Constraints on the CKM angle gamma from B-+/- -> Dh(+/-) decays using D -> h(+/-)h '(-/+)pi(0) final states



Aaij, R, Abdelmotteleb, ASW, Beteta, C Abellan, Gallego, FJ Abudinen, Ackernley, T, Adeva, B, Adinolfi, M, Afsharnia, H, Agapopoulou, C, Aidala, CA
et al (show 1001 more authors) (2022) Constraints on the CKM angle gamma from B-+/- -> Dh(+/-) decays using D -> h(+/-)h '(-/+)pi(0) final states. JOURNAL OF HIGH ENERGY PHYSICS, 2022 (7).

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Abstract

<jats:title>A<jats:sc>bstract</jats:sc> </jats:title><jats:p>A data sample collected with the LHCb detector corresponding to an integrated luminosity of 9 fb<jats:sup><jats:italic>−</jats:italic>1</jats:sup> is used to measure eleven <jats:italic>CP</jats:italic> violation observables in <jats:italic>B</jats:italic><jats:sup><jats:italic>±</jats:italic></jats:sup><jats:italic>→ Dh</jats:italic><jats:sup><jats:italic>±</jats:italic></jats:sup> decays, where <jats:italic>h</jats:italic> is either a kaon or a pion. The neutral <jats:italic>D</jats:italic> meson decay is reconstructed in the three-body final states: <jats:italic>K</jats:italic><jats:sup><jats:italic>±</jats:italic></jats:sup><jats:italic>π</jats:italic><jats:sup>∓</jats:sup><jats:italic>π</jats:italic><jats:sup>0</jats:sup>; <jats:italic>π</jats:italic><jats:sup>+</jats:sup><jats:italic>π</jats:italic><jats:sup><jats:italic>−</jats:italic></jats:sup><jats:italic>π</jats:italic><jats:sup>0</jats:sup>; <jats:italic>K</jats:italic><jats:sup>+</jats:sup><jats:italic>K</jats:italic><jats:sup><jats:italic>−</jats:italic></jats:sup><jats:italic>π</jats:italic><jats:sup>0</jats:sup> and the suppressed <jats:italic>π</jats:italic><jats:sup><jats:italic>±</jats:italic></jats:sup><jats:italic>K</jats:italic><jats:sup>∓</jats:sup><jats:italic>π</jats:italic><jats:sup>0</jats:sup> combination. The mode where a large <jats:italic>CP</jats:italic> asymmetry is expected, <jats:italic>B</jats:italic><jats:sup><jats:italic>±</jats:italic></jats:sup><jats:italic>→</jats:italic> [<jats:italic>π</jats:italic><jats:sup><jats:italic>±</jats:italic></jats:sup><jats:italic>K</jats:italic><jats:sup>∓</jats:sup><jats:italic>π</jats:italic><jats:sup>0</jats:sup>]<jats:sub><jats:italic>D</jats:italic></jats:sub><jats:italic>K</jats:italic><jats:sup><jats:italic>±</jats:italic></jats:sup>, is observed with a significance greater than seven standard deviations. The ratio of the partial width of this mode relative to that of the favoured mode, <jats:italic>B</jats:italic><jats:sup><jats:italic>±</jats:italic></jats:sup><jats:italic>→</jats:italic> [<jats:italic>K</jats:italic><jats:sup><jats:italic>±</jats:italic></jats:sup><jats:italic>π</jats:italic><jats:sup>∓</jats:sup><jats:italic>π</jats:italic><jats:sup>0</jats:sup>]<jats:sub><jats:italic>D</jats:italic></jats:sub><jats:italic>K</jats:italic><jats:sup><jats:italic>±</jats:italic></jats:sup>, is <jats:italic>R</jats:italic><jats:sub>ADS(<jats:italic>K</jats:italic>)</jats:sub> = (1<jats:italic>.</jats:italic>27 <jats:italic>±</jats:italic> 0<jats:italic>.</jats:italic>16 <jats:italic>±</jats:italic> 0<jats:italic>.</jats:italic>02) <jats:italic>×</jats:italic> 10<jats:sup><jats:italic>−</jats:italic>2</jats:sup>. Evidence for a large <jats:italic>CP</jats:italic> asymmetry is also seen: <jats:italic>A</jats:italic><jats:sub>ADS(<jats:italic>K</jats:italic>)</jats:sub> = −0<jats:italic>.</jats:italic>38 <jats:italic>±</jats:italic> 0<jats:italic>.</jats:italic>12 <jats:italic>±</jats:italic> 0<jats:italic>.</jats:italic>02. Constraints on the CKM angle <jats:italic>γ</jats:italic> are calculated from the eleven reported observables.</jats:p>

Item Type: Article
Uncontrolled Keywords: CKM Angle Gamma, CP Violation, B Physics, Hadron-Hadron Scattering
Divisions: Faculty of Science and Engineering > School of Physical Sciences
Depositing User: Symplectic Admin
Date Deposited: 31 Aug 2022 10:22
Last Modified: 18 Jan 2023 20:46
DOI: 10.1007/JHEP07(2022)099
Open Access URL: https://link.springer.com/content/pdf/10.1007/JHEP...
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URI: https://livrepository.liverpool.ac.uk/id/eprint/3162845