Evidence for the Onset of Color Transparency in $\rho^0$ Electroproduction off Nuclei

A. Celentano; A. D'Angelo; A. Daniel; A. Deur; A. El Alaoui; A. I. Ostrovidov; A. Kim; A. Klein; A. Ni; A. S. Biselli

Evidence for the Onset of Color Transparency in rho⁰ Electroproduction off Nuclei

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arxiv 1201.2735 v4 pith:NFZURZ5L submitted 2012-01-13 nucl-ex

Evidence for the Onset of Color Transparency in rho⁰ Electroproduction off Nuclei

L. El Fassi , L. Zana , K. Hafidi , M. Holtrop , B. Mustapha , W. K. Brooks , H. Hakobyan , X. Zheng

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K. P. Adhikari D. Adikaram M. Aghasyan M. J. Amaryan M. Anghinolfi J. Arrington H. Avakian H. Baghdasaryan M. Battaglieri V. Batourine I. Bedlinskiy A. S. Biselli C. Bookwalter D. Branford W. J. Briscoe S. Bultmann V. D. Burkert D. S. Carman A. Celentano S. Chandavar P. L. Cole M. Contalbrigo V. Crede A. D'Angelo A. Daniel N. Dashyan R. De Vita E. De Sanctis A. Deur B. Dey R. Dickson C. Djalali G. E. Dodge D. Doughty R. Dupre H. Egiyan A. El Alaoui L. Elouadrhiri P. Eugenio G. Fedotov S. Fegan M. Y. Gabrielyan M. Garcon N. Gevorgyan G. P. Gilfoyle K. L. Giovanetti F. X. Girod J. T. Goetz W. Gohn E. Golovatch R. W. Gothe K. A. Griffioen M. Guidal L. Guo C. Hanretty D. Heddle K. Hicks R. J. Holt C. E. Hyde Y. Ilieva D. G. Ireland B. S. Ishkhanov E. L. Isupov S. S. Jawalkar D. Keller M. Khandaker P. Khetarpal A. Kim W. Kim A. Klein F. J. Klein V. Kubarovsky S. E. Kuhn S. V. Kuleshov V. Kuznetsov J. M. Laget H. Y. Lu I. J. D. MacGregor Y. Mao N. Markov M. Mayer J. McAndrew B. McKinnon C. A. Meyer T. Mineeva M. Mirazita V. Mokeev B. Moreno H. Moutarde E. Munevar P. Nadel-Turonski A. Ni S. Niccolai G. Niculescu I. Niculescu M. Osipenko A. I. Ostrovidov L. Pappalardo R. Paremuzyan K. Park S. Park E. Pasyuk S. Anefalos Pereira E. Phelps S. Pisano S. Pozdniakov J. W. Price S. Procureur D. Protopopescu B. A. Raue P. E. Reimer G. Ricco D. Rimal M. Ripani B. G. Ritchie G. Rosner P. Rossi F. Sabatie M. S. Saini C. Salgado D. Schott R. A. Schumacher H. Seraydaryan Y. G. Sharabian E. S. Smith G. D. Smith D. I. Sober D. Sokhan S. S. Stepanyan S. Stepanyan P. Stoler S. Strauch M. Taiuti W. Tang C. E. Taylor D. J. Tedeschi S. Tkachenko M. Ungaro B .Vernarsky M. F. Vineyard H. Voskanyan E. Voutier D. Watts L. B. Weinstein D. P. Weygand M. H. Wood N. Zachariou B. Zhao Z. W. Zhao

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We have measured the nuclear transparency of the incoherent diffractive $A(e,e'\rho^0)$ process in $^{12}$C and $^{56}$Fe targets relative to $^2$H using a 5 GeV electron beam. The nuclear transparency, the ratio of the produced $\rho^0$'s on a nucleus relative to deuterium, which is sensitive to $\rho A$ 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 $^{12}$C and $^{56}$Fe showed no $l_c$ dependence, a significant $Q^2$ dependence was measured, which is consistent with calculations that included the color transparency effects.

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Short-range correlations in nuclei
nucl-ex 2026-05 unverdicted novelty 2.0

Short-range correlated pairs account for roughly 20% of nucleons in any nucleus and nearly all high-momentum nucleons, originating from the nucleon-nucleon tensor force.