/ nucl-ex arXiv:1702.07705


Coherent diffractive photoproduction of $\rho^{0}$ mesons on gold nuclei at RHIC


Adamczyk, L. (AGH-UST, Cracow) ; Adkins, J.K. (U. Kentucky, Lexington) ; Agakishiev, G. (Dubna, JINR) ; Aggarwal, M.M. (Panjab U.) ; Ahammed, Z. (Calcutta, VECC) ; Ajitanand, N.N. (SUNY, Stony Brook) ; Alekseev, I. (Moscow Phys. Eng. Inst.) ; Anderson, D.M. (Texas A-M) ; Aoyama, R. (Tsukuba U.) ; Aparin, A. (Dubna, JINR) ; Arkhipkin, D. (Brookhaven Natl. Lab.) ; Aschenauer, E.C. (Brookhaven Natl. Lab.) ; Ashraf, M.U. (Tsinghua U., Beijing) ; Attri, A. (Panjab U.) ; Averichev, G.S. (Dubna, JINR) ; Bai, X. (CCNU, Wuhan, Inst. Part. Phys.) ; Bairathi, V. (NISER, Jatni) ; Behera, A. (SUNY, Stony Brook) ; Bellwied, R. (Houston U.) ; Bhasin, A. (Jammu U.) ; Bhati, A.K. (Panjab U.) ; Bhattarai, P. (Texas U.) ; Bielcik, J. (Prague, Tech. U.) ; Bielcikova, J. (Rez, Nucl. Phys. Inst.) ; Bland, L.C. (Brookhaven Natl. Lab.) ; Bordyuzhin, I.G. (Moscow, ITEP) ; Bouchet, J. (Kent State U. (main)) ; Brandenburg, J.D. (Rice U.) ; Brandin, A.V. (Moscow Phys. Eng. Inst.) ; Brown, D. (Lehigh U.) ; Bunzarov, I. (Dubna, JINR) ; Butterworth, J. (Rice U.) ; Caines, H. (Yale U.) ; Calderón de la Barca Sánchez, M. (UC, Davis) ; Campbell, J.M. (Ohio State U.) ; Cebra, D. (UC, Davis) ; Chakaberia, I. (Brookhaven Natl. Lab.) ; Chaloupka, P. (Prague, Tech. U.) ; Chang, Z. (Texas A-M) ; Chankova-Bunzarova, N. (Dubna, JINR) ; Chatterjee, A. (Calcutta, VECC) ; Chattopadhyay, S. (Calcutta, VECC) ; Chen, X. (Hefei, CUST) ; Chen, J.H. (SINAP, Shanghai) ; Chen, X. (Lanzhou, Inst. Modern Phys.) ; Cheng, J. (Tsinghua U., Beijing) ; Cherney, M. (Creighton U.) ; Christie, W. (Brookhaven Natl. Lab.) ; Contin, G. (LBL, Berkeley) ; Crawford, H.J. (UC, Berkeley) ; Das, S. (CCNU, Wuhan, Inst. Part. Phys.) ; De Silva, L.C. (Creighton U.) ; Debbe, R.R. (Brookhaven Natl. Lab.) ; Dedovich, T.G. (Dubna, JINR) ; Deng, J. (Shandong U.) ; Derevschikov, A.A. (Serpukhov, IHEP) ; Didenko, L. (Brookhaven Natl. Lab.) ; Dilks, C. (Penn State U.) ; Dong, X. (LBL, Berkeley) ; Drachenberg, J.L. (Lamar U.) ; Draper, J.E. (UC, Davis) ; Dunkelberger, L.E. (UCLA) ; Dunlop, J.C. (Brookhaven Natl. Lab.) ; Efimov, L.G. (Dubna, JINR) ; Elsey, N. (Wayne State U.) ; Engelage, J. (UC, Berkeley) ; Eppley, G. (Rice U.) ; Esha, R. (UCLA) ; Esumi, S. (Tsukuba U.) ; Evdokimov, O. (Illinois U., Chicago) ; Ewigleben, J. (Lehigh U.) ; Eyser, O. (Brookhaven Natl. Lab.) ; Fatemi, R. (U. Kentucky, Lexington) ; Fazio, S. (Brookhaven Natl. Lab.) ; Federic, P. (Rez, Nucl. Phys. Inst.) ; Federicova, P. (Prague, Tech. U.) ; Fedorisin, J. (Dubna, JINR) ; Feng, Z. (CCNU, Wuhan, Inst. Part. Phys.) ; Filip, P. (Dubna, JINR) ; Finch, E. (Southern