Evidence for the onset of color transparency in ρ0 electroproduction off nuclei

We have measured the nuclear transparency of the incoherent diffractive A(e,e′ρ0) process in 12C and 56Fe targets relative to 2H using a 5 GeV electron beam. The nuclear transparency, the ratio of the produced ρ0ʼs on a nucleus relative to deuterium, which is sensitive to ρA interaction, was studied...

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Veröffentlicht in:	Physics letters. B 2012-06, Vol.712 (4-5), p.326-330
Hauptverfasser:	El Fassi, L., Zana, L., Hakobyan, H., Zheng, X., Adikaram, D., Aghasyan, M., Anghinolfi, M., Arrington, J., Avakian, H., Baghdasaryan, H., Battaglieri, M., Bedlinskiy, I., Branford, D., Briscoe, W.J., Bültmann, S., Celentano, A., Chandavar, S., Contalbrigo, M., Crede, V., DʼAngelo, A., Daniel, A., De Vita, R., Deur, A., Dey, B., Djalali, C., Dodge, G.E., Doughty, D., Dupre, R., Egiyan, H., El Alaoui, A., Eugenio, P., Fegan, S., Gevorgyan, N., Gilfoyle, G.P., Giovanetti, K.L., Girod, F.X., Goetz, J.T., Golovatch, E., Guidal, M., Hanretty, C., Heddle, D., Hicks, K., Ilieva, Y., Ishkhanov, B.S., Isupov, E.L., Jawalkar, S.S., Keller, D., Khetarpal, P., Kim, A., Klein, A., Klein, F.J., Kuleshov, S.V., Kuznetsov, V., Laget, J.M., MacGregor, I.J.D., Mao, Y., Markov, N., Mayer, M., McKinnon, B., Mineeva, T., Mokeev, V., Moutarde, H., Munevar, E., Nadel-Turonski, P., Ni, A., Niccolai, S., Niculescu, G., Niculescu, I., Osipenko, M., Pappalardo, L.L., Paremuzyan, R., Park, S., Anefalos Pereira, S., Phelps, E., Pozdniakov, S., Price, J.W., Procureur, S., Protopopescu, D., Raue, B.A., Ricco, G., Ripani, M., Ritchie, B.G., Rossi, P., Schott, D., Seraydaryan, H., Stepanyan, S., Stoler, P., Taiuti, M., Tang, W., Tedeschi, D.J., Tkachenko, S., Ungaro, M., Vineyard, M.F., Voskanyan, H., Watts, D., Weinstein, L.B., Weygand, D.P., Wood, M.H., Zachariou, N., Zhao, B.
Format:	Artikel
Sprache:	eng
Schlagworte:	COHERENCE LENGTH COLOR DEUTERIUM ELECTRON BEAMS ELECTROPRODUCTION Exact sciences and technology FLUCTUATIONS LIFETIME Nuclear physics NUCLEAR PHYSICS AND RADIATION PHYSICS NUCLEI Physics PHYSICS OF ELEMENTARY PARTICLES AND FIELDS TARGETS The physics of elementary particles and fields
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Zusammenfassung:	We have measured the nuclear transparency of the incoherent diffractive A(e,e′ρ0) process in 12C and 56Fe targets relative to 2H using a 5 GeV electron beam. The nuclear transparency, the ratio of the produced ρ0ʼs on a nucleus relative to deuterium, which is sensitive to ρA interaction, was studied as function of the coherence length (lc), a lifetime of the hadronic fluctuation of the virtual photon, and the four-momentum transfer squared (Q2). While the transparency for both 12C and 56Fe showed no lc dependence, a significant Q2 dependence was measured, which is consistent with calculations that included the color transparency effects.
ISSN:	0370-2693 1873-2445
DOI:	10.1016/j.physletb.2012.05.019