Evidence for B0->rho0rho0 Decay and Implications for the CKM Angle alpha

Preprint

12 February 2007

preprint
Published by arXiv in arXiv

https://doi.org/10.48550/arXiv.hep-ex/0612021

Abstract

We search for the decays B0->rho0rho0, B0->rho0f0, and B0->f0f0 in a sample of about 384 million Upsilon(4S)->BBbar decays collected with the BABAR detector at the PEP-II asymmetric-energy e+e- collider at SLAC. We find evidence for B0->rho0rho0 with 3.5 sigma significance and measure the branching fraction BR = (1.07+-0.33+-0.19)10^-6 and longitudinal polarization fraction f_L = 0.87+-0.13+-0.04, where the first uncertainty is statistical, and the second is systematic. The uncertainty on the CKM unitarity angle alpha due to penguin contributions in B-> rho rho decays is 18 degrees at the 1 sigma level. We also set upper limits on the B0->rho0f0 and B0->f0f0 decay rates.

Keywords

EVIDENCE FOR B0
UNCERTAINTY
ANGLE ALPHA
CKM ANGLE
RHO0RHO0
RHO0F0
DECAYS
F0F0

All Related Versions

Version 1, 2006-12-12, ArXiv
Version 2, 2007-02-12, ArXiv
Version 1, 2006-07-29, ArXiv (Unconfirmed version)
Published version: Physical Review Letters, 98 (11), 111801.

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