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Measurement of

C P

Violation Observables in

D^{+} \to K^{-} K^{+} π^{+}

Decays

https://doi.org/10.1103/PhysRevLett.133.251801

Aaij, R; Abdelmotteleb, A_S W; Abellan_Beteta, C; Abudinén, F; Ackernley, T; Adefisoye, A A; Adeva, B; Adinolfi, M; Adlarson, P; Agapopoulou, C; et al (December 2024, Physical Review Letters)

A search for violation of the charge-parity (

C P

) symmetry in the

D^{+} \to K^{-} K^{+} π^{+}

decay is presented, with proton-proton collision data corresponding to an integrated luminosity of

5.4 {fb}^{- 1}

, collected at a center-of-mass energy of 13 TeV with the LHCb detector. A novel model-independent technique is used to compare the

D^{+}

and

D^{-}

phase-space distributions, with instrumental asymmetries subtracted using the

D_{s}^{+} \to K^{-} K^{+} π^{+}

decay as a control channel. The

p

value for the hypothesis of

C P

conservation is 8.1%. The

C P

asymmetry observables

A_{C P | S}^{ϕ π^{+}} = (0.95 \pm 0.4 3_{stat} \pm 0.2 6_{syst}) \times 10^{- 3}

and

A_{C P | S}^{{\bar{K}}^{* 0} K^{+}} = (- 0.26 \pm 0.5 6_{stat} \pm 0.1 8_{syst}) \times 10^{- 3}

are also measured. These results show no evidence of

C P

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