Evidence for the onset of color transparency in ρ <sup>0</sup> electroproduction off nuclei
Journal
Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Date Issued
2012-06-12
Author(s)
El Fassi, L.
Zana, L.
Hafidi, K.
Holtrop, M.
Mustapha, B.
Departamento de Física
Hakobyan, Hayk
Departamento de Física
Zheng, X.
Adhikari, K. P.
Adikaram, D.
Aghasyan, M.
Amaryan, M. J.
Anghinolfi, M.
Arrington, J.
Avakian, H.
Baghdasaryan, H.
Battaglieri, M.
Batourine, V.
Bedlinskiy, I.
Biselli, A. S.
Bookwalter, C.
Branford, D.
Briscoe, W. J.
Bültmann, 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, G. E.
Doughty, D.
Dupre, R.
Egiyan, H.
My Ahmed , El Alaoui
Elouadrhiri, L.
Eugenio, P.
Fedotov, G.
Fegan, S.
Gabrielyan, M. Y.
Garçon, M.
Gevorgyan, N.
Gilfoyle, G. P.
Giovanetti, K. L.
Girod, F. X.
Goetz, J. T.
Gohn, W.
Golovatch, E.
Gothe, R. W.
Griffioen, K. A.
Guidal, M.
Guo, L.
Hanretty, C.
Heddle, D.
Hicks, K.
Holt, R. J.
Hyde, C. E.
Ilieva, Y.
Ireland, D. G.
Ishkhanov, B. S.
Isupov, E. L.
Jawalkar, S. S.
Keller, D.
Khandaker, M.
Khetarpal, P.
Kim, A.
Kim, W.
Klein, A.
Klein, F. J.
Kubarovsky, V.
Kuhn, S. E.
Kuznetsov, V.
Laget, J. M.
Lu, H. Y.
MacGregor, I. J.D.
Mao, Y.
Markov, N.
Mayer, M.
McAndrew, J.
McKinnon, B.
Meyer, C. A.
Mineeva, T.
Mirazita, M.
Mokeev, V.
Moreno, B.
Moutarde, H.
Munevar, E.
Nadel-Turonski, P.
Ni, A.
DOI
10.1016/j.physletb.2012.05.019
Abstract
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 ρ0’s on a nucleus relative to deuterium, which is sensitive to ρ A 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 (Q 2). While the transparency for both 12C and 56Fe showed no
lc dependence, a significant Q 2 dependence was measured, which is consistent with calculations that
included the color transparency effects.
ρ0) process in 12C and 56Fe targets relative to 2H using a 5 GeV electron beam. The nuclear transparency, the ratio of the
produced ρ0’s on a nucleus relative to deuterium, which is sensitive to ρ A 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 (Q 2). While the transparency for both 12C and 56Fe showed no
lc dependence, a significant Q 2 dependence was measured, which is consistent with calculations that
included the color transparency effects.
Subjects
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