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 Pwave 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 Pwave toponia. In the case of the triplet toponium, three completely independent CP observables, namely azimuthal angles of lepton and antilepton in the toponium restframe as well as their sum, are predicted based on our analytical results, and checked by using the treelevel event generator. The nontrivial correlations come from the longitudinaltransverse interferences for the azimuthal angles of leptons, and the transversetransverse 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 QCDstrong corrections, which are important near themore »
 Authors:

 High Energy Accelerator Research Organization (KEK), Tsukuba (Japan); Sokendai, Tsukuba (Japan); Univ. of Wisconsin, Madison, WI (United States)
 High Energy Accelerator Research Organization (KEK), Tsukuba (Japan); Sokendai, Tsukuba (Japan); Shaanxi Univ. of Technology, Hanzhong (China)
 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:
 fg0295ER40896
 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 10298479
 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 Pwave 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 Pwave toponia. In the case of the triplet toponium, three completely independent CP observables, namely azimuthal angles of lepton and antilepton in the toponium restframe as well as their sum, are predicted based on our analytical results, and checked by using the treelevel event generator. The nontrivial correlations come from the longitudinaltransverse interferences for the azimuthal angles of leptons, and the transversetransverse 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 QCDstrong corrections, which are important near the threshold region, are also studied with the approximation of spinindependent QCDCoulomb 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}
}
Web of Science
Figures / Tables:
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