Transverse tau polarization in inclusive B → τ ν X decays

Yuval Grossman, Zoltan Ligeti

Research output: Contribution to journalArticlepeer-review

21 Scopus citations


We calculate, in the framework of multi Higgs doublet models, the CP violating transverse tau polarization, Pτ, in inclusive semileptonic B meson decays. We find that Pτ diverges at O( 1 mb2) of the heavy quark expansion. We discuss the physical reasons for this divergence and show how to regularize it. We find large 1 mb2 corrections that can suppress the CP asymmetry by as much as 30%. The maximal allowed asymmetry is ac ∼ 0.34. We discuss how the allowed range is expected to change in the future.

Original languageEnglish
Pages (from-to)399-404
Number of pages6
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Issue number3-4
StatePublished - 23 Mar 1995
Externally publishedYes

Bibliographical note

Funding Information:
We thank Yossi Nir and Mark Wise for discussions and comments on the manuscript, Yael Shadmi and Neil Marcus for helpful conversations. Z.L. was supported in part by the U.S. Dept. of Energy under Grant no. DE-FG03-92-ER 40701.


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