Evidence for the onset of color transparency in electroproduction off nuclei

• Published in: Physics letters. B Vol. 712; no. 4-5; pp. 326 - 330
• Main Authors: El Fassi, L, Zana, L, Hafidi, K, Holtrop, M, Mustapha, B, Brooks, W K, Hakobyan, H, Zheng, X, Adhikari, K P, Adikaram, D, Aghasyan, M, Amaryan, MJ, Anghinolfi, M, Arrington, J, Avakian, H, Baghdasaryan, H, Battaglieri, M, Batourine, V, Bedlinskiy, I, Biselli, A S, Bookwalter, C, Branford, D, Briscoe, W J, Bultmann, S, Burkert, V D, Carman, D S, Celentano, A, Chandavar, S, Cole, P L, Contalbrigo, M, Crede, V, D'Angelo, A, Daniel, A, Dashyan, N, De Vita, R, De Sanctis, E, Deur, A, Dey, B, Dickson, R, Djalali, C, Dodge, GE, Doughty, D, Dupre, R, Egiyan, H, El Alaoui, A, Elouadrhiri, L, Eugenio, P, Fedotov, G, Fegan, S, Gabrielyan, MY
• Format: Journal Article
• Language: English
• Published: 12.06.2012
• Subjects: Coherence; Color; Deuterium; Diffraction; Elementary particles; Fluctuation; Mathematical analysis; Photons
• ISSN: 0370-2693
• DOI: 10.1016/j.physletb.2012.05.019

We have measured the nuclear transparency of the incoherent diffractive A ( e , e a2 I 0 ) process in 12C and 56Fe targets relative to 2H using a 5 GeV electron beam. The nuclear transparency, the ratio of the produced I 0 E14s on a nucleus relative to deuterium, which is sensitive to IA interaction, was studied as function of the coherence length ( l c ), a lifetime of the hadronic fluctuation of the virtual photon, and the four-momentum transfer squared ( Q 2 ). While the transparency for both 12C and 56Fe showed no l c dependence, a significant Q 2 dependence was measured, which is consistent with calculations that included the color transparency effects.