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Title: Probing the minimal U ( 1 ) X model at future electron-positron colliders via fermion pair-production channels

Journal Article · · Physical Review D

The minimal U(1)X extension of the Standard Model (SM) is a well-motivated new physics scenario, where anomaly cancellation dictates new neutral gauge boson (Z') couplings with the SM fermions in terms of the U(1)X charges of the new scalar fields. We investigate the SM charged fermion pair-production process for different values of these U(1)X charges at future e-e+ colliders: e+e- → $$f\overline{f}$$. Apart from the standard γ and Z-mediated processes, this model features additional s-channel (or both s and t-channel when f = e-) Z' exchange which interferes with the SM processes. We first estimate the bounds on the U(1)X coupling (g') and the Z' mass (MZ') considering the latest dilepton and dijet constraints from the heavy resonance searches at the LHC. Then using the allowed values of g', we study the angular distributions, forward-backward ($$\mathscr{A}$$FB), left-right ($$\mathscr{A}$$LR), and left-right forward-backward ($$\mathscr{A}$$LR,FB) asymmetries of the $$f\overline{f}$$ final states. We find that these observables can show substantial deviations from the SM results in the U(1)X model, thus providing a powerful probe of the multi-TeV Z' bosons at future e+e- colliders.

Research Organization:
Washington Univ., St. Louis, MO (United States)
Sponsoring Organization:
USDOE Office of Science (SC); National Research Foundation of Korea (NRF)
Grant/Contract Number:
SC0017987; NRF2020R1C1C1012452
OSTI ID:
1873448
Alternate ID(s):
OSTI ID: 1980113
Journal Information:
Physical Review D, Journal Name: Physical Review D Vol. 105 Journal Issue: 11; ISSN 2470-0010
Publisher:
American Physical SocietyCopyright Statement
Country of Publication:
United States
Language:
English

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