Kaon Photoproduction and the Λ Decay Parameter α–

doi:10.1103/PhysRevLett.123.182301

This content will become publicly available on October 28, 2020

Title: Kaon Photoproduction and the $Λ$ Decay Parameter $α_{-}$

Abstract

The weak decay parameter $$\alpha_-$$ of the $$\Lambda$$ is an important quantity for the extraction of polarization observables in various experiments. Moreover, in combination with $$\alpha_+$$ from $$\bar\Lambda$$ decay it provides a measure for matter-antimatter asymmetry. The weak decay parameter also affects the decay parameters of the $$\Xi$$ and $$\Omega$$ baryons and, in general, any quantity in which the polarization of the $$\Lambda$$ is relevant. The recently reported value by the BESIII collaboration of $0.750(9)(4)$ is significantly larger than the previous PDG value of $0.642(13)$ that had been accepted and used for over 40 years. In this work we make an independent estimate of $$\alpha_-$$, using an extensive set of polarization data measured in kaon photoproduction in the baryon resonance region and constraints set by spin algebra. The obtained value is 0.721(6)(5). The result is corroborated by multiple statistical tests as well as a modern phenomenological model, showing that our new value yields the best description of the data in question. Furthermore, our analysis supports the new BESIII finding that $$\alpha_-$$ is significantly larger than the previous PDG value. Any experimental quantity relying on the value of $$\alpha_-$$ should therefore be re-considered.

Authors:

^[1]; Döring, M. ^[2]; Glazier, Derek I. ^[1]; Haidenbauer, J. ^[3]; Mai, M. ^[4]; Murray-Smith, Roderick ^[1]; Rönchen, D. ^[5]

Univ. of Glasgow, Glasgow (United Kingdom)
The George Washington Univ., Washington, D.C. (United States); Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
Forschungszentrum Jülich, Julich (Germany)
The George Washington Univ., Washington, D.C. (United States)
Univ. Bonn, Bonn (Germany)

Publication Date:: 2019-10-28

Research Org.:: Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)

Sponsoring Org.:: USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26)

OSTI Identifier:: 1572152

Report Number(s):: JLAB-THY-19-3019; DOE/OR/23177-4767; arXiv:1904.07616
Journal ID: ISSN 0031-9007; PRLTAO

Grant/Contract Number:: ST/P004458/1; PHY-1452055; AC05-06OR23177; SC0016582; TRR110; 11621131001; EP/M01326X/1; EP/R018634/1

Resource Type:: Accepted Manuscript

Journal Name:: Physical Review Letters

Additional Journal Information:: Journal Volume: 123; Journal Issue: 18; Journal ID: ISSN 0031-9007

Publisher:: American Physical Society (APS)

Country of Publication:: United States

Language:: English

Subject:: 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS

Citation Formats


                    Ireland, David G., Döring, M., Glazier, Derek I., Haidenbauer, J., Mai, M., Murray-Smith, Roderick, and Rönchen, D. Kaon Photoproduction and the Λ Decay Parameter α–.  United States: N. p., 2019. 
        Web.  doi:10.1103/PhysRevLett.123.182301.

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                    Ireland, David G., Döring, M., Glazier, Derek I., Haidenbauer, J., Mai, M., Murray-Smith, Roderick, & Rönchen, D. Kaon Photoproduction and the Λ Decay Parameter α–.  United States.  doi:10.1103/PhysRevLett.123.182301.

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                    Ireland, David G., Döring, M., Glazier, Derek I., Haidenbauer, J., Mai, M., Murray-Smith, Roderick, and Rönchen, D. Mon .  
        "Kaon Photoproduction and the Λ Decay Parameter α–".  United States.  doi:10.1103/PhysRevLett.123.182301.

