Observation of ${\Lambda }_b^0\to D^{+}p{\pi }^{-}{\pi }^{-}$ and ${\Lambda }_b^0\to D^{\ast +}p{\pi }^{-}{\pi }^{-}$ decays

Abstract

The multihadron decays ${\Lambda }_b^0\to D^{+}p{\pi }^{-}{\pi }^{-}$ and ${\Lambda }_b^0\to D^{\ast +}p{\pi }^{-}{\pi }^{-}$ are observed in data corresponding to an integrated luminosity of 3fb${}^{-1}$, collected in proton-proton collisions at centre-of-mass energies of 7 and 8TeV by the LHCb detector. Using the~decay ${\Lambda }_b^0\to {\Lambda }_c^{+}{\pi }^{+}{\pi }^{-}{\pi }^{-}$ as a normalisation channel, the ratio of branching fractions is measured to be $$\frac{\mathcal{B}({\Lambda }_b^0\to D^{+}p{\pi }^{-}{\pi }^{-})}{\mathcal{B}({\Lambda }_b^0\to {\Lambda }_c^{+}{\pi }^{+}{\pi }^{-}{\pi }^{-})}\times \frac{\mathcal{B}(D^{+}\to K^{-}{\pi }^{+}{\pi }^{+})}{\mathcal{B}({\Lambda }_c^{+}\to p{K}^{-}{\pi }^{+})}=(5.35\pm 0.21\pm 0.16)\%,$$ where the first uncertainty is statistical and the second systematic. The ratio of branching fractions for ${\Lambda }_b^0\to D^{\ast +}p{\pi }^{-}{\pi }^{-}$ and ${\Lambda }_b^0\to D^{+}p{\pi }^{-}{\pi }^{-}$ decays is found to be $$\frac{\mathcal{B}({\Lambda }_b^0\to D^{\ast +}p{\pi }^{-}{\pi }^{-})}{\mathcal{B}({\Lambda }_b^0\to D^{+}p{\pi }^{-}{\pi }^{-})}\times (\mathcal{B}(D^{\ast +}\to {\pi }^0)+\mathcal{B}(D^{\ast +}\to \gamma ))=(61.3\pm 4.3\pm 4.0)\%.$$

arXiv commentAll figures and tables, along with any supplementary material and additional information, are available at https://cern.ch/lhcbproject/Publications/p/LHCb-PAPER-2021-040.html

References in corpus (24)

• A Brief Introduction to PYTHIA 8.1
• LHCb Detector Performance
• PHOTOS Monte Carlo: a precision tool for QED corrections in Z and W decays
• sPlot: a statistical tool to unfold data distributions
• Exotica
• Performance of the LHCb RICH detector at the LHC
• Decay Chain Fitting with a Kalman Filter
• Efficient, reliable and fast high-level triggering using a bonsai boosted decision tree
• Measurement of the track reconstruction efficiency at LHCb
• Observation of $J/\psi$ pair production in pp collisions at $\sqrt{s}=7TeV$
• Perturbative QCD Fragmentation Functions as a Model for Heavy-Quark Fragmentation
• Production, Decay, and Polarization of Excited Heavy Hadrons
• Predictions for nonleptonic Lambda_b and Theta_b decays
• Two-body non-leptonic heavy-to-heavy decays at NNLO in QCD factorization
• Nonleptonic two-body decays of single heavy baryons ${\Lambda }_Q$, ${\Xi }_Q$, and ${\Omega }_Q$ $(Q=b,c)$ induced by $W$ emission in the covariant confined quark model
• Hadron Systematics and Emergent Diquarks
• Studies of beauty baryon decays to $D^{0}p{h}^{-}$ and ${\Lambda }_c^{+}{h}^{-}$ final states
• Study of beauty hadron decays into pairs of charm hadrons
• Production cross sections of hyperons and charmed baryons from $e^{+}{e}^{-}$ annihilation near $\sqrt{s}=10.52$~GeV
• Diquarks as Inspiration and as Objects
• Measurement of $\sigma ({\Lambda }_b)/\sigma (B^0)\times BR({\Lambda }_b\to {\Lambda }_c{\pi }^{-})/BR(B^0\to D^{+}{\pi }^{-})$ in $p\bar{p}$ Collisions at $\sqrt{s}=1.96$ TeV
• Observation of the Radiative Decay $D^{\ast +}\to D^{+}\gamma$
• Λ_b \to Λ_c P(V) Nonleptonic Weak Decays
• ${\Lambda }_b\to \Lambda +D({\bar{D}}^0)$ decays and CP-violation