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26 April 2024 |
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Kaon Photoproduction and the $Lambda$ Decay Parameter $alpha_-$ | | D. G. Ireland
; M. Döring
; D. I. Glazier
; J. Haidenbauer
; M. Mai
; R. Murray-Smith
; D. Rönchen
; | | Date: |
16 Apr 2019 | | 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 $arLambda$ decay it provides a
measure for the 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 current PDG value of $0.642(13)$. 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. 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. | | Source: | arXiv, 1904.7616 | | Services: | Forum | Review | PDF | Favorites | |
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