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Title: Anomalous Z b b ¯ Couplings: From LEP to LHC

Abstract

The bottom quark forward-backward asymmetry ($$A^{b}_{FB}$$) data at LEP exhibits a long-standing discrepancy with the standard model prediction. We propose a novel method to probe the $$Zb\bar{b}$$ interactions through gg → Zh production at the LHC, which is sensitive to the axial-vector component of the $$Zb\bar{b}$$ couplings. The apparent degeneracy of the anomalous $$Zb\bar{b}$$ couplings implied by the LEP precision electroweak measurements seems to be resolved by the current 13 TeV LHC Zh data, which is, however, dominated by the two data points with high transverse momentum of Z boson whose central values are in conflict with the standard model prediction. We also show the potential of the HL-LHC to either verify or exclude the anomalous $$Zb\bar{b}$$ couplings observed at LEP through measuring the Zh production rate at the HL-LHC, and this conclusion is not sensitive to the possible new physics contribution induced by top quark or Higgs boson anomalous couplings in the loop.

Authors:
ORCiD logo;
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Michigan State Univ., East Lansing, MI (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Nuclear Physics (NP); USDOE Laboratory Directed Research and Development (LDRD) Program; National Science Foundation (NSF)
OSTI Identifier:
1810432
Alternate Identifier(s):
OSTI ID: 1813852
Report Number(s):
LA-UR-21-20373
Journal ID: ISSN 0031-9007; PRLTAO; 051801
Grant/Contract Number:  
AC52-06NA25396; 89233218CNA000001; PHY-2013791
Resource Type:
Published Article
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Name: Physical Review Letters Journal Volume: 127 Journal Issue: 5; Journal ID: ISSN 0031-9007
Publisher:
American Physical Society
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; atomic; nuclear and particle physics

Citation Formats

Yan, Bin, and Yuan, C. -P. Anomalous Z b b ¯ Couplings: From LEP to LHC. United States: N. p., 2021. Web. doi:10.1103/PhysRevLett.127.051801.
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Yan, Bin, & Yuan, C. -P. Anomalous Z b b ¯ Couplings: From LEP to LHC. United States. https://doi.org/10.1103/PhysRevLett.127.051801
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Yan, Bin, and Yuan, C. -P. Tue . "Anomalous Z b b ¯ Couplings: From LEP to LHC". United States. https://doi.org/10.1103/PhysRevLett.127.051801.
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@article{osti_1810432,
title = {Anomalous Z b b ¯ Couplings: From LEP to LHC},
author = {Yan, Bin and Yuan, C. -P.},
abstractNote = {The bottom quark forward-backward asymmetry ($A^{b}_{FB}$) data at LEP exhibits a long-standing discrepancy with the standard model prediction. We propose a novel method to probe the $Zb\bar{b}$ interactions through gg → Zh production at the LHC, which is sensitive to the axial-vector component of the $Zb\bar{b}$ couplings. The apparent degeneracy of the anomalous $Zb\bar{b}$ couplings implied by the LEP precision electroweak measurements seems to be resolved by the current 13 TeV LHC Zh data, which is, however, dominated by the two data points with high transverse momentum of Z boson whose central values are in conflict with the standard model prediction. We also show the potential of the HL-LHC to either verify or exclude the anomalous $Zb\bar{b}$ couplings observed at LEP through measuring the Zh production rate at the HL-LHC, and this conclusion is not sensitive to the possible new physics contribution induced by top quark or Higgs boson anomalous couplings in the loop.},
doi = {10.1103/PhysRevLett.127.051801},
journal = {Physical Review Letters},
number = 5,
volume = 127,
place = {United States},
year = {Tue Jul 27 00:00:00 EDT 2021},
month = {Tue Jul 27 00:00:00 EDT 2021}
}
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https://doi.org/10.1103/PhysRevLett.127.051801
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