BES Results on Inclusive D Meson Decays

TL;DR

This paper reports a preliminary measurement of the branching fractions of D0 and D+ mesons decaying into phi mesons using BES detector data, providing initial estimates and upper limits for these decay modes.

Contribution

It presents the first measurement of D meson decays into phi mesons at BEPC, with specific branching fraction values and upper limits based on 22.3 pb-1 data.

Findings

Measured B(D->phiX) = (1.29±0.51±0.12)%

Set upper limits: B(D0->phiX)<2.5%, B(D+->phiX)<5.0%, B(D+->phie+X)<1.6%

Data sample of 22.3 pb-1 at 4.03 GeV used

Abstract

A preliminary measurement of branching fractions of the D0 and D+ mesons into the phi meson is reported. The result is based on a data sample of 22.3 pb-1 collected at the CM energy of 4.03 GeV with the BES detector operated at the BEPC e+e- storage ring. From tagged D\bar{D} pair events the average branching fraction for a mixture of D0 and D+ is determined to be B(D->phiX)= (1.29+-0.51+-0.12)%. Upper limits at 90% confidence level are set to be B(D0->phiX)<2.5%, B(D+->phiX)<5.0%, and B(D+->phie+X)<1.6%.