Studies of the decay $$ {\textrm{D}}_{\textrm{s}}^{+}\to {\textrm{K}}^{+}{\textrm{K}}^{-}{\mu}^{+}{\nu}_{\mu } $$

Journal article

The Ds+→K+K−μ+νμ decay is studied based on 7.33 fb −1 of e + e − collision data collected with the BESIII detector at center-of-mass energies in the range from 4.128 to 4.226 GeV. The absolute branching fraction is measured as B(Ds+→ϕμ+νμ)=(2.25±0.09±0.07)×10−2 , the most precise measurement to date. Combining with the world average of B(Ds+→ϕe+νe) , the ratio of the branching fractions obtained is B(Ds+→ϕμ+νμ)B(Ds+→ϕe+νe)=0.94±0.08 , in agreement with lepton universality. By performing a partial wave analysis, the hadronic form factor ratios at q 2 = 0 are extracted, finding rV=V(0)A1(0)=1.58±0.17±0.02 and r2=A2(0)A1(0)=0.71±0.14±0.02 , where the first uncertainties are statistical and the second are systematic. No significant S-wave contribution from f 0(980) → K + K − is found. The upper limit B(Ds+→f0(980)μ+νμ)⋅B(f0(980)→K+K−)[removed]

Authors: Ablikim, M; Achasov, MN; Adlarson, P; Ai, XC; Aliberti, R

• Publication status: Published
• Peer review status: Peer reviewed
• Publisher: Springer
• Journal: Journal of High Energy Physics
• Volume: 2023
• Issue: 12
• Pages: 72
• Publication date: 2023-12-12
• DOI: 10.1007/jhep12(2023)072
• EISSN: 1029-8479
• ISSN: 1126-6708
• Language: English