Observation of $${{\mathrm {B}} ^+} \rightarrow {{\mathrm {J}/\uppsi }} 3{{\uppi } ^+} 2{{\uppi } ^-} $$ B + → J / ψ 3 π + 2 π - and $${{\mathrm {B}} ^+} \rightarrow {\uppsi

Abstract

The decays and are observed for the first time using a data sample corresponding to an integrated luminosity of 3.0 fb, collected by the LHCb experiment in proton–proton collisions at the centre-of-mass energies of 7 and 8. The branching fractions relative to that of are measured to be where the first uncertainties are statistical and the second are systematic.

Excited ρ mesons in Bc→ψ(′Luchinsky1 2019Phys. Rev. D3030View full textAdd to dashboardCite

“…In a series of papers (see, for example, [6][7][8][9][10][11]) it was shown how the QCD factorization theorem can be used to connect differential branching fraction of light mesons' production in exclusive τ lepton and B c meson decays. Predictions presented in these article are in good agreement with experimental results [12][13][14][15][16]. It could be interesting to try such an approach for B c → J/ψKK S and B c → ψ(2S)KK S decays.…”

Weak decays of doubly heavy baryons: Decays to a system of π mesons

“…where squared transferred momentum q 2 is measured in GeV 2 . Comparison with later experimental results [14][15][16][17] showed that these spectral functions suits well for theoretical description of exclusive decays of B c -mesons, so we can expect that in case of studied in our article processes they can also be used.…”

Exclusive decays of the doubly heavy baryon Ξbc

“…If we are interested in q 2 distributions or the values of the integrated branching fractions only, it is possible to obtain the analytical expressions with the help of the spectral function formalism. This method was successfully used, for example, for description of τ -lepton [30,31] or B c meson [32][33][34][35][36] decays.…”