Coherent diffractive photoproduction of 0 mesons on gold nuclei at 200 GeV/nucleon-pair at the Relativistic Heavy Ion Collider Academic Article uri icon

abstract

  • 2017 American Physical Society. The STAR Collaboration reports on the photoproduction of +- 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 +- invariant-mass spectrum with a combination of 0 and resonances and a direct +- continuum. This is the first observation of the in ultraperipheral collisions, and the first measurement of - interference at energies where photoproduction is dominated by Pomeron exchange. The amplitude is consistent with the measured pp cross section, a classical Glauber calculation, and the +- branching ratio. The phase angle is similar to that observed at much lower energies, showing that the - phase difference does not depend significantly on photon energy. The 0 differential cross section d/dt exhibits a clear diffraction pattern, compatible with scattering from a gold nucleus, with two 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.

published proceedings

  • Physical Review C

altmetric score

  • 0.5

author list (cited authors)

  • Adamczyk, L., Adkins, J. K., Agakishiev, G., Aggarwal, M. M., Ahammed, Z., Ajitanand, N. N., ... Zyzak, M.

citation count

  • 23

complete list of authors

  • Adamczyk, L||Adkins, JK||Agakishiev, G||Aggarwal, MM||Ahammed, Z||Ajitanand, NN||Alekseev, I||Anderson, DM||Aoyama, R||Aparin, A||Arkhipkin, D||Aschenauer, EC||Ashraf, MU||Attri, A||Averichev, GS||Bai, X||Bairathi, V||Behera, A||Bellwied, R||Bhasin, A||Bhati, AK||Bhattarai, P||Bielcik, J||Bielcikova, J||Bland, LC||Bordyuzhin, IG||Bouchet, J||Brandenburg, JD||Brandin, AV||Brown, D||Bunzarov, I||Butterworth, J||Caines, H||Calderón de la Barca Sánchez, M||Campbell, JM||Cebra, D||Chakaberia, I||Chaloupka, P||Chang, Z||Chankova-Bunzarova, N||Chatterjee, A||Chattopadhyay, S||Chen, X||Chen, JH||Chen, X||Cheng, J||Cherney, M||Christie, W||Contin, G||Crawford, HJ||Das, S||De Silva, LC||Debbe, RR||Dedovich, TG||Deng, J||Derevschikov, AA||Didenko, L||Dilks, C||Dong, X||Drachenberg, JL||Draper, JE||Dunkelberger, LE||Dunlop, JC||Efimov, LG||Elsey, N||Engelage, J||Eppley, G||Esha, R||Esumi, S||Evdokimov, O||Ewigleben, J||Eyser, O||Fatemi, R||Fazio, S||Federic, P||Federicova, P||Fedorisin, J||Feng, Z||Filip, P||Finch, E||Fisyak, Y||Flores, CE||Fulek, L||Gagliardi, CA||Garand, D||Geurts, F||Gibson, A||Girard, M||Grosnick, D||Gunarathne, DS||Guo, Y||Gupta, A||Gupta, S||Guryn, W||Hamad, AI||Hamed, A||Harlenderova, A||Harris, JW||He, L||Heppelmann, S||Heppelmann, S||Hirsch, A||Hoffmann, GW||Horvat, S||Huang, T||Huang, B||Huang, X||Huang, HZ||Humanic, TJ||Huo, P||Igo, G||Jacobs, WW||Jentsch, A||Jia, J||Jiang, K||Jowzaee, S||Judd, EG||Kabana, S||Kalinkin, D||Kang, K||Kauder, K||Ke, HW||Keane, D||Kechechyan, A||Khan, Z||Kikoła, DP||Kisel, I||Kisiel, A||Klein, SR||Kochenda, L||Kocmanek, M||Kollegger, T||Kosarzewski, LK||Kraishan, AF||Kravtsov, P||Krueger, K||Kulathunga, N||Kumar, L||Kvapil, J||Kwasizur, JH||Lacey, R||Landgraf, JM||Landry, KD||Lauret, J||Lebedev, A||Lednicky, R||Lee, JH||Li, X||Li, C||Li, W||Li, Y||Lidrych, J||Lin, T||Lisa, MA||Liu, H||Liu, P||Liu, Y||Liu, F||Ljubicic, T||Llope, WJ||Lomnitz, M||Longacre, RS||Luo, S||Luo, X||Ma, GL||Ma, L||Ma, YG||Ma, R||Magdy, N||Majka, R||Mallick, D||Margetis, S||Markert, C||Matis, HS||Meehan, K||Mei, JC||Miller, ZW||Minaev, NG||Mioduszewski, S||Mishra, D||Mizuno, S||Mohanty, B||Mondal, MM||Morozov, DA||Mustafa, MK||Nasim, Md||Nayak, TK||Nelson, JM||Nie, M||Nigmatkulov, G||Niida, T||Nogach, LV||Nonaka, T||Nurushev, SB||Odyniec, G||Ogawa, A||Oh, K||Okorokov, VA||Olvitt, D||Page, BS||Pak, R||Pandit, Y||Panebratsev, Y||Pawlik, B||Pei, H||Perkins, C||Pile, P||Pluta, J||Poniatowska, K||Porter, J||Posik, M||Poskanzer, AM||Pruthi, NK||Przybycien, M||Putschke, J||Qiu, H||Quintero, A||Ramachandran, S||Ray, RL||Reed, R||Rehbein, MJ||Ritter, HG||Roberts, JB||Rogachevskiy, OV||Romero, JL||Roth, JD||Ruan, L||Rusnak, J||Rusnakova, O||Sahoo, NR||Sahu, PK||Salur, S||Sandweiss, J||Saur, M||Schambach, J||Schmah, AM||Schmidke, WB||Schmitz, N||Schweid, BR||Seger, J||Sergeeva, M||Seyboth, P||Shah, N||Shahaliev, E||Shanmuganathan, PV||Shao, M||Sharma, A||Sharma, MK||Shen, WQ||Shi, Z||Shi, SS||Shou, QY||Sichtermann, EP||Sikora, R||Simko, M||Singha, S||Skoby, MJ||Smirnov, N||Smirnov, D||Solyst, W||Song, L||Sorensen, P||Spinka, HM||Srivastava, B||Stanislaus, TDS||Strikhanov, M||Stringfellow, B||Sugiura, T||Sumbera, M||Summa, B||Sun, Y||Sun, XM||Sun, X||Surrow, B||Svirida, DN||Tang, AH||Tang, Z||Taranenko, A||Tarnowsky, T||Tawfik, A||Thäder, J||Thomas, JH||Timmins, AR||Tlusty, D||Todoroki, T||Tokarev, M||Trentalange, S||Tribble, RE||Tribedy, P||Tripathy, SK||Trzeciak, BA||Tsai, OD||Ullrich, T||Underwood, DG||Upsal, I||Van Buren, G||van Nieuwenhuizen, G||Vasiliev, AN||Videbæk, F||Vokal, S||Voloshin, SA||Vossen, A||Wang, G||Wang, Y||Wang, F||Wang, Y||Webb, JC||Webb, G||Wen, L||Westfall, GD||Wieman, H||Wissink, SW||Witt, R||Wu, Y||Xiao, ZG||Xie, W||Xie, G||Xu, J||Xu, N||Xu, QH||Xu, YF||Xu, Z||Yang, Y||Yang, Q||Yang, C||Yang, S||Ye, Z||Ye, Z||Yi, L||Yip, K||Yoo, I-K||Yu, N||Zbroszczyk, H||Zha, W||Zhang, Z||Zhang, XP||Zhang, JB||Zhang, S||Zhang, J||Zhang, Y||Zhang, J||Zhang, S||Zhao, J||Zhong, C||Zhou, L||Zhou, C||Zhu, X||Zhu, Z||Zyzak, M

publication date

  • November 2017