Exclusive J/ψ, ψ(2s) , and e+e− pair production in Au+Au ultraperipheral collisions at the BNL Relativistic Heavy Ion Collider

Abdulhamid, M_I; Aboona, B_E; Adam, J.; Adamczyk, L.; Adams, J_R; Aggarwal, I.; Aggarwal, M_M; Ahammed, Z.; Aschenauer, E_C; Aslam, S.; Atchison, J.; Bairathi, V.; Cap, J_G_Ball; Barish, K.; Bellwied, R.; Bhagat, P.; Bhasin, A.; Bhatta, S.; Bhosale, S_R; Bielcik, J.; Bielcikova, J.; Brandenburg, J_D; Broodo, C.; Cai, X_Z; Caines, H.; Sánchez, M_Calderón_de_la_Barca; Cebra, D.; Ceska, J.; Chakaberia, I.; Chaloupka, P.; Chan, B_K; Chang, Z.; Chatterjee, A.; Chen, D.; Chen, J.; Chen, J_H; Chen, Z.; Cheng, J.; Cheng, Y.; Choudhury, S.; Christie, W.; Chu, X.; Crawford, H_J; Csanád, M.; Dale-Gau, G.; Das, A.; Deppner, I_M; Dhamija, A.; Dixit, P.; Dong, X.; Drachenberg, J_L; Duckworth, E.; Dunlop, J_C; Engelage, J.; Eppley, G.; Esumi, S.; Evdokimov, O.; Eyser, O.; Fatemi, R.; Fazio, S.; Feng, C_J; Feng, Y.; Finch, E.; Fisyak, Y.; Flor, F_A; Fu, C.; Gagliardi, C_A; Galatyuk, T.; Gao, T.; Geurts, F.; Ghimire, N.; Gibson, A.; Gopal, K.; Gou, X.; Grosnick, D.; Gupta, A.; Guryn, W.; Hamed, A.; Han, Y.; Harabasz, S.; Harasty, M_D; Harris, J_W; Harrison-Smith, H.; He, W.; He, X_H; He, Y.; Herrmann, N.; Holub, L.; Hu, C.; Hu, Q.; Hu, Y.; Huang, H.; Huang, H_Z; Huang, S_L; Huang, T.; Huang, X.; Huang, Y.; Huang, Y.; Humanic, T_J; Isshiki, M.; Jacobs, W_W; Jalotra, A.; Jena, C.; Jentsch, A.; Ji, Y.; Jia, J.; Jin, C.; Ju, X.; Judd, E_G; Kabana, S.; Kalinkin, D.; Kang, K.; Kapukchyan, D.; Kauder, K.; Keane, D.; Khanal, A.; Khyzhniak, Y_V; Kikoła, D_P; Kincses, D.; Kisel, I.; Kiselev, A.; Knospe, A_G; Ko, H_S; Kosarzewski, L_K; Kumar, L.; Labonte, M_C; Lacey, R.; Landgraf, J_M; Lauret, J.; Lebedev, A.; Lee, J_H; Leung, Y_H; Lewis, N.; Li, C.; Li, D.; Li, H-S; Li, H.; Li, W.; Li, X.; Li, Y.; Li, Y.; Li, Z.; Liang, X.; Liang, Y.; Licenik, R.; Lin, T.; Lin, Y.; Lisa, M_A; Liu, C.; Liu, G.; Liu, H.; Liu, L.; Liu, T.; Liu, X.; Liu, Y.; Liu, Z.; Ljubicic, T.; Lomicky, O.; Longacre, R_S; Loyd, E_M; Lu, T.; Luo, J.; Luo, X_F; Ma, L.; Ma, R.; Ma, Y_G; Magdy, N.; Mallick, D.; Manikandhan, R.; Margetis, S.; Markert, C.; McNamara, G.; Mezhanska, O.; Mi, K.; Mioduszewski, S.; Mohanty, B.; Mondal, M_M; Mooney, I.; Mrazkova, J.; Nagy, M_I; Nain, A_S; Nam, J_D; Nasim, M.; Neff, D.; Nelson, J_M; Nemes, D_B; Nie, M.; Nigmatkulov, G.; Niida, T.; Nonaka, T.; Odyniec, G.; Ogawa, A.; Oh, S.; Okubo, K.; Page, B_S; Pak, R.; Pal, S.; Pandav, A.; Pandey, A_K; Pani, T.; Paul, A.; Pawlik, B.; Pawlowska, D.; Perkins, C.; Pluta, J.; Pokhrel, B_R; Posik, M.; Protzman, T.; Prozorova, V.; Pruthi, N_K; Przybycien, M.; Putschke, J.; Qin, Z.; Qiu, H.; Racz, C.; Radhakrishnan, S_K; Rana, A.; Ray, R_L; Reed, R.; Robertson, C_W; Robotkova