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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.
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.
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.
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.
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