The D-s(+) -> K+K-mu (+)nu(mu) decay is studied based on 7.33 fb(-1)ofe+e-collisiondata collected with the BESIII detector at center-of-mass energies in the range from 4.128to 4.226 GeV. The absolute branching fraction is measured as B(D+s ->phi mu+nu mu) = (2.25 +/- 0.09 +/- 0.07)x10-2, the most precise measurement to date. Combining with the world average of B(D+s ->phi e+nu e), the ratio of the branching fractions obtained is B(D+s ->phi mu+nu mu)B(D+s ->phi e+nu e)=0.94 +/- 0.08, in agreement with lepton universality. By performing a partial wave analysis, the hadronic form factor ratios atq2= 0are extracted, finding rV=V(0)A1(0)= 1.58 +/- 0.17 +/- 0.02andr2=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 fromf0(980)-> K+K-is found. The upper limitB(D+s -> f0(980)mu+nu mu)B(f0(980)-> K+K-)<5.45x10-4is set at 90% credibility level

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

Garzia, I.;Gramigna, S.;Scodeggio, M.;
2023

Abstract

The D-s(+) -> K+K-mu (+)nu(mu) decay is studied based on 7.33 fb(-1)ofe+e-collisiondata collected with the BESIII detector at center-of-mass energies in the range from 4.128to 4.226 GeV. The absolute branching fraction is measured as B(D+s ->phi mu+nu mu) = (2.25 +/- 0.09 +/- 0.07)x10-2, the most precise measurement to date. Combining with the world average of B(D+s ->phi e+nu e), the ratio of the branching fractions obtained is B(D+s ->phi mu+nu mu)B(D+s ->phi e+nu e)=0.94 +/- 0.08, in agreement with lepton universality. By performing a partial wave analysis, the hadronic form factor ratios atq2= 0are extracted, finding rV=V(0)A1(0)= 1.58 +/- 0.17 +/- 0.02andr2=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 fromf0(980)-> K+K-is found. The upper limitB(D+s -> f0(980)mu+nu mu)B(f0(980)-> K+K-)<5.45x10-4is set at 90% credibility level
2023
Null, Null; Ablikim, M.; Achasov, M. N.; Adlarson, P.; Ai, X. C.; Aliberti, R.; Amoroso, A.; An, M. R.; An, Q.; Bai, Y.; Bakina, O.; Balossino, I.; Ba...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11392/2556670
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