Measurement of the Σ− charge radius by Σ−–electron elastic scattering

• Published in: Physics letters. B Vol. 522; no. 3-4; pp. 233 - 239
• Main Authors: Eschrich, I, Krüger, H, Simon, J, Vorwalter, K, Alkhazov, G, Atamantchouk, A.G, Balatz, M.Y, Bondar, N.F, Cooper, P.S, Dauwe, L.J, Davidenko, G.V, Dersch, U, Dirkes, G, Dolgolenko, A.G, Dzyubenko, G.B, Edelstein, R, Emediato, L, Endler, A.M.F, Engelfried, J, Escobar, C.O, Filimonov, I.S, Garcia, F.G, Gaspero, M, Giller, I, Golovtsov, V.L, Gouffon, P, Gülmez, E, He, Kangling, Jun, S.Y, Kaya, M, Kilmer, J, Kim, V.T, Kochenda, L.M, Königsmann, K, Konorov, I, Kozhevnikov, A.P, Krivshich, A.G, Kubantsev, M.A, Kubarovsky, V.P, Kulyavtsev, A.I, Kuropatkin, N.P, Kurshetsov, V.F, Kwan, S, Lamberto, A, Landsberg, L.G, Leikin, E.M, Li, Yunshan, Luksys, M, Lungov, T, Maleev, V.P, Mao, D, Mao, Chensheng, Mao, Zhenlin, Masciocchi, S, Mattson, M, Matveev, V, McCliment, E, Moinester, M.A, Molchanov, V.V, Morelos, A, Nelson, K.D, Nemitkin, A.V, Neoustroev, P.V, Newsom, C, Nurushev, S.B, Onel, Y, Ozel, E, Ozkorucuklu, S, Penzo, A, Petrenko, S.V, Pogodin, P, Povh, B, Prutskoi, V.A, Ramberg, E, Rappazzo, G.F, Razmyslovich, B.V, Rud, V.I, Russ, J, Scheglov, Y, Schiavon, P, Skow, D, Smith, V.J, Srivastava, M, Steiner, V, Stepanov, V, Stutte, L, Svoiski, M, Terentyev, N.K, Thomas, G.P, Uvarov, L.N, Vasiliev, A.N, Vavilov, D.V, Verebryusov, V.S, Victorov, V.A, Vishnyakov, V.E, Vorobyov, A.A, You, J, Zhao, Wenheng, Zheng, Shuchen, Zukanovich-Funchal, R
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 13.12.2001
• Subjects: Elastic scattering; Electromagnetic form factors; Electron–Σ− elastic scattering; Hadron strong and electromagnetic radii; Hadron-induced elastic scattering at high energy; Hyperons; Σ− charge radius; Σ− form factor; Hyperons; Σ− form factor; Hadron strong and electromagnetic radii; 13.40.Gp; Elastic scattering; Electron–Σ− elastic scattering; Σ− charge radius; 13.60.Fz; Hadron-induced elastic scattering at high energy; 14.20.Jn; 13.85.Dz; Electromagnetic form factors
• ISSN: 0370-2693; 1873-2445
• DOI: 10.1016/S0370-2693(01)01285-0

The Σ− mean squared charge radius has been measured in the space-like Q2 range 0.035–0.105 GeV2/c2 by elastic scattering of a Σ− beam off atomic electrons. The measurement was performed with the SELEX (E781) spectrometer using the Fermilab hyperon beam at a mean energy of 610 GeV/c. We obtain 〈r2ch〉Σ−=(0.61±0.12(stat.)±0.09(syst.)) fm2. The proton and π− charge radii were measured as well and are consistent with results of other experiments. Our result agrees with the recently measured strong interaction radius of the Σ−.