Search for a doubly-charged DDK bound state in Υ(1S,2S) inclusive decays and via direct production in e+e− collisions at s√ = 10.520, 10.580, and 10.867 GeV

Li, Y.; Jia, S.; Shen, C. ???p.; Adachi, I.; Aihara, H.; Al Said, S.; Asner, D. ???m.; Aushev, T.; Ayad, R.; Babu, V.; Bahinipati, S.; Behera, P.; Belous, K.; Bennett, J.; Bessner, M.; Bhardwaj, V.; Bhuyan, B.; Bilka, T.; Biswal, J.; Bonvicini, G.; Bozek, A.; Bra??ko, M.; Browder, T. ???e.; Campajola, M.; ??ervenkov, D.; Chang, M. -C.; Chang, P.; Chen, A.; Cheon, B. ???g.; Chilikin, K.; Cho, K.; Cho, S. -J.; Choi, S. -K.; Choi, Y.; Choudhury, S.; Cinabro, D.; Cunliffe, S.; Das, S.; Dash, N.; De Nardo, G.; Di Capua, F.; Dingfelder, J.; Dole??al, Z.; Dong, T. ???v.; Eidelman, S.; Epifanov, D.; Ferber, T.; Fulsom, B. ???g.; Garg, R.; Gaur, V.; Garmash, A.; Giri, A.; Goldenzweig, P.; Guan, Y.; Hadjivasiliou, C.; Hartbrich, O.; Hayasaka, K.; Hayashii, H.; Hedges, M. ???t.; Hou, W. -S.; Hsu, C. -L.; Inami, K.; Inguglia, G.; Ishikawa, A.; Itoh, R.; Iwasaki, M.; Iwasaki, Y.; Jacobs, W. ???w.; Jeon, H. ???b.; Jin, Y.; Joo, C. ???w.; Joo, K. ???k.; Kaliyar, A. ???b.; Kang, K. ???h.; Karyan, G.; Kawasaki, T.; Kiesling, C.; Kim, D. ???y.; Kim, K. -H.; Kim, S. ???h.; Kim, Y. -K.; Kinoshita, K.; Kody??, P.; Konno, T.; Korpar, S.; Kotchetkov, D.; Kri??an, P.; Kroeger, R.; Krokovny, P.; Kuhr, T.; Kulasiri, R.; Kumar, M.; Kumar, R.; Kumara, K.; Kwon, Y. -J.; Lalwani, K.; Lange, J. ???s.; Lee, I. ???s.; Lee, S. ???c.; C. ???h., Li; Li, J.; L. ???k., Li; Y. ???b., Li; Li Gioi, L.; Libby, J.; Lieret, K.; Liptak, Z.; Macqueen, C.; Masuda, M.; Matsuda, T.; Matvienko, D.; Merola, M.; Miyabayashi, K.; Miyata, H.; Mizuk, R.; Mohanty, G. ???b.; Mohanty, S.; Mori, T.; Mussa, R.; Nakao, M.; Natkaniec, Z.; Natochii, A.; Nayak, L.; Nayak, M.; Niiyama, M.; Nisar, N. ???k.; Nishida, S.; Ono, H.; Onuki, Y.; Oskin, P.; Pakhlov, P.; Pakhlova, G.; Pang, T.; Pardi, S.; Park, H.; Park, S. -H.; Patra, S.; Paul, S.; Pedlar, T. ???k.; Pestotnik, R.; Piilonen, L. ???e.; Podobnik, T.; Popov, V.; Prencipe, E.; Prim, M. ???t.; Ritter, M.; R??hrken, M.; Rostomyan, A.; Rout, N.; Russo, G.; Sahoo, D.; Sakai, Y.; Sandilya, S.; Sangal, A.; Santelj, L.; Sanuki, T.; Savinov, V.; Schnell, G.; Schueler, J.; Schwanda, C.; Seino, Y.; Senyo, K.; Sevior, M. ???e.; Shapkin, M.; Sharma, C.; Shiu, J. -G.; Shwartz, B.; Sokolov, A.; Solovieva, E.; Stari??, M.; Stottler, Z. ???s.; Sumihama, M.; Sumisawa, K.; Sumiyoshi, T.; Sutcliffe, W.; Takizawa, M.; Tamponi, U.; Tanida, K.; Tenchini, F.; Uchida, M.; Uglov, T.; Unno, Y.; Uno, S.; Vahsen, S. ???e.; Van Tonder, R.; Varner, G.; Vinokurova, A.; Vorobyev, V.; Wang, C. ???h.; Wang, E.; Wang, M. -Z.; Wang, P.; Watanabe, M.; Watanuki, S.; Won, E.; Xu, X.; Yabsley, B. ???d.; Yan, W.; Yang, S. ???b.; Ye, H.; Yelton, J.; Yin, J. ???h.; Yuan, C. ???z.; Zhang, Z. ???p.; Zhilich, V.; Zhukova, V.; Zhulanov, V.

doi:10.1103/physrevd.102.112001

We report the results of a first search for a doubly-charged DDK bound state, denoted the R++, in Υ(1S) and Υ(2S) inclusive decays and via direct production in e+e− collisions at √s = 10.520, 10.580, and 10.867 GeV. The search uses data accumulated with the Belle detector at the KEKB asymmetric-energy e+e− collider. No significant signals are observed in the D+D∗+s invariant-mass spectra of all studied modes. The 90% credibility level upper limits on their product branching fractions in Υ(1S) and Υ(2S) inclusive decays (B(Υ(1S,2S)→R++ + anything)×B(R++→D+D∗+s)), and the product values of Born cross section and branching fraction in e+e− collisions (σ(e+e−→R++ + anything)×B(R++→D+D∗+s)) at √s = 10.520, 10.580, and 10.867 GeV under different assumptions of R++ masses varying from 4.13 to 4.17 GeV/c2, and widths varying from 0 to 5 MeV are obtained.