Lessons from the LHCb measurement of CP violation in B s → K + K −
Abstract The LHCb experiment measured the time-dependent CP asymmetries C KK and S KK in B s → K + K − decay. Combining with the corresponding CP asymmetries C ππ and S ππ in B → π + π − decay, we find that the size of U-spin breaking in this system is of order 20%. Moreover, the data suggest that t...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
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SpringerOpen
2022-07-01
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| Series: | Journal of High Energy Physics |
| Subjects: | |
| Online Access: | https://doi.org/10.1007/JHEP07(2022)068 |
| _version_ | 1818198286270464000 |
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| author | Yosef Nir Inbar Savoray Yehonatan Viernik |
| author_facet | Yosef Nir Inbar Savoray Yehonatan Viernik |
| author_sort | Yosef Nir |
| collection | DOAJ |
| description | Abstract The LHCb experiment measured the time-dependent CP asymmetries C KK and S KK in B s → K + K − decay. Combining with the corresponding CP asymmetries C ππ and S ππ in B → π + π − decay, we find that the size of U-spin breaking in this system is of order 20%. Moreover, the data suggest that these effects are dominated by factorizable contributions. We further study the constraints on new physics contributions to b → u u ¯ q $$ u\overline{u}q $$ (q = s, d). New physics that is minimally flavor violating (MFV) cannot be distinguished from the Standard Model (SM) in these decays. However, new physics that is not MFV can mimic large U-spin breaking. Requiring that the U-spin breaking parameters remain below the size implied by the data leads to a lower bound of 5 − 10 TeV on the scale of generic new physics. If the new physics is subject to the selection rules that follow from the Froggatt-Nielsen (FN) mechanism or from General Minimal Flavor Violation (GMFV), the bound is relaxed to 2 TeV. |
| first_indexed | 2024-12-12T02:03:27Z |
| format | Article |
| id | doaj.art-ee503ecb68834c468cbaac21fbb757f7 |
| institution | Directory Open Access Journal |
| issn | 1029-8479 |
| language | English |
| last_indexed | 2024-12-12T02:03:27Z |
| publishDate | 2022-07-01 |
| publisher | SpringerOpen |
| record_format | Article |
| series | Journal of High Energy Physics |
| spelling | doaj.art-ee503ecb68834c468cbaac21fbb757f72022-12-22T00:42:07ZengSpringerOpenJournal of High Energy Physics1029-84792022-07-012022711910.1007/JHEP07(2022)068Lessons from the LHCb measurement of CP violation in B s → K + K −Yosef Nir0Inbar Savoray1Yehonatan Viernik2Department of Particle Physics and Astrophysics, Weizmann Institute of ScienceDepartment of Particle Physics and Astrophysics, Weizmann Institute of ScienceDepartment of Particle Physics and Astrophysics, Weizmann Institute of ScienceAbstract The LHCb experiment measured the time-dependent CP asymmetries C KK and S KK in B s → K + K − decay. Combining with the corresponding CP asymmetries C ππ and S ππ in B → π + π − decay, we find that the size of U-spin breaking in this system is of order 20%. Moreover, the data suggest that these effects are dominated by factorizable contributions. We further study the constraints on new physics contributions to b → u u ¯ q $$ u\overline{u}q $$ (q = s, d). New physics that is minimally flavor violating (MFV) cannot be distinguished from the Standard Model (SM) in these decays. However, new physics that is not MFV can mimic large U-spin breaking. Requiring that the U-spin breaking parameters remain below the size implied by the data leads to a lower bound of 5 − 10 TeV on the scale of generic new physics. If the new physics is subject to the selection rules that follow from the Froggatt-Nielsen (FN) mechanism or from General Minimal Flavor Violation (GMFV), the bound is relaxed to 2 TeV.https://doi.org/10.1007/JHEP07(2022)068CP ViolationFlavour SymmetriesOther Weak Scale BSM ModelsSMEFT |
| spellingShingle | Yosef Nir Inbar Savoray Yehonatan Viernik Lessons from the LHCb measurement of CP violation in B s → K + K − Journal of High Energy Physics CP Violation Flavour Symmetries Other Weak Scale BSM Models SMEFT |
| title | Lessons from the LHCb measurement of CP violation in B s → K + K − |
| title_full | Lessons from the LHCb measurement of CP violation in B s → K + K − |
| title_fullStr | Lessons from the LHCb measurement of CP violation in B s → K + K − |
| title_full_unstemmed | Lessons from the LHCb measurement of CP violation in B s → K + K − |
| title_short | Lessons from the LHCb measurement of CP violation in B s → K + K − |
| title_sort | lessons from the lhcb measurement of cp violation in b s k k |
| topic | CP Violation Flavour Symmetries Other Weak Scale BSM Models SMEFT |
| url | https://doi.org/10.1007/JHEP07(2022)068 |
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