| Title: |
Observation of the Singly Cabibbo Suppressed Decay D 0 →b 1 (1235) - e + ν e and Evidence for D + →b 1 (1235) 0 e + ν e |
| Authors: |
Ablikim, M.; Achasov, M.N.; Adlarson, P.; Afedulidis, O.; Ai, X.C.; Aliberti, R.; Amoroso, A.; Kalantar-Nayestanaki, Nasser; Kavatsyuk, Myroslav; Messchendorp, Johan |
| Source: |
BESIII Collaboration, Ablikim, M, Achasov, M N, Adlarson, P, Afedulidis, O, Ai, X C, Aliberti, R, Amoroso, A, Kalantar-Nayestanaki, N, Kavatsyuk, M & Messchendorp, J 2026, 'Observation of the Singly Cabibbo Suppressed Decay D 0 →b 1 (1235) - e + ν e and Evidence for D + →b 1 (1235) 0 e + ν e', Physical Review Letters, vol. 136, 14701. https://doi.org/10.1103/4c4g-31zx |
| Publication Year: |
2026 |
| Collection: |
University of Groningen research database |
| Description: |
By analyzing a data sample of eþe− collisions with center-of-mass energy ffiffis p ¼ 3.773 GeV,corresponding to an integrated luminosity of 7.9 fb−1 collected with the BESIII detector operating at theBEPCII collider, we study semileptonic decays of the D0ðþÞ mesons into the axial-vector meson b1ð1235Þ viathe decay b1ð1235Þ → ωπ. The decay D0 → b1ð1235Þ−eþνe is observed with a significance of 5.2σ afterconsidering systematic uncertainty, while evidence for the decay Dþ → b1ð1235Þ0eþνe is obtained with a3.1σ significance. The product branching fractions are determined to be B½D0 → b1ð1235Þ−eþνe×B½b1ð1235Þ− → ωπ−¼ð0.72 0.18þ0.06 −0.08 Þ×10−4 and B½Dþ → b1ð1235Þ0eþνe×B½b1ð1235Þ0 → ωπ0 ¼ð1.16 0.44 0.16Þ×10−4, where the first uncertainties are statistical and the second systematic. The ratioof their partial decay widths is determined to be fΓ½D0 → b1ð1235Þ−eþνe=2Γ½Dþ → b1ð1235Þ0eþνeg ¼0.78 0.19þ0.04 −0.05 , which is consistent with unity, predicted by isospin invariance, within uncertainties. |
| Document Type: |
article in journal/newspaper |
| File Description: |
application/pdf |
| Language: |
English |
| ISSN: |
0031-9007; 1079-7114 |
| Relation: |
info:eu-repo/semantics/altIdentifier/hdl/https://hdl.handle.net/11370/e62ae546-4d4d-469b-ae6a-65c8d0ff838e; info:eu-repo/semantics/altIdentifier/pissn/0031-9007; info:eu-repo/semantics/altIdentifier/eissn/1079-7114 |
| DOI: |
10.1103/4c4g-31zx |
| Availability: |
https://hdl.handle.net/11370/e62ae546-4d4d-469b-ae6a-65c8d0ff838e; https://research.rug.nl/en/publications/e62ae546-4d4d-469b-ae6a-65c8d0ff838e; https://doi.org/10.1103/4c4g-31zx; https://pure.rug.nl/ws/files/1492809207/4c4g-31zx.pdf |
| Rights: |
info:eu-repo/semantics/openAccess ; http://creativecommons.org/licenses/by/4.0/ |
| Accession Number: |
edsbas.F14FDB65 |
| Database: |
BASE |