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Kaon Photoproduction and the Λ Decay Parameter α_{-}.

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  • 1SUPA, School of Physics and Astronomy, University of Glasgow, Glasgow G12 8QQ, United Kingdom.

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|November 26, 2019
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This study re-evaluates the weak decay parameter alpha_(-) for Lambda (Λ) baryons. Our findings support a significantly larger value than previously accepted, impacting polarization measurements and matter-antimatter asymmetry studies.

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Area of Science:

  • Particle Physics
  • Hadron Spectroscopy

Background:

  • The weak decay parameter alpha_(-) of the Lambda (Λ) baryon is crucial for extracting polarization observables in experiments.
  • It also influences matter-antimatter asymmetry measurements when combined with alpha_(+) from anti-Lambda (Λ[over ¯]) decay.
  • This parameter affects decay parameters of Ξ and Ω baryons and any quantity involving Λ polarization.

Purpose of the Study:

  • To independently estimate the weak decay parameter alpha_(-).
  • To address the discrepancy between the recent BESIII Collaboration value and the long-standing Particle Data Group (PDG) value.
  • To provide a more accurate value for alpha_(-) impacting various physics analyses.

Main Methods:

  • Utilized an extensive dataset of polarization measurements from kaon photoproduction in the baryon resonance region.
  • Applied constraints derived from spin algebra.
  • Performed multiple statistical tests and employed a modern phenomenological model for corroboration.

Main Results:

  • An independent estimate of the weak decay parameter alpha_(-) was obtained as 0.721(6)(5).
  • This new value is significantly larger than the previous PDG value of 0.642(13).
  • The analysis supports the BESIII Collaboration's recent finding of a larger alpha_(-).

Conclusions:

  • The revised value of alpha_(-) provides a better description of the analyzed data.
  • Experimental quantities relying on alpha_(-) need reconsideration due to the updated value.
  • This research highlights the importance of precise determination of fundamental particle decay parameters.