@article{9e582ac7f88043d386feca0067f13cb0,
title = "Observation of D+ →f0 (500)e+νe and Improved Measurements of D →ρe+νe",
abstract = "Using a data sample corresponding to an integrated luminosity of 2.93 fb-1 recorded by the BESIII detector at a center-of-mass energy of 3.773 GeV, we present an analysis of the decays D0→π-π0e+νe and D+→π-π+e+νe. By performing a partial wave analysis, the π+π-S-wave contribution to D+→π-π+e+νe is observed to be (25.7±1.6±1.1)% with a statistical significance greater than 10σ, besides the dominant P-wave contribution. This is the first observation of the S-wave contribution. We measure the branching fractions B(D0→ρ-e+νe)=(1.445±0.058±0.039)×10-3, B(D+→ρ0e+νe)=(1.860±0.070±0.061)×10-3, and B(D+→f0(500)e+νe,f0(500)→π+π-)=(6.30±0.43±0.32)×10-4. An upper limit of B(D+→f0(980)e+νe,f0(980)→π+π-)<2.8×10-5 is set at the 90% confidence level. We also obtain the hadronic form factor ratios of D→ρe+νe at q2=0 assuming the single-pole dominance parametrization: rV={[V(0)]/[A1(0)]}=1.695±0.083±0.051, r2={[A2(0)]/[A1(0)]}=0.845±0.056±0.039.",
author = "{BESIII Collaboration} and M. Ablikim and Achasov, {M. N.} and S. Ahmed and M. Albrecht and M. Alekseev and A. Amoroso and An, {F. F.} and Q. An and Y. Bai and O. Bakina and {Baldini Ferroli}, R. and Y. Ban and K. Begzsuren and Bennett, {D. W.} and Bennett, {J. V.} and N. Berger and M. Bertani and D. Bettoni and F. Bianchi and E. Boger and I. Boyko and Briere, {R. A.} and H. Cai and X. Cai and A. Calcaterra and Cao, {G. F.} and Cetin, {S. A.} and J. Chai and Chang, {J. F.} and Chang, {W. L.} and G. Chelkov and G. Chen and Chen, {H. S.} and Chen, {J. C.} and Chen, {M. L.} and Chen, {P. L.} and Chen, {S. J.} and Chen, {X. R.} and Chen, {Y. B.} and W. Cheng and Chu, {X. K.} and G. Cibinetto and F. Cossio and Dai, {H. L.} and Dai, {J. P.} and A. Dbeyssi and D. Dedovich and Deng, {Z. Y.} and A. Denig and I. Denysenko",
note = "Publisher Copyright: {\textcopyright} 2019 authors. Published by the American Physical Society. Published by the American Physical Society under the terms of the {"}https://creativecommons.org/licenses/by/4.0/{"} Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI. Funded by SCOAP . ",
year = "2019",
month = feb,
day = "13",
doi = "10.1103/PhysRevLett.122.062001",
language = "English",
volume = "122",
journal = "Physical Review Letters",
issn = "0031-9007",
publisher = "American Physical Society",
number = "6",
}