# Measurement of CP asymmetries in $D^{±} → η′π^{±}$ and $D^{±}_{s} → η′π^{±}$ decays

Bernet, R; Müller, K; Serra, N; Steinkamp, O; Straumann, U; Vollhardt, A; et al (2017). Measurement of CP asymmetries in $D^{±} → η′π^{±}$ and $D^{±}_{s} → η′π^{±}$ decays. Physics Letters B, 771:21-30.

## Abstract

A search for CP violation in $D^{±} → η′π^{±}$ and $D^{±}_{s} → η′π^{±}$ decays is performed using proton–proton collision data, corresponding to an integrated luminosity of 3 $fb^{−1}$, recorded by the LHCb experiment at centre-of-mass energies of 7 and 8 TeV. The measured CP-violating charge asymmetries are
$ACP(D^{±}→η'π±) = −0.61±0.72±0.53±0.12)%$ and
$ACP(D^{±}_{s}→η'π±) = (−0.82±0.36±0.22±0.27)%$, where the first uncertainties are statistical, the second systematic, and the third are the uncertainties on the
$ACP(D^{±}→K^{0}_{S}π±)$ and $ACP(D^{±}_{s}→ϕπ^{±})$ measurements used for calibration. The results represent the most precise measurements of these asymmetries to date.

## Abstract

A search for CP violation in $D^{±} → η′π^{±}$ and $D^{±}_{s} → η′π^{±}$ decays is performed using proton–proton collision data, corresponding to an integrated luminosity of 3 $fb^{−1}$, recorded by the LHCb experiment at centre-of-mass energies of 7 and 8 TeV. The measured CP-violating charge asymmetries are
$ACP(D^{±}→η'π±) = −0.61±0.72±0.53±0.12)%$ and
$ACP(D^{±}_{s}→η'π±) = (−0.82±0.36±0.22±0.27)%$, where the first uncertainties are statistical, the second systematic, and the third are the uncertainties on the
$ACP(D^{±}→K^{0}_{S}π±)$ and $ACP(D^{±}_{s}→ϕπ^{±})$ measurements used for calibration. The results represent the most precise measurements of these asymmetries to date.

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Item Type: Journal Article, refereed, original work 07 Faculty of Science > Physics Institute 530 Physics English May 2017 14 Dec 2017 14:40 24 Dec 2017 06:10 Elsevier 0370-2693 Publisher DOI. An embargo period may apply. https://doi.org/10.1016/j.physletb.2017.05.013

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