Light resonances in K

I. Iashvili,L. Jonesc,P. D. Jongb, I. Josa-Mutuberríax,R. A. Khanr,M. Kaurr,M. N. Kienzle-Focaccis,J. K. Kimao, J. Kirkbyq, D. Kissm,W. Kittel,A. Klimentovn, A. C. Königac, M. Kopalar, A. Koppat,V. Koutsenkon,M. Kräberau, R. W. Kraemeraf,W. Krenza,A. Krügerat,A. Kuninn,P. L. D. Guevarax,I. Laktinehw,G. Landip,M. Lebeauq,A. Lebedevn,P. Lebrunw,P. Lecomteau,P. Lecoqq,P. L. Coultreau,H. Leeh,J. M. L. Goffq, R. Leisteat, P. Levtchenkoai,S. Likhodedat, C. H. Linaw,F. L. Lindeb, L. Listaaa,W. Lohmannat, E. Longoah,K. Lübelsmeyera, C. Luciq, L. Lugnierw, L. Luminariah,W. Lustermannau, W. Mat,M. Maity,L. Malgeriq,A. Malinin, D. Mangeolac, J. Mansag, G. Mariano,J. P. Martinw, F. Marzanoah,K. Mazumdarj,R. R. McNeilf, S. Meleq, L. Merolaaa, W. Metzgerac,A. Mihul,J. Mnicha,T. Moulik,G. S. Muanzaw, S. Paolettiah, Z. Szillasiap, T. Sztaricskaiap

semanticscholar（2017）

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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. L3 Collaboration, ACHARD, Pablo (Collab.), et al. Light resonances in K

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