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29 March 2024
 
  » arxiv » hep-ph/0108024

 Article overview


Information on $B o pi pi$ Provided by the Semileptonic Process $B o pi l u$
Zumin Luo ; Jonathan L. Rosner ;
Date 3 Aug 2001
Journal Phys.Rev. D65 (2002) 054027
Subject hep-ph
AbstractAnalysis of the present data on the semileptonic process $B o pi ell u$ indicates that they have not yet reached the precision to provide adequate information on the $B o pi$ form factor $F_+(q^2)$, which for $q^2 = m_pi^2$ is known to be related to the factorized color-favored (``$T$’’, or ``tree’’) contribution to $B^0 o pi^+ pi^-$. It is shown here that with around 500 $B o pi ell u$ events in which rate and spectrum are measured one can improve the accuracy of $T$ by a significant amount. A recent CLEO determination of the $D^* D pi$ coupling constant is compared with an earlier prediction, and its role in the description of the $B o pi$ form factors is noted. When combined with an estimate of the penguin amplitude (``$P$’’) obtained using flavor SU(3) symmetry from $B o K pi$ decays, information on $T$ allows one to gauge the effects of the penguin amplitude on extraction of the weak phase $alpha = phi_2$ from the time-dependent CP-violating rate asymmetry in $B^0 o pi^+ pi^-$. The constraint on $alpha$ implied by a recent experimental result on this asymmetry is described.
Source arXiv, hep-ph/0108024
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