Measurement of the CKM angle γ in the B0→DK *0 channel using self-conjugate D→ KS0h+ h- decays

A model-independent study of CP violation in B-0 -> DK (*0) decays is presented using data corresponding to an integrated luminosity of 9 fb(-1) collected by the LHCb experiment at centre-of-mass energies of v s = 7, 8 and 13TeV. The CKM angle. is determined by examining the distributions of signal decays in phase-space bins of the self-conjugate D. K(S)(0)h(+) h(-) decays, where h = p, K. Observables related to CP violation are measured and the angle. is determined to be. = (49+22 -19).. Measurements of the amplitude ratio and strong-phase difference between the favoured and suppressed B-0 decays are also presented

Search for D∗(2007)0→μ+μ−D^{*}(2007)^{0} \rightarrow \mu ^{+} \mu ^{-} in B−→π−μ+μ−B^{-}\rightarrow \pi ^{-} \mu ^{+} \mu ^{-} decays

AbstractThe very rare $${{D} ^*} (2007)^0\!\rightarrow {\mu ^+\mu ^-}$$ D ∗ ( 2007 ) 0 → μ + μ - decay is searched for by analysing $${{{B} ^-}} \!\rightarrow {{\pi } ^-} {\mu ^+\mu ^-}$$ B - → π - μ + μ - decays. The analysis uses a sample of beauty mesons produced in proton–proton collisions collected with the LHCb detector between 2011 and 2018, corresponding to an integrated luminosity of 9$$\text {\,fb} ^{-1}$$ \,fb - 1 . The signal signature corresponds to simultaneous peaks in the $${\mu ^+\mu ^-}$$ μ + μ - and $${{\pi } ^-} {\mu ^+\mu ^-}$$ π - μ + μ - invariant masses. No evidence for an excess of events over background is observed and an upper limit is set on the branching fraction of the decay at \mathcal{B}({{D} ^*} (2007)^0\!\rightarrow {\mu ^+\mu ^-} ) < 2.6\times 10^{-8} B ( D ∗ ( 2007 ) 0 → μ + μ - ) &lt; 2.6 × 10 - 8 at $$90\%$$ 90 % confidence level. This is the first limit on the branching fraction of $${{D} ^*} (2007)^0\!\rightarrow {\mu ^+\mu ^-}$$ D ∗ ( 2007 ) 0 → μ + μ - decays and the most stringent limit on $${{D} ^*} (2007)^0$$ D ∗ ( 2007 ) 0 decays to leptonic final states. The analysis is the first search for a rare charm-meson decay exploiting production via beauty decays.</jats:p

Evidence for the decays B0 → (D)over-bar(*)0φ and updated measurements of the branching fractions of the Bs0 → (D)over-bar(*)0φ decays

Evidence for the decays B-0 -&gt; (D) over bar (0)phi and B-0 -&gt; (D) over bar (*0) phi is reported with a significance of 3.6 sigma and 4.3 sigma, respectively. The analysis employs pp collision data at centre-of-mass energies root s = 7, 8 and 13TeV collected by the LHCb detector and corresponding to an integrated luminosity of 9 fb(-1). The branching fractions are measured to beB(B-0 -&gt; (D) over bar (0)phi) = (7.7 +/- 2.1 +/- 0.7 +/- 0.7) x 10(-7),B(B-0 -&gt; (D) over bar (*0)phi) = (2.2 +/- 05 +/- 0.2 +/- 0.2) x 10(-6).In these results, the first uncertainty is statistical, the second systematic, and the third is related to the branching fraction of the B-0 -&gt; (D) over bar K-0(+) K- decay, used for normalisation. By combining the branching fractions of the decays B-0 -&gt; (D) over bar ((*)0)phi and B-0 -&gt; (D) over bar ((*)0)omega, the omega-phi mixing angle delta is constrained to be tan(2)delta = (3.6 +/- 0.7 +/- 0.4) x 10(-3), where the first uncertainty is statistical and the second systematic. An updated measurement of the branching fractions of the B-s(0) -&gt; (D) over bar ((*)0).phi decays, which can be used to determine the CKM angle gamma, leads toB(B-s(0) -&gt; (D) over bar (0)phi) = (2.30 +/- 0.10 +/- 0.11 +/- 0.20) x 10(-5),B(B-s(0) -&gt; (D) over bar (*0)phi) = (3.17 +/- 0.16 +/- 0.17 +/- 0.27) x 10(-5)

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

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 $${D}_s^{\ast -}$$ D s ∗ − meson are analysed by reconstructing only the D0 or $${D}_s^{-}$$ D s − decay products. This paper presents the first measurement of $$\mathcal{A}$$ A CP(B−→$${D}_s^{\ast -}$$ D s ∗ − D0) and $$\mathcal{A}$$ A CP(B−→$${D}_s^{-}$$ D s − 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.</jats:p

Search for CP violation in the phase space of D0 → π−π+π0 decays with the energy test

Abstract A search for CP violation in D0 → π−π+π0 decays is reported, using pp collision data collected by the LHCb experiment from 2015 to 2018 corresponding to an integrated luminosity of 6 fb−1. An unbinned model-independent approach provides sensitivity to local CP violation within the two-dimensional phase space of the decay. The method is validated using the Cabibbo-favoured channel D0 → K−π+π0 and background regions of the signal mode. The results are consistent with CP symmetry in this decay.</jats:p