Coherent diffractive photoproduction of $ρ^{0}$ mesons on gold nuclei at RHIC
Creators: name: STAR Collaboration
name: Adamczyk, L.
name: Adkins, J. K.
name: Agakishiev, G.
name: Aggarwal, M. M.
name: Ahammed, Z.
name: Ajitanand, N. N.
name: Alekseev, I.
name: Anderson, D. M.
name: Aoyama, R.
name: Aparin, A.
name: Arkhipkin, D.
name: Aschenauer, E. C.
name: Ashraf, M. U.
name: Attri, A.
name: Averichev, G. S.
name: Bai, X.
name: Bairathi, V.
name: Behera, A.
name: Bellwied, R.
name: Bhasin, A.
name: Bhati, A. K.
name: Bhattarai, P.
name: Bielcik, J.
name: Bielcikova, J.
name: Bland, L. C.
name: Bordyuzhin, I. G.
name: Bouchet, J.
name: Brandenburg, J. D.
name: Brandin, A. V.
name: Brown, D.
name: Bunzarov, I.
name: Butterworth, J.
name: Caines, H.
name: Sánchez, M. Calderón de la Barca
name: Campbell, J. M.
name: Cebra, D.
name: Chakaberia, I.
name: Chaloupka, P.
name: Chang, Z.
name: Chankova-Bunzarova, N.
name: Chatterjee, A.
name: Chattopadhyay, S.
name: Chen, X.
name: Chen, X.
name: Chen, J. H.
name: Cheng, J.
name: Cherney, M.
name: Christie, W.
name: Contin, G.
name: Crawford, H. J.
name: Das, S.
name: De Silva, L. C.
name: Debbe, R. R.
name: Dedovich, T. G.
name: Deng, J.
name: Derevschikov, A. A.
name: Didenko, L.
name: Dilks, C.
name: Dong, X.
name: Drachenberg, J. L.
name: Draper, J. E.
name: Dunkelberger, L. E.
name: Dunlop, J. C.
name: Efimov, L. G.
name: Elsey, N.
name: Engelage, J.
name: Eppley, G.
name: Esha, R.
name: Esumi, S.
name: Evdokimov, O.
name: Ewigleben, J.
name: Eyser, O.
name: Fatemi, R.
name: Fazio, S.
name: Federic, P.
name: Federicova, P.
name: Fedorisin, J.
name: Feng, Z.
name: Filip, P.
name: Finch, E.
name: Fisyak, Y.
name: Flores, C. E.
name: Fujita, J.
name: Fulek, L.
name: Gagliardi, C. A.
name: Garand, D.
name: Geurts, F.
name: Gibson, A.
name: Girard, M.
name: Grosnick, D.
name: Gunarathne, D. S.
name: Guo, Y.
name: Gupta, A.
name: Gupta, S.
name: Guryn, W.
name: Hamad, A. I.
name: Hamed, A.
name: Harlenderova, A.
name: Harris, J. W.
name: He, L.
name: Heppelmann, S.
name: Heppelmann, S.
name: Hirsch, A.
name: Hoffmann, G. W.
name: Horvat, S.
name: Huang, B.
name: Huang, T.
name: Huang, H. Z.
name: Huang, X.
name: Humanic, T. J.
name: Huo, P.
name: Igo, G.
name: Jacobs, W. W.
name: Jentsch, A.
name: Jia, J.
name: Jiang, K.
name: Jowzaee, S.
name: Judd, E. G.
name: Kabana, S.
name: Kalinkin, D.
name: Kang, K.
name: Kauder, K.
name: Ke, H. W.
name: Keane, D.
name: Kechechyan, A.
name: Khan, Z.
name: Kikoła, D. P.
name: Kisel, I.
name: Kisiel, A.
name: Klein, S. R.
name: Kochenda, L.
name: Kocmanek, M.
name: Kollegger, T.
name: Kosarzewski, L. K.
name: Kraishan, A. F.
name: Kravtsov, P.
name: Krueger, K.
name: Kulathunga, N.
name: Kumar, L.
name: Kvapil, J.
name: Kwasizur, J. H.
name: Lacey, R.
name: Landgraf, J. M.
name: Landry, K. D.
name: Lauret, J.
name: Lebedev, A.
name: Lednicky, R.
name: Lee, J. H.
name: Li, W.
name: Li, X.
name: Li, C.
name: Li, Y.
name: Lidrych, J.
name: Lin, T.
name: Lisa, M. A.
name: Liu, Y.
name: Liu, F.
name: Liu, H.
name: Liu, P.
name: Ljubicic, T.
name: Llope, W. J.
name: Lomnitz, M.
name: Longacre, R. S.
name: Luo, S.
name: Luo, X.
name: Ma, G. L.
name: Ma, Y. G.
name: Ma, L.
name: Ma, R.
name: Magdy, N.
name: Majka, R.
name: Mallick, D.
name: Margetis, S.
name: Markert, C.
name: Matis, H. S.
name: Meehan, K.
name: Mei, J. C.
name: Miller, Z. W.
name: Minaev, N. G.
name: Mioduszewski, S.
name: Mishra, D.
name: Mizuno, S.
name: Mohanty, B.
name: Mondal, M. M.
name: Morozov, D. A.
name: Mustafa, M. K.
name: Nasim, Md.
name: Nayak, T. K.
name: Nelson, J. M.
name: Nie, M.
