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

Lesya Shchutska, Olivier Schneider, Aurelio Bay, Guido Haefeli, Frédéric Blanc, Tatsuya Nakada, Michel De Cian, Elena Graverini, Renato Quagliani, Aravindhan Venkateswaran, Veronica Sølund Kirsebom, Elisabeth Maria Niel, Ettore Zaffaroni, Donal Patrick Hill, Maria Vieites Diaz, Vladimir Macko, Sebastian Schulte, Lino Ferreira Lopes, Surapat Ek-In, Carina Trippl, Sara Celani, Serhii Cholak, Ana Bárbara Rodrigues Cavalcante
2023

Abstract

The CP asymmetries of seven B- decays to two charm mesons are measured using data corresponding to an integrated luminosity of 9 fb(-1) of proton-proton collisions collected by the LHCb experiment. Decays involving a D*(0) or Ds(-) meson are analysed by reconstructing only the D0 or Ds(-) decay products. This paper presents the first measurement of A(CP) (B- → Ds(-) D0) and A(CP) (B- → Ds(-) D*(0)), and the most precise measurement of the other five CP asymmetries. There is no evidence of CP violation in any of the analysed decays. Additionally, two ratios between branching fractions of selected decays are measured.

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