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Prospects for |V$_{ub}$| measurements at LHCb

Precise measurements of the quark coupling strength, $|V_{ub}|$, the least well known CKM element, allow a strong test of the unitarity of the CKM matrix. Previous measurements using exclusive and inclusive methods have resulted in values of $|V_{ub}|$ which are 3$\sigma$ apart. The first measuremen...

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Autor principal: Stefkova, Slavomira
Lenguaje:eng
Publicado: 2016
Acceso en línea:http://cds.cern.ch/record/2142284
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author Stefkova, Slavomira
author_facet Stefkova, Slavomira
author_sort Stefkova, Slavomira
collection CERN
description Precise measurements of the quark coupling strength, $|V_{ub}|$, the least well known CKM element, allow a strong test of the unitarity of the CKM matrix. Previous measurements using exclusive and inclusive methods have resulted in values of $|V_{ub}|$ which are 3$\sigma$ apart. The first measurement of $|V_{ub}|$ at LHCb confirmed this tension using the $\Lambda^{0}_{b} \rightarrow p \mu^{-} \overline{\nu}$ decay. This strengthens the motivation to measure this quantity using different channels, one of them being purely leptonic decay $B^{+} \rightarrow \mu^{+} \mu^{-} \mu^{+} \nu$, which benefits from LHCb's very good muon identification ability. This mode had never been observed before. With recent lattice QCD calculations, LHCb can also constrain $|V_{ub}|$ using the $B^{0}_s \rightarrow K^{+} \mu^{-} \overline{\nu}$ decay where the theoretical uncertainty is significantly smaller.
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institution Organización Europea para la Investigación Nuclear
language eng
publishDate 2016
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spelling cern-21422842019-09-30T06:29:59Zhttp://cds.cern.ch/record/2142284engStefkova, SlavomiraProspects for |V$_{ub}$| measurements at LHCb Precise measurements of the quark coupling strength, $|V_{ub}|$, the least well known CKM element, allow a strong test of the unitarity of the CKM matrix. Previous measurements using exclusive and inclusive methods have resulted in values of $|V_{ub}|$ which are 3$\sigma$ apart. The first measurement of $|V_{ub}|$ at LHCb confirmed this tension using the $\Lambda^{0}_{b} \rightarrow p \mu^{-} \overline{\nu}$ decay. This strengthens the motivation to measure this quantity using different channels, one of them being purely leptonic decay $B^{+} \rightarrow \mu^{+} \mu^{-} \mu^{+} \nu$, which benefits from LHCb's very good muon identification ability. This mode had never been observed before. With recent lattice QCD calculations, LHCb can also constrain $|V_{ub}|$ using the $B^{0}_s \rightarrow K^{+} \mu^{-} \overline{\nu}$ decay where the theoretical uncertainty is significantly smaller. Poster-2016-530oai:cds.cern.ch:21422842016-03-02
spellingShingle Stefkova, Slavomira
Prospects for |V$_{ub}$| measurements at LHCb
title Prospects for |V$_{ub}$| measurements at LHCb
title_full Prospects for |V$_{ub}$| measurements at LHCb
title_fullStr Prospects for |V$_{ub}$| measurements at LHCb
title_full_unstemmed Prospects for |V$_{ub}$| measurements at LHCb
title_short Prospects for |V$_{ub}$| measurements at LHCb
title_sort prospects for |v$_{ub}$| measurements at lhcb
url http://cds.cern.ch/record/2142284
work_keys_str_mv AT stefkovaslavomira prospectsforvubmeasurementsatlhcb