B_s --> D_(s)h(h)(h) Decays in LHCb

TL;DR

This paper presents the first measurements and the most precise ratio of branching fractions for certain B_s and B decays into D and h(h)(h) final states using early LHCb data, advancing understanding of these decay modes.

Contribution

It reports the first observations and the most precise measurements of specific B_s and B decay branching fraction ratios using LHCb data from 2010.

Findings

Most precise measurement of B(B^0-bar --> D^+K^-) / B(B0-bar --> D^+ pi^-)

First observations of B(B_s-bar --> D^0 K^{*0}) / B(B^0-bar --> D^0 rho^0) and B(B^- --> D^0 K^- pi^+ pi^-)/B(B^- --> D^0 pi^- pi^+ pi^- )

Quantitative ratios of branching fractions with associated uncertainties

Abstract

We report recent measurements from LHCb on $B_{(s)}\to D_{(s)}h(h)(h)$ decays using $\sim$35 pb$^{-1}$ of data collected in 2010. In brief, we measure the following ratios of branching fractions: B(B^0-bar --> D^+K^-) / B(B0-bar --> D^+ pi^-) = 0.0752 +- 0.0064 +- 0.0026 B(B_s-bar --> D^0 K^{*0}) / B(B^0-bar --> D^0 rho^0) = 1.39 +- 0.31 +- 0.17 +- 0.18 B(B^0-bar --> D^+ K^- pi^+ pi^-) / B(B^0-bar --> D^+ pi^- pi^+ pi^-) = 0.052 +- 0.009 +- 0.005 B(B^- --> D^0 K^- pi^+ pi^-) / B(B^- --> D^0 pi^- pi^+ pi^-) = 0.096 +- 0.015 +- 0.008, where the uncertainties are statistical and systematic, respectively. The first of these measurements is the most precise to date, and the others are first observations.