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Measurement of the time-integrated CP asymmetry in D 0 → KS 0 KS 0 decays

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Abstract: A measurement of the time-integrated CP asymmetry in D0 → K0 SK0 S 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 asymmetry for D0 → K0 SK0 S is measured to be A CP (D0 → K0 SK0 S ) = (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 obtain A CP (D0 → K0 SK0 S ) = (2.3 ± 2.8 ± 0.9)%. Keywords: Charm physics, CP violation, Flavor physics, Hadron-Hadron scattering (experiments)

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Journal of High Energy Physics, 2018, vol. 2018, num. 11, p. 1-19

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cc-by (c) The LHCb collaboration (Alfonso Albero, A. et al., 2018

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Articles publicats en revistes (Física Quàntica i Astrofísica)

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Large Hadron Collider (France and Switzerland)

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Measurement of the time-integrated CP asymmetry in D 0 → KS 0 KS 0 decays