Journal Article

Observation of $Λ^0_b$ → $D^+ρπ^-π^-$ and $Λ^0_b$ → $D^{+}ρπ^-π^-$ decays

Olivares, M. E., Vorobyev, V., Chefdeville, M., Alexander, M., Dashkina, A., Jones, C. R., Durante, P., Malczewski, J. J., Gao, Y., Eschle, J., Brossa Gonzalo, A., Yang, Z., Petric, M., Cardinale, R., Mead, J. V., Barlow, R. J., Schmelling, M., Vázquez Sierra, C., Zhou, T., Cai, H., Bedeschi, F., Swientek, K., Yang, Y., Millard, E., Pugatch, V., Ketel, T., Bobulska, D., Ferro-Luzzi, M., Lefèvre, R., Zhang, S., Solovev, A., Golubkov, D., Passalacqua, B., Baptista de Souza Leite, J., Terentev, A., Lampis, A., Dalseno, J., Jawahery, A., Lai, A., Schneider, O., Rama, M., Bozzi, C., Carniti, P., Fontana, M., Ene, A., Tanner, A. R., Smith, E., Zhou, X., Gibson, V., Mulder, M., Ramos Pernas, M., Hollitt, S. E., Bezshyiko, Ia, Ribatti, R., Bertella, C., Tuning, N., Zharkova, A., Cobbledick, J. L., Kvaratskheliya, T., Morris, A. B., Carboni, G., Downes, A. G., Zenaiev, O., Puill, V., Didenko, S., McNulty, R., Baldini, W., Ponce, S., Karacson, M., Marshall, A. M., Bian, L., Decamp, D., Hancock, T. H., Brea Rodriguez, A., Skidmore, N., Chulikov, V., Romanovskiy, V., Malecki, B., Cadeddu, S., Pappagallo, M., Nanut, T., Materok, M., Merli, A., Epple, E., Dey, B., L

2022

Overview

The multihadron decays $Λ^0_b$ → $D+ρπ-π-$ and $Λ^0_b$ → $D^*+ρπ-π-$ are observed in data corresponding to an integrated luminosity of 3 fb-1, collected in proton-proton collisions at centre-of-mass energies of 7 and 8 TeV by the LHCb detector. Using the decay $Λ^0_b$ → $Λ^+_cπ^+π^-π^-$ as a normalisation channel, the ratio of branching fractions is measured to be $\\frac {\\mathcal{B} ( Λ^0_b → D^+ρπ^-π^-)} {\\mathcal{B} (Λ^0_b → Λ^0_cπ^+π^-π^-)}$ x $\\frac{\\mathcal{B} (D^+ → K^-π^+π^+)} {\\mathcal{B}(Λ^o_c → ρK^-π^-)}$ = (%.35 ± 0.21 ± 0.16)%, where the first uncertainty is statistical and the second systematic. The ratio of branching fractions for the $Λ^0_b$ → $D^{*+}ρπ^-π^-$ and $Λ^0_b$ → $D^+ρπ^-π^-$ decays is found to be $\\frac {\\mathcal{B} ( Λ^0_b → D^{*+}ρπ^-π^-)} {\\mathcal{B} (Λ^0_b → D^+ρπ^-π^-)}$ X ($\\mathcal{B} (D^{*+}→ D^+π^0)$ + $\\mathcal{B} (D^{*+}→ D^+γ)$) = (61.3 ± 4.3 ± 4.0)%.

• Publisher: Springer Nature
• Subject: B physics / branching fraction / flavour physics / hadron-hadron scattering