Measurement of CP asymmetries and branching fraction ratios of B− decays to two charm mesons



Aaij, R, Abdelmotteleb, ASW, Abellan Beteta, C, Abudinén, F, Ackernley, T, Adeva, B, Adinolfi, M, Adlarson, P, Afsharnia, H, Agapopoulou, C
et al (show 1060 more authors) (2023) Measurement of CP asymmetries and branching fraction ratios of B− decays to two charm mesons. Journal of High Energy Physics, 2023 (9). 202-.

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Abstract

<jats:title>A<jats:sc>bstract</jats:sc> </jats:title><jats:p>The <jats:italic>CP</jats:italic> asymmetries of seven <jats:italic>B</jats:italic><jats:sup><jats:italic>−</jats:italic></jats:sup> decays to two charm mesons are measured using data corresponding to an integrated luminosity of 9 fb<jats:sup><jats:italic>−</jats:italic>1</jats:sup> of proton-proton collisions collected by the LHCb experiment. Decays involving a <jats:italic>D</jats:italic><jats:sup>*0</jats:sup> or <jats:inline-formula><jats:alternatives><jats:tex-math>$$ {D}_s^{\ast -} $$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msubsup> <mml:mi>D</mml:mi> <mml:mi>s</mml:mi> <mml:mrow> <mml:mo>∗</mml:mo> <mml:mo>−</mml:mo> </mml:mrow> </mml:msubsup> </mml:math></jats:alternatives></jats:inline-formula> meson are analysed by reconstructing only the <jats:italic>D</jats:italic><jats:sup>0</jats:sup> or <jats:inline-formula><jats:alternatives><jats:tex-math>$$ {D}_s^{-} $$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msubsup> <mml:mi>D</mml:mi> <mml:mi>s</mml:mi> <mml:mo>−</mml:mo> </mml:msubsup> </mml:math></jats:alternatives></jats:inline-formula> decay products. This paper presents the first measurement of <jats:inline-formula><jats:alternatives><jats:tex-math>$$ \mathcal{A} $$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mi>A</mml:mi> </mml:math></jats:alternatives></jats:inline-formula><jats:sup><jats:italic>CP</jats:italic></jats:sup>(<jats:italic>B</jats:italic><jats:sup><jats:italic>−</jats:italic></jats:sup><jats:italic>→</jats:italic><jats:inline-formula><jats:alternatives><jats:tex-math>$$ {D}_s^{\ast -} $$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msubsup> <mml:mi>D</mml:mi> <mml:mi>s</mml:mi> <mml:mrow> <mml:mo>∗</mml:mo> <mml:mo>−</mml:mo> </mml:mrow> </mml:msubsup> </mml:math></jats:alternatives></jats:inline-formula><jats:italic>D</jats:italic><jats:sup>0</jats:sup>) and <jats:inline-formula><jats:alternatives><jats:tex-math>$$ \mathcal{A} $$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mi>A</mml:mi> </mml:math></jats:alternatives></jats:inline-formula><jats:sup><jats:italic>CP</jats:italic></jats:sup>(<jats:italic>B</jats:italic><jats:sup><jats:italic>−</jats:italic></jats:sup><jats:italic>→</jats:italic><jats:inline-formula><jats:alternatives><jats:tex-math>$$ {D}_s^{-} $$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msubsup> <mml:mi>D</mml:mi> <mml:mi>s</mml:mi> <mml:mo>−</mml:mo> </mml:msubsup> </mml:math></jats:alternatives></jats:inline-formula><jats:italic>D</jats:italic><jats:sup><jats:italic>∗</jats:italic>0</jats:sup>), and the most precise measurement of the other five <jats:italic>CP</jats:italic> asymmetries. There is no evidence of <jats:italic>CP</jats:italic> violation in any of the analysed decays. Additionally, two ratios between branching fractions of selected decays are measured.</jats:p>

Item Type: Article
Uncontrolled Keywords: Brain Disorders, Intellectual and Developmental Disabilities (IDD)
Divisions: Faculty of Science and Engineering > School of Physical Sciences
Depositing User: Symplectic Admin
Date Deposited: 15 Apr 2024 07:49
Last Modified: 15 Apr 2024 08:10
DOI: 10.1007/jhep09(2023)202
Open Access URL: https://link.springer.com/content/pdf/10.1007/JHEP...
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URI: https://livrepository.liverpool.ac.uk/id/eprint/3180318