Amplitude analysis of the ${\Lambda }_b^0\to p{K}^{-}\gamma$ decay

Abstract

The resonant structure of the radiative decay ${\Lambda }_b^0\to p{K}^{-}\gamma$ in the region of proton-kaon invariant-mass up to 2.5 GeV$/c^2$ is studied using proton-proton collision data recorded at centre-of-mass energies of 7, 8, and 13 TeV collected with the LHCb detector, corresponding to a total integrated luminosity of 9 fb${}^{-1}$. Results are given in terms of fit and interference fractions between the different components contributing to this final state. Only $\Lambda$ resonances decaying to $p{K}^{-}$ are found to be relevant, where the largest contributions stem from the $\Lambda (1520)$, $\Lambda (1600)$, $\Lambda (1800)$, and $\Lambda (1890)$ states.

arXiv commentAll 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-2023-036.html (LHCb public pages)

References in corpus (13)

• A Brief Introduction to PYTHIA 8.1
• sPlot: a statistical tool to unfold data distributions
• Decay Chain Fitting with a Kalman Filter
• LHCb Topological Trigger Reoptimization
• Rare dileptonic decays of Λ_b in a quark model
• Photon polarization from helicity suppression in radiative decays of polarized Lambda_b to spin-3/2 baryons
• Parameter uncertainties in weighted unbinned maximum likelihood fits
• Hyperon II: Properties of excited hyperons
• Resonances in QCD
• SU(3)${}_F$ Analysis for Beauty Baryon Decays
• Hyperon I: Partial wave amplitudes for $K^{-}p$ scattering
• Lepton polarization asymmetries for FCNC decays of the ${\Lambda }_b$ baryon
• Towards an amplitude analysis of the decay ${\Lambda }_b^0\to p{K}^{-}\gamma$