Connecticut State U., New Haven) ; Fisyak, Y. (Brookhaven Natl. Lab.) ; Flores, C.E. (UC, Davis) ; Fulek, L. (AGH-UST, Cracow) ; Gagliardi, C.A. (Texas A-M) ; Garand, D. (Purdue U.) ; Geurts, F. (Rice U.) ; Gibson, A. (Valparaiso U., Indiana) ; Girard, M. (Warsaw U. of Tech.) ; Grosnick, D. (Valparaiso U., Indiana) ; Gunarathne, D.S. (Temple U.) ; Guo, Y. (Kent State U. (main)) ; Gupta, A. (Jammu U.) ; Gupta, S. (Jammu U.) ; Guryn, W. (Brookhaven Natl. Lab.) ; Hamad, A.I. (Kent State U. (main)) ; Hamed, A. (Texas A-M) ; Harlenderova, A. (Prague, Tech. U.) ; Harris, J.W. (Yale U.) ; He, L. (Purdue U.) ; Heppelmann, S. (Penn State U.) ; Heppelmann, S. (UC, Davis) ; Hirsch, A. (Purdue U.) ; Hoffmann, G.W. (Texas U.) ; Horvat, S. (Yale U.) ; Huang, T. (Taiwan, Natl. Cheng Kung U.) ; Huang, B. (Illinois U., Chicago) ; Huang, X. (Tsinghua U., Beijing) ; Huang, H.Z. (UCLA) ; Humanic, T.J. (Ohio State U.) ; Huo, P. (SUNY, Stony Brook) ; Igo, G. (UCLA) ; Jacobs, W.W. (Indiana U.) ; Jentsch, A. (Texas U.) ; Jia, J. (SUNY, Stony Brook) ; Jiang, K. (Hefei, CUST) ; Jowzaee, S. (Wayne State U.) ; Judd, E.G. (UC, Berkeley) ; Kabana, S. (Kent State U. (main)) ; Kalinkin, D. (Indiana U.) ; Kang, K. (Tsinghua U., Beijing) ; Kauder, K. (Wayne State U.) ; Ke, H.W. (Brookhaven Natl. Lab.) ; Keane, D. (Kent State U. (main)) ; Kechechyan, A. (Dubna, JINR) ; Khan, Z. (Illinois U., Chicago) ; Kikoła , D.P. (Warsaw U. of Tech.) ; Kisel, I. (Frankfurt U., FIAS) ; Kisiel, A. (Warsaw U. of Tech.) ; Klein, S.R. (LBL, Berkeley) ; Kochenda, L. (Moscow Phys. Eng. Inst.) ; Kocmanek, M. (Rez, Nucl. Phys. Inst.) ; Kollegger, T. (Frankfurt U., FIAS) ; Kosarzewski, L.K. (Warsaw U. of Tech.) ; Kraishan, A.F. (Temple U.) ; Kravtsov, P. (Moscow Phys. Eng. Inst.) ; Krueger, K. (Argonne (main)) ; Kulathunga, N. (Houston U.) ; Kumar, L. (Panjab U.) ; Kvapil, J. (Prague, Tech. U.) ; Kwasizur, J.H. (Indiana U.) ; Lacey, R. (SUNY, Stony Brook) ; Landgraf, J.M. (Brookhaven Natl. Lab.) ; Landry, K.D. (UCLA) ; Lauret, J. (Brookhaven Natl. Lab.) ; Lebedev, A. (Brookhaven Natl. Lab.) ; Lednicky, R. (Dubna, JINR) ; Lee, J.H. (Brookhaven Natl. Lab.) ; Li, X. (Hefei, CUST) ; Li, C. (Hefei, CUST) ; Li, W. (SINAP, Shanghai) ; Li, Y. (Tsinghua U., Beijing) ; Lidrych, J. (Prague, Tech. U.) ; Lin, T. (Indiana U.) ; Lisa, M.A. (Ohio State U.) ; Liu, H. (Indiana U.) ; Liu, P. (SUNY, Stony Brook) ; Liu, Y. (Texas A-M) ; Liu, F. (CCNU, Wuhan, Inst. Part. Phys.) ; Ljubicic, T. (Brookhaven Natl. Lab.) ; Llope, W.J. (Wayne State U.) ; Lomnitz, M. (LBL, Berkeley) ; Longacre, R.S. (Brookhaven