A study of CP violation and measurement of the CKM angle γ in B0→ DK∗0 decays
<p>Two measurements of CP observables in B<sup>0</sup> → DK<sup>∗0</sup> decays are presented, where D represents a superposition of D<sup>0</sup> and D<sup>0</sup>-bar states. The measurements use samples of proton-proton collision data collecte...
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| Formáid: | Tráchtas |
| Teanga: | English |
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2020
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| _version_ | 1826295383064576000 |
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| author | Pullen, HL |
| author2 | Wilkinson, G |
| author_facet | Wilkinson, G Pullen, HL |
| author_sort | Pullen, HL |
| collection | OXFORD |
| description | <p>Two measurements of CP observables in B<sup>0</sup> → DK<sup>∗0</sup> decays are presented, where D represents a superposition of D<sup>0</sup> and D<sup>0</sup>-bar states. The measurements use samples of proton-proton collision data collected with the LHCb detector at centre-of-mass energies of 7, 8, and 13 TeV.</p>
<p>The first measurement uses 5 fb<sup>−1</sup> of data with the D meson reconstructed in the two-body final states K<sup>+</sup>π<sup>−</sup>, π<sup>+</sup>K<sup>−</sup>, K<sup>+</sup>K<sup>-</sup>, and π<sup>+</sup>π<sup>−</sup>, and, for the first time, in the four-body final states K<sup>+</sup>π<sup>−</sup>π<sup>+</sup>π<sup>−</sup>, π<sup>+</sup>K<sup>−</sup>π<sup>+</sup>π<sup>-</sup>, and π<sup>+</sup>π<sup>-</sup>π<sup>+</sup>π<sup>−</sup>. First observations of the decays B0 → D(π<sup>+</sup>K−)K∗0 and B0 → D(π<sup>+</sup>π<sup>−</sup>π<sup>+</sup>π−)K∗0 are obtained, and a set of observables comprising yield ratios and asymmetries is studied. The second measurement studies D-meson decays to the three-body final states K<sub>S</sub><sup>0</sup>π+π<sup>−</sup> and K<sub>S</sub><sup>0</sup>K<sup>+</sup>K<sup>−</sup> in a binned Dalitz plot analysis using 9 fb<sup>−1</sup> of data.</p>
<p>The CP observables from both measurements are interpreted together to determine the CP-violating weak phase γ = (77<sup>+8</sup><sub>-9</sub>)◦. This is the world’s most precise determination using only B0-meson decays and is in agreement with the prediction of the Standard Model. The world’s best measurements of the hadronic parameters r_B = 0.258<sup>+0.022</sup><sub>-0.023</sub> and δ<sub>B0</sub> = (200 ± 8)◦ are also presented.</p> |
| first_indexed | 2024-03-07T04:00:09Z |
| format | Thesis |
| id | oxford-uuid:c447f8b0-b0db-4269-9f51-3f7f7ad3b27f |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-07T04:00:09Z |
| publishDate | 2020 |
| record_format | dspace |
| spelling | oxford-uuid:c447f8b0-b0db-4269-9f51-3f7f7ad3b27f2022-03-27T06:22:22ZA study of CP violation and measurement of the CKM angle γ in B0→ DK∗0 decaysThesishttp://purl.org/coar/resource_type/c_db06uuid:c447f8b0-b0db-4269-9f51-3f7f7ad3b27fExperimental particle physicsHigh energy physicsEnglishHyrax Deposit2020Pullen, HLWilkinson, G<p>Two measurements of CP observables in B<sup>0</sup> → DK<sup>∗0</sup> decays are presented, where D represents a superposition of D<sup>0</sup> and D<sup>0</sup>-bar states. The measurements use samples of proton-proton collision data collected with the LHCb detector at centre-of-mass energies of 7, 8, and 13 TeV.</p> <p>The first measurement uses 5 fb<sup>−1</sup> of data with the D meson reconstructed in the two-body final states K<sup>+</sup>π<sup>−</sup>, π<sup>+</sup>K<sup>−</sup>, K<sup>+</sup>K<sup>-</sup>, and π<sup>+</sup>π<sup>−</sup>, and, for the first time, in the four-body final states K<sup>+</sup>π<sup>−</sup>π<sup>+</sup>π<sup>−</sup>, π<sup>+</sup>K<sup>−</sup>π<sup>+</sup>π<sup>-</sup>, and π<sup>+</sup>π<sup>-</sup>π<sup>+</sup>π<sup>−</sup>. First observations of the decays B0 → D(π<sup>+</sup>K−)K∗0 and B0 → D(π<sup>+</sup>π<sup>−</sup>π<sup>+</sup>π−)K∗0 are obtained, and a set of observables comprising yield ratios and asymmetries is studied. The second measurement studies D-meson decays to the three-body final states K<sub>S</sub><sup>0</sup>π+π<sup>−</sup> and K<sub>S</sub><sup>0</sup>K<sup>+</sup>K<sup>−</sup> in a binned Dalitz plot analysis using 9 fb<sup>−1</sup> of data.</p> <p>The CP observables from both measurements are interpreted together to determine the CP-violating weak phase γ = (77<sup>+8</sup><sub>-9</sub>)◦. This is the world’s most precise determination using only B0-meson decays and is in agreement with the prediction of the Standard Model. The world’s best measurements of the hadronic parameters r_B = 0.258<sup>+0.022</sup><sub>-0.023</sub> and δ<sub>B0</sub> = (200 ± 8)◦ are also presented.</p> |
| spellingShingle | Experimental particle physics High energy physics Pullen, HL A study of CP violation and measurement of the CKM angle γ in B0→ DK∗0 decays |
| title | A study of CP violation and measurement of the CKM angle γ in B0→ DK∗0 decays |
| title_full | A study of CP violation and measurement of the CKM angle γ in B0→ DK∗0 decays |
| title_fullStr | A study of CP violation and measurement of the CKM angle γ in B0→ DK∗0 decays |
| title_full_unstemmed | A study of CP violation and measurement of the CKM angle γ in B0→ DK∗0 decays |
| title_short | A study of CP violation and measurement of the CKM angle γ in B0→ DK∗0 decays |
| title_sort | study of cp violation and measurement of the ckm angle γ in b0 dk∗0 decays |
| topic | Experimental particle physics High energy physics |
| work_keys_str_mv | AT pullenhl astudyofcpviolationandmeasurementoftheckmangleginb0dk0decays AT pullenhl studyofcpviolationandmeasurementoftheckmangleginb0dk0decays |