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 asymmetry for D0 → KS0KS0 is measured to be ACP(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 obtain ACP(D0→KS0KS0) = (2.3 ± 2.8 ± 0.9)%.

Aaij, R., Adeva, B., Adinolfi, M., Aidala, C., Ajaltouni, Z., Akar, S., et al. (2018). Measurement of the time-integrated CP asymmetry in D0 → KS0 KS0 decays. JOURNAL OF HIGH ENERGY PHYSICS, 2018(11) [10.1007/JHEP11(2018)048].

Measurement of the time-integrated CP asymmetry in D0 → KS0 KS0 decays

Belloli, N.;Borsato, M.;Calvi, M.;Carniti, P.;Cassina, L.;Fazzini, D.;Gotti, C.;Martinelli, M.;Matteuzzi, C.;Petruzzo, M.;
2018

Abstract

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 asymmetry for D0 → KS0KS0 is measured to be ACP(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 obtain ACP(D0→KS0KS0) = (2.3 ± 2.8 ± 0.9)%.
Articolo in rivista - Articolo scientifico
Charm physics; CP violation; Flavor physics; Hadron-Hadron scattering (experiments); Nuclear and High Energy Physics
English
2018
2018
11
48
open
Aaij, R., Adeva, B., Adinolfi, M., Aidala, C., Ajaltouni, Z., Akar, S., et al. (2018). Measurement of the time-integrated CP asymmetry in D0 → KS0 KS0 decays. JOURNAL OF HIGH ENERGY PHYSICS, 2018(11) [10.1007/JHEP11(2018)048].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/215045
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