Evidence of hb(2P)→(1S)η Decay and Search for hb(1P,2P)→(1S)π0 with the Belle Detector

E Kovalenko; I Adachi; H Aihara; DM Asner; T Aushev; R Ayad; V Babu; S Banerjee; K Belous; J Bennett; M Bessner; T Bilka; D Biswas; A Bobrov; D Bodrov; A Bondar; A Bozek; M Bračko; P Branchini; TE Browder; A Budano; M Campajola; MC Chang; BG Cheon; K Chilikin; HE Cho; K Cho; SJ Cho; SK Choi; Y Choi; S Choudhury; N Dash; G De Nardo; G De Pietro; R Dhamija; F Di Capua; Z DoleŽal; TV Dong; S Dubey; P Ecker; D Epifanov; D Ferlewicz; BG Fulsom; R Garg; V Gaur; A Garmash; A Giri; P Goldenzweig; E Graziani; T Gu; Y Guan; K Gudkova; C Hadjivasiliou; T Hara; K Hayasaka; S Hazra; WS Hou; CL Hsu; K Inami; N Ipsita; A Ishikawa; R Itoh; M Iwasaki; WW Jacobs; Y Jin; T Kawasaki; C Kiesling; CH Kim; DY Kim; KH Kim; YK Kim; K Kinoshita; P Kodyš; A Korobov; S Korpar; P KriŽan; P Krokovny; T Kuhr; R Kumar; K Kumara; A Kuzmin; YJ Kwon; YT Lai; T Lam; D Levit; LK Li; L Li Gioi; J Libby; D Liventsev; Y Ma; A Martini; M Masuda; T Matsuda; D Matvienko; F Meier; M Merola; K Miyabayashi; R Mizuk; GB Mohanty; R Mussa

Journal article

Evidence of hb(2P)→(1S)η Decay and Search for hb(1P,2P)→(1S)π0 with the Belle Detector

E Kovalenko, I Adachi, H Aihara, DM Asner, T Aushev, R Ayad, V Babu, S Banerjee, K Belous, J Bennett, M Bessner, T Bilka, D Biswas, A Bobrov, D Bodrov, A Bondar, A Bozek, M Bračko, P Branchini, TE Browder Show all

Physical Review Letters | Published : 2024

DOI: 10.1103/PhysRevLett.133.261901

Abstract

We report the first evidence for the hb(2P)→(1S)η transition with a significance of 3.5 standard deviations. The decay branching fraction is measured to be B[hb(2P)→(1S)η]=(7.1-3.2+3.7±0.8)×10-3, which is noticeably smaller than expected. We also set upper limits on π0 transitions of B[hb(2P)→(1S)π0]<1.8×10-3, and B[hb(1P)→(1S)π0]<1.8×10-3, at the 90% confidence level. These results are obtained with a 131.4 fb-1 data sample collected near the (5S) resonance with the Belle detector at the KEKB asymmetric-energy e+e- collider.