Natl. Lab.) ; Luo, S. (Illinois U., Chicago) ; Luo, X. (CCNU, Wuhan, Inst. Part. Phys.) ; Ma, G.L. (SINAP, Shanghai) ; Ma, L. (SINAP, Shanghai) ; Ma, Y.G. (SINAP, Shanghai) ; Ma, R. (Brookhaven Natl. Lab.) ; Magdy, N. (SUNY, Stony Brook) ; Majka, R. (Yale U.) ; Mallick, D. (NISER, Jatni) ; Margetis, S. (Kent State U. (main)) ; Markert, C. (Texas U.) ; Matis, H.S. (LBL, Berkeley) ; Meehan, K. (UC, Davis) ; Mei, J.C. (Shandong U.) ; Miller, Z.W. (Illinois U., Chicago) ; Minaev, N.G. (Serpukhov, IHEP) ; Mioduszewski, S. (Texas A-M) ; Mishra, D. (NISER, Jatni) ; Mizuno, S. (LBL, Berkeley) ; Mohanty, B. (NISER, Jatni) ; Mondal, M.M. (Bhubaneswar, Inst. Phys.) ; Morozov, D.A. (Serpukhov, IHEP) ; Mustafa, M.K. (LBL, Berkeley) ; Nasim, Md. (UCLA) ; Nayak, T.K. (Calcutta, VECC) ; Nelson, J.M. (UC, Berkeley) ; Nie, M. (SINAP, Shanghai) ; Nigmatkulov, G. (Moscow Phys. Eng. Inst.) ; Niida, T. (Wayne State U.) ; Nogach, L.V. (Serpukhov, IHEP) ; Nonaka, T. (Tsukuba U.) ; Nurushev, S.B. (Serpukhov, IHEP) ; Odyniec, G. (LBL, Berkeley) ; Ogawa, A. (Brookhaven Natl. Lab.) ; Oh, K. (Pusan Natl. U.) ; Okorokov, V.A. (Moscow Phys. Eng. Inst.) ; , D.Olvitt Jr. (Temple U.) ; Page, B.S. (Brookhaven Natl. Lab.) ; Pak, R. (Brookhaven Natl. Lab.) ; Pandit, Y. (Illinois U., Chicago) ; Panebratsev, Y. (Dubna, JINR) ; Pawlik, B. (Cracow, INP) ; Pei, H. (CCNU, Wuhan, Inst. Part. Phys.) ; Perkins, C. (UC, Berkeley) ; Pile, P. (Brookhaven Natl. Lab.) ; Pluta, J. (Warsaw U. of Tech.) ; Poniatowska, K. (Warsaw U. of Tech.) ; Porter, J. (LBL, Berkeley) ; Posik, M. (Temple U.) ; Poskanzer, A.M. (LBL, Berkeley) ; Pruthi, N.K. (Panjab U.) ; Przybycien, M. (AGH-UST, Cracow) ; Putschke, J. (Wayne State U.) ; Qiu, H. (Purdue U.) ; Quintero, A. (Temple U.) ; Ramachandran, S. (U. Kentucky, Lexington) ; Ray, R.L. (Texas U.) ; Reed, R. (Lehigh U.) ; Rehbein, M.J. (Creighton U.) ; Ritter, H.G. (LBL, Berkeley) ; Roberts, J.B. (Rice U.) ; Rogachevskiy, O.V. (Dubna, JINR) ; Romero, J.L. (UC, Davis) ; Roth, J.D. (Creighton U.) ; Ruan, L. (Brookhaven Natl. Lab.) ; Rusnak, J. (Rez, Nucl. Phys. Inst.) ; Rusnakova, O. (Prague, Tech. U.) ; Sahoo, N.R. (Texas A-M) ; Sahu, P.K. (Bhubaneswar, Inst. Phys.) ; Salur, S. (LBL, Berkeley) ; Sandweiss, J. (Yale U.) ; Saur, M. (Rez, Nucl. Phys. Inst.) ; Schambach, J. (Texas U.) ; Schmah, A.M. (LBL, Berkeley) ; Schmidke, W.B. (Brookhaven Natl. Lab.) ; Schmitz, N. (Munich, Max Planck Inst.) ; Schweid, B.R. (SUNY, Stony Brook) ; Seger, J. (Creighton U.) ; Sergeeva, M. (UCLA) ; Seyboth, P. (Munich, Max Planck Inst.) ; Shah, N. (SINAP, Shanghai) ; Shahaliev, E. (Dubna, JINR) ; Shanmuganathan, P.V. (Lehigh