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First Observation of the Radiative Decay Λ_{b}^{0}→Λγ.

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The LHCb experiment observed the radiative decay of a beauty baryon (Λ_{b}^{0}→Λγ) for the first time. This groundbreaking discovery provides new insights into particle physics and rare decay processes.

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Area of Science:

  • High Energy Physics
  • Particle Physics
  • Experimental Physics

Background:

  • Radiative decays of beauty hadrons are crucial for testing the Standard Model.
  • Previous studies have focused on beauty mesons, leaving beauty baryon radiative decays largely unexplored.
  • Understanding these decays can reveal new physics beyond the Standard Model.

Purpose of the Study:

  • To report the first observation of the Λ_{b}^{0}→Λγ radiative decay.
  • To measure the branching fraction of this rare decay process.
  • To provide crucial data for theoretical models of heavy quark decays.

Main Methods:

  • Analysis of proton-proton collision data collected by the LHCb experiment at 13 TeV.
  • Utilizing a data sample corresponding to an integrated luminosity of 1.7 fb^{-1}.
  • Employing the B^{0}→K^{*0}γ decay as a normalization mode for precise branching fraction measurement.

Main Results:

  • The radiative decay Λ_{b}^{0}→Λγ was observed for the first time.
  • The branching fraction was measured to be B(Λ_{b}^{0}→Λγ)=(7.1±1.5±0.6±0.7)×10^{-6}.
  • This marks the first observation of a radiative decay involving a beauty baryon.

Conclusions:

  • The observation of Λ_{b}^{0}→Λγ opens a new window into the study of heavy quark decays.
  • The measured branching fraction provides a stringent test for theoretical predictions.
  • This discovery contributes significantly to our understanding of fundamental particle interactions.