Two-particle angular correlations in e+e- collisions to hadronic final states in two reference coordinates at Belle

Chen, Y. -C.; Lee, Y. -J.; Chang, P.; Adachi, I.; Aihara, H.; Al Said, S.; Asner, D. M.; Atmacan, H.; Aulchenko, V.; Aushev, T.; Ayad, R.; Babu, V.; Behera, P.; Belous, K.; Bennett, J.; Bessner, M.; Bhardwaj, V.; Bhuyan, B.; Bilka, T.; Bodrov, D.; Bonvicini, G.; Borah, J.; Bozek, A.; Bra??ko, M.; Branchini, P.; Budano, A.; Campajola, M.; ??ervenkov, D.; Chang, M. -C.; Chekelian, V.; Cheon, B. G.; Chilikin, K.; Cho, H. E.; Cho, K.; Cho, S. -J.; Choi, S. -K.; Choi, Y.; Choudhury, S.; Cinabro, D.; Das, S.; De Pietro, G.; Dhamija, R.; Di Capua, F.; Dingfelder, J.; Dole??al, Z.; Dong, T. V.; Epifanov, D.; Ferber, T.; Ferlewicz, D.; Fulsom, B. G.; Garg, R.; Gaur, V.; Gabyshev, N.; Garmash, A.; Giri, A.; Goldenzweig, P.; Graziani, E.; Gu, T.; Hadjivasiliou, C.; Hayasaka, K.; Hayashii, H.; Hedges, M. T.; Herrmann, D.; Hou, W. -S.; Hsu, C. -L.; Inami, K.; Ipsita, N.; Ishikawa, A.; Itoh, R.; Iwasaki, M.; Jacobs, W. W.; Jang, E. -J.; Jia, S.; Jin, Y.; Joo, K. K.; Kang, K. H.; Karyan, G.; Kawasaki, T.; Kiesling, C.; Kim, C. H.; Kim, D. Y.; Kim, K. -H.; Kim, Y. -K.; Kody??, P.; Korobov, A.; Korpar, S.; Kovalenko, E.; Kri??an, P.; Krokovny, P.; Kumar, M.; Kumar, R.; Kumara, K.; Kwon, Y. -J.; Lam, T.; Lange, J. S.; Lee, S. C.; Li, J.; L. K., Li; Li, Y.; Y. B., Li; Li Gioi, L.; Libby, J.; Lin, C. -W.; Lieret, K.; Liventsev, D.; Masuda, M.; Matsuda, T.; Maurya, S. K.; Meier, F.; Merola, M.; Miyabayashi, K.; Mizuk, R.; Mohanty, G. B.; Mrvar, M.; Mussa, R.; Nakao, M.; Natkaniec, Z.; Natochii, A.; Nayak, M.; Nisar, N. K.; Nishida, S.; Ogawa, S.; Ono, H.; Onuki, Y.; Oskin, P.; Pakhlova, G.; Pardi, S.; Park, H.; Park, S. -H.; Patra, S.; Paul, S.; Pedlar, T. K.; Pestotnik, R.; Piilonen, L. E.; Podobnik, T.; Prencipe, E.; Prim, M. T.; Rout, N.; Russo, G.; Sandilya, S.; Sangal, A.; Santelj, L.; Savinov, V.; Schnell, G.; Schwanda, C.; Seidl, R.; Seino, Y.; Senyo, K.; Sevior, M. E.; Shapkin, M.; Sharma, C.; Shen, C. P.; Shiu, J. -G.; Solovieva, E.; Stari??, M.; Stottler, Z. S.; Strube, J. F.; Sumihama, M.; Sumiyoshi, T.; Takizawa, M.; Tamponi, U.; Tanida, K.; Tenchini, F.; Trabelsi, K.; Uchida, M.; Uglov, T.; Unno, Y.; Uno, K.; Uno, S.; Urquijo, P.; van Tonder, R.; Varner, G.; Vinokurova, A.; Vossen, A.; Waheed, E.; Wang, E.; Wang, M. -Z.; Wang, X. L.; Watanabe, M.; Watanuki, S.; Won, E.; Yan, W.; Yang, S. B.; Yin, J. H.; Yuan, C. Z.; Yusa, Y.; Zhai, Y.; Zhang, Z. P.; Zhilich, V.; Zhukova, V.

doi:10.1007/jhep03(2023)171

We present the analysis of two-particle angular correlations using coordinate systems defined with the conventional beam axis and the event thrust axis, and propose the latter to be a useful representation for the correlation structure interpretation in the e+e− collision system. The e+e− collisions to hadronic final states at center-of-mass energies of √s=10.52 GeV and 10.58 GeV are recorded by the Belle detector at KEKB. In this paper, results on the first dataset are supplementary to the previous Belle publication (arXiv:2201.01694) while the latter one is the first two-particle correlation measurement at a collision energy on the Υ(4S) resonance and sensitive to its decay products. Measurements are reported as a function of the charged-particle multiplicity. Finally, a qualitative understanding of the correlation structure is discussed using a combination of Monte Carlo simulations and experimental data.