U.) ; Shao, M. (Hefei, CUST) ; Sharma, A. (Jammu U.) ; Sharma, M.K. (Jammu U.) ; Shen, W.Q. (SINAP, Shanghai) ; Shi, Z. (LBL, Berkeley) ; Shi, S.S. (CCNU, Wuhan, Inst. Part. Phys.) ; Shou, Q.Y. (SINAP, Shanghai) ; Sichtermann, E.P. (LBL, Berkeley) ; Sikora, R. (AGH-UST, Cracow) ; Simko, M. (Rez, Nucl. Phys. Inst.) ; Singha, S. (Kent State U. (main)) ; Skoby, M.J. (Indiana U.) ; Smirnov, N. (Yale U.) ; Smirnov, D. (Brookhaven Natl. Lab.) ; Solyst, W. (Indiana U.) ; Song, L. (Houston U.) ; Sorensen, P. (Brookhaven Natl. Lab.) ; Spinka, H.M. (Argonne (main)) ; Srivastava, B. (Purdue U.) ; Stanislaus, T.D.S. (Valparaiso U., Indiana) ; Strikhanov, M. (Moscow Phys. Eng. Inst.) ; Stringfellow, B. (Purdue U.) ; Sugiura, T. (Tsukuba U.) ; Sumbera, M. (Rez, Nucl. Phys. Inst.) ; Summa, B. (Penn State U.) ; Sun, Y. (Hefei, CUST) ; Sun, X.M. (CCNU, Wuhan, Inst. Part. Phys.) ; Sun, X. (CCNU, Wuhan, Inst. Part. Phys.) ; Surrow, B. (Temple U.) ; Svirida, D.N. (Moscow, ITEP) ; Tang, A.H. (Brookhaven Natl. Lab.) ; Tang, Z. (Hefei, CUST) ; Taranenko, A. (Moscow Phys. Eng. Inst.) ; Tarnowsky, T. (Michigan State U.) ; Tawfik, A. (WLCAPP, Cairo) ; Thäder, J. (LBL, Berkeley) ; Thomas, J.H. (LBL, Berkeley) ; Timmins, A.R. (Houston U.) ; Tlusty, D. (Rice U.) ; Todoroki, T. (Brookhaven Natl. Lab.) ; Tokarev, M. (Dubna, JINR) ; Trentalange, S. (UCLA) ; Tribble, R.E. (Texas A-M) ; Tribedy, P. (Brookhaven Natl. Lab.) ; Tripathy, S.K. (Bhubaneswar, Inst. Phys.) ; Trzeciak, B.A. (Prague, Tech. U.) ; Tsai, O.D. (UCLA) ; Ullrich, T. (Brookhaven Natl. Lab.) ; Underwood, D.G. (Argonne (main)) ; Upsal, I. (Ohio State U.) ; Van Buren, G. (Brookhaven Natl. Lab.) ; van Nieuwenhuizen, G. (Brookhaven Natl. Lab.) ; Vasiliev, A.N. (Serpukhov, IHEP) ; Videbæk, F. (Brookhaven Natl. Lab.) ; Vokal, S. (Dubna, JINR) ; Voloshin, S.A. (Wayne State U.) ; Vossen, A. (Indiana U.) ; Wang, G. (UCLA) ; Wang, Y. (CCNU, Wuhan, Inst. Part. Phys.) ; Wang, F. (Purdue U.) ; Wang, Y. (Tsinghua U., Beijing) ; Webb, J.C. (Brookhaven Natl. Lab.) ; Webb, G. (Brookhaven Natl. Lab.) ; Wen, L. (UCLA) ; Westfall, G.D. (Michigan State U.) ; Wieman, H. (LBL, Berkeley) ; Wissink, S.W. (Indiana U.) ; Witt, R. (Naval Academy, Annapolis) ; Wu, Y. (Kent State U. (main)) ; Xiao, Z.G. (Tsinghua U., Beijing) ; Xie, W. (Purdue U.) ; Xie, G. (Hefei, CUST) ; Xu, J. (CCNU, Wuhan, Inst. Part. Phys.) ; Xu, N. (LBL, Berkeley) ; Xu, Q.H. (Shandong U.) ; Xu, Y.F. (SINAP, Shanghai) ; Xu, Z. (Brookhaven Natl. Lab.) ; Yang, Y. (Taiwan, Natl. Cheng Kung U.) ; Yang, Q. (Hefei, CUST) ; Yang, C. (Shandong U.) ; Yang, S. (Brookhaven Natl. Lab.) ; Ye, Z. (Illinois U., Chicago) ; Yi, L. (Yale U.) ; Yip, K. (Brookhaven Natl. Lab.) ; Yoo, I.