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Measurement of CP asymmetry in D0 → K−K+ 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) Measurement of CP asymmetry in D0 → K−K+ decays. Physics Letters B, 769 . pp. 305-313. doi:10.1016/j.physletb.2017.01.061 ISSN 0370-2693.
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Official URL: https://doi.org/10.1016/j.physletb.2017.01.061
Abstract
A measurement of the time-integrated CP asymmetry in the Cabibbo-suppressed decay D0→K−K+ is performed using pp collision data, corresponding to an integrated luminosity of 3fb−1, collected with the LHCb detector at centre-of-mass energies of 7 and 8 TeV. The flavour of the charm meson at production is determined from the charge of the pion in D⁎+→D0π+ and D⁎−→D‾0π− decays. The time-integrated CP asymmetry ACP(K−K+) is obtained assuming negligible CP violation in charm mixing and in Cabibbo-favoured D0→K−π+, D+→K−π+π+ and D+→K‾0π+ decays used as calibration channels. It is found to be
ACP(K−K+)=(0.14±0.15(stat)±0.10(syst))%.
A combination of this result with previous LHCb measurements yields
ACP(K−K+)=(0.04±0.12(stat)±0.10(syst))%,ACP(π−π+)=(0.07±0.14(stat)±0.11(syst))%.
These are the most precise measurements from a single experiment. The result for ACP(K−K+) is the most precise determination of a time-integrated CP asymmetry in the charm sector to date, and neither measurement shows evidence of CP asymmetry.
| Item Type: | Journal Article | ||||||
|---|---|---|---|---|---|---|---|
| Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||||
| Journal or Publication Title: | Physics Letters B | ||||||
| Publisher: | Elsevier Science BV | ||||||
| ISSN: | 0370-2693 | ||||||
| Official Date: | 10 April 2017 | ||||||
| Dates: |
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| Volume: | 769 | ||||||
| Page Range: | pp. 305-313 | ||||||
| DOI: | 10.1016/j.physletb.2017.01.061 | ||||||
| Status: | Peer Reviewed | ||||||
| Publication Status: | Published | ||||||
| Access rights to Published version: | Open Access (Creative Commons) |
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