First measurement of Γ(D(s)(+) → μ+ν) / Γ(D(s)(+) → φ π+)

• Main Authors: Acosta, D., THULASIDAS, Manoj
• Format: text
• Language: English
• Published: Institutional Knowledge at Singapore Management University 1994
• Subjects: Physics
• Online Access: https://ink.library.smu.edu.sg/sis_research/3512; http://doi.org/10.1103/PhysRevD.49.5690
• Institution: Singapore Management University

We present a measurement of Γ(D+s→μ+ν) / (D+s→φπ+)=0.245±0.052±0.074. Using this ratio and B(D+s→φπ+)=(3.7±0.9)% we extract fDs=344±37±52±42 MeV, where the last error is due to the uncertainty in the D+s→φπ+ absolute branching ratio. This result is larger than most theoretical predictions....