New extraction of CP violation in b-baryon decays
We study CP violation in b-baryon decays of Ξb−→Ξ−D with D=D0,D¯0 and Di(i=1,2). We find that these baryonic decay processes provide an ideal opportunity to measure the weak phase due to the absence of the relative strong phase. Explicitly, we relate ρ¯ and η¯ the CKM elements with the decay rate ra...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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Elsevier
2022-11-01
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| Series: | Physics Letters B |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S0370269322005639 |
| _version_ | 1811344208198369280 |
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| author | Chao-Qiang Geng Xiang-Nan Jin Chia-Wei Liu Zheng-Yi Wei Jiabao Zhang |
| author_facet | Chao-Qiang Geng Xiang-Nan Jin Chia-Wei Liu Zheng-Yi Wei Jiabao Zhang |
| author_sort | Chao-Qiang Geng |
| collection | DOAJ |
| description | We study CP violation in b-baryon decays of Ξb−→Ξ−D with D=D0,D¯0 and Di(i=1,2). We find that these baryonic decay processes provide an ideal opportunity to measure the weak phase due to the absence of the relative strong phase. Explicitly, we relate ρ¯ and η¯ the CKM elements with the decay rate ratios of Ri=Γ(Ξb−→Ξ−Di)/Γ(Ξb−→Ξ−D0) without the charge conjugate states. As a complementary, we also examine the decay distributions of Λb→Λ(→pπ−)D. There are in total 32 decay observables, which can be parameterized by 9 real parameters, allowing the experiments to extract the angle γ≡arg(−VudVub⁎/VcdVcb⁎) in the CKM unitarity triangle. In addition, the feasibilities of the experimental measurements are discussed. We find that ρ¯ and η¯ can be extracted at LHCb Run3 from Ξb−→Ξ−D, and a full analysis of Λb→Λ(→pπ−)D is available at LHCb Run4. |
| first_indexed | 2024-04-13T19:43:41Z |
| format | Article |
| id | doaj.art-e0b523cb147043bf9423fc9582fda2f5 |
| institution | Directory Open Access Journal |
| issn | 0370-2693 |
| language | English |
| last_indexed | 2024-04-13T19:43:41Z |
| publishDate | 2022-11-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Physics Letters B |
| spelling | doaj.art-e0b523cb147043bf9423fc9582fda2f52022-12-22T02:32:47ZengElsevierPhysics Letters B0370-26932022-11-01834137429New extraction of CP violation in b-baryon decaysChao-Qiang Geng0Xiang-Nan Jin1Chia-Wei Liu2Zheng-Yi Wei3Jiabao Zhang4School of Fundamental Physics and Mathematical Sciences, Hangzhou Institute for Advanced Study, UCAS, Hangzhou 310024, China; University of Chinese Academy of Sciences, 100190 Beijing, ChinaSchool of Fundamental Physics and Mathematical Sciences, Hangzhou Institute for Advanced Study, UCAS, Hangzhou 310024, China; University of Chinese Academy of Sciences, 100190 Beijing, ChinaSchool of Fundamental Physics and Mathematical Sciences, Hangzhou Institute for Advanced Study, UCAS, Hangzhou 310024, China; University of Chinese Academy of Sciences, 100190 Beijing, China; Corresponding author.School of Fundamental Physics and Mathematical Sciences, Hangzhou Institute for Advanced Study, UCAS, Hangzhou 310024, China; University of Chinese Academy of Sciences, 100190 Beijing, ChinaSchool of Fundamental Physics and Mathematical Sciences, Hangzhou Institute for Advanced Study, UCAS, Hangzhou 310024, China; University of Chinese Academy of Sciences, 100190 Beijing, ChinaWe study CP violation in b-baryon decays of Ξb−→Ξ−D with D=D0,D¯0 and Di(i=1,2). We find that these baryonic decay processes provide an ideal opportunity to measure the weak phase due to the absence of the relative strong phase. Explicitly, we relate ρ¯ and η¯ the CKM elements with the decay rate ratios of Ri=Γ(Ξb−→Ξ−Di)/Γ(Ξb−→Ξ−D0) without the charge conjugate states. As a complementary, we also examine the decay distributions of Λb→Λ(→pπ−)D. There are in total 32 decay observables, which can be parameterized by 9 real parameters, allowing the experiments to extract the angle γ≡arg(−VudVub⁎/VcdVcb⁎) in the CKM unitarity triangle. In addition, the feasibilities of the experimental measurements are discussed. We find that ρ¯ and η¯ can be extracted at LHCb Run3 from Ξb−→Ξ−D, and a full analysis of Λb→Λ(→pπ−)D is available at LHCb Run4.http://www.sciencedirect.com/science/article/pii/S0370269322005639 |
| spellingShingle | Chao-Qiang Geng Xiang-Nan Jin Chia-Wei Liu Zheng-Yi Wei Jiabao Zhang New extraction of CP violation in b-baryon decays Physics Letters B |
| title | New extraction of CP violation in b-baryon decays |
| title_full | New extraction of CP violation in b-baryon decays |
| title_fullStr | New extraction of CP violation in b-baryon decays |
| title_full_unstemmed | New extraction of CP violation in b-baryon decays |
| title_short | New extraction of CP violation in b-baryon decays |
| title_sort | new extraction of cp violation in b baryon decays |
| url | http://www.sciencedirect.com/science/article/pii/S0370269322005639 |
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