Measurement of branching fractions for B → J/ψηK decays and search for a narrow resonance in the J/ψη final state

T Iwashita; K Miyabayashi; V Bhardwaj; I Adachi; H Aihara; DM Asner; T Aushev; AM Bakich; A Bala; B Bhuyan; G Bonvicini; A Bozek; M Bračko; TE Browder; MC Chang; A Chen; BG Cheon; K Chilikin; R Chistov; K Cho; V Chobanova; SK Choi; Y Choi; D Cinabro; J Dalseno; M Danilov; Z Doležal; Z Drásal; D Dutta; S Eidelman; S Esen; H Farhat; JE Fast; M Feindt; T Ferber; A Frey; V Gaur; N Gabyshev; S Ganguly; R Gillard; YM Goh; B Golob; J Haba; T Hara; K Hayasaka; H Hayashii; T Higuchi; Y Horii; Y Hoshi; WS Hou; HJ Hyun; T Iijima; A Ishikawa; R Itoh; Y Iwasaki; I Jaegle; T Julius; DH Kah; JH Kang; E Kato; T Kawasaki; H Kichimi; C Kiesling; DY Kim; HJ Kim; HO Kim; JB Kim; JH Kim; MJ Kim; YJ Kim; K Kinoshita; J Klucar; BR Ko; P Kodyšs; S Korpar; P Križan; P Krokovny; T Kuhr; T Kumita; A Kuzmin; YJ Kwon; JS Lange; SH Lee; Y Li; J Libby; C Liu; Y Liu; P Lukin; D Matvienko; H Miyata; R Mizuk; A Moll; T Mori; Y Nagasaka; E Nakano; M Nakao; H Nakazawa; Z Natkaniec; M Nayak; C Ng

Journal article

Measurement of branching fractions for B → J/ψηK decays and search for a narrow resonance in the J/ψη final state

T Iwashita, K Miyabayashi, V Bhardwaj, I Adachi, H Aihara, DM Asner, T Aushev, AM Bakich, A Bala, B Bhuyan, G Bonvicini, A Bozek, M Bračko, TE Browder, MC Chang, A Chen, BG Cheon, K Chilikin, R Chistov, K Cho Show all

Progress of Theoretical and Experimental Physics | Published : 2014

DOI: 10.1093/ptep/ptu043

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Abstract

We report an observation of the B±→ J/ψηK± and B0 → J/ψηK0S decays using 772 × 106BB¯ pairs collected at the γ(4S) resonance with the Belle detector at the KEKB asymmetric-energy e+e- collider. We obtain the branching fractions B(B?→ J/ψηK±) = (1.27 ±0.11(stat.) ±0.11(syst.)) ×10-4 and B(B0 → J/ψηK0 S ) = (5.22 ±0.78(stat.) ± 0.49(syst.)) ×10-5. We search for a new narrow charmonium(-like) state X in the J/ψη mass spectrum and find no significant excess. We set upper limits on the product of branching fractions, B(B±→ X K± )B(X → J/ψη), at 3872MeVc-2 where aC-odd partner of X(3872) may exist, at ψ(4040) and ψ(4160) assuming their known mass and width, and over a range from 3.8 to 4.8 GeV c-2..

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University of Melbourne Researchers

Martin Sevior Author

Phillip Urquijo Author

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Funding Acknowledgements

We thank the KEKB group for excellent operation of the accelerator; the KEK cryogenics group for efficient solenoid operations; and the KEK computer group, the NII, and PNNL/EMSL for valuable computing and SINET4 network support. We acknowledge support from MEXT, JSPS, and Nagoya's TLPRC (Japan); ARC and DIISR (Australia); FWF (Austria); NSFC (China); MSMT (Czechia); CZF, DFG, and VS (Germany); DST (India); INFN (Italy); MEST, NRF, GSDC of KISTI, and WCU (Korea); MNiSW and NCN (Poland); MES and RFAAE (Russia); ARRS (Slovenia); IKERBASQUE and UPV/EHU (Spain); SNSF (Switzerland); NSC and MOE (Taiwan); and DOE and NSF (USA). This work is partly supported by Grant-in-Aid from MEXT for Scientific Research on Innovative Areas ("Elucidation of New Hadrons with a Variety of Flavors").