Observation of a Broad L=1 $c\bar{q}$ State in $B^{-}\to D^{*+}\pi^{-}\pi^{-}$ at CLEO

TL;DR

This paper reports the observation of a broad L=1 charmed meson state in B- decays, providing measurements of its mass, width, and new B meson branching fractions, based on data from the CLEO experiment.

Contribution

First observation of a broad L=1 D meson state in B- decays, with preliminary measurements of its properties and new B meson branching fractions.

Findings

Observed a new broad D_J(1/2) state at ~2461 MeV

Measured the width of the state to be approximately 290 MeV

Determined several new branching fractions for charged B mesons

Abstract

Using 4.7 fb^-1 of data taken at CESR at energies at and near the Upsilon(4S) we have studied the decay B- -> D{*+}pi-pi- (and its conjugate). We observe a new, broad charmed meson state, which we interpret as D_J(j=1/2), in its decay to D{*+}pi-. Our preliminary results indicate the mass and width of this L=1 state to be m = (2461 +41/-3} +/-10 +/-32) MeV and Gamma = (290 +101/-79 +/-26 +/-36) MeV, with the third uncertainty associated with the parameterization of the relative strong phases. In addition we have measured several new branching fractions of charged B mesons. All quoted results are preliminary.