$\gamma\gamma$ physics with the KLOE experiment

Archilli, F.; Patera, V.; Bulychjev, S.A.; Fiore, S.; Ranieri, A.; Nguyen, F.; Schioppa, M.; Badoni, D.; Martini, M.; Silarski, M.; Domenici, D.; Capon, G.; Di Donato, C.; Franzini, P.; Giovannella, S.; Sciascia, B.; Tortora, L.; Johansson, T.; Bocci, V.; Erriquez, O.; Höistad, B.; Di Domenico, A.; Gonnella, F.; Versaci, R.; De Lucia, E.; Bini, C.; Moricciani, D.; Ciambrone, P.; Felici, G.; Taccini, C.; Loddo, F.; Budano, A.; Branchini, P.; Babusci, D.; Kupsc, A.; Matsyuk, M.; Miscetti, S.; Sarra, I.; Czerwiński, E.; Morello, G.; Balwierz, I.; Passeri, A.; Graziani, E.; Venanzoni, G.; Prado Longhi, I.; Bossi, F.; Wolke, M.; Bencivenni, G.; Santangelo, P.; Happacher, F.; De Zorzi, G.; Kulikov, V.; Gauzzi, P.; Campana, P.; De Robertis, G.; Dané, E.; Wiślicki, W.; De Santis, A.; Jacewicz, M.; Lee-Franzini, J.; Martemianov, M.; Sciubba, A.; Moskal, P.; Messi, R.; Ceradini, F.; Zdebik, J.; Iarocci, E.; Fanizzi, G.; Bloise, C.

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Preprint
Report number	arXiv:1107.3782
Title	$\gamma\gamma$ physics with the KLOE experiment
Author(s)	Archilli, F. (Rome U., Tor Vergata ; INFN, Rome2) ; Babusci, D. (Frascati) ; Badoni, D. (Rome U., Tor Vergata ; INFN, Rome2) ; Balwierz, I. (Jagiellonian U.) ; Bencivenni, G. (Frascati) ; Bini, C. (Rome U. ; INFN, Rome) ; Bloise, C. (Frascati) ; Bocci, V. (INFN, Rome) ; Bossi, F. (Frascati) ; Branchini, P. (INFN, Rome3) ; Budano, A. (Rome III U. ; INFN, Rome3) ; Bulychjev, S.A. (Moscow, ITEP) ; Campana, P. (Frascati) ; Capon, G. (Frascati) ; Ceradini, F. (Rome III U. ; INFN, Rome3) ; Ciambrone, P. (Frascati) ; Czerwiński, E. (Frascati) ; Dané, E. (Frascati) ; De Lucia, E. (Frascati) ; De Robertis, G. (INFN, Bari) ; De Santis, A. (Rome U. ; INFN, Rome) ; De Zorzi, G. (Rome U. ; INFN, Rome) ; Di Domenico, A. (Rome U. ; INFN, Rome) ; Di Donato, C. (Naples U. ; INFN, Naples) ; Domenici, D. (Frascati) ; Erriquez, O. (Bari U. ; INFN, Bari) ; Fanizzi, G. (Bari U. ; INFN, Bari) ; Felici, G. (Frascati) ; Fiore, S. (Rome U. ; INFN, Rome) ; Franzini, P. (Rome U. ; INFN, Rome) ; Gauzzi, P. (Rome U. ; INFN, Rome) ; Giovannella, S. (Frascati) ; Gonnella, F. (Rome U., Tor Vergata ; INFN, Rome2) ; Graziani, E. (INFN, Rome3) ; Happacher, F. (Frascati) ; Höistad, B. (Uppsala U.) ; Iarocci, E. (Rome U., La Sapienza, Dip. di Energetica ; Frascati) ; Jacewicz, M. (Uppsala U.) ; Johansson, T. (Uppsala U.) ; Kulikov, V. (Moscow, ITEP) ; Kupsc, A. (Uppsala U.) ; Lee-Franzini, J. (Frascati ; SUNY, Stony Brook) ; Loddo, F. (INFN, Bari) ; Martemianov, M. (Moscow, ITEP) ; Martini, M. (Frascati ; Guglielmo Marconi U.) ; Matsyuk, M. (Moscow, ITEP) ; Messi, R. (Rome U., Tor Vergata ; INFN, Rome2) ; Miscetti, S. (Frascati) ; Morello, G. (Frascati) ; Moricciani, D. (INFN, Rome2) ; Moskal, P. (Jagiellonian U.) ; Nguyen, F. (Rome III U. ; INFN, Rome3) ; Passeri, A. (INFN, Rome3) ; Patera, V. (Rome U., La Sapienza, Dip. di Energetica ; Frascati) ; Prado Longhi, I. (Rome III U. ; INFN, Rome3) ; Ranieri, A. (INFN, Bari) ; Santangelo, P. (Frascati) ; Sarra, I. (Frascati) ; Schioppa, M. (Calabria U. ; INFN, Cosenza) ; Sciascia, B. (Frascati) ; Sciubba, A. (Rome U., La Sapienza, Dip. di Energetica ; Frascati) ; Silarski, M. (Jagiellonian U.) ; Taccini, C. (Rome III U. ; INFN, Rome3) ; Tortora, L. (INFN, Rome3) ; Venanzoni, G. (Frascati) ; Versaci, R. (Frascati ; CERN ; Gottingen U.) ; Wiślicki, W. (Jagiellonian U.) ; Wolke, M. (Uppsala U.) ; Zdebik, J. (Jagiellonian U.)
Publication	2011
Imprint	20 Jul 2011
Number of pages	6
Note	Comments: Contributed paper to the Lepton-Photon 2011 Conference Contributed paper to the Lepton-Photon 2011 Conference
Subject category	Particle Physics - Experiment
Abstract	The processes $e^+e^-\to e^+e^-X$, with $X$ being either the $\eta$ meson or $\pi^0\pi^0$, are studied at DA$\Phi$NE, with $e^+e^-$ beams colliding at $\sqrt{s}\simeq1$ GeV, below the $\phi$ resonance peak. The data sample is from an integrated luminosity of 240 pb$^{-1}$, collected by the KLOE experiment without tagging of the outgoing $e^+e^-$. Preliminary results are presented on the observation of the $\gamma\gamma\to\eta$ process, with both $\eta\to\pi^+\pi^-\pi^0$ and $\eta\to\pi^0\pi^0\pi^0$ channels, and the evidence for $\gamma\gamma\to\pi^0\pi^0$ production at low $\pi^0\pi^0$ invariant mass.
Other source	Inspire