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@article{osti_1572152,

  title        = {Kaon Photoproduction and the Λ Decay Parameter α–},

  author       = {Ireland, David G. and Döring, M. and Glazier, Derek I. and Haidenbauer, J. and Mai, M. and Murray-Smith, Roderick and Rönchen, D.},

  abstractNote = {The weak decay parameter $\alpha_-$ of the $\Lambda$ is an important quantity for the extraction of polarization observables in various experiments. Moreover, in combination with $\alpha_+$ from $\bar\Lambda$ decay it provides a measure for matter-antimatter asymmetry. The weak decay parameter also affects the decay parameters of the $\Xi$ and $\Omega$ baryons and, in general, any quantity in which the polarization of the $\Lambda$ is relevant. The recently reported value by the BESIII collaboration of $0.750(9)(4)$ is significantly larger than the previous PDG value of $0.642(13)$ that had been accepted and used for over 40 years. In this work we make an independent estimate of $\alpha_-$, using an extensive set of polarization data measured in kaon photoproduction in the baryon resonance region and constraints set by spin algebra. The obtained value is 0.721(6)(5). The result is corroborated by multiple statistical tests as well as a modern phenomenological model, showing that our new value yields the best description of the data in question. Furthermore, our analysis supports the new BESIII finding that $\alpha_-$ is significantly larger than the previous PDG value. Any experimental quantity relying on the value of $\alpha_-$ should therefore be re-considered.},

  doi          = {10.1103/PhysRevLett.123.182301},

  journal      = {Physical Review Letters},

  number       = 18,

  volume       = 123,

  place        = {United States},

  year         = {2019},

  month        = {10}

}

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This content will become publicly available on October 28, 2020

Title: Kaon Photoproduction and the Λ Decay Parameter α –

Abstract

Citation Formats

Partial-wave analysis of γ p → K + Λ using a multichannel framework journal, May 2019

JURECA: Modular supercomputer at Jülich Supercomputing Centre journal, January 2018

Beam-recoil polarization transfer in the nucleon resonance region in the exclusive e → p → e ' K + Λ → and e → p → e ' K + Σ → 0 reactions at the CLAS spectrometer journal, June 2009

Strong Evidence for Nucleon Resonances near 1900 MeV journal, August 2017

The impact of $K^{+}\Lambda$ K + Λ photoproduction on the resonance spectrum journal, June 2018

Coupled-channel analysis of K Σ production on the nucleon up to 2.0 GeV journal, November 2013

Antinucleon–nucleon interaction at low energy: scattering and protonium journal, September 2002

Isospin decomposition of γ N → N * transitions within a dynamical coupled-channels model journal, July 2016

Erratum to: Photocouplings at the pole from pion photoproduction journal, May 2015

Production and Decay of Cascade Hyperons journal, March 1969

Completeness rules for spin observables in pseudoscalar meson photoproduction journal, April 1997

First measurement of Ξ− polarization in photoproduction journal, August 2018

Violation of CP in variance, C asymmetry, and baryon asymmetry of the universe journal, May 1991

Bayesian Inference of the Resonance Content of p ( γ , K + ) Λ journal, May 2012

Photocouplings at the pole from pion photoproduction journal, June 2014

First measurement of beam-recoil observables C x and C z in hyperon photoproduction journal, March 2007

Differential cross section and recoil polarization measurements for the γ p → K + Λ reaction using CLAS at Jefferson Lab journal, February 2010

Photoproduction of Λ and Σ 0 hyperons using linearly polarized photons journal, June 2016

On the validity of chiral perturbation theory for weak hyperon decays journal, January 1985

Partial-Wave Analysis of K − p → Ξ − K + at 2 GeV c journal, June 1967

emcee : The MCMC Hammer journal, March 2013

Eta photoproduction in a combined analysis of pion- and photon-induced reactions journal, June 2015

A measurement of the β-parameter in the charged nonleptonic decay of the Λ0 hyperon journal, January 1972

Review of Particle Physics journal, August 2018

Fitting parton distribution data with multiplicative normalization uncertainties journal, May 2010

Electromagnetic production of kaons from protons, and baryon electromagnetic form factors journal, March 2012

Weak and Electromagnetic Interactions of Hyperons: a Chiral Approach journal, October 2000

Determining pseudoscalar meson photoproduction amplitudes from complete experiments journal, April 2011

Measurement of the differential cross section and the spin-correlation parameters P, A and R in the backward peak of π−p→K0Λ at 5 GeV/c journal, November 1975

On the use of the covariance matrix to fit correlated data journal, July 1994

First Measurement of Transferred Polarization in the Exclusive e → p → e ′ K + Λ → Reaction journal, April 2003

Measurement of the transverse polarization of Λ and Λ ¯ hyperons produced in proton-proton collisions at s = 7 TeV using the ATLAS detector journal, February 2015

