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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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Lenguaje: | eng |
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2014
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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. |
id | cern-1641186 |
institution | Organización Europea para la Investigación Nuclear |
language | eng |
publishDate | 2014 |
record_format | invenio |
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 |