We present a measurement of η meson production in photon-photon interactions produced by electron-positron beams colliding with s√=1 GeV. The measurement is done with the KLOE detector at the ϕ-factory DAΦNE with an integrated luminosity of 0.24 fb−1. The e + e − → e + e − η cross section is measured without detecting the out-going electron and positron, selecting the decays η → π + π − π 0 and η → π 0 π 0 π 0. The most relevant background is due to e + e − → ηγ when the monochromatic photon escapes detection. The cross section for this process is measured as σ(e + e − → ηγ) = (856 ± 8stat ± 16syst) pb. The combined result for the e + e − → e + e − η cross section is σ(e + e − → e + e − η) = (32.72 ± 1.27stat ± 0.70syst) pb. From this we derive the partial width Γ(η → γγ) = (520 ± 20stat ± 13syst) eV. This is in agreement with the world average and is the most precise measurement to date.

Babusci, D., Badoni, D., Balwierz-Pytko, I., Bencivenni, G., Bini, C., Bloise, C., et al. (2013). Measurement of η meson production in γγ interactions and Γ(η → γγ) with the KLOE detector. JOURNAL OF HIGH ENERGY PHYSICS(1) [10.1007/JHEP01(2013)119].

Measurement of η meson production in γγ interactions and Γ(η → γγ) with the KLOE detector

Fantini, A.;Loffredo, S.;Martini, M.;Mascolo, M.;Messi, R.;Sarra, I.;Tortora, L.;
2013-01-17

Abstract

We present a measurement of η meson production in photon-photon interactions produced by electron-positron beams colliding with s√=1 GeV. The measurement is done with the KLOE detector at the ϕ-factory DAΦNE with an integrated luminosity of 0.24 fb−1. The e + e − → e + e − η cross section is measured without detecting the out-going electron and positron, selecting the decays η → π + π − π 0 and η → π 0 π 0 π 0. The most relevant background is due to e + e − → ηγ when the monochromatic photon escapes detection. The cross section for this process is measured as σ(e + e − → ηγ) = (856 ± 8stat ± 16syst) pb. The combined result for the e + e − → e + e − η cross section is σ(e + e − → e + e − η) = (32.72 ± 1.27stat ± 0.70syst) pb. From this we derive the partial width Γ(η → γγ) = (520 ± 20stat ± 13syst) eV. This is in agreement with the world average and is the most precise measurement to date.
17-gen-2013
Pubblicato
Rilevanza internazionale
Articolo
Sì, ma tipo non specificato
Settore FIS/01 - FISICA SPERIMENTALE
English
Babusci, D., Badoni, D., Balwierz-Pytko, I., Bencivenni, G., Bini, C., Bloise, C., et al. (2013). Measurement of η meson production in γγ interactions and Γ(η → γγ) with the KLOE detector. JOURNAL OF HIGH ENERGY PHYSICS(1) [10.1007/JHEP01(2013)119].
Babusci, D; Badoni, D; Balwierz-Pytko, I; Bencivenni, G; Bini, C; Bloise, C; Bossi, F; Branchini, P; Budano, A; Caldeira Balkeståhl, L; Capon, G; Ceradini, F; Ciambrone, P; Czerwinski, E; Danè, E; De Lucia, E; De Robertis, G; De Santis, A; Di Domenico, A; Di Donato, C; Di Salvo, R; Domenici, D; Erriquez, O; Fanizzi, G; Fantini, A; Felici, G; Fiore, S; Franzini, P; Gauzzi, P; Giardina, G; Giovannella, S; Gonnella, F; Graziani, E; Happacher, F; Heijkenskjöld, L; Höistad, B; Iafolla, L; Jacewicz, M; Johansson, T; Kupsc, A; Lee-Franzini, J; Leverington, B; Loddo, F; Loffredo, S; Mandaglio, G; Martemianov, M; Martini, M; Mascolo, M; Messi, R; Miscetti, S; Morello, G; Moricciani, D; Moskal, P; Nguyen, F; Passeri, A; Patera, V; Prado Longhi, I; Ranieri, A; Redmer, Cf; Santangelo, P; Sarra, I; Schioppa, M; Sciascia, B; Silarski, M; Taccini, C; Tortora, L; Venanzoni, G; Wislicki, W; Wolke, M; Zdebik, J
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2108/276291
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