Observation of the Semileptonic D^{+} Decay into the K[over ¯]_{1}(1270)^{0} Axial-Vector Meson. M Ablikim , M N Achasov , P Adlarson , S Ahmed , M Albrecht , M Alekseev , A Amoroso , F F An , Q An , Y Bai , O Bakina , R Baldini Ferroli , I Balossino , Y Ban , K Begzsuren , J V Bennett , N Berger , M Bertani , D Bettoni , F Bianchi , J Biernat , J Bloms , I Boyko , R A Briere , H Cai , X Cai , A Calcaterra , G F Cao , N Cao , S A Cetin , J Chai , J F Chang , W L Chang , G Chelkov , D Y Chen , G Chen , H S Chen , J C Chen , M L Chen , S J Chen , Y B Chen , W Cheng , G Cibinetto , F Cossio , X F Cui , H L Dai , J P Dai , X C Dai , A Dbeyssi , D Dedovich , Z Y Deng , A Denig , I Denysenko , M Destefanis , F De Mori , Y Ding , C Dong , J Dong , L Y Dong , M Y Dong , Z L Dou , S X Du , J Z Fan , J Fang , S S Fang , Y Fang , R Farinelli , L Fava , F Feldbauer , G Felici , C Q Feng , M Fritsch , C D Fu , Y Fu , Q Gao , X L Gao , Y Gao , Y G Gao , Z Gao , B Garillon , I Garzia , E M Gersabeck , A Gilman , K Goetzen , L Gong , W X Gong , W Gradl , M Greco , L M Gu , M H Gu , S Gu , Y T Gu 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, K Zhu , K J Zhu , S H Zhu , W J Zhu , X L Zhu , Y C Zhu , Y S Zhu , Z A Zhu , J Zhuang , B S Zou , J H Zou PHYSICAL REVIEW LETTERS（2019）
摘要
By analyzing a 2.93 fb(-1) data sample of e(+)e(-) collisions, recorded at a center-of-mass energy of 3.773 GeV with the BESIII detector operated at the BEPCII collider, we report the first observation of the semileptonic D+ transition into the axial-vector meson D+ -> (K) over bar (1) (1270)(0)e(+)nu(e) with a statistical significance greater than 10 sigma. Its decay branching fraction is determined to be B[D+ -> (K) over bar (1) (1270)(0)e(+)nu(e)] = (2.30 +/- 0.26(-0.21)(+0.18) +/- 0.25) x 10(-3), where the first and second uncertainties are statistical and systematic, respectively, and the third originates from the input branching fraction of (K) over bar (1)(1270)(0) -> K-pi(+)pi(0).
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