Measurement of the radiative decay width \Gamma[\Lambda(1520) --> \Lambda \gamma] with the SPHINX spectrometer

A.F.Nilov; A.P.Kozhevnikov; A.S.Konstantinov; A.V.Artamonov; D.I.Patalakha; D.V.Vavilov; G.S.Lomkatsi; L.G.Landsberg; O.V.Eroshin; S.V.Golovkin

arxiv: hep-ex/0406039 · v2 · submitted 2004-06-15 · ✦ hep-ex

Measurement of the radiative decay width Gamma[Λ(1520) --> Λ γ] with the SPHINX spectrometer

Yu.M.Antipov , A.V.Artamonov , V.A.Batarin , D.V.Vavilov , V.A.Victorov , O.V.Eroshin , S.V.Golovkin , Yu.P.Gorin

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V.Z.Kolganov A.P.Kozhevnikov A.S.Konstantinov V.P.Kubarovsky V.F.Kurshetsov L.G.Landsberg V.M.Leontiev G.S.Lomkatsi V.V.Molchanov V.A.Mukhin A.F.Nilov D.I.Patalakha S.V.Petrenko V.T.Smolyankin

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keywords lambdagammadecayradiativespectrometersphinxstatsyst

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The radiative decay \Lambda(1520) --> \Lambda \gamma was measured directly in the study of exclusive diffractive-like reaction p + N --> \Lambda(1520) K^+ + N, \Lambda(1520) --> \Lambda \gamma with the SPHINX spectrometer. The values of the branching and partial width of this radiative decay were obtained: BR[\Lambda(1520) --> \Lambda \gamma] = (1.02+/-0.21(stat)+/-0.15(syst))x10^{-2} and \Gamma[\Lambda(1520) --> \Lambda \gamma] = 159+/-33(stat)+/-26(syst) keV.

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Radiative decays of the $\Lambda(1520)$ as a dynamically generated resonance
hep-ph 2026-05 unverdicted novelty 6.0

In the chiral unitary approach with dimensional regularization and new photon-baryon diagrams, the computed Lambda(1520) to gamma Sigma0 width matches BESIII data while the gamma Lambda width underpredicts the CLAS result.