$Left: fit of the $M_{miss}^2$ distribution for the $e^+e^-\to e^+e^-\eta$ analysis. Main contributions are: $e^+e^-\gamma$ (green) at negative $M_{miss}^2$ values due to the pion mass assigned to $e^+e^-$ tracks, $\eta\gamma$ (red), signal events (ligt blue). Right: fit of the recoil photon energy spectrum for the $e^+e^-\to\eta\gamma$ analysis. The $\eta\gamma$ peak (blue) and the $\omega\gamma$ peak (light blue) are visible; the broad distribution (green) is due to $\omega\pi^0$ events.$ $Left: fit of the $M_{miss}^2$ distribution for the $e^+e^-\to e^+e^-\eta$ analysis. Main contributions are: $e^+e^-\gamma$ (green) at negative $M_{miss}^2$ values due to the pion mass assigned to $e^+e^-$ tracks, $\eta\gamma$ (red), signal events (ligt blue). Right: fit of the recoil photon energy spectrum for the $e^+e^-\to\eta\gamma$ analysis. The $\eta\gamma$ peak (blue) and the $\omega\gamma$ peak (light blue) are visible; the broad distribution (green) is due to $\omega\pi^0$ events.$ $$\gamma\gamma\to\eta\to\pi^0\pi^0\pi^0$ analysis. Left: squared missing mass distributions for data (points whith error bars) and backgrounds (histograms) normalized according to the fit results. Colour code: red = $e^+e^-\to\eta\gamma$, light blue = signal, blue = $e^+e^-\to\omega\pi^0$. Right: preliminary KLOE value for $\sigma(e^+e^-\to\eta\gamma)$ at $\sqrt{s}=1\mbox{GeV}$ (red point), and SND results~\cite{ach} for several values of $\sqrt{s}$.$ Show more plots

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