4 November 1999 Ž . Physics Letters B 466 1999 392–402 ž / q y a 1260 p dominance in the process ee ™ 4p 1 at energies 1.05–1.38 GeV R.R. Akhmetshin a , E.V. Anashkin a , M. Arpagaus a , V.M. Aulchenko a,b , V.Sh. Banzarov a , L.M. Barkov a,b , N.S. Bashtovoy a , A.E. Bondar a,b , D.V. Bondarev a , A.V. Bragin a , D.V. Chernyak a , A.G. Chertovskikh a , A.S. Dvoretsky a,b , S.I. Eidelman a,b , G.V. Fedotovitch a,b , N.I. Gabyshev a , A.A. Grebeniuk a , D.N. Grigoriev a , P.M. Ivanov a , S.V. Karpov a , V.F. Kazanin a,b , B.I. Khazin a , I.A. Koop a , M.S. Korostelev a , P.P. Krokovny a,b , L.M. Kurdadze a,b , A.S. Kuzmin a,b , I.B. Logashenko a , P.A. Lukin a , A.P. Lysenko a , K.Yu. Mikhailov a,b , A.I. Milstein a,b , I.N. Nesterenko a , V.S. Okhapkin a , A.V. Otboev a , E.A. Perevedentsev a,b , A.A. Polunin a , A.S. Popov a,b , T.A. Purlatz a,b , N.I. Root a,b , A.A. Ruban a , N.M. Ryskulov a , A.G. Shamov a , Yu.M. Shatunov a , A.I. Shekhtman a , B.A. Shwartz a,b , A.L. Sibidanov a,b , V.A. Sidorov a , A.N. Skrinsky a , V.P. Smakhtin a , I.G. Snopkov a , E.P. Solodov a,b , P.Yu. Stepanov a , A.I. Sukhanov a , V.M. Titov a , A.A. Valishev a , Yu.V. Yudin a , S.G. Zverev a , J.A. Thompson c , V.W. Hughes d a Budker Institute of Nuclear Physics, NoÕosibirsk 630090, Russia b NoÕosibirsk State UniÕersity, NoÕosibirsk 630090, Russia c UniÕersity of Pittsburgh, Pittsburgh, PA 15260, USA d Yale UniÕersity, New HaÕen, CT 06511, USA Received 18 August 1999; received in revised form 13 September 1999; accepted 14 September 1999 Editor: L. Montanet Abstract The 5.8 pb y1 of data collected by the CMD-2 Collaboration in the energy range 1.05–1.38 GeV have been used to study energy dependence of the processes e q e y ™p q p y 2p 0 and e q e y ™2p q 2p y . Analysis of the differential distributions Ž . demonstrates the dominance of the a 1260 p and vp intermediate states. Upper limits for the contributions of other 1 possible states are also obtained. q 1999 Published by Elsevier Science B.V. All rights reserved. 0370-2693r99r$ - see front matter q 1999 Published by Elsevier Science B.V. All rights reserved. Ž . PII: S0370-2693 99 01080-1