Search for CP violation in the phase space of D0→π+π−π+π− decays
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1-s2.0-S0370269317302538-main.pdf
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1.29 MB
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10756375dca0ebf9a647297c86a3ffe3
Author(s)
The LHCb Collaboration
Boettcher, Thomas Julian
Ilten, Philip J
Williams, Michael
Date Issued
2017
Journal
Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Publisher
Elsevier BV
Citation
Aaij, R., et al. "Search for Cp Violation in the Phase Space of D0�?�p+?-?+?- Decays." Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics 769 (2017): 345-56.
Version
Final published version
Abstract
© 2017 The Author(s) 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=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±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.
MIT Department
Massachusetts Institute of Technology. Department of Physics
Massachusetts Institute of Technology. Laboratory for Nuclear Science
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DOI of Published Version
https://doi.org/10.1016/J.PHYSLETB.2017.03.062
