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CP Violation and Mixing in Multi-body $D$ decays

We present recent LHCb results and future prospects for CP violation and mixing measurements in multi-body charm decays. The complex amplitude structure of multi-body decays provides unique sensitivity to CP violation localised in certain phase space regions. A model-independent search in the phase...

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Autor principal: Harnew, S
Lenguaje:eng
Publicado: 2014
Materias:
Acceso en línea:http://cds.cern.ch/record/1641186
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author Harnew, S
author_facet Harnew, S
author_sort Harnew, S
collection CERN
description We present recent LHCb results and future prospects for CP violation and mixing measurements in multi-body charm decays. The complex amplitude structure of multi-body decays provides unique sensitivity to CP violation localised in certain phase space regions. A model-independent search in the phase space of $D \to \pi^{+}\pi^{-}\pi^{+}\pi^{-}$ and $D \to K^{+}K^{-}\pi^{+}\pi^{-}$ decays showed no evidence for localised CP violation. If one assumes the no CP violation hypothesis, the probability of getting the observed results is $9.1\%$ and $41\%$, respectively. The model-independent determination of gamma from $B\to DK$ requires external input to account for the interference of $D^{0}$ and $\bar{D^{0}}$ amplitudes to the same final state. Previously this input could only be obtained at the charm threshold, but recently it has been proposed that $D$ mixing can provide complimentary information. For the example of $D \to K^{+}\pi^{-}\pi^{+}\pi^{-}$ decays, it is shown that charm mixing can be used to considerably improve current constraints on the coherence factor and average strong phase difference, with existing data.
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spelling cern-16411862019-09-30T06:29:59Zhttp://cds.cern.ch/record/1641186engHarnew, SCP Violation and Mixing in Multi-body $D$ decaysParticle Physics - ExperimentWe present recent LHCb results and future prospects for CP violation and mixing measurements in multi-body charm decays. The complex amplitude structure of multi-body decays provides unique sensitivity to CP violation localised in certain phase space regions. A model-independent search in the phase space of $D \to \pi^{+}\pi^{-}\pi^{+}\pi^{-}$ and $D \to K^{+}K^{-}\pi^{+}\pi^{-}$ decays showed no evidence for localised CP violation. If one assumes the no CP violation hypothesis, the probability of getting the observed results is $9.1\%$ and $41\%$, respectively. The model-independent determination of gamma from $B\to DK$ requires external input to account for the interference of $D^{0}$ and $\bar{D^{0}}$ amplitudes to the same final state. Previously this input could only be obtained at the charm threshold, but recently it has been proposed that $D$ mixing can provide complimentary information. For the example of $D \to K^{+}\pi^{-}\pi^{+}\pi^{-}$ decays, it is shown that charm mixing can be used to considerably improve current constraints on the coherence factor and average strong phase difference, with existing data.LHCb-PROC-2014-002CERN-LHCb-PROC-2014-002oai:cds.cern.ch:16411862014-01-07
spellingShingle Particle Physics - Experiment
Harnew, S
CP Violation and Mixing in Multi-body $D$ decays
title CP Violation and Mixing in Multi-body $D$ decays
title_full CP Violation and Mixing in Multi-body $D$ decays
title_fullStr CP Violation and Mixing in Multi-body $D$ decays
title_full_unstemmed CP Violation and Mixing in Multi-body $D$ decays
title_short CP Violation and Mixing in Multi-body $D$ decays
title_sort cp violation and mixing in multi-body $d$ decays
topic Particle Physics - Experiment
url http://cds.cern.ch/record/1641186
work_keys_str_mv AT harnews cpviolationandmixinginmultibodyddecays