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A search for the B_0(s) to mu mu (gamma) decays at LHCb
Feasibility studies are conducted to test if the B(s) → µµγ branching fraction can be measured using a partial reconstruction technique, using the B(s) → µµ analysis with no optimisation for the radiative counterpart. An improved measurement of the decay B_s → µµ and searches for the decays B → µµ a...
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Lenguaje: | eng |
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University of Liverpool
2022
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Acceso en línea: | http://cds.cern.ch/record/2808355 https://livrepository.liverpool.ac.uk/id/eprint/3146408 |
_version_ | 1780973095409942528 |
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author | Yeomans, Lauren Emma |
author_facet | Yeomans, Lauren Emma |
author_sort | Yeomans, Lauren Emma |
collection | CERN |
description | Feasibility studies are conducted to test if the B(s) → µµγ branching fraction can be measured using a partial reconstruction technique, using the B(s) → µµ analysis with no optimisation for the radiative counterpart. An improved measurement of the decay B_s → µµ and searches for the decays B → µµ and Bs → µµγ are performed at the LHCb experiment using data collected in proton-proton collisions at √s = 7, 8 and 13 TeV, corresponding to integrated luminosities of 1, 2 and 6 fb−1, respectively. The B_s → µµ branching fraction is measured to be Br(B_s → µµ) = 3.09 (+0.46 -0.43) (+0.15 - 0.11) × 10^−9, where the uncertainty includes both statistical and systematic contributions. No significant signal is found for B → µµ and the upper limit of Br(B0 → µµ) < 2.6 × 10^−10 at 95% confidence level is determined. Positive results from the feasibility studies led to the first search for B_s → µ µγ decays using partial reconstruction, and an upper limit of Br(B_s → µµγ) < 2.0 × 10^−9 is set at 95% confidence level, limited to the range m(µµ) > 4.9 GeV/c^2. Additionally, the ratio between the B_s → µµ and B0 → µµ branching fractions is measured to be R(µ+µ−) < 0.095 at 95% confidence level. The results are all in agreement with the Standard Model predictions. |
id | cern-2808355 |
institution | Organización Europea para la Investigación Nuclear |
language | eng |
publishDate | 2022 |
publisher | University of Liverpool |
record_format | invenio |
spelling | cern-28083552022-05-09T21:21:37Zhttp://cds.cern.ch/record/2808355engYeomans, Lauren EmmaA search for the B_0(s) to mu mu (gamma) decays at LHCb Particle Physics - ExperimentFeasibility studies are conducted to test if the B(s) → µµγ branching fraction can be measured using a partial reconstruction technique, using the B(s) → µµ analysis with no optimisation for the radiative counterpart. An improved measurement of the decay B_s → µµ and searches for the decays B → µµ and Bs → µµγ are performed at the LHCb experiment using data collected in proton-proton collisions at √s = 7, 8 and 13 TeV, corresponding to integrated luminosities of 1, 2 and 6 fb−1, respectively. The B_s → µµ branching fraction is measured to be Br(B_s → µµ) = 3.09 (+0.46 -0.43) (+0.15 - 0.11) × 10^−9, where the uncertainty includes both statistical and systematic contributions. No significant signal is found for B → µµ and the upper limit of Br(B0 → µµ) < 2.6 × 10^−10 at 95% confidence level is determined. Positive results from the feasibility studies led to the first search for B_s → µ µγ decays using partial reconstruction, and an upper limit of Br(B_s → µµγ) < 2.0 × 10^−9 is set at 95% confidence level, limited to the range m(µµ) > 4.9 GeV/c^2. Additionally, the ratio between the B_s → µµ and B0 → µµ branching fractions is measured to be R(µ+µ−) < 0.095 at 95% confidence level. The results are all in agreement with the Standard Model predictions.University of LiverpoolCERN-THESIS-2021-32310.17638/03146408https://livrepository.liverpool.ac.uk/id/eprint/3146408oai:cds.cern.ch:28083552022-01-14 |
spellingShingle | Particle Physics - Experiment Yeomans, Lauren Emma A search for the B_0(s) to mu mu (gamma) decays at LHCb |
title | A search for the B_0(s) to mu mu (gamma) decays at LHCb |
title_full | A search for the B_0(s) to mu mu (gamma) decays at LHCb |
title_fullStr | A search for the B_0(s) to mu mu (gamma) decays at LHCb |
title_full_unstemmed | A search for the B_0(s) to mu mu (gamma) decays at LHCb |
title_short | A search for the B_0(s) to mu mu (gamma) decays at LHCb |
title_sort | search for the b_0(s) to mu mu (gamma) decays at lhcb |
topic | Particle Physics - Experiment |
url | http://cds.cern.ch/record/2808355 https://livrepository.liverpool.ac.uk/id/eprint/3146408 |
work_keys_str_mv | AT yeomanslaurenemma asearchfortheb0stomumugammadecaysatlhcb AT yeomanslaurenemma searchfortheb0stomumugammadecaysatlhcb |