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Search for CP violation in D s + → h + π 0 and D s + → h + η decays

Published version
Peer-reviewed

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Authors

Aaij, R. 
Abellán Beteta, C. 
Ackernley, T. 
Adeva, B. 
Adinolfi, M. 

Abstract

Abstract: Searches for CP violation in the two-body decays Ds+→h+π0 and Ds+→h+η (where h+ denotes a π+ or K+ meson) are performed using pp collision data collected by the LHCb experiment corresponding to either 9 fb−1 or 6 fb−1 of integrated luminosity. The π0 and η mesons are reconstructed using the e+e−γ final state, which can proceed as three-body decays π0→ e+e−γ and η → e+e−γ, or via the two-body decays π0→ γγ and η → γγ followed by a photon conversion. The measurements are made relative to the control modes Ds+→KS0h+ to cancel the production and detection asymmetries. The CP asymmetries are measured to beACPD+→π+π0=−1.3±0.9±0.6%, ACPD+→K+π0=−3.2±4.7±2.1%, ACPD+→π+η=−0.2±0.8±0.4%, ACPD+→K+η=−6±10±4%, ACPDs+→K+π0=−0.8±3.9±1.2%, ACPDs+→π+η=0.8±0.7±0.5%, ACPDs+→K+η=0.9±3.7±1.1%, where the first uncertainties are statistical and the second systematic. These results are consistent with no CP violation and mostly constitute the most precise measurements of ACP in these decay modes to date.

Description

Keywords

Regular Article - Experimental Physics, Charm physics, CP violation, Hadron-Hadron scattering (experiments)

Journal Title

Journal of High Energy Physics

Conference Name

Journal ISSN

1029-8479

Volume Title

2021

Publisher

Springer Berlin Heidelberg