Accès ouvert déclaré
2024
preprint
Search for $h_b(2P)\toγχ_{bJ}(1P)$ at $\sqrt{s} = 10.860$ GeV
Belle Collaboration, A. Boschetti, R. Mussa, U. Tamponi, I. Adachi, H. Aihara, D. M. Asner, T. Aushev, R. Ayad, Sw. Banerjee, K. Belous, J. Bennett, M. Bessner, D. Biswas, A. Bobrov, D. Bodrov, A. Bożek, M. Bračko, P. Branchini, T. E. Browder, A. Budano, M. -C. Chang, B. G. Cheon, K. Chilikin, K. Cho, S. -K. Choi, Y. Choi, S. Choudhury, G. De Nardo, G. De Pietro, R. Dhamija, F. Di Capua, Z. Doležal, T. V. Dong, P. Ecker, D. Epifanov, D. Ferlewicz, B. G. Fulsom, Renu Garg, V. Gaur, A. Garmash, A. Giri, P. Goldenzweig, E. Graziani, T. Gu, Y. Guan, K. Gudkova, C. Hadjivasiliou, Takanori Hara, K. Hayasaka, H. Hayashii, S. Hazra, W.-S. Hou, C. -L. Hsu, K. Inami, N. Ipsita, R. Itoh, M. Iwasaki, W. W. Jacobs, Y. Jin, T. Kawasaki, C. Kiesling, C. H. Kim, D. Y. Kim, K. -H. Kim, Y. -K. Kim, K. Kinoshita, S. Korpar, E. Kovalenko, P. Križan, P. Krokovny, R. Kumar, K. Kumara, Y. -J. Kwon, T. Lam, D. Levit, L. K. Li, Yao Li, L. Li Gioi, D. Liventsev, Y. Ma, M. Masuda, T. Matsuda, D. Matvienko, F. Meier, M. Merola, K. Miyabayashi, R. Mizuk, G. B. Mohanty, M. Nakao, Z. Natkaniec, A. Natochii, L. Nayak, M. Nayak, S. Nishida, H. Ono, G. Pakhlova, J. Park, S. -H. Park, A. Passeri, S. Patra, S. Paul, T. K. Pedlar, L. E. Piilonen, T. Podobnik, E. Prencipe, M. T. Prim, N. Rout, G. Russo, S. Sandilya, L. Santelj, V. Savinov, G. Schnell, C. Schwanda, Y. Seino, K. Senyo, C. P. Shen, J. -G. Shiu, A. Sokolov, E. Solovieva, M. Starič, M. Sumihama, M. Takizawa, K. Tanida, F. Tenchini, R. Tiwary, M. Uchida, Y. Unno, S. Uno, A. Vinokurova, E. Wang, M.-Z. Wang, X. L. Wang, E. Won, B. Yabsley, J. Yelton, J. H. Yin, Y. Yook, L. Yuan
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Le résumé fourni par la source
In the bottomonium sector, the hindered magnetic dipole (M1) transitions between P-wave states $h_b(2P) \rightarrow χ_{bJ}(1P) γ$, $J=0, \, 1, \, 2$, are expected to be severely suppressed according to the Relativized Quark Model, due to the spin flip of the $b$ quark. Nevertheless, a recent model following the coupled-channel approach predicts the corresponding branching fractions to be enhanced by orders of magnitude. In this Letter, we report the first search for such transitions. We find no significant signals and set upper limits at 90% CL on the corresponding branching fractions: $\mathcal{B}[h_b(2P)\toγχ_{b0}(1P)] < 2.7 \times 10^{-1}$, $\mathcal{B}[h_b(2P)\toγχ_{b1}(1P)] < 5.4 \times 10^{-3}$ and $\mathcal{B}[h_b(2P)\toγχ_{b2}(1P)] < 1.3 \times 10^{-2}$. These values help to constrain the parameters of the coupled-channel models. The results are obtained using a $121.4 \, fb^{-1}$ data sample taken around $\sqrt{s}= 10.860 \, GeV$ with the Belle detector at the KEKB asymmetric-energy $e^+e^-$ collider.
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Les sujets associés
Particle physics theoretical and experimental studiesQuantum Chromodynamics and Particle InteractionsHigh-Energy Particle Collisions Research