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Measurement of the time-integrated CP asymmetry in D <sup>0</sup> → K<inf>S</inf><sup>0</sup> K<inf>S</inf><sup>0</sup> decays

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sword-2021-04-30T12:00:51.original.xml (130 B)
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Date Issued
November 1, 2018
Journal
Journal of High Energy Physics
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Final published version
Abstract
© 2018, The Author(s). A measurement of the time-integrated CP asymmetry in D0 → KS0KS0 decays is reported. The data correspond to an integrated luminosity of about 2 fb−1 collected in 2015–2016 by the LHCb collaboration in pp collisions at a centre-of-mass energy of 13 TeV. The D0 candidate is required to originate from a D*+ → D0π+ decay, allowing the determination of the flavour of the D0 meson using the pion charge. The D0 → K+K− decay, which has a well measured CP asymmetry, is used as a calibration channel. The CP asymmetryfor D0 → KS0KS0 is measured to beACP(D0→KS0KS0)=(4.3±3.4±1.0)%,where the first uncertainty is statistical and the second is systematic. This result is combined with the previous LHCb measurement at lower centre-of-mass energies to obtainACP(D0→KS0KS0)=(2.3±2.8±0.9)%.[Figure not available: see fulltext.].
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DOI of Published Version
10.1007/JHEP11(2018)048
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