Study of the process e + e − → π + π − π 0 using initial state radiation with BABAR

The process e+e- → π+π-π0γ is studied at a center-of-mass energy near the ϒ ( 4S ) resonance using a data sample of 469 fb-1 collected with the BABAR detector at the PEP-II collider. We have performed a precise measurement of the e+e- → π+π-π0 cross section in the center-of-mass energy range from 0...

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Veröffentlicht in:	Physical review. D 2021-12, Vol.104 (11), Article 112003
Hauptverfasser:	Lees, J. P., Poireau, V., Tisserand, V., Grauges, E., Palano, A., Eigen, G., Brown, D. N., Kolomensky, Yu. G., Fritsch, M., Koch, H., Schroeder, T., Cheaib, R., Hearty, C., Mattison, T. S., McKenna, J. A., So, R. Y., Blinov, V. E., Buzykaev, A. R., Druzhinin, V. P., Golubev, V. B., Kozyrev, E. A., Kravchenko, E. A., Onuchin, A. P., Serednyakov, S. I., Skovpen, Yu. I., Solodov, E. P., Todyshev, K. Yu, Lankford, A. J., Dey, B., Gary, J. W., Long, O., Eisner, A. M., Lockman, W. S., Panduro Vazquez, W., Chao, D. S., Cheng, C. H., Echenard, B., Flood, K. T., Hitlin, D. G., Kim, J., Li, Y., Lin, D. X., Middleton, S., Miyashita, T. S., Ongmongkolkul, P., Oyang, J., Porter, F. C., Röhrken, M., Huard, Z., Meadows, B. T., Pushpawela, B. G., Sokoloff, M. D., Sun, L., Smith, J. G., Wagner, S. R., Bernard, D., Verderi, M., Bettoni, D., Bozzi, C., Calabrese, R., Cibinetto, G., Fioravanti, E., Garzia, I., Luppi, E., Santoro, V., Calcaterra, A., de Sangro, R., Finocchiaro, G., Martellotti, S., Patteri, P., Peruzzi, I. M., Piccolo, M., Rotondo, M., Zallo, A., Passaggio, S., Patrignani, C., Shuve, B. J., Lacker, H. M., Bhuyan, B., Mallik, U., Chen, C., Cochran, J., Prell, S., Gritsan, A. V., Arnaud, N., Davier, M., Le Diberder, F., Lutz, A. M., Wormser, G., Lange, D. J., Wright, D. M., Coleman, J. P., Gabathuler, E., Hutchcroft, D. E., Payne, D. J., Touramanis, C., Bevan, A. J., Di Lodovico, F., Sacco, R., Cowan, G.
Format:	Artikel
Sprache:	eng
Schlagworte:	High Energy Physics - Experiment Physics
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Zusammenfassung:	The process e+e- → π+π-π0γ is studied at a center-of-mass energy near the ϒ ( 4S ) resonance using a data sample of 469 fb-1 collected with the BABAR detector at the PEP-II collider. We have performed a precise measurement of the e+e- → π+π-π0 cross section in the center-of-mass energy range from 0.62 to 3.5 GeV. In the energy regions of the ω and ϕ resonances, the cross section is measured with a systematic uncertainty of 1.3%. The leading-order hadronic contribution to the muon magnetic anomaly calculated using the measured e+e- → π+π-π0 cross section from threshold to 2.0 GeV is ( 45.86±0.14±0.58 ) ×10-10 . From the fit to the measured 3π mass spectrum we have determined the resonance parameters Γ ( ω → e+e- ) B ( ω → π+π-π0 ) = ( 0.5698±0.0031±0.0082 ) keV , Γ ( ϕ → e+e- ) B ( ϕ → π+π-π0 ) = ( 0.1841±0.0021±0.0080 ) keV , and B ( ρ → 3π ) = ( 0.88±0.23±0.30 ) ×10-4 . The significance of the ρ → 3π signal is greater than 6σ . For the J / ψ resonance we have measured the product Γ ( J / ψ → e+e- ) B ( J / ψ → 3π ) = ( 0.1248±0.0019±0.0026 ) keV .
ISSN:	2470-0010 2470-0029
DOI:	10.1103/PhysRevD.104.112003