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Measurement of CP asymmetry in D0→K−K+ decays
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1-s2.0-S0370269317300795-main.pdf
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750.62 KB
Format
Adobe PDF
Checksum (MD5)
c78956c947208929da899d0ea68c18f0
Date Issued
2017
Journal
Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Publisher
Elsevier BV
Citation
Aaij, R., et al. "Measurement of Cp Asymmetry in D-0 -> K- K+ Decays." Physics Letters B 767 (2017): 177-87.
Version
Final published version
Abstract
© 2017 The Author 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 3 fb−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.
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Creative Commons Attribution 4.0 International License
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DOI of Published Version
http://dx.doi.org/10.1016/J.PHYSLETB.2017.01.061
