Limit on the B0->rho0rho0 Branching Fraction and Implications for the CKM Angle alpha
The BABAR Collaboration, B. Aubert et al
TL;DR
This paper sets an upper limit on the B0 -> rho0 rho0 decay rate, which constrains the penguin contributions affecting the precision of the CKM angle alpha measurement.
Contribution
It provides the first upper limit on the B0 -> rho0 rho0 branching fraction and discusses its implications for the CKM angle alpha determination.
Findings
No significant signal observed for B0 -> rho0 rho0 decay.
Upper limit of 1.1 x 10^-6 on the branching fraction at 90% CL.
Penguin contributions introduce an 11-degree uncertainty in alpha at 68% CL.
Abstract
We search for the decay B0 -> rho0 rho0 in a data sample of about 227 million Upsilon(4S)-> BBbar decays collected with the BABAR detector at the PEP-II asymmetric-energy e+e- collider at SLAC. We find no significant signal and set an upper limit of 1.1*10^-6 at 90% CL on the branching fraction. As a result, the uncertainty due to penguin contributions on the CKM unitarity angle alpha measured in B -> rho rho decays is 11 degrees at 68% CL.
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Taxonomy
TopicsParticle physics theoretical and experimental studies · High-Energy Particle Collisions Research · Quantum Chromodynamics and Particle Interactions