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Properties of the Lambda(1670)(1-)/2 resonance.

D M Manley1, V V Abaev, C E Allgower

  • 1Kent State University, Kent, Ohio 44242-0001, USA.

Physical Review Letters
|January 22, 2002
PubMed
Summary

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New analysis of the K(-)p-->etaLambda reaction, dominated by Lambda(1670)1/2(-), reveals significantly higher elasticity. Resonance parameters align with quark-model predictions, advancing particle physics understanding.

Area of Science:

  • Particle Physics
  • Hadron Spectroscopy
  • Quantum Chromodynamics

Background:

  • The K(-)p-->etaLambda reaction is crucial for studying hadron spectroscopy.
  • The Lambda(1670)1/2(-) resonance is a key focus in understanding quark-antiquark interactions.

Purpose of the Study:

  • To perform a unitary, multichannel analysis incorporating new Crystal Ball data for the K(-)p-->etaLambda reaction.
  • To precisely determine the resonance parameters of the Lambda(1670)1/2(-) state.

Main Methods:

  • Unitary, multichannel analysis framework.
  • Inclusion of recent, precise experimental data from the Crystal Ball Collaboration.
  • Resonance parameter extraction through fitting procedures.

Main Results:

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  • The analysis yields a mass M = 1673+/-2 MeV and width Gamma = 23+/-6 MeV for the Lambda(1670)1/2(-).
  • A significantly larger elasticity (x = 0.37+/-0.07) was determined compared to previous studies.
  • The obtained resonance parameters show strong agreement with theoretical predictions from the Koniuk and Isgur quark model.

Conclusions:

  • The updated analysis confirms the importance of the Lambda(1670)1/2(-) resonance.
  • The findings provide strong support for the Koniuk and Isgur quark model predictions.
  • This work refines our understanding of the K(-)p interaction near threshold.