D0 → π+π−π+π− decays
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LHCb Collaboration (Including: Back, J. J., Blake, Thomas, Costa Sobral, Cayo, Crocombe, Andrew, Gershon, T. J., Kreps, Michal, Latham, Thomas, Loh, David, Mathad, Abhijit , O'Hanlon, Daniel P., Poluektov, Anton, Wallace, Charlotte and Wicht, Jean). (2017) Search for CP violation in the phase space of D0 → π+π−π+π− decays. Physics Letters B, 769 . pp. 345-356. doi:10.1016/j.physletb.2017.03.062
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Official URL: https://doi.org/10.1016/j.physletb.2017.03.062
Abstract
A search for time-integrated CP violation in the Cabibbo-suppressed decay D0→π+π−π+π− 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 s=7TeV 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±0.5)% in the P-even case, and marginally consistent with a p-value of (0.6±0.2)% in the P-odd case, corresponding to a significance for CP non-conservation of 2.7 standard deviations.
| Item Type: | Journal Article | ||||||
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| Divisions: | Faculty of Science > Physics | ||||||
| Journal or Publication Title: | Physics Letters B | ||||||
| Publisher: | Elsevier Science BV | ||||||
| ISSN: | 0370-2693 | ||||||
| Official Date: | 10 June 2017 | ||||||
| Dates: |
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| Volume: | 769 | ||||||
| Page Range: | pp. 345-356 | ||||||
| DOI: | 10.1016/j.physletb.2017.03.062 | ||||||
| Status: | Peer Reviewed | ||||||
| Publication Status: | Published | ||||||
| Access rights to Published version: | Open Access |
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