, M.; Aguilar, M_A_Rosales; Roy, D.; Chowdhury, P_Roy; Ruan, L.; Sahoo, A_K; Sahoo, N_R; Sako, H.; Salur, S.; Sato, S.; Schaefer, B_C; Schmidke, W_B; Schmitz, N.; Seck, F-J; Seger, J.; Seto, R.; Seyboth, P.; Shah, N.; Shanmuganathan, P_V; Shao, T.; Sharma, M.; Sharma, N.; Sharma, R.; Sharma, S_R; Sheikh, A_I; Shen, D.; Shen, D_Y; Shen, K.; Shi, S_S; Shi, Y.; Shou, Q_Y; Si, F.; Singh, J.; Singha, S.; Sinha, P.; Skoby, M_J; Smirnov, N.; Söhngen, Y.; Song, Y.; Srivastava, B.; Stanislaus, T_D_S; Stefaniak, M.; Stewart, D_J; Su, Y.; Sumbera, M.; Sun, C.; Sun, X.; Sun, Y.; Sun, Y.; Surrow, B.; Svoboda, M.; Sweger, Z_W; Tamis, A_C; Tang, A_H; Tang, Z.; Tarnowsky, T.; Thomas, J_H; Timmins, A_R; Tlusty, D.; Todoroki, T.; Trentalange, S.; Tribedy, P.; Tripathy, S_K; Truhlar, T.; Trzeciak, B_A; Tsai, O_D; Tsang, C_Y; Tu, Z.; Tyler, J.; Ullrich, T.; Underwood, D_G; Upsal, I.; Van_Buren, G.; Vanek, J.; Vassiliev, I.; Verkest, V.; Videbæk, F.; Voloshin, S_A; Wang, F.; Wang, G.; Wang, J_S; Wang, J.; Wang, K.; Wang, X.; Wang, Y.; Wang, Y.; Wang, Y.; Wang, Z.; Webb, J_C; Weidenkaff, P_C; Westfall, G_D; Wielanek, D.; Wieman, H.; Wilks, G.; Wissink, S_W; Witt, R.; Wu, J.; Wu, J.; Wu, X.; X, Wu; Xi, B.; Xiao, Z_G; Xie, G.; Xie, W.; Xu, H.; Xu, N.; Xu, Q_H; Xu, Y.; Xu, Y.; Xu, Z.; Xu, Z.; Yan, G.; Yan, Z.; Yang, C.; Yang, Q.; Yang, S.; Yang, Y.; Ye, Z.; Ye, Z.; Yi, L.; Yip, K.; Yu, Y.; Zbroszczyk, H.; Zha, W.; Zhang, C.; Zhang, D.; Zhang, J.; Zhang, S.; Zhang, W.; Zhang, X.; Zhang, Y.; Zhang, Y.; Zhang, Y.; Zhang, Y.; Zhang, Z_J; Zhang, Z.; Zhang, Z.; Zhao, F.; Zhao, J.; Zhao, M.; Zhou, J.; Zhou, S.; Zhou, Y.; Zhu, X.; Zurek, M.; Zyzak, M.; STAR_Collaboration

doi:10.1103/PhysRevC.110.014911

A search for

D^{0}

meson decays to the

π^{+} π^{-} e^{+} e^{-}

and

K^{+} K^{-} e^{+} e^{-}

final states is reported using a sample of proton-proton collisions collected by the LHCb experiment at a center-of-mass energy of 13 TeV, corresponding to an integrated luminosity of

6 {fb}^{- 1}

. The decay

D^{0} \to π^{+} π^{-} e^{+} e^{-}

is observed for the first time when requiring that the two electrons are consistent with coming from the decay of a

ϕ

or

ρ^{0} / ω

meson. The corresponding branching fractions are measured relative to the

D^{0} \to K^{-} π^{-} [e^{+} e^{-}]_{ρ^{0} / ω}

decay, where the two electrons are consistent with coming from the decay of a

ρ^{0}

or

ω

meson. No evidence is found for the

D^{0} \to K^{+} K^{-} e^{+} e^{-}

decay and world-best limits are set on its branching fraction. The results are compared to, and found to be consistent with, the branching fractions of the

D^{0} \to π^{+} π^{-} μ^{+} μ^{-}

and

D^{0} \to K^{+} K^{-} μ^{+} μ^{-}

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