Title: Measurement of J/ψ and ψ(2S) production in p + p and p + d interactions at 120 GeV
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  1. The time-dependent CP asymmetry in B0J/ψρ(770)0 decays is measured using proton-proton collision data corresponding to an integrated luminosity of 6fb1 , collected with the LHCb detector at a center-of-mass energy of 13 TeV during the years 2015–2018. The CP -violation parameters for this process are determined to be 2 β c c¯ d eff =0.710±0.084±0.051rad and |λ|=1.019±0.034±0.024 , where the first uncertainty is statistical and the second systematic. This constitutes the first observation of time-dependent CP violation in B0J/ψρ(770)0 decays. Assuming approximate SU(3) flavor symmetry, these results are combined with the previous consistent LHCb measurement to set the most stringent constraint on the penguin contribution, Δϕs , to the CP -violating phase ϕs in Bs0J/ψϕ(1020) decays, yielding Δϕs=5.0±4.6mrad
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