Final state interactions in nonleptonic hyperon decays journal, June 2003

Violation of <i>CP</i> in variance, <i>C</i> asymmetry, and baryon asymmetry of the universe [Нарушение CP-инвариантности. C-асимметрия и барионная асимметрия Вселенной] journal, January 1991

Coupled-channel dynamics in the reactions πN → πN, ηN, KΛ, KΣ journal, April 2013

Title: Kaon Photoproduction and the $Λ$ Decay Parameter $α_{-}$

Partial-wave analysis of $γ p \to K^{+} Λ$ using a multichannel framework
journal, May 2019

JURECA: Modular supercomputer at Jülich Supercomputing Centre
journal, January 2018

Beam-recoil polarization transfer in the nucleon resonance region in the exclusive $\vec{e} p \to e^{'} K^{+} \vec{Λ}$ and $\vec{e} p \to e^{'} K^{+} {\vec{Σ}}^{0}$ reactions at the CLAS spectrometer
journal, June 2009

Strong Evidence for Nucleon Resonances near 1900 MeV
journal, August 2017

The impact of $K^{+}\Lambda$ K + Λ photoproduction on the resonance spectrum
journal, June 2018

Coupled-channel analysis of $K Σ$ production on the nucleon up to 2.0 GeV
journal, November 2013

Antinucleon–nucleon interaction at low energy: scattering and protonium
journal, September 2002

Isospin decomposition of $γ N \to N^{*}$ transitions within a dynamical coupled-channels model
journal, July 2016

Erratum to: Photocouplings at the pole from pion photoproduction
journal, May 2015

Production and Decay of Cascade Hyperons
journal, March 1969

Completeness rules for spin observables in pseudoscalar meson photoproduction
journal, April 1997

First measurement of Ξ− polarization in photoproduction
journal, August 2018

Violation of CP in variance, C asymmetry, and baryon asymmetry of the universe
journal, May 1991

Bayesian Inference of the Resonance Content of $p (γ, K^{+}) Λ$
journal, May 2012

Photocouplings at the pole from pion photoproduction
journal, June 2014

First measurement of beam-recoil observables $C_{x}$ and $C_{z}$ in hyperon photoproduction
journal, March 2007

Differential cross section and recoil polarization measurements for the $γ p \to K^{+} Λ$ reaction using CLAS at Jefferson Lab
journal, February 2010

Photoproduction of $Λ$ and $Σ^{0}$ hyperons using linearly polarized photons
journal, June 2016

On the validity of chiral perturbation theory for weak hyperon decays
journal, January 1985

Partial-Wave Analysis of $K^{-} p \to Ξ^{-} K^{+}$ at $2 \frac{GeV}{c}$
journal, June 1967

`emcee` : The MCMC Hammer
journal, March 2013

Eta photoproduction in a combined analysis of pion- and photon-induced reactions
journal, June 2015

A measurement of the β-parameter in the charged nonleptonic decay of the Λ0 hyperon
journal, January 1972

Review of Particle Physics
journal, August 2018

Fitting parton distribution data with multiplicative normalization uncertainties
journal, May 2010

Electromagnetic production of kaons from protons, and baryon electromagnetic form factors
journal, March 2012

Weak and Electromagnetic Interactions of Hyperons: a Chiral Approach
journal, October 2000

Determining pseudoscalar meson photoproduction amplitudes from complete experiments
journal, April 2011

Measurement of the differential cross section and the spin-correlation parameters P, A and R in the backward peak of π−p→K0Λ at 5 GeV/c
journal, November 1975

On the use of the covariance matrix to fit correlated data
journal, July 1994

First Measurement of Transferred Polarization in the Exclusive $\vec{e} p \to e^{'} K^{+} \vec{Λ}$ Reaction
journal, April 2003

Measurement of the transverse polarization of $Λ$ and $\bar{Λ}$ hyperons produced in proton-proton collisions at $\sqrt{s} = 7 TeV$ using the ATLAS detector
journal, February 2015

Final state interactions in nonleptonic hyperon decays
journal, June 2003

Violation of <i>CP</i> in variance, <i>C</i> asymmetry, and baryon asymmetry of the universe [Нарушение CP-инвариантности. C-асимметрия и барионная асимметрия Вселенной]
journal, January 1991

Coupled-channel dynamics in the reactions πN → πN, ηN, KΛ, KΣ
journal, April 2013