A measurement of the time-integrated CP asymmetry in D0 → K0S K0S 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*+ → D0 π+ 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 → K0S K0S is measured to be A^CP(D0 → K0S K0S) = (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 → K0S K0S) = (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 → K0S K0S Decays. JOURNAL OF HIGH ENERGY PHYSICS, 2018(11), 0-18 [10.1007/JHEP11(2018)048].

Measurement of the Time-Integrated CP Asymmetry in D0 → K0S K0S Decays

Betti, F.;Capriotti, L.;Carbone, A.;Ferrari, F.;Galli, D.;Patrignani, C.;Perazzini, S.;Pisani, F.;Vagnoni, V.;Zucchelli, S.
2018

Abstract

A measurement of the time-integrated CP asymmetry in D0 → K0S K0S 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*+ → D0 π+ 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 → K0S K0S is measured to be A^CP(D0 → K0S K0S) = (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 → K0S K0S) = (2.3 ± 2.8 ± 0.9)%.
2018
Aaij, R., Adeva, B., Adinolfi, M., Aidala, C., Ajaltouni, Z., Akar, S., et al. (2018). Measurement of the Time-Integrated CP Asymmetry in D0 → K0S K0S Decays. JOURNAL OF HIGH ENERGY PHYSICS, 2018(11), 0-18 [10.1007/JHEP11(2018)048].
Aaij, R.; Adeva, B.; Adinolfi, M.; Aidala, C.A.; Ajaltouni, Z.; Akar, S.; Albicocco, P.; Albrecht, J.; Alessio, F.; Alexander, M.; Alfonso Albero, A.;...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/649715
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