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- Title
Improved measurement of the strong-phase difference δDKπ in quantum-correlated DD¯ decays.
- Authors
Ablikim, M.; Achasov, M. N.; Adlarson, P.; Albrecht, M.; Aliberti, R.; Amoroso, A.; An, M. R.; An, Q.; Bai, X. H.; Bai, Y.; Bakina, O.; Baldini Ferroli, R.; Balossino, I.; Ban, Y.; Batozskaya, V.; Becker, D.; Begzsuren, K.; Berger, N.; Bertani, M.; Bettoni, D.
- Abstract
The decay D → K - π + is studied in a sample of quantum-correlated D D ¯ pairs, based on a data set corresponding to an integrated luminosity of 2.93 fb - 1 collected at the ψ (3770) resonance by the BESIII experiment. The asymmetry between C P -odd and C P -even eigenstate decays into K - π + is determined to be A K π = 0.132 ± 0.011 ± 0.007 , where the first uncertainty is statistical and the second is systematic. This measurement is an update of an earlier study exploiting additional tagging modes, including several decay modes involving a K L 0 meson. The branching fractions of the K L 0 modes are determined as input to the analysis in a manner that is independent of any strong phase uncertainty. Using the predominantly C P -even tag D → π + π - π 0 and the ensemble of C P -odd eigenstate tags, the observable A K π π π π 0 is measured to be 0.130 ± 0.012 ± 0.008 . The two asymmetries are sensitive to r D K π cos δ D K π , where r D K π and δ D K π are the ratio of amplitudes and phase difference, respectively, between the doubly Cabibbo-suppressed and Cabibbo-favoured decays. In addition, events containing D → K - π + tagged by D → K S , L 0 π + π - are studied in bins of phase space of the three-body decays. This analysis has sensitivity to both r D K π cos δ D K π and r D K π sin δ D K π . A fit to A K π , A K π π π π 0 and the phase-space distribution of the D → K S , L 0 π + π - tags yields δ D K π = 187.6 - 9.7 + 8.9 - 6.4 + 5.4 ∘ , where external constraints are applied for r D K π and other relevant parameters. This is the most precise measurement of δ D K π in quantum-correlated D D ¯ decays.
- Publication
European Physical Journal C -- Particles & Fields, 2022, Vol 82, Issue 11, p1
- ISSN
1434-6044
- Publication type
Article
- DOI
10.1140/epjc/s10052-022-10872-2