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Title: Measuring the CP property of Higgs coupling to tau leptons in the VBF channel at the LHC

Abstract

Here, we study the prospects of measuring the CP property of the Higgs (h) coupling to tau leptons using the vector boson fusion (VBF) production mode at the high-luminosity LHC. Utilizing the previously proposed angle between the planes spanned by the momentum vectors of the (π +π 0) and (π -π 0) pairs originating in τ ± decays as the CP-odd observable, we perform a detailed Monte Carlo analysis, taking into account the relevant standard model backgrounds, as well as detector resolution effects. We then found that excluding a pure CP-odd coupling hypothesis requires O(400 fb -1) luminosity at the 14TeV LHC, and values of the CP-mixing angle larger than about 25° can be excluded at 95% con fidence level using 3 ab -1 data. It is observed that the uncertainty in the angular resolution of the neutral pion momenta does not constitute a signifi cant hurdle. Achieving a signal to background ratio (S=B) close to one, while keeping a high enough signal yield required to study the angular distributions selects out VBF as a promising mode to probe the CP nature of the hττ coupling, with gluon fusion suffering from a low S=B, and the W ±h=Zh mode (withmore » leptonically decaying W ±=Z) having a much smaller signal rate.« less

Authors:
 [1];  [2];  [3];  [1]
  1. Univ. of Pittsburgh, PA (United States). Dept. of Physics and Astronomy; Tsinghua Univ., Beijing (China). Dept. of Physics
  2. Univ. of Pittsburgh, PA (United States). Dept. of Physics and Astronomy
  3. Harish-Chandra Research Inst., Allahabad (India)
Publication Date:
Research Org.:
Univ. of Wisconsin, Madison, WI (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1389301
Grant/Contract Number:  
FG02-95ER40896
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Journal of High Energy Physics (Online)
Additional Journal Information:
Journal Name: Journal of High Energy Physics (Online); Journal Volume: 2017; Journal Issue: 5; Journal ID: ISSN 1029-8479
Publisher:
Springer Berlin
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; Higgs Physics; CP violation

Citation Formats

Han, Tao, Mukhopadhyay, Satyanarayan, Mukhopadhyaya, Biswarup, and Wu, Yongcheng. Measuring the CP property of Higgs coupling to tau leptons in the VBF channel at the LHC. United States: N. p., 2017. Web. doi:10.1007/JHEP05(2017)128.
Han, Tao, Mukhopadhyay, Satyanarayan, Mukhopadhyaya, Biswarup, & Wu, Yongcheng. Measuring the CP property of Higgs coupling to tau leptons in the VBF channel at the LHC. United States. doi:10.1007/JHEP05(2017)128.
Han, Tao, Mukhopadhyay, Satyanarayan, Mukhopadhyaya, Biswarup, and Wu, Yongcheng. Tue . "Measuring the CP property of Higgs coupling to tau leptons in the VBF channel at the LHC". United States. doi:10.1007/JHEP05(2017)128. https://www.osti.gov/servlets/purl/1389301.
@article{osti_1389301,
title = {Measuring the CP property of Higgs coupling to tau leptons in the VBF channel at the LHC},
author = {Han, Tao and Mukhopadhyay, Satyanarayan and Mukhopadhyaya, Biswarup and Wu, Yongcheng},
abstractNote = {Here, we study the prospects of measuring the CP property of the Higgs (h) coupling to tau leptons using the vector boson fusion (VBF) production mode at the high-luminosity LHC. Utilizing the previously proposed angle between the planes spanned by the momentum vectors of the (π+π0) and (π-π0) pairs originating in τ± decays as the CP-odd observable, we perform a detailed Monte Carlo analysis, taking into account the relevant standard model backgrounds, as well as detector resolution effects. We then found that excluding a pure CP-odd coupling hypothesis requires O(400 fb-1) luminosity at the 14TeV LHC, and values of the CP-mixing angle larger than about 25° can be excluded at 95% con fidence level using 3 ab-1 data. It is observed that the uncertainty in the angular resolution of the neutral pion momenta does not constitute a signifi cant hurdle. Achieving a signal to background ratio (S=B) close to one, while keeping a high enough signal yield required to study the angular distributions selects out VBF as a promising mode to probe the CP nature of the hττ coupling, with gluon fusion suffering from a low S=B, and the W±h=Zh mode (with leptonically decaying W±=Z) having a much smaller signal rate.},
doi = {10.1007/JHEP05(2017)128},
journal = {Journal of High Energy Physics (Online)},
number = 5,
volume = 2017,
place = {United States},
year = {Tue May 23 00:00:00 EDT 2017},
month = {Tue May 23 00:00:00 EDT 2017}
}

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