A search for the non-resonant decays B → μ μ μ μ and B → μ μ μ μ is presented. The measurement is performed using the full Run 1 data set collected in proton-proton collisions by the LHCb experiment at the LHC. The data correspond to integrated luminosities of 1 and 2 fb collected at centre-of-mass energies of 7 and 8 TeV, respectively. No signal is observed and upper limits on the branching fractions of the non-resonant decays at 95% confidence level are determined to beℬ(Bs0→μ+μ−μ+μ−)<2.5×10−9,[Figure not available: see fulltext.] s 0 + − + − 0 + − + − −1

A search for the charmless B → η′ϕ decay is performed using pp collision data collected by the LHCb experiment at centre-of-mass energies of 7 and 8 TeV, corresponding to an integrated luminosity of 3 fb . No signal is observed and upper limits on the B → η′ϕ branching fraction are set to 0.82 × 10 at 90% and 1.01 × 10 at 95% confidence level.[Figure not available: see fulltext.]. s s 0 −1 0 −6 −6

The 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 TeV, corresponding to an integrated luminosity of 279 ±11 pb . 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.[Figure not available: see fulltext.]. −1

A search for the rare two-body charmless baryonic decay B → pΛ¯ is performed with pp collision data, corresponding to an integrated luminosity of 3 fb , collected by the LHCb experiment at centre-of-mass energies of 7 and 8 TeV. An excess of B →pΛ¯ candidates with respect to background expectations is seen with a statistical significance of 4.1 standard deviations, and constitutes the first evidence for this decay. The branching fraction, measured using the B →K π decay for normalisation,(Formula Presented.)where the first uncertainty is statistical and the second systematic.[Figure not available: see fulltext.]. + −1 + + 0 + S

An amplitude analysis of the decay Λ → D pπ is performed in the part of the phase space containing resonances in the D p channel. The study is based on a data sample corresponding to an integrated luminosity of 3.0 fb of pp collisions recorded by the LHCb experiment. The spectrum of excited Λ states that decay into D p is studied. The masses, widths and quantum numbers of the Λ (2880) and Λ (2940) resonances are measured. The constraints on the spin and parity for the Λ (2940) state are obtained for the first time. A near-threshold enhancement in the D p amplitude is investigated and found to be consistent with a new resonance, denoted the Λ (2860) , of spin 3/2 and positive parity. b c c c c c 0 0 − 0 −1 + 0 + + + 0 +