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A<sc>bstract</sc> A time-dependent, flavour-tagged measurement ofCPviolation is performed withB0→ D+D−and$$ {B}_s^0 $$ →$$ {D}_s^{+}{D}_s^{-} $$ decays, using data collected by the LHCb detector in proton-proton collisions at a centre-of-mass energy of 13 TeV corresponding to an integrated luminosity of 6 fb−1. InB0→ D+D−decays theCP-violation parameters are measured to be$$ {\displaystyle \begin{array}{c}{S}_{D^{+}{D}^{-}}=-0.552\pm 0.100\left(\textrm{stat}\right)\pm 0.010\left(\textrm{syst}\right),\\ {}{C}_{D^{+}{D}^{-}}=0.128\pm 0.103\left(\textrm{stat}\right)\pm 0.010\left(\textrm{syst}\right).\end{array}} $$ In$$ {B}_s^0 $$ →$$ {D}_s^{+}{D}_s^{-} $$ decays theCP-violating parameter formulation in terms ofϕsand|λ|results in$$ {\displaystyle \begin{array}{c}{\phi}_s=-0.086\pm 0.106\left(\textrm{stat}\right)\pm 0.028\left(\textrm{syst}\right)\textrm{rad},\\ {}\mid {\lambda}_{D_s^{+}{D}_s^{-}}\mid =1.145\pm 0.126\left(\textrm{stat}\right)\pm 0.031\left(\textrm{syst}\right).\end{array}} $$ These results represent the most precise single measurement of theCP-violation parameters in their respective channels. For the first time in a single measurement,CPsymmetry is observed to be violated inB0→ D+D−decays with a significance exceeding six standard deviations.
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This content will become publicly available on February 15, 2026
Novel $$H^\textrm{dev}(\textrm{Curl})$$-conforming elements on regular triangulations and Clough–Tocher splits for the planar relaxed micromorphic model
- Award ID(s):
- 2136228
- PAR ID:
- 10580111
- Publisher / Repository:
- Springer Nature
- Date Published:
- Journal Name:
- Computational Mechanics
- ISSN:
- 0178-7675
- Format(s):
- Medium: X
- Sponsoring Org:
- National Science Foundation
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