Transverse tau polarization in inclusive B → τ ν X decays

Yuval Grossman; Zoltan Ligeti

doi:10.1016/0370-2693(95)00070-2

Transverse tau polarization in inclusive B → τ ν X decays

Yuval Grossman, Zoltan Ligeti

Research output: Contribution to journal › Article › peer-review

21 Scopus citations

Abstract

We calculate, in the framework of multi Higgs doublet models, the CP violating transverse tau polarization, P_τ, in inclusive semileptonic B meson decays. We find that P_τ diverges at O( 1 m_b²) of the heavy quark expansion. We discuss the physical reasons for this divergence and show how to regularize it. We find large 1 m_b² corrections that can suppress the CP asymmetry by as much as 30%. The maximal allowed asymmetry is a_c ∼ 0.34. We discuss how the allowed range is expected to change in the future.

Original language	English
Pages (from-to)	399-404
Number of pages	6
Journal	Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume	347
Issue number	3-4
DOIs	https://doi.org/10.1016/0370-2693(95)00070-2
State	Published - 23 Mar 1995
Externally published	Yes

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.

Funding

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.

Funders	Funder number
U.S. Department of Energy	DE-FG03-92-ER 40701

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title = "Transverse tau polarization in inclusive B → τ ν X decays",

abstract = "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.",

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AB - 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.

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Transverse tau polarization in inclusive B → τ ν X decays

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