name: Nigmatkulov, G.
name: Niida, T.
name: Nogach, L. V.
name: Nonaka, T.
name: Nurushev, S. B.
name: Odyniec, G.
name: Ogawa, A.
name: Oh, K.
name: Okorokov, V. A.
name: Olvitt, D.
name: Page, B. S.
name: Pak, R.
name: Pandit, Y.
name: Panebratsev, Y.
name: Pawlik, B.
name: Pei, H.
name: Perkins, C.
name: Pile, P.
name: Pluta, J.
name: Poniatowska, K.
name: Porter, J.
name: Posik, M.
name: Poskanzer, A. M.
name: Pruthi, N. K.
name: Przybycien, M.
name: Putschke, J.
name: Qiu, H.
name: Quintero, A.
name: Ramachandran, S.
name: Ray, R. L.
name: Reed, R.
name: Rehbein, M. J.
name: Ritter, H. G.
name: Roberts, J. B.
name: Rogachevskiy, O. V.
name: Romero, J. L.
name: Roth, J. D.
name: Ruan, L.
name: Rusnak, J.
name: Rusnakova, O.
name: Sahoo, N. R.
name: Sahu, P. K.
name: Salur, S.
name: Sandweiss, J.
name: Saur, M.
name: Schambach, J.
name: Schmah, A. M.
name: Schmidke, W. B.
name: Schmitz, N.
name: Schweid, B. R.
name: Seger, J.
name: Sergeeva, M.
name: Seyboth, P.
name: Shah, N.
name: Shahaliev, E.
name: Shanmuganathan, P. V.
name: Shao, M.
name: Sharma, A.
name: Sharma, M. K.
name: Shen, W. Q.
name: Shi, Z.
name: Shi, S. S.
name: Shou, Q. Y.
name: Sichtermann, E. P.
name: Sikora, R.
name: Simko, M.
name: Singha, S.
name: Skoby, M. J.
name: Smirnov, N.
name: Smirnov, D.
name: Solyst, W.
name: Song, L.
name: Sorensen, P.
name: Spinka, H. M.
name: Srivastava, B.
name: Stanislaus, T. D. S.
name: Strikhanov, M.
name: Stringfellow, B.
name: Sugiura, T.
name: Sumbera, M.
name: Summa, B.
name: Sun, Y.
name: Sun, X. M.
name: Sun, X.
name: Surrow, B.
name: Svirida, D. N.
name: Tang, A. H.
name: Tang, Z.
name: Taranenko, A.
name: Tarnowsky, T.
name: Tawfik, A.
name: Thäder, J.
name: Thomas, J. H.
name: Timmins, A. R.
name: Tlusty, D.
name: Todoroki, T.
name: Tokarev, M.
name: Trentalange, S.
name: Tribble, R. E.
name: Tribedy, P.
name: Tripathy, S. K.
name: Trzeciak, B. A.
name: Tsai, O. D.
name: Ullrich, T.
name: Underwood, D. G.
name: Upsal, I.
name: Van Buren, G.
name: van Nieuwenhuizen, G.
name: Vasiliev, A. N.
name: Videbæk, F.
name: Vokal, S.
name: Voloshin, S. A.
name: Vossen, A.
name: Wang, G.
name: Wang, Y.
name: Wang, F.
name: Wang, Y.
name: Webb, J. C.
name: Webb, G.
name: Wen, L.
name: Westfall, G. D.
name: Wieman, H.
name: Wissink, S. W.
name: Witt, R.
name: Wu, Y.
name: Xiao, Z. G.
name: Xie, W.
name: Xie, G.
name: Xu, J.
name: Xu, N.
name: Xu, Q. H.
name: Xu, Y. F.
name: Xu, Z.
name: Yang, Y.
name: Yang, Q.
name: Yang, C.
name: Yang, S.
name: Ye, Z.
name: Ye, Z.
name: Yi, L.
name: Yip, K.
name: Yoo, I. -K.
name: Yu, N.
name: Zbroszczyk, H.
name: Zha, W.
name: Zhang, Z.
name: Zhang, X. P.
name: Zhang, J. B.
name: Zhang, S.
name: Zhang, J.
name: Zhang, Y.
name: Zhang, J.
name: Zhang, S.
name: Zhao, J.
name: Zhong, C.
name: Zhou, L.
name: Zhou, C.
name: Zhu, X.
name: Zhu, Z.
name: Zyzak, M.
Publisher: name: arXiv
Year: 2017
Subjects: subject: Nuclear Experiment (nucl-ex)
subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences
subject: FOS: Physical sciences

description: The STAR Collaboration reports on the photoproduction of $π^+π^-$ 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 $π^+π^-$ invariant mass spectrum with a combination of $ρ$ and $ω$ resonances and a direct $π^+π^-$ continuum. This is the first observation of the $ω$ in ultra-peripheral collisions, and the first measurement of $ρ-ω$ interference at energies where photoproduction is dominated by Pomeron exchange. The $ω$ amplitude is consistent with the measured $γp\rightarrow ωp$ cross section, a classical Glauber calculation and the $ω\rightarrowπ^+π^-$ branching ratio. The $ω$ phase angle is similar to that observed at much lower energies, showing that the $ρ-ω$ phase difference does not depend significantly on photon energy. The $ρ^0$ differential cross section $dσ/dt$ 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.
description: 24 pages with 9 figures