First branching fraction measurement of the suppressed decay ${\Xi }_c^0\to {\pi }^{-}{\Lambda }_c^{+}$

Abstract

The ${\Xi }_c^0$ baryon is unstable and usually decays into charmless final states by the $c\to su\overline{d}$ transition. It can, however, also disintegrate into a ${\pi }^{-}$ meson and a ${\Lambda }_c^{+}$ baryon via $s$ quark decay or via $cs\to dc$ weak scattering. The interplay between the latter two processes governs the size of the branching fraction $\mathcal{B}$$({\Xi }_c^0\to {\pi }^{-}{\Lambda }_c^{+})$, first measured here to be $(0.55\pm 0.02\pm 0.18)$%, where the first uncertainty is statistical and second systematic. This result is compatible with the larger of the theoretical predictions that connect models of hyperon decays using partially conserved axial currents and SU(3) symmetry with those involving the heavy-quark expansion and heavy-quark symmetry. In addition, the branching fraction of the normalization channel, $\mathcal{B}({\Xi }_c^{+}\to p{K}^{-}{\pi }^{+})=(1.135\pm 0.002\pm 0.387)$% is measured.

arXiv commentSixteen pages and three figures. All figures and tables, along with machine-readable versions and any supplementary material and additional information, are available at https://cern.ch/lhcbproject/Publications/p/LHCb-PAPER-2020-016.html (LHCb public pages)

References in corpus (22)

• PYTHIA 6.4 Physics and Manual
• PYTHIA 6.2 Physics and Manual
• A Brief Introduction to PYTHIA 8.1
• LHCb Detector Performance
• PHOTOS Monte Carlo: a precision tool for QED corrections in Z and W decays
• TMVA - Toolkit for Multivariate Data Analysis
• The LHCb Trigger and its Performance in 2011
• Decay Chain Fitting with a Kalman Filter
• Measurements of prompt charm production cross-sections in $pp$ collisions at $\sqrt{s}=13\mathrm{TeV}$
• Measurement of b-hadron fractions in 13 TeV pp collisions
• Observation of two new ${\Xi }_b^{-}$ baryon resonances
• First measurements of absolute branching fractions of ${\Xi }_c^0$ at Belle
• Precision measurement of the ${\Lambda }_c^{+}$, ${\Xi }_c^{+}$ and ${\Xi }_c^0$ baryon lifetimes
• First measurements of absolute branching fractions of the ${\Xi }_c^{+}$ baryon at Belle
• Measurement of the properties of the ${\Xi }_b^{\ast 0}$ baryon
• Measurement of the mass and production rate of ${\Xi }_b^{-}$ baryons
• Evidence for the strangeness-changing weak decay ${\Xi }_b^{-}\to {\Lambda }_b^0{\pi }^{-}$
• Light-Quark Decays in Heavy Hadrons
• Weak decays Xi_Q -> Lambda_Q pi
• Heavy-Flavor-Conserving Hadronic Weak Decays of Heavy Baryons
• From ${\Xi }_b\to {\Lambda }_b\pi$ to ${\Xi }_c\to {\Lambda }_c\pi$
• Update on splitting of lifetimes of $c$ and $b$ hyperons within the heavy quark expansion and decays ${\Xi }_Q\to {\Lambda }_Q\pi$

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• Averages of $b$-hadron, $c$-hadron, and $\tau$-lepton properties as of 2021
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• First Lattice QCD determination of semileptonic decays of charmed-strange baryons ${\Xi }_c$
• Study of heavy quark conserving weak decays in the quark model
• Observation of new baryons in the ${\Xi }_b^{-}{\pi }^{+}{\pi }^{-}$ and ${\Xi }_b^0{\pi }^{+}{\pi }^{-}$ systems
• Heavy-Flavor-Conserving Hadronic Weak Decays of Charmed and Bottom Baryons
• Heavy-Flavor-Conserving Hadronic Weak Decays of Charmed and Bottom Baryons: an Update
• Nonleptonic three-body charmed baryon weak decays with H(15)
• Measurement of the ${\Lambda }_c^{+}$ lifetime
• Nonleptonic decays of ${\Xi }_{cc}\to {\Xi }_c\pi$ with ${\Xi }_c-{\Xi }_c^{\prime }$ mixing
• Search for the doubly heavy baryon ${\Xi }_{bc}^{+}$ decaying to $J/\psi {\Xi }_c^{+}$
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• Doubly charmed baryon decays ${\Xi }_{cc}^{++}\to {\Xi }_c^{(\prime )+}{\pi }^{+}$ in the quark model
• Study of the nonleptonic decay ${\Xi }_c^0\to {\Lambda }_c^{+}{\pi }^{-}$ in the covariant confined quark model
• Axial-vector transition form factors of the singly heavy baryons
• Measurement of the branching fraction of ${\Xi }_c^0\to {\Lambda }_c^{+}{\pi }^{-}$ at Belle
• Revisiting heavy-flavor conserving weak decays of charmed baryons within the nonrelativistic quark model