-K. (Pusan Natl. U.) ; Yu, N. (CCNU, Wuhan, Inst. Part. Phys.) ; Zbroszczyk, H. (Warsaw U. of Tech.) ; Zha, W. (Hefei, CUST) ; Zhang, Z. (SINAP, Shanghai) ; Zhang, X.P. (Tsinghua U., Beijing) ; Zhang, J.B. (CCNU, Wuhan, Inst. Part. Phys.) ; Zhang, S. (Hefei, CUST) ; Zhang, J. (Lanzhou, Inst. Modern Phys.) ; Zhang, Y. (Hefei, CUST) ; Zhang, J. (LBL, Berkeley) ; Zhang, S. (SINAP, Shanghai) ; Zhao, J. (Purdue U.) ; Zhong, C. (SINAP, Shanghai) ; Zhou, L. (Hefei, CUST) ; Zhou, C. (SINAP, Shanghai) ; Zhu, X. (Tsinghua U., Beijing) ; Zhu, Z. (Shandong U.) ; Zyzak, M. (Frankfurt U., FIAS)

Pages: 24

Abstract: The STAR Collaboration reports on the photoproduction of $\pi^+\pi^-$ pairs in gold-gold collisions at a center-of-mass energy of 200 GeV/nucleon-pair. These pion pairs are produced when a nearly-real photon emitted by one ion scatters from the other ion. We fit the $\pi^+\pi^-$ invariant mass spectrum with a combination of $\rho$ and $\omega$ resonances and a direct $\pi^+\pi^-$ continuum. This is the first observation of the $\omega$ in ultra-peripheral collisions, and the first measurement of $\rho-\omega$ interference at energies where photoproduction is dominated by Pomeron exchange. The $\omega$ amplitude is consistent with the measured $\gamma p\rightarrow \omega p$ cross section, a classical Glauber calculation and the $\omega\rightarrow\pi^+\pi^-$ branching ratio. The $\omega$ phase angle is similar to that observed at much lower energies, showing that the $\rho-\omega$ phase difference does not depend significantly on photon energy. The $\rho^0$ differential cross section $d\sigma/dt$ exhibits a clear diffraction pattern, compatible with scattering from a gold nucleus, with 2 minima visible. The positions of the diffractive minima agree better with the predictions of a quantum Glauber calculation that does not include nuclear shadowing than with a calculation that does include shadowing.

Web-Page: http://inspirehep.net/record/1515028/files/Figure1.png; http://inspirehep.net/record/1515028/files/Figure2.png; http://inspirehep.net/record/1515028/files/Figure6.png; http://inspirehep.net/record/1515028/files/Figure3.png; http://inspirehep.net/record/1515028/files/Figure5.png; http://inspirehep.net/record/1515028/files/Figure9.png; http://inspirehep.net/record/1515028/files/Figure4.png; http://inspirehep.net/record/1515028/files/Figure8.png; http://inspirehep.net/record/1515028/files/Figure7.png; http://inspirehep.net/record/1515028/files/arXiv:1702.07705.pdf


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