Skip to main content

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

Publication ,  Journal Article
Collaboration, STAR; Adamczyk, L; Adkins, JK; Agakishiev, G; Aggarwal, MM; Ahammed, Z; Ajitanand, NN; Alekseev, I; Anderson, DM; Aoyama, R ...
February 24, 2017

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.

Duke Scholars

Publication Date

February 24, 2017
 

Citation

APA
Chicago
ICMJE
MLA
NLM
Collaboration, S. T. A. R., Adamczyk, L., Adkins, J. K., Agakishiev, G., Aggarwal, M. M., Ahammed, Z., … Zyzak, M. (2017). Coherent diffractive photoproduction of $ρ^{0}$ mesons on gold nuclei at RHIC.
Collaboration, S. T. A. R., L. Adamczyk, J. K. Adkins, G. Agakishiev, M. M. Aggarwal, Z. Ahammed, N. N. Ajitanand, et al. “Coherent diffractive photoproduction of $ρ^{0}$ mesons on gold nuclei at RHIC,” February 24, 2017.
Collaboration STAR, Adamczyk L, Adkins JK, Agakishiev G, Aggarwal MM, Ahammed Z, et al. Coherent diffractive photoproduction of $ρ^{0}$ mesons on gold nuclei at RHIC. 2017 Feb 24;
Collaboration STAR, 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, Sánchez MCDLB, Campbell JM, Cebra D, Chakaberia I, Chaloupka P, Chang Z, Chankova-Bunzarova N, Chatterjee A, Chattopadhyay S, Chen X, Chen JH, Cheng J, Cherney M, Christie W, Contin G, Crawford HJ, Das S, Silva LCD, 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, Fujita J, 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, Hirsch A, Hoffmann GW, Horvat S, Huang B, Huang T, Huang HZ, Huang X, 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 W, Li X, Li C, Li Y, Lidrych J, Lin T, Lisa MA, Liu Y, Liu F, Liu H, Liu P, Ljubicic T, Llope WJ, Lomnitz M, Longacre RS, Luo S, Luo X, Ma GL, Ma YG, Ma L, 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 M, Nayak TK, Nelson JM, Nie M, Nigmatkulov G, Niida T, Nogach LV, Nonaka T, Nurushev SB, Odyniec G, Ogawa A, Oh K, Okorokov VA, Jr DO, 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, Buren GV, Nieuwenhuizen GV, Vasiliev AN, Videbæk F, Vokal S, Voloshin SA, Vossen A, Wang G, Wang Y, Wang F, 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, 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, Zhao J, Zhong C, Zhou L, Zhou C, Zhu X, Zhu Z, Zyzak M. Coherent diffractive photoproduction of $ρ^{0}$ mesons on gold nuclei at RHIC. 2017 Feb 24;

Publication Date

February 24, 2017