Search for CP violation in $$ {D}_{(s)}^{+} $$ → K−K+K+ decays



Aaij, R, Abdelmotteleb, ASW, Abellan Beteta, C, Abudinén, F, Ackernley, T, Adeva, B, Adinolfi, M, Adlarson, P, Afsharnia, H, Agapopoulou, C
et al (show 1050 more authors) (2023) Search for CP violation in $$ {D}_{(s)}^{+} $$ → K−K+K+ decays. Journal of High Energy Physics, 2023 (7).

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Abstract

<jats:title>A<jats:sc>bstract</jats:sc> </jats:title><jats:p>A search for direct <jats:italic>CP</jats:italic> violation in the Cabibbo-suppressed decay <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>→ K</jats:italic><jats:sup><jats:italic>−</jats:italic></jats:sup><jats:italic>K</jats:italic><jats:sup>+</jats:sup><jats:italic>K</jats:italic><jats:sup>+</jats:sup> and in the doubly Cabibbo-suppressed decay <jats:italic>D</jats:italic><jats:sup>+</jats:sup> → <jats:italic>K</jats:italic><jats:sup><jats:italic>−</jats:italic></jats:sup><jats:italic>K</jats:italic><jats:sup>+</jats:sup><jats:italic>K</jats:italic><jats:sup>+</jats:sup> is reported. The analysis is performed with data collected by the LHCb experiment in proton-proton collisions at a centre-of-mass energy of 13 TeV corresponding to an integrated luminosity of 5.6 fb<jats:sup><jats:italic>−</jats:italic>1</jats:sup>. The search is conducted by comparing the <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:mfenced> <mml:mi>s</mml:mi> </mml:mfenced> <mml:mo>+</mml:mo> </mml:msubsup> </mml:math></jats:alternatives></jats:inline-formula> and <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:mfenced> <mml:mi>s</mml:mi> </mml:mfenced> <mml:mo>−</mml:mo> </mml:msubsup> </mml:math></jats:alternatives></jats:inline-formula> Dalitz-plot distributions through a model-independent binned technique, based on fits to the <jats:italic>K</jats:italic><jats:sup><jats:italic>−</jats:italic></jats:sup><jats:italic>K</jats:italic><jats:sup>+</jats:sup><jats:italic>K</jats:italic><jats:sup>+</jats:sup> invariant-mass distributions, with a total of 0.97 (1.27) million <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:sup>) signal candidates. The results are given as <jats:italic>p</jats:italic>-values for the hypothesis of <jats:italic>CP</jats:italic> conservation and are found to be 13.3% for the <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>→ K</jats:italic><jats:sup><jats:italic>−</jats:italic></jats:sup><jats:italic>K</jats:italic><jats:sup>+</jats:sup><jats:italic>K</jats:italic><jats:sup>+</jats:sup> decay and 31.6% for the <jats:italic>D</jats:italic><jats:sup>+</jats:sup><jats:italic>→ K</jats:italic><jats:sup><jats:italic>−</jats:italic></jats:sup><jats:italic>K</jats:italic><jats:sup>+</jats:sup><jats:italic>K</jats:italic><jats:sup>+</jats:sup> decay. No evidence for <jats:italic>CP</jats:italic> violation is observed in these decays.</jats:p>

Item Type: Article
Divisions: Faculty of Science and Engineering > School of Physical Sciences
Depositing User: Symplectic Admin
Date Deposited: 18 Sep 2023 08:04
Last Modified: 18 Sep 2023 08:04
DOI: 10.1007/jhep07(2023)067
Open Access URL: https://link.springer.com/content/pdf/10.1007/JHEP...
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URI: https://livrepository.liverpool.ac.uk/id/eprint/3172812