Prospect for measuring the CP phase in the $$h\tau\tau$$ coupling at the LHC
Abstract
The search for a new source of CP violation is one of the most important endeavors in particle physics. A particularly interesting way to perform this search is to probe the CP phase in the $$h\tau\tau$$ coupling, as the phase is currently completely unconstrained by all existing data. Recently, a novel variable $$\Theta$$ was proposed for measuring the CP phase in the $$h\tau\tau$$ coupling through the $$\tau^\pm \to \pi^\pm \pi^0 \nu$$ decay mode. We examine two crucial questions that the real LHC detectors must face, namely, the issue of neutrino reconstruction and the effects of finite detector resolution. For the former, we find strong evidence that the collinear approximation is the best for the $$\Theta$$ variable. For the latter, we find that the angular resolution is actually not an issue even though the reconstruction of $$\Theta$$ requires resolving the highly collimated $$\pi^\pm$$'s and $$\pi^0$$'s from the $$\tau$$ decays. Instead, we find that it is the missing transverse energy resolution that significantly limits the LHC reach for measuring the CP phase via $$\Theta$$.
- Authors:
-
- Florida State Univ., Tallahassee, FL (United States)
- Florida State Univ., Tallahassee, FL (United States); Syracuse Univ., NY (United States)
- Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States); Florida State Univ., Tallahassee, FL (United States)
- Publication Date:
- Research Org.:
- Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Nuclear Physics (NP)
- OSTI Identifier:
- 1178626
- Alternate Identifier(s):
- OSTI ID: 1181337
- Report Number(s):
- JLAB-THY-15-2000; DOE/OR/23177-3267; arXiv:1501.03156
Journal ID: ISSN 1550-7998; PRVDAQ; ArticleNumber: 075014; FG02-13ER41942; TRN: US1601140
- Grant/Contract Number:
- AC05-06OR23177; FG02-13ER41942
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physical Review. D, Particles, Fields, Gravitation and Cosmology
- Additional Journal Information:
- Journal Volume: 91; Journal Issue: 7; Journal ID: ISSN 1550-7998
- Publisher:
- American Physical Society (APS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; 46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
Citation Formats
Askew, Andrew, Jaiswal, Prerit, Okui, Takemichi, Prosper, Harrison B., and Sato, Nobuo. Prospect for measuring the CP phase in the $h\tau\tau$ coupling at the LHC. United States: N. p., 2015.
Web. doi:10.1103/PhysRevD.91.075014.
Askew, Andrew, Jaiswal, Prerit, Okui, Takemichi, Prosper, Harrison B., & Sato, Nobuo. Prospect for measuring the CP phase in the $h\tau\tau$ coupling at the LHC. United States. https://doi.org/10.1103/PhysRevD.91.075014
Askew, Andrew, Jaiswal, Prerit, Okui, Takemichi, Prosper, Harrison B., and Sato, Nobuo. Wed .
"Prospect for measuring the CP phase in the $h\tau\tau$ coupling at the LHC". United States. https://doi.org/10.1103/PhysRevD.91.075014. https://www.osti.gov/servlets/purl/1178626.
@article{osti_1178626,
title = {Prospect for measuring the CP phase in the $h\tau\tau$ coupling at the LHC},
author = {Askew, Andrew and Jaiswal, Prerit and Okui, Takemichi and Prosper, Harrison B. and Sato, Nobuo},
abstractNote = {The search for a new source of CP violation is one of the most important endeavors in particle physics. A particularly interesting way to perform this search is to probe the CP phase in the $h\tau\tau$ coupling, as the phase is currently completely unconstrained by all existing data. Recently, a novel variable $\Theta$ was proposed for measuring the CP phase in the $h\tau\tau$ coupling through the $\tau^\pm \to \pi^\pm \pi^0 \nu$ decay mode. We examine two crucial questions that the real LHC detectors must face, namely, the issue of neutrino reconstruction and the effects of finite detector resolution. For the former, we find strong evidence that the collinear approximation is the best for the $\Theta$ variable. For the latter, we find that the angular resolution is actually not an issue even though the reconstruction of $\Theta$ requires resolving the highly collimated $\pi^\pm$'s and $\pi^0$'s from the $\tau$ decays. Instead, we find that it is the missing transverse energy resolution that significantly limits the LHC reach for measuring the CP phase via $\Theta$.},
doi = {10.1103/PhysRevD.91.075014},
journal = {Physical Review. D, Particles, Fields, Gravitation and Cosmology},
number = 7,
volume = 91,
place = {United States},
year = {Wed Apr 01 00:00:00 EDT 2015},
month = {Wed Apr 01 00:00:00 EDT 2015}
}
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Works referencing / citing this record:
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