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Light resonances in KS0K±π and ηπ+π final states in γγ collisions at LEP

CollaborationWith : Achard, Pablo / Ambrosi, Giovanni / Bourquin, Maurice / Braccini, Saverio / Chamizo Llatas, Maria / Deglon, Patrick / Delmeire, Evelyne / Extermann, Pierre / Field, John / Kienzle, Maria-Novella / Pohl, Martin
Published in Physics Letters. B. 2001, vol. 501, no. 1-2, p. 1-11
Abstract The e+e−→e+e−KS0K±π∓ and e+e−→e+e−ηπ+π− final states are studied with the L3 detector at LEP using data collected at centre-of-mass energies from 183 GeV up to 202 GeV. The mass spectrum of the K0SK±π∓ final state shows an enhancement around 1470 MeV, which is identified with the pseudoscalar meson η(1440). This state is observed in γγ collisions for the first time and its two-photon width is measured to be Γγγ(η(1440))xBR(η(1440) →KKπ)=212±50 (stat)±23 (sys.) eV. Clear evidence is also obtained for the formation of the axial vector mesons f1(1420) and f1(1285). In the ηπ+π− channel the f1(1285) is observed, and upper limits for the formation of η(1440) and η(1295) are obtained.
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L3 COLLABORATION. Light resonances in KS0K±π and ηπ+π final states in γγ collisions at LEP. In: Physics Letters. B, 2001, vol. 501, n° 1-2, p. 1-11. doi: 10.1016/S0370-2693(01)00102-2 https://archive-ouverte.unige.ch/unige:44038

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Deposited on : 2014-12-19

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