# Model-independent search for CP violation in D0 to K-K+pi-pi+ and D0 to pi-pi+pi+pi- decays

LHCb Collaboration; et al; Bernet, R; Müller, K; Steinkamp, O; Straumann, U; Vollhardt, A (2013). Model-independent search for CP violation in D0 to K-K+pi-pi+ and D0 to pi-pi+pi+pi- decays. Physics Letters B, 726(4-5):623-633.

## Abstract

A search for CP violation in the phase-space structures of D0D0 and View the MathML sourceD¯0 decays to the final states K−K+π−π+K−K+π−π+ and π−π+π+π−π−π+π+π− is presented. The search is carried out with a data set corresponding to an integrated luminosity of 1.0 fb−11.0 fb−1 collected in 2011 by the LHCb experiment in pp collisions at a centre-of-mass energy of 7 TeV7 TeV. For the K−K+π−π+K−K+π−π+ final state, the four-body phase space is divided into 32 bins, each bin with approximately 1800 decays. The p-value under the hypothesis of no CP violation is 9.1%, and in no bin is a CP asymmetry greater than 6.5% observed. The phase space of the π−π+π+π−π−π+π+π− final state is partitioned into 128 bins, each bin with approximately 2500 decays. The p-value under the hypothesis of no CP violation is 41%, and in no bin is a CP asymmetry greater than 5.5% observed. All results are consistent with the hypothesis of no CP violation at the current sensitivity.

## Abstract

A search for CP violation in the phase-space structures of D0D0 and View the MathML sourceD¯0 decays to the final states K−K+π−π+K−K+π−π+ and π−π+π+π−π−π+π+π− is presented. The search is carried out with a data set corresponding to an integrated luminosity of 1.0 fb−11.0 fb−1 collected in 2011 by the LHCb experiment in pp collisions at a centre-of-mass energy of 7 TeV7 TeV. For the K−K+π−π+K−K+π−π+ final state, the four-body phase space is divided into 32 bins, each bin with approximately 1800 decays. The p-value under the hypothesis of no CP violation is 9.1%, and in no bin is a CP asymmetry greater than 6.5% observed. The phase space of the π−π+π+π−π−π+π+π− final state is partitioned into 128 bins, each bin with approximately 2500 decays. The p-value under the hypothesis of no CP violation is 41%, and in no bin is a CP asymmetry greater than 5.5% observed. All results are consistent with the hypothesis of no CP violation at the current sensitivity.

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