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000866012 0247_ $$2doi$$a10.1103/PhysRevLett.123.182301
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000866012 1001_ $$00000-0001-7713-7011$$aIreland, D. G.$$b0$$eCorresponding author
000866012 245__ $$aKaon Photoproduction and the Λ Decay Parameter α −
000866012 260__ $$aCollege Park, Md.$$bAPS$$c2019
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000866012 520__ $$aThe weak decay parameter α− of the Λ is an important quantity for the extraction of polarization observables in various experiments. Moreover, in combination with α+ from ¯Λ decay it provides a measure for matter-antimatter asymmetry. The weak decay parameter also affects the decay parameters of the Ξ and Ω baryons and, in general, any quantity in which the polarization of the Λ is relevant. The recently reported value by the BESIII Collaboration of 0.750(9)(4) is significantly larger than the previous PDG value of 0.642(13) that had been accepted and used for over 40 years. In this work we make an independent estimate of α−, using an extensive set of polarization data measured in kaon photoproduction in the baryon resonance region and constraints set by spin algebra. The obtained value is 0.721(6)(5). The result is corroborated by multiple statistical tests as well as a modern phenomenological model, showing that our new value yields the best description of the data in question. Our analysis supports the new BESIII finding that α− is significantly larger than the previous PDG value. Any experimental quantity relying on the value of α− should therefore be reconsidered.
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000866012 536__ $$0G:(DE-Juel1)jikp07_20110501$$aUnified analysis of photon- and pion-induced reactions in the hadron exchange picture (jikp07_20110501)$$cjikp07_20110501$$fUnified analysis of photon- and pion-induced reactions in the hadron exchange picture$$x2
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000866012 7001_ $$0P:(DE-Juel1)131137$$aDöring, M.$$b1
000866012 7001_ $$0P:(DE-HGF)0$$aGlazier, D. I.$$b2
000866012 7001_ $$0P:(DE-Juel1)131179$$aHaidenbauer, J.$$b3
000866012 7001_ $$0P:(DE-HGF)0$$aMai, M.$$b4
000866012 7001_ $$0P:(DE-HGF)0$$aMurray-Smith, R.$$b5
000866012 7001_ $$0P:(DE-Juel1)128546$$aRönchen, D.$$b6
000866012 773__ $$0PERI:(DE-600)1472655-5$$a10.1103/PhysRevLett.123.182301$$gVol. 123, no. 18, p. 182301$$n18$$p182301$$tPhysical review letters$$v123$$x1079-7114$$y2019
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