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Title: Probing CP violation in e+e- production of the Higgs boson and toponia

Abstract

We study the CP violation in the Higgs boson and toponia production process at the ILC where the toponia are produced near the threshold. With the approximation that the production vertex of the Higgs boson and toponia is contact, and neglecting the P-wave toponia, we analytically calculated the density matrix for the production and decay of the toponia. Under these assumptions, the production spectrum of the toponia is solely determined by the spin quantum number, therefore the toponia can be either singlet or triplet. We find that the production rate of the singlet toponium is highly suppressed, and behaves just like the production of a P-wave toponia. In the case of the triplet toponium, three completely independent CP observables, namely azimuthal angles of lepton and antilepton in the toponium rest-frame as well as their sum, are predicted based on our analytical results, and checked by using the tree-level event generator. The non-trivial correlations come from the longitudinal-transverse interferences for the azimuthal angles of leptons, and the transverse-transverse interference for their sum. These three observables are well defined at the ILC, where the rest frame of the toponium can be reconstructed directly. Furthermore, the QCD-strong corrections, which are important near themore » threshold region, are also studied with the approximation of spin-independent QCD-Coulomb potential. While the total cross section is enhanced, the spin correlations predicted in this paper are not affected.« less

Authors:
 [1];  [2];  [3]
  1. High Energy Accelerator Research Organization (KEK), Tsukuba (Japan); Sokendai, Tsukuba (Japan); Univ. of Wisconsin, Madison, WI (United States)
  2. High Energy Accelerator Research Organization (KEK), Tsukuba (Japan); Sokendai, Tsukuba (Japan); Shaanxi Univ. of Technology, Hanzhong (China)
  3. High Energy Accelerator Research Organization (KEK), Tsukuba (Japan)
Publication Date:
Research Org.:
Univ. of Wisconsin, Madison, WI (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1438011
Grant/Contract Number:  
fg02-95ER40896
Resource Type:
Accepted Manuscript
Journal Name:
Journal of High Energy Physics (Online)
Additional Journal Information:
Journal Name: Journal of High Energy Physics (Online); Journal Volume: 2016; Journal Issue: 6; Journal ID: ISSN 1029-8479
Publisher:
Springer Berlin
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; Beyond Standard Model; CP violation; Higgs Physics

Citation Formats

Hagiwara, Kaoru, Ma, Kai, and Yokoya, Hiroshi. Probing CP violation in e+e- production of the Higgs boson and toponia. United States: N. p., 2016. Web. doi:10.1007/JHEP06(2016)048.
Hagiwara, Kaoru, Ma, Kai, & Yokoya, Hiroshi. Probing CP violation in e+e- production of the Higgs boson and toponia. United States. doi:10.1007/JHEP06(2016)048.
Hagiwara, Kaoru, Ma, Kai, and Yokoya, Hiroshi. Wed . "Probing CP violation in e+e- production of the Higgs boson and toponia". United States. doi:10.1007/JHEP06(2016)048. https://www.osti.gov/servlets/purl/1438011.
@article{osti_1438011,
title = {Probing CP violation in e+e- production of the Higgs boson and toponia},
author = {Hagiwara, Kaoru and Ma, Kai and Yokoya, Hiroshi},
abstractNote = {We study the CP violation in the Higgs boson and toponia production process at the ILC where the toponia are produced near the threshold. With the approximation that the production vertex of the Higgs boson and toponia is contact, and neglecting the P-wave toponia, we analytically calculated the density matrix for the production and decay of the toponia. Under these assumptions, the production spectrum of the toponia is solely determined by the spin quantum number, therefore the toponia can be either singlet or triplet. We find that the production rate of the singlet toponium is highly suppressed, and behaves just like the production of a P-wave toponia. In the case of the triplet toponium, three completely independent CP observables, namely azimuthal angles of lepton and antilepton in the toponium rest-frame as well as their sum, are predicted based on our analytical results, and checked by using the tree-level event generator. The non-trivial correlations come from the longitudinal-transverse interferences for the azimuthal angles of leptons, and the transverse-transverse interference for their sum. These three observables are well defined at the ILC, where the rest frame of the toponium can be reconstructed directly. Furthermore, the QCD-strong corrections, which are important near the threshold region, are also studied with the approximation of spin-independent QCD-Coulomb potential. While the total cross section is enhanced, the spin correlations predicted in this paper are not affected.},
doi = {10.1007/JHEP06(2016)048},
journal = {Journal of High Energy Physics (Online)},
number = 6,
volume = 2016,
place = {United States},
year = {2016},
month = {6}
}

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Figures / Tables:

Figure 1 Figure 1: Feynman diagrams which contribute to the $B$ − $htt̄$ effective vertex (labeled by a big gray dot) in the threshold region.

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