Observation of the Decay B0 => rho+ rho- and Measurement of the Branching Fraction and Polarization

Preprint

7 November 2003

preprint
Published by arXiv in arXiv

https://doi.org/10.48550/arXiv.hep-ex/0311017

Abstract

We have observed the rare decay B0 => rho+ rho- in a sample of 89 million BB pairs recorded with the BABAR detector. The number of observed events is 88 +23-21 +-9, with a significance of 5.1 standard deviations with systematic uncertainties included. The branching fraction and the longitudinal polarization are measured to be BR(B0 => rho+ rho-) = (25 +7-6 +5-6)*10^{-6} and Gamma_L/Gamma = 0.98 +0.02-0.08 +-0.03, respectively.

Keywords

LONGITUDINAL POLARIZATION
BRANCHING FRACTION
UNCERTAINTIES
POLARIZATION
STANDARD
DECAY B0
RHO

All Related Versions

Version 1, 2003-11-07, ArXiv
Version 1, 2003-08-08, ArXiv (Unconfirmed version)
Version 2, 2003-08-09, ArXiv (Unconfirmed version)
Published version: Physical Review D, 69 (3), 031102.

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