M. Vernet

Measurement of the CP violation parameter AΓ in D0→K+K− and D0→π+π− decays

Asymmetries in the time-dependent rates of D^{0}→K^{+}K^{-} and D^{0}→π^{+}π^{-} decays are measured in a pp collision data sample collected with the LHCb detector during LHC Run 1, corresponding to an integrated luminosity of 3  fb^{-1}. The asymmetries in effective decay widths between D^{0} and D[over ¯]^{0} decays, sensitive to indirect CP violation, are measured to be A_{Γ}(K^{+}K^{-})=(-0.30±0.32±0.10)×10^{-3} and A_{Γ}(π^{+}π^{-})=(0.46±0.58±0.12)×10^{-3}, where the first uncertainty is statistical and the second systematic. These measurements show no evidence for CP violation and improve on the precision of the previous best measurements by nearly a factor of two.

Measurement of the J/ψ pair production cross-section in pp collisions at s=13 TeV

A bstractThe production cross-section of J/ψ pairs is measured using a data sample of pp collisions collected by the LHCb experiment at a centre-of-mass energy of s=13

Observation of ηc(2S)→pp¯ and search for X(3872)→pp¯ decays

\sqrt{s}=13

First study of the CP-violating phase and decay-width difference in View the MathML sourceBs0→ψ(2S)ϕ decays

TeV, corresponding to an integrated luminosity of 279 ±11 pb−1. The measurement is performed for J/ψ mesons with a transverse momentum of less than 10 GeV/c in the rapidity range 2.0 < y < 4.5. The production cross-section is measured to be 15.2 ± 1.0 ± 0.9 nb. The first uncertainty is statistical, and the second is systematic. The differential cross-sections as functions of several kinematic variables of the J/ψ pair are measured and compared to theoretical predictions.

Search for the B0s→η′φ decay

A study of B+c→K+K−π+ decays is performed for the first time using data corresponding to an integrated luminosity of 3.0 fb−1 collected by the LHCb experiment in pp collisions at centre-of-mass energies of 7 and 8 TeV. Evidence for the decay B+c→χc0(→K+K−)π+ is reported with a significance of 4.0 standard deviations, resulting in the measurement of σ(B+c)σ(B+)×B(B+c→χc0π+) to be (9.8+3.4−3.0(stat)±0.8(syst))×10−6. Here B denotes a branching fraction while σ(B+c) and σ(B+) are the production cross-sections for B+c and B+ mesons. An indication of b¯c weak annihilation is found for the region m(K−π+)<1.834GeV/c2, with a significance of 2.4 standard deviations.

Observation of the Annihilation Decay Mode B0 →k+K-

The first observation of the decay

Observation of B+c→D0K+ Decays

\eta_{c}(2S) \to p \bar p

Observation of the suppressed decay Λ0b→pπ−μ+μ−

is reported using proton-proton collision data corresponding to an integrated luminosity of