The emergence of the ΔU = 0 rule in charm physics
Abstract We discuss the implications of the recent discovery of CP violation in two-body SCS D decays by LHCb. We show that the result can be explained within the SM without the need for any large SU(3) breaking effects. It further enables the determination of the imaginary part of the ratio of the...
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SpringerOpen
2019-07-01
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| Series: | Journal of High Energy Physics |
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| Online Access: | http://link.springer.com/article/10.1007/JHEP07(2019)020 |
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doaj-5d5e1886c3a9448aa50290fe1a28903a2020-11-25T03:37:33ZengSpringerOpenJournal of High Energy Physics1029-84792019-07-012019711910.1007/JHEP07(2019)020The emergence of the ΔU = 0 rule in charm physicsYuval Grossman0Stefan Schacht1Department of Physics, LEPP, Cornell UniversityDepartment of Physics, LEPP, Cornell UniversityAbstract We discuss the implications of the recent discovery of CP violation in two-body SCS D decays by LHCb. We show that the result can be explained within the SM without the need for any large SU(3) breaking effects. It further enables the determination of the imaginary part of the ratio of the ΔU = 0 over ΔU = 1 matrix elements in charm decays, which we find to be (0.65 ± 0.12). Within the standard model, the result proves the non-perturbative nature of the penguin contraction of tree operators in charm decays, similar to the known non-perturbative enhancement of ΔI = 1/2 over ΔI = 3/2 matrix elements in kaon decays, that is, the ΔI = 1/2 rule. As a guideline for future measurements, we show how to completely solve the most general parametrization of the D → P + P − system.http://link.springer.com/article/10.1007/JHEP07(2019)020CP violationHeavy Quark Physics |
| collection |
DOAJ |
| language |
English |
| format |
Article |
| sources |
DOAJ |
| author |
Yuval Grossman Stefan Schacht |
| spellingShingle |
Yuval Grossman Stefan Schacht The emergence of the ΔU = 0 rule in charm physics Journal of High Energy Physics CP violation Heavy Quark Physics |
| author_facet |
Yuval Grossman Stefan Schacht |
| author_sort |
Yuval Grossman |
| title |
The emergence of the ΔU = 0 rule in charm physics |
| title_short |
The emergence of the ΔU = 0 rule in charm physics |
| title_full |
The emergence of the ΔU = 0 rule in charm physics |
| title_fullStr |
The emergence of the ΔU = 0 rule in charm physics |
| title_full_unstemmed |
The emergence of the ΔU = 0 rule in charm physics |
| title_sort |
emergence of the δu = 0 rule in charm physics |
| publisher |
SpringerOpen |
| series |
Journal of High Energy Physics |
| issn |
1029-8479 |
| publishDate |
2019-07-01 |
| description |
Abstract We discuss the implications of the recent discovery of CP violation in two-body SCS D decays by LHCb. We show that the result can be explained within the SM without the need for any large SU(3) breaking effects. It further enables the determination of the imaginary part of the ratio of the ΔU = 0 over ΔU = 1 matrix elements in charm decays, which we find to be (0.65 ± 0.12). Within the standard model, the result proves the non-perturbative nature of the penguin contraction of tree operators in charm decays, similar to the known non-perturbative enhancement of ΔI = 1/2 over ΔI = 3/2 matrix elements in kaon decays, that is, the ΔI = 1/2 rule. As a guideline for future measurements, we show how to completely solve the most general parametrization of the D → P + P − system. |
| topic |
CP violation Heavy Quark Physics |
| url |
http://link.springer.com/article/10.1007/JHEP07(2019)020 |
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AT yuvalgrossman theemergenceofthedu0ruleincharmphysics AT stefanschacht theemergenceofthedu0ruleincharmphysics AT yuvalgrossman emergenceofthedu0ruleincharmphysics AT stefanschacht emergenceofthedu0ruleincharmphysics |
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