Measurement of matter–antimatter differences in beauty baryon decays
Differences in the behaviour of matter and antimatter have been observed in K and B meson decays, but not yet in any baryon decay. Such differences are associated with the non-invariance of fundamental interactions under the combined charge-conjugation and parity transformations, known as CP violati...
| Main Authors: | , , , , , , , , , , , , , , , , , |
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| Format: | Journal article |
| Published: |
Nature Publishing Group
2017
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| _version_ | 1826267149091471360 |
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| author | Aaij, R Adeva, B Adinolfi, M Evans, T Gandini, P Gruberg Cazon, B Hadavizadeh, T Harnew, N Hill, D Jalocha, P John, M Jurik, N Malde, S Nandi, A Rollings, A Topp-Joergensen, S Wilkinson, G LHCb Collaboration |
| author_facet | Aaij, R Adeva, B Adinolfi, M Evans, T Gandini, P Gruberg Cazon, B Hadavizadeh, T Harnew, N Hill, D Jalocha, P John, M Jurik, N Malde, S Nandi, A Rollings, A Topp-Joergensen, S Wilkinson, G LHCb Collaboration |
| author_sort | Aaij, R |
| collection | OXFORD |
| description | Differences in the behaviour of matter and antimatter have been observed in K and B meson decays, but not yet in any baryon decay. Such differences are associated with the non-invariance of fundamental interactions under the combined charge-conjugation and parity transformations, known as CP violation. Here, using data from the LHCb experiment at the Large Hadron Collider, we search for CP-violating asymmetries in the decay angle distributions of Λ b 0 baryons decaying to pπ - π + π - and pπ - K + K - final states. These four-body hadronic decays are a promising place to search for sources of CP violation both within and beyond the standard model of particle physics. We find evidence for CP violation in Λ b 0 to pπ - π + π - decays with a statistical significance corresponding to 3.3 standard deviations including systematic uncertainties. This represents the first evidence for CP violation in the baryon sector. |
| first_indexed | 2024-03-06T20:49:47Z |
| format | Journal article |
| id | oxford-uuid:372b7022-fdae-49ed-b86f-a582996e71dc |
| institution | University of Oxford |
| last_indexed | 2024-03-06T20:49:47Z |
| publishDate | 2017 |
| publisher | Nature Publishing Group |
| record_format | dspace |
| spelling | oxford-uuid:372b7022-fdae-49ed-b86f-a582996e71dc2022-03-26T13:42:34ZMeasurement of matter–antimatter differences in beauty baryon decaysJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:372b7022-fdae-49ed-b86f-a582996e71dcSymplectic Elements at OxfordNature Publishing Group2017Aaij, RAdeva, BAdinolfi, MEvans, TGandini, PGruberg Cazon, BHadavizadeh, THarnew, NHill, DJalocha, PJohn, MJurik, NMalde, SNandi, ARollings, ATopp-Joergensen, SWilkinson, GLHCb CollaborationDifferences in the behaviour of matter and antimatter have been observed in K and B meson decays, but not yet in any baryon decay. Such differences are associated with the non-invariance of fundamental interactions under the combined charge-conjugation and parity transformations, known as CP violation. Here, using data from the LHCb experiment at the Large Hadron Collider, we search for CP-violating asymmetries in the decay angle distributions of Λ b 0 baryons decaying to pπ - π + π - and pπ - K + K - final states. These four-body hadronic decays are a promising place to search for sources of CP violation both within and beyond the standard model of particle physics. We find evidence for CP violation in Λ b 0 to pπ - π + π - decays with a statistical significance corresponding to 3.3 standard deviations including systematic uncertainties. This represents the first evidence for CP violation in the baryon sector. |
| spellingShingle | Aaij, R Adeva, B Adinolfi, M Evans, T Gandini, P Gruberg Cazon, B Hadavizadeh, T Harnew, N Hill, D Jalocha, P John, M Jurik, N Malde, S Nandi, A Rollings, A Topp-Joergensen, S Wilkinson, G LHCb Collaboration Measurement of matter–antimatter differences in beauty baryon decays |
| title | Measurement of matter–antimatter differences in beauty baryon decays |
| title_full | Measurement of matter–antimatter differences in beauty baryon decays |
| title_fullStr | Measurement of matter–antimatter differences in beauty baryon decays |
| title_full_unstemmed | Measurement of matter–antimatter differences in beauty baryon decays |
| title_short | Measurement of matter–antimatter differences in beauty baryon decays |
| title_sort | measurement of matter antimatter differences in beauty baryon decays |
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