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Measurement of the $CP$ violating phase $\phi_{s}$ using $B^{0}_{s} \rightarrow J/\psi K^{+}K^{-}$ decays at the LHCb Experiment
The LHCb experiment at the Large Hadron Collider (LHC) at CERN is designed to search for indirect evidence of physics beyond the Standard Model in $CP$ violation and rare decays of beauty and charm hadrons. One of the key measurements is the $CP$ violating phase $\phi_s$, that arises from the inter...
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Lenguaje: | eng |
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2020
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Acceso en línea: | http://cds.cern.ch/record/2734077 |
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author | Zonneveld, Jennifer Brigitta |
author_facet | Zonneveld, Jennifer Brigitta |
author_sort | Zonneveld, Jennifer Brigitta |
collection | CERN |
description | The LHCb experiment at the Large Hadron Collider (LHC) at CERN is designed to search for indirect evidence of physics beyond the Standard Model in $CP$ violation and rare decays of beauty and charm hadrons. One of the key measurements is the $CP$ violating phase $\phi_s$, that arises from the interference between the decay of $B^0_s$ mesons into $CP$ eigenstates directly and via $B^0_s - \bar{B^0_s}$ mixing. In this thesis, the phase $\phi_s$ is measured in the $B^{0}_{s} \rightarrow J/ \psi K^{+}K^{-}$ decay channel using 1.9 fb$^{-1}$ of proton-proton collisions collected by the LHCb experiment in the years 2015 and 2016 at a centre-of-mass energy of $\sqrt{s} = 13$ TeV. The following results is obtained: $\phi_s = -0.080 \pm 0.041 \pm 0.006$ rad. This is the most precise measurements using a single decay channel. Combining this analysis with other decay channels measured at the LHCb experiment that are sensitive to $\phi_s$ yields the most precise measurements to date: $\phi_s = -0.042 \pm 0.025$ rad. |
id | cern-2734077 |
institution | Organización Europea para la Investigación Nuclear |
language | eng |
publishDate | 2020 |
record_format | invenio |
spelling | cern-27340772020-12-10T11:43:03Zhttp://cds.cern.ch/record/2734077engZonneveld, Jennifer BrigittaMeasurement of the $CP$ violating phase $\phi_{s}$ using $B^{0}_{s} \rightarrow J/\psi K^{+}K^{-}$ decays at the LHCb ExperimentParticle Physics - ExperimentThe LHCb experiment at the Large Hadron Collider (LHC) at CERN is designed to search for indirect evidence of physics beyond the Standard Model in $CP$ violation and rare decays of beauty and charm hadrons. One of the key measurements is the $CP$ violating phase $\phi_s$, that arises from the interference between the decay of $B^0_s$ mesons into $CP$ eigenstates directly and via $B^0_s - \bar{B^0_s}$ mixing. In this thesis, the phase $\phi_s$ is measured in the $B^{0}_{s} \rightarrow J/ \psi K^{+}K^{-}$ decay channel using 1.9 fb$^{-1}$ of proton-proton collisions collected by the LHCb experiment in the years 2015 and 2016 at a centre-of-mass energy of $\sqrt{s} = 13$ TeV. The following results is obtained: $\phi_s = -0.080 \pm 0.041 \pm 0.006$ rad. This is the most precise measurements using a single decay channel. Combining this analysis with other decay channels measured at the LHCb experiment that are sensitive to $\phi_s$ yields the most precise measurements to date: $\phi_s = -0.042 \pm 0.025$ rad.CERN-THESIS-2020-125oai:cds.cern.ch:27340772020-09-27T11:36:46Z |
spellingShingle | Particle Physics - Experiment Zonneveld, Jennifer Brigitta Measurement of the $CP$ violating phase $\phi_{s}$ using $B^{0}_{s} \rightarrow J/\psi K^{+}K^{-}$ decays at the LHCb Experiment |
title | Measurement of the $CP$ violating phase $\phi_{s}$ using $B^{0}_{s} \rightarrow J/\psi K^{+}K^{-}$ decays at the LHCb Experiment |
title_full | Measurement of the $CP$ violating phase $\phi_{s}$ using $B^{0}_{s} \rightarrow J/\psi K^{+}K^{-}$ decays at the LHCb Experiment |
title_fullStr | Measurement of the $CP$ violating phase $\phi_{s}$ using $B^{0}_{s} \rightarrow J/\psi K^{+}K^{-}$ decays at the LHCb Experiment |
title_full_unstemmed | Measurement of the $CP$ violating phase $\phi_{s}$ using $B^{0}_{s} \rightarrow J/\psi K^{+}K^{-}$ decays at the LHCb Experiment |
title_short | Measurement of the $CP$ violating phase $\phi_{s}$ using $B^{0}_{s} \rightarrow J/\psi K^{+}K^{-}$ decays at the LHCb Experiment |
title_sort | measurement of the $cp$ violating phase $\phi_{s}$ using $b^{0}_{s} \rightarrow j/\psi k^{+}k^{-}$ decays at the lhcb experiment |
topic | Particle Physics - Experiment |
url | http://cds.cern.ch/record/2734077 |
work_keys_str_mv | AT zonneveldjenniferbrigitta measurementofthecpviolatingphasephisusingb0srightarrowjpsikkdecaysatthelhcbexperiment |