TY - JOUR

T1 - Observation of D+→f0(500)μ+νμ and study of D+→π+π−ℓ+νℓ decay dynamics

AU - BESIII Collaboration

AU - Ablikim, M.

AU - Achasov, M. n.

AU - Adlarson, P.

AU - Afedulidis, O.

AU - Ai, X. c.

AU - Aliberti, R.

AU - Amoroso, A.

AU - An, Q.

AU - Bai, Y.

AU - Bakina, O.

AU - Balossino, I.

AU - Ban, Y.

AU - Bao, H.-R.

AU - Batozskaya, V.

AU - Begzsuren, K.

AU - Berger, N.

AU - Berlowski, M.

AU - Bertani, M.

AU - Bettoni, D.

AU - Bianchi, F.

AU - Bianco, E.

AU - Bortone, A.

AU - Briere, R. a.

AU - Brueggemann, A.

AU - Cai, H.

AU - Cai, X.

AU - Николаев, Иван Борисович

AU - Мучной, Николай Юрьевич

PY - 2024/11/13

Y1 - 2024/11/13

N2 - Using 2.93 fb-1 of e+e- collision data collected with the BESIII detector at the center-of-mass energy of 3.773 GeV, we investigate the semileptonic decays D+→π+π-ℓ+ν ℓ (ℓ=e and μ). The D+→f0(500)μ+νμ decay is observed for the first time. By analyzing simultaneously the differential decay rates of D+→f0(500)μ+νμ and D+→f0(500)e+νe in different ℓ+ν ℓ four-momentum transfer intervals, the product of the relevant hadronic form factor f+f0(0) and the magnitude of the c→d Cabibbo-Kobayashi-Maskawa matrix element |Vcd| is determined to be f+f0(0)|Vcd|=0.143±0.014stat±0.011syst for the first time. With the input of |Vcd| from the global fit in the standard model, we determine f+f0(0)=0.63±0.06stat±0.05syst. The absolute branching fractions of D+→f0(500)(π+π-)μ+νμ and D+→ρ(π+π-)0μ+νμ are determined as (0.72±0.13stat±0.08syst)×10-3 and (1.64±0.13stat±0.10syst)×10-3. Combining these results with those of previous BESIII measurements on their semielectronic counterparts from the same data sample, we test lepton flavor universality by measuring the branching fraction ratios BD+→ρ0μ+νμ/BD+→ρ0e+νe=0.88±0.10 and BD+→f0(500)μ+νμ/BD+→f0(500)e+νe=1.14±0.26, which are compatible with the standard model expectation.

AB - Using 2.93 fb-1 of e+e- collision data collected with the BESIII detector at the center-of-mass energy of 3.773 GeV, we investigate the semileptonic decays D+→π+π-ℓ+ν ℓ (ℓ=e and μ). The D+→f0(500)μ+νμ decay is observed for the first time. By analyzing simultaneously the differential decay rates of D+→f0(500)μ+νμ and D+→f0(500)e+νe in different ℓ+ν ℓ four-momentum transfer intervals, the product of the relevant hadronic form factor f+f0(0) and the magnitude of the c→d Cabibbo-Kobayashi-Maskawa matrix element |Vcd| is determined to be f+f0(0)|Vcd|=0.143±0.014stat±0.011syst for the first time. With the input of |Vcd| from the global fit in the standard model, we determine f+f0(0)=0.63±0.06stat±0.05syst. The absolute branching fractions of D+→f0(500)(π+π-)μ+νμ and D+→ρ(π+π-)0μ+νμ are determined as (0.72±0.13stat±0.08syst)×10-3 and (1.64±0.13stat±0.10syst)×10-3. Combining these results with those of previous BESIII measurements on their semielectronic counterparts from the same data sample, we test lepton flavor universality by measuring the branching fraction ratios BD+→ρ0μ+νμ/BD+→ρ0e+νe=0.88±0.10 and BD+→f0(500)μ+νμ/BD+→f0(500)e+νe=1.14±0.26, which are compatible with the standard model expectation.

UR - https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85209690817&origin=inward

U2 - 10.1103/PhysRevD.110.092008

DO - 10.1103/PhysRevD.110.092008

M3 - Article

VL - 110

JO - Physical Review D

JF - Physical Review D

SN - 2470-0010

IS - 9

M1 - 092008

ER -