Accès ouvert déclaré
2017
article
Measurement of the e [superscript +] e [superscript −] → π [superscript +] π [superscript −] π [superscript 0] π [superscript 0] cross section using initial-state radiation at BABAR
J. P. Lees, V. Poireau, V. Tisserand, E. Graugés, A. Palano, G. Eigen, D. N. Brown, Yu. G. Kolomensky, M. Fritsch, H. Koch, T. Vazquez Schroeder, C. Hearty, T. S. Mattison, J. A. McKenna, R. Y. So, V.E. Blinov, А. Р. Бузыкаев, В. П. Дружинин, V. B. Golubev, Е. А. Кравченко, А. П. Онучин, S. I. Serednyakov, Yu. I. Skovpen, E. P. Solodov, K. Yu. Todyshev, W. T. Ford, J. W. Gary, O. R. Long, A. M. Eisner, W. S. Lockman, J. G. Panduro Vazquez, D. S. Chao, C. H. Cheng, B. Echenard, K. T. Flood, D. G. Hitlin, J. Kim, T. S. Miyashita, P. Ongmongkolkul, F. C. Porter, M. Röhrken, Z. Huard, B. T. Meadows, B. G. Pushpawela, M. D. Sokoloff, L. Sun, J. Smith, S. R. Wagner, D. Bernard, M. Verderi, D. Bettoni, C. Bozzi, R. Calabrese, G. Cibinetto, E. Fioravanti, I. Garzia, E. Luppi, V. Santoro, A. Calcaterra, R. de Sangro, G. Finocchiaro, S. Martellotti, P. Patteri, I. M. Peruzzi, M. Piccolo, M. Rotondo, A. Zallo, S. Passaggio, C. Patrignani, H. M. Lacker, B. Bhuyan, U. Mallik, C. Chen, J. F. Cochran, S. Prell, H. Ahmed, A. V. Gritsan, N. Arnaud, M. Davier, F. Le Diberder, A.-M. Lutz, G. Wormser, D. J. Lange, D. M. Wright, J. P. Coleman, E. Gabathuler, D. Hutchcroft, D. J. Payne, C. Touramanis, A. J. Bevan, F. Di Lodovico, R. Sacco, G. Cowan, Sw. Banerjee, C. L. Davis, A. G. Denig, W. Gradl, K. Grießinger, A. Hafner, Klaus Schubert, R. J. Barlow, G. Lafferty, R. Cenci, A. Jawahery, Douglas A. Roberts, B. Dey, N. Néri, F. Palombo, R. Cheaib, L. Cremaldi, R. Godang, D. J. Summers, P. Taras, G. De Nardo, C. Sciacca, G. Raven, C. P. Jessop, J. M. LoSecco, K. Honscheid, Robert S. Kass, A. Gaz, M. Margoni, M. Posocco, G. Simi, F. Simonetto, R. Stroili, S. Akar, E. Ben-Haim, M. Bomben, G. R. Bonneaud, G. Calderini, J. Chauveau, G. Marchiori, J. Ocariz, M. Biasini, E. Manoni, A. Rossi, G. Batignani, S. Bettarini, M. Carpinelli, G. Casarosa, M. Chrząszcz, F. Forti, M. A. Giorgi, A. Lusiani, B. Oberhof, E. Paoloni, M. Rama, G. Rizzo, J. Walsh, A. Smith, F. Anulli, R. Faccini, F. Ferrarotto, F. Ferroni, A. Pilloni, G. Piredda, C. Bünger, S. Dittrich, O. Grünberg, M. Heß, T. Leddig, C. Voß, R. Waldi, T. Adye, F. F. Wilson, S. Emery, G. Vasseur, D. Aston, C. Cartaro, M. Convery, J. Dorfan, W. Dunwoodie, M. Ebert, R. C. Field, B. G. Fulsom, M. T. Graham, C. Hast, W. R. Innes, P. Kim, D. W. G. S. Leith, S. Luitz, D. B. MacFarlane, D. R. Muller, H. A. Neal, B. N. Ratcliff, A. Roodman, M. K. Sullivan, J. Va’vra, W. J. Wisniewski, M. V. Purohit, J. R. Wilson, A. Randle-Conde, S. J. Sekula, M. Bellis, P. R. Burchat, E. M. T. Puccio, M. S. Alam, J. Ernst, R. Gorodeisky, Newman Guttman, D. R. Peimer, A. Soffer, S. M. Spanier, J. L. Ritchie, R. F. Schwitters, J. M. Izen, X. C. Lou, F. Bianchi, F. De Mori, A. Filippi, D. Gamba, L. Lanceri, L. Vitale, F. Martínez-Vidal, A. Oyanguren, J. Albert, A. Beaulieu, F. U. Bernlochner, G. J. King, R. Kowalewski, T. Lueck, I. M. Nugent, J. M. Roney, R. Sobie, N. Tasneem, T. Gershon, P. F. Harrison, T. Latham, R. Prepost, S. L. Wu, R. Cowan
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Le résumé fourni par la source
The process e [superscript +] e [superscript -] →π [superscript +] π [superscript -] 2π [superscript 0] γ is investigated by means of the initial-state radiation technique, where a photon is emitted from the incoming electron or positron. Using 454.3 fb [superscript -1] of data collected around a center-of-mass energy of √s =10.58 GeV by the BABAR experiment at SLAC, approximately 150000 signal events are obtained. The corresponding nonradiative cross section is measured with a relative uncertainty of 3.6% in the energy region around 1.5 GeV, surpassing all existing measurements in precision. Using this new result, the channel’s contribution to the leading order hadronic vacuum polarization contribution to the anomalous magnetic moment of the muon is calculated as (g[subscript μ][superscript π[superscript +]π[superscript -]2π[superscript 0]]-2)/2=(17.9±0.1[subscript stat]±0.6[subscript syst])×10[superscript -10] in the energy range 0.85 GeV<E[subscript CM]<1.8 GeV. In the same energy range, the impact on the running of the fine-structure constant at the Z[superscript 0]-pole is determined as Δα[superscript π[superscript +]π[superscript -]2π[superscript 0]]M[subscript Z][superscript 2])=(4.44±0.02[subscript stat]±0.14[subscript syst])×10[superscript -4]. Furthermore, intermediate resonances are studied and especially the cross section of the process e[superscript +]e[superscript -]→ωπ[superscript 0]→π[superscript +]π[superscript -]2π[superscript 0] is measured.
Ce résumé expose les affirmations des auteurs. BNTIC ne l’interprète pas comme une validation indépendante des résultats.
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Les sujets associés
Particle Accelerators and Free-Electron LasersParticle Detector Development and PerformanceParticle physics theoretical and experimental studies