Eur. Phys. J. C (2006) 47: 39-44
https://doi.org/10.1140/epjc/s2006-02563-1

Experimental Physics

Search for D⁺→φl⁺ν and measurement of the branching fraction for D⁺→φπ⁺

Received: 17 December 2005
Revised: 7 April 2006
Published online: 15 May 2006

Abstract

Using a data sample of integrated luminosity of about 33 pb^-1 collected around 3.773 GeV with the BESII detector at the BEPC collider, the semileptonic decays D⁺→φe⁺ν_e, D⁺→φμ⁺ν_μ and the hadronic decay D⁺→φπ⁺ are studied. The upper limits of the branching fractions are set to be BF(D⁺→φe⁺ν_e)<2.01% and BF(D⁺→φμ⁺ν_μ)<2.04% at the 90% confidence level. The ratio of the branching fractions for D⁺→φπ⁺ relative to D⁺→K^-π⁺π⁺ is measured to be 0.057±0.011±0.003. In addition, the branching fraction for D⁺→φπ⁺ is obtained to be (5.2±1.0±0.4)×10^-3.