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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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Lenguaje: | eng |
Publicado: |
2016
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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. |
id | cern-2142284 |
institution | Organización Europea para la Investigación Nuclear |
language | eng |
publishDate | 2016 |
record_format | invenio |
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 |