Lawrence Berkeley National Laboratory

The decays B+→J/ψ3π+2π-$${{\mathrm {B}} ^+} \rightarrow {{\mathrm {J}/\uppsi }} 3{{\uppi } ^+} 2{{\uppi } ^-} $$ and B+→ψ(2S)π+π+π-$${{\mathrm {B}} ^+} \rightarrow {\uppsi {(2\mathrm {S})}} {{\uppi } ^+} {{\uppi } ^+} {{\uppi } ^-} $$ are observed for the first time using a data sample corresponding to an integrated luminosity of 3.0 fb-1$$^{-1}$$, collected by the LHCb experiment in proton–proton collisions at the centre-of-mass energies of 7 and 8TeV$$\mathrm {\,TeV}$$. The branching fractions relative to that of B+→ψ(2S)K+$${{\mathrm {B}} ^+} \rightarrow {\uppsi {(2\mathrm {S})}} {{\mathrm {K}} ^+} $$ are measured to be B(B+→J/ψ3π+2π-)B(B+→ψ(2S)K+)=(1.88±0.17±0.09)×10-2,B(B+→ψ(2S)π+π+π-)B(B+→ψ(2S)K+)=(3.04±0.50±0.26)×10-2,$$\begin{aligned} \dfrac{{\mathcal {B}} ( {{\mathrm {B}} ^+} \rightarrow {{\mathrm {J}/\uppsi }} 3{{\uppi } ^+} 2{{\uppi } ^-} )}{{\mathcal {B}} ( {{\mathrm {B}} ^+} \rightarrow {\uppsi {(2\mathrm {S})}} {{\mathrm {K}} ^+} )}= & {} ( 1.88\!\pm \! 0.17\!\pm \! 0.09)\!\times \! 10^{-2}, \ \dfrac{{\mathcal {B}} ( {{\mathrm {B}} ^+} \rightarrow {\uppsi {(2\mathrm {S})}} {{\uppi } ^+} {{\uppi } ^+} {{\uppi } ^-} )}{{\mathcal {B}} ( {{\mathrm {B}} ^+} \rightarrow {\uppsi {(2\mathrm {S})}} {{\mathrm {K}} ^+} )}= & {} ( 3.04\!\pm \!0.50\!\pm \!0.26)\!\times \! 10^{-2}, \end{aligned}$$where the first uncertainties are statistical and the second are systematic.