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

Abstract : A search for CP violation in the phase-space structures of D0 and D0bar decays to the final states K-K+pi-pi+ and pi-pi+pi+pi- is presented. The search is carried out with a data set corresponding to an integrated luminosity of 1.0fb^-1 collected in 2011 by the LHCb experiment in $pp$ collisions at a centre-of-mass energy of 7TeV. For the K-K+pi-pi+ 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 pi-pi+pi+pi- 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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http://hal.in2p3.fr/in2p3-00851881
Contributor : Sabine Starita <>
Submitted on : Monday, August 19, 2013 - 10:02:36 AM
Last modification on : Wednesday, September 16, 2020 - 4:23:21 PM

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R. Aaij, Y. Amhis, S. Barsuk, O. Callot, J. He, et al.. Model-independent search for CP violation in D0 to K-K+pi-pi+ and D0 to pi-pi+pi+pi- decays. Physics Letters B, Elsevier, 2013, 726, pp.623-633. ⟨10.1016/j.physletb.2013.09.011⟩. ⟨in2p3-00851881⟩

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