Search for h b ( 2 P ) → γ χ b J ( 1 P ) at s = 10.860     GeV

Boschetti, A.; Mussa, R.; Tamponi, U.; Adachi, I.; Aihara, H.; Asner, D. M.; Aushev, T.; Ayad, R.; Banerjee, Sw.; Belous, K.; Bennett, J.; Bessner, M.; Biswas, D.; Bobrov, A.; Bodrov, D.; Bozek, A.; Bračko, M.; Branchini, P.; Browder, T. E.; Budano, A.; Chang, M. -C.; Cheon, B. G.; Chilikin, K.; Cho, K.; Choi, S. -K.; Choi, Y.; Choudhury, S.; De Nardo, G.; De Pietro, G.; Dhamija, R.; Di Capua, F.; Doležal, Z.; Dong, T. V.; Ecker, P.; Epifanov, D.; Ferlewicz, D.; Fulsom, B. G.; Garg, R.; Gaur, V.; Garmash, A.; Giri, A.; Goldenzweig, P.; Graziani, E.; Gu, T.; Guan, Y.; Gudkova, K.; Hadjivasiliou, C.; Hara, T.; Hayasaka, K.; Hayashii, H.; Hazra, S.; Hou, W. -S.; Hsu, C. -L.; Inami, K.; Ipsita, N.; Itoh, R.; Iwasaki, M.; Jacobs, W. W.; Jin, Y.; Kawasaki, T.; Kiesling, C.; Kim, C. H.; Kim, D. Y.; Kim, K. -H.; Kim, Y. -K.; Kinoshita, K.; Kodyš, P.; Korpar, S.; Kovalenko, E.; Križan, P.; Krokovny, P.; Kumar, R.; Kumara, K.; Kwon, Y. -J.; Lam, T.; Levit, D.; Li, L. K.; Li, Y. B.; Li Gioi, L.; Liventsev, D.; Ma, Y.; Masuda, M.; Matsuda, T.; Matvienko, D.; Meier, F.; Merola, M.; Miyabayashi, K.; Mizuk, R.; Mohanty, G. B.; Nakao, M.; Natkaniec, Z.; Natochii, A.; Nayak, L.; Nayak, M.; Nishida, S.; Ogawa, S.; Ono, H.; Pakhlova, G.; Park, J.; Park, S. -H.; Passeri, A.; 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.; Santelj, L.; Savinov, V.; Schnell, G.; Schwanda, C.; Seino, Y.; Senyo, K.; Shan, W.; Shen, C. P.; Shiu, J. -G.; Sokolov, A.; Solovieva, E.; Starič, M.; Sumihama, M.; Takizawa, M.; Tanida, K.; Tenchini, F.; Tiwary, R.; Uchida, M.; Unno, Y.; Uno, S.; Vinokurova, A.; Wang, E.; Wang, M. -Z.; Wang, X. L.; Won, E.; Yabsley, B. D.; Yelton, J.; Yin, J. H.; Yook, Y.; Yuan, L.

doi:10.1103/PhysRevD.111.L011102

Search for $h_{b} (2 P) \to γ χ_{b J} (1 P)$ at $\sqrt{s} = 10.860 GeV$

Journal Article · Wed Jan 08 00:00:00 EST 2025 · Physical Review. D.

DOI:https://doi.org/10.1103/PhysRevD.111.L011102· OSTI ID:2497370

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In the bottomonium sector, the hindered magnetic dipole transitions between P-wave states $h_{b} (2 P) \to χ_{b J} (1 P) γ$ , $J = 0$ , 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% confidence level on the corresponding branching fractions: $B [h_{b} (2 P) \to γ χ_{b 0} (1 P)] < 2.7 \times 10^{- 1}$ , $B [h_{b} (2 P) \to γ χ_{b 1} (1 P)] < 5.4 \times 10^{- 3}$ and $B [h_{b} (2 P) \to γ χ_{b 2} (1 P)] < 1.3 \times 10^{- 2}$ . 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.

Published by the American Physical Society 2025

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Sponsoring Organization:: USDOE

OSTI ID:: 2497370

Journal Information:: Physical Review. D., Journal Name: Physical Review. D. Journal Issue: 1 Vol. 111; ISSN PRVDAQ; ISSN 2470-0010

Publisher:: American Physical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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