Model-independent search for CP   violation in D0→KK+ππ+D0→K−K+π−π+ and D0→ππ+π+πD0→π−π+π+π− decays

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Rademacker, Jonas ; Coombes, Matthew P (2013)
  • Publisher: Elsevier Science BV
  • Journal: volume B726, issue 3,702,693, pages 623-633 (issn: 03702693)
  • Related identifiers: doi: 10.1016/j.physletb.2013.09.011
  • Subject: QC | Particle Physics - Experiment | High Energy Physics - Experiment | Physics Institute | 530 Physics | info:eu-repo/classification/acm/TheoryofComputation_ANALYSISOFALGORITHMSANDPROBLEMCOMPLEXITY

A search for $CP$ violation in the phase-space structures of $D^{0}$ and $\bar{D^{0}}$ 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 1.0 fb$^{−1}$ collected in 2011 by the LHCb experiment in $pp$ collisions at a centre-of-mass energy of 7 TeV. 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. A search for $CP$ violation in the phase-space structures of $D^{0}$ and $\bar{D^{0}}$ 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 1.0 fb$^{−1}$ collected in 2011 by the LHCb experiment in $pp$ collisions at a centre-of-mass energy of 7 TeV. 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. A search for CP violation in the phase-space structures of D0 and D¯0 decays to the final states K−K+π−π+ and π−π+π+π− is presented. The search is carried out with a data set corresponding to an integrated luminosity of 1.0 fb−1 collected in 2011 by the LHCb experiment in pp collisions at a centre-of-mass energy of 7 TeV . For the 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− 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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