Measurement of the time-integrated CP asymmetry in D⁰ → K[subscript S]⁰ K[subscript S]⁰ decays
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Author(s)
Aaij, R.
Adeva, B.
Adinolfi, M.
Aidala, C. A
Ajaltouni, Z.
Akar, S.
Albicocco, P.
Albrecht, J.
Alessio, F.
Alexander, M.
Date Issued
November 2018
Journal
Journal of High Energy Physics
Publisher
Springer Berlin Heidelberg
Citation
Aaij, R. et al. "Measurement of the time-integrated CP asymmetry in D⁰ → K[subscript S]⁰ K[subscript S]⁰ decays." Journal of High Energy Physics 2018 (November 2018): 48 © 2018 The Author(s)
Version
Final published version
Abstract
A measurement of the time-integrated CP asymmetry in D⁰ → K[subscript S]⁰ K[subscript S]⁰ 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 → K[subscript S]⁰ K[subscript S]⁰ is measured to be A[superscript CP] D⁰ → K[subscript S]⁰ K[subscript S]⁰ = 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[superscript CP] D⁰ → K[subscript S]⁰ K[subscript S]⁰ = (2.3 ± 2.8 ± 0.9) %. Keywords: Charm physics; CP violation; Flavor physics; Hadron-Hadron scattering (experiments)
MIT Department
Massachusetts Institute of Technology. Department of Physics
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DOI of Published Version
https://doi.org/10.1007/JHEP11(2018)048
