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  3. First Evidence Of The B_{s}^{0}→k^{-}π^{+}γ Decay.
  1. Home
  3. First Evidence Of The B_{s}^{0}→k^{-}π^{+}γ Decay.

Related Experiment Video

Setting Limits on Supersymmetry Using Simplified Models
07:46

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Published on: November 15, 2013

First Evidence of the B_{s}^{0}→K^{-}π^{+}γ Decay.

R Aaij1, A S W Abdelmotteleb2, C Abellan Beteta3

  • 1Nikhef National Institute for Subatomic Physics, Amsterdam, Netherlands.

Physical Review Letters
|May 15, 2026

View abstract on PubMed

Summary
This summary is machine-generated.

Researchers report the first experimental evidence for the B_{s}^{0}→K^{-}π^{+}γ decay using LHCb data. This observation, with 3.5 standard deviations significance, aligns with Standard Model predictions.

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Area of Science:

  • Particle Physics
  • High Energy Physics
  • Quantum Chromodynamics

Background:

  • The B_{s}^{0}→K^{-}π^{+}γ decay is a rare B-meson decay.
  • Previous searches had not established experimental evidence for this decay mode.

Purpose of the Study:

  • To perform the first search for the B_{s}^{0}→K^{-}π^{+}γ decay.
  • To measure the ratio of branching fractions for this decay relative to the favored B[over ¯]^{0}→K^{-}π^{+}γ decay.

Main Methods:

  • Utilized proton-proton collision data from the LHCb experiment at 7, 8, and 13 TeV.
  • Reconstructed photons via electron-positron pair conversion for improved mass resolution.
  • Analyzed the invariant mass spectrum of K^{-}π^{+} pairs in the range 796-1800 MeV/c².

Main Results:

  • Observed a signal excess with 3.5 standard deviations significance, providing the first experimental evidence for B_{s}^{0}→K^{-}π^{+}γ.
  • Measured the ratio R=(3.7±1.2±0.4)×10^{-2} in the 796-996 MeV/c² range, consistent with the Standard Model.
  • Measured R=(0.2±2.7±1.3)×10^{-2} in the 996-1800 MeV/c² range.

Conclusions:

  • Established the first experimental evidence for the B_{s}^{0}→K^{-}π^{+}γ decay.
  • The measured branching fraction ratios are consistent with Standard Model predictions.
  • The improved mass resolution from photon conversion aids in precise measurements of rare decays.