A model-independent measurement of the CKM angle γ in partially reconstructed B± → D*h± decays with D → 𝐾0𝑆 h+h− (h = π, K)
Author(s)
Aaij, R.; Abdelmotteleb, A. S. W.; Abellan Beteta, C.; Abudinén, F.; Ackernley, T.; Adeva, B.; Adinolfi, M.; Adlarson, P.; Agapopoulou, C.; Aidala, C. A.; Ajaltouni, Z.; Akar, S.; Akiba, K.; Albicocco, P.; Albrecht, J.; Alessio, F.; ... Show more Show less
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A measurement of <jats:italic>CP</jats:italic>-violating observables in <jats:italic>B</jats:italic><jats:sup>±</jats:sup> → <jats:italic>D</jats:italic><jats:sup>*</jats:sup><jats:italic>K</jats:italic><jats:sup>±</jats:sup> and <jats:italic>B</jats:italic><jats:sup>±</jats:sup> → <jats:italic>D</jats:italic><jats:sup>*</jats:sup>π<jats:sup>±</jats:sup> decays is made where the photon or neutral pion from the <jats:italic>D</jats:italic><jats:sup>*</jats:sup><jats:italic>→ D</jats:italic>γ or <jats:italic>D</jats:italic><jats:sup>*</jats:sup><jats:italic>→ D</jats:italic>π<jats:sup>0</jats:sup> decay is not reconstructed. The <jats:italic>D</jats:italic> meson is reconstructed in the self-conjugate decay modes, <jats:italic>D</jats:italic> → <jats:inline-formula><jats:alternatives><jats:tex-math>$$ {K}_S^0 $$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML">
<mml:msubsup>
<mml:mi>K</mml:mi>
<mml:mi>S</mml:mi>
<mml:mn>0</mml:mn>
</mml:msubsup>
</mml:math></jats:alternatives></jats:inline-formula>π<jats:sup>+</jats:sup>π<jats:sup>−</jats:sup> or <jats:italic>D</jats:italic> → <jats:inline-formula><jats:alternatives><jats:tex-math>$$ {K}_S^0 $$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML">
<mml:msubsup>
<mml:mi>K</mml:mi>
<mml:mi>S</mml:mi>
<mml:mn>0</mml:mn>
</mml:msubsup>
</mml:math></jats:alternatives></jats:inline-formula><jats:italic>K</jats:italic><jats:sup>+</jats:sup><jats:italic>K</jats:italic><jats:sup>−</jats:sup>. The distribution of signal yields in the <jats:italic>D</jats:italic> decay phase space is analysed in a model-independent way. The measurement uses a data sample collected in proton-proton collisions at centre-of-mass energies of 7, 8, and 13 TeV, corresponding to a total integrated luminosity of approximately 9 fb<jats:sup><jats:italic>−</jats:italic>1</jats:sup>. The <jats:italic>B</jats:italic><jats:sup>±</jats:sup> → <jats:italic>D</jats:italic><jats:sup>*</jats:sup><jats:italic>K</jats:italic><jats:sup>±</jats:sup> and <jats:italic>B</jats:italic><jats:sup>±</jats:sup> → <jats:italic>D</jats:italic><jats:sup>*</jats:sup>π<jats:sup>±</jats:sup><jats:italic>CP</jats:italic>-violating observables are interpreted in terms of hadronic parameters and the CKM angle γ, resulting in a measurement of γ = (<jats:inline-formula><jats:alternatives><jats:tex-math>$$ {92}_{-17}^{+21} $$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML">
<mml:msubsup>
<mml:mn>92</mml:mn>
<mml:mrow>
<mml:mo>−</mml:mo>
<mml:mn>17</mml:mn>
</mml:mrow>
<mml:mrow>
<mml:mo>+</mml:mo>
<mml:mn>21</mml:mn>
</mml:mrow>
</mml:msubsup>
</mml:math></jats:alternatives></jats:inline-formula>)<jats:sup><jats:italic>°</jats:italic></jats:sup>. The total uncertainty includes the statistical and systematic uncertainties, and the uncertainty due to external strong-phase inputs.
Date issued
2024-02-16Department
Massachusetts Institute of Technology. Department of PhysicsJournal
Journal of High Energy Physics
Publisher
Springer Science and Business Media LLC
Citation
The LHCb collaboration., Aaij, R., Abdelmotteleb, A.S.W. et al. A model-independent measurement of the CKM angle γ in partially reconstructed B± → D*h± decays with D → 𝐾0𝑆
h+h− (h = π, K). J. High Energ. Phys. 2024, 118 (2024).
Version: Final published version
ISSN
1029-8479
Keywords
Nuclear and High Energy Physics