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Title: Probing the Higgs with angular observables at future e+e colliders

Abstract

In this paper, I summarize our recent works on using differential observables to explore the physics potential of future e+e colliders in the framework of Higgs effective field theory. This proceeding is based upon Refs. 1 and 2. We study angular observables in the e+e → ZHℓ+b$$\bar{b}$$ channel at future circular e+e colliders such as CEPC and FCC-ee. Taking into account the impact of realistic cut acceptance and detector effects, we forecast the precision of six angular asymmetries at CEPC (FCC-ee) with center-of-mass energy √s = 240 GeV and 5 (30) ab–1 integrated luminosity. We then determine the projected sensitivity to a range of operators relevant for the Higgsstrahlung process in the dimension-6 Higgs EFT. Our results show that angular observables provide complementary sensitivity to rate measurements when constraining various tensor structures arising from new physics. We further find that angular asymmetries provide a novel means of constraining the “blind spot” in indirect limits on supersymmetric scalar top partners. Finally, we also discuss the possibility of using ZZ-fusion at e+e machines at different energies to probe new operators.

Authors:
 [1]
  1. Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States). Theoretical Physics Dept.
Publication Date:
Research Org.:
Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1358111
Report Number(s):
FERMILAB-CONF-16-681-T
Journal ID: ISSN 0217-751X; 1501170
Grant/Contract Number:  
AC02-07CH11359
Resource Type:
Accepted Manuscript
Journal Name:
International Journal of Modern Physics A
Additional Journal Information:
Journal Volume: 31; Journal Issue: 33; Journal ID: ISSN 0217-751X
Publisher:
World Scientific
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; asymmetries; Higgs boson; collider; ILC; CEPC; FCC; EFT; higher-dimensional operators

Citation Formats

Liu, Zhen. Probing the Higgs with angular observables at future e+e– colliders. United States: N. p., 2016. Web. doi:10.1142/S0217751X1644005X.
Liu, Zhen. Probing the Higgs with angular observables at future e+e– colliders. United States. doi:10.1142/S0217751X1644005X.
Liu, Zhen. Mon . "Probing the Higgs with angular observables at future e+e– colliders". United States. doi:10.1142/S0217751X1644005X. https://www.osti.gov/servlets/purl/1358111.
@article{osti_1358111,
title = {Probing the Higgs with angular observables at future e+e– colliders},
author = {Liu, Zhen},
abstractNote = {In this paper, I summarize our recent works on using differential observables to explore the physics potential of future e+e– colliders in the framework of Higgs effective field theory. This proceeding is based upon Refs. 1 and 2. We study angular observables in the e+e– → ZHℓ+ℓ–b$\bar{b}$ channel at future circular e+e– colliders such as CEPC and FCC-ee. Taking into account the impact of realistic cut acceptance and detector effects, we forecast the precision of six angular asymmetries at CEPC (FCC-ee) with center-of-mass energy √s = 240 GeV and 5 (30) ab–1 integrated luminosity. We then determine the projected sensitivity to a range of operators relevant for the Higgsstrahlung process in the dimension-6 Higgs EFT. Our results show that angular observables provide complementary sensitivity to rate measurements when constraining various tensor structures arising from new physics. We further find that angular asymmetries provide a novel means of constraining the “blind spot” in indirect limits on supersymmetric scalar top partners. Finally, we also discuss the possibility of using ZZ-fusion at e+e– machines at different energies to probe new operators.},
doi = {10.1142/S0217751X1644005X},
journal = {International Journal of Modern Physics A},
number = 33,
volume = 31,
place = {United States},
year = {2016},
month = {10}
}

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