Abstract
Using the optical theorem from the conditions of perturbative unitarity, we have established the upper bounds on the ratios of the Wilson coefficients to the square of the new physics scale for anomalous operators contributing to the processes of single t-quark production in hadron collisions. The limitations are found in an analytical form and are given numerically in the form of characteristic regions.
Similar content being viewed by others
REFERENCES
E. E. Boos, “The SMEFT formalism is the basis for finding deviations from the Standard Model,” Phys. Usp. 65, 653–676 (2022).
E. Boos and V. Bunichev, “Symbolic expressions for fully differential single top quark production cross section and decay width of polarized top quark in the presence of anomalous Wtb couplings,” Phys. Rev. D 101, 055012 (2020).
F. Déliot, N. Hadley, S. Parke, and T. Schwarz, “Properties of the top quark,” Annu. Rev. Nucl Part. Sci. 64, 363—382 (2014). arXiv:1910.00710.
E. Boos, O. Brandt, D. Denisov, S. Denisov, and P. Grannis, “The top quark (20 years after its discovery),” arXiv:1509.03325 arXiv:1509.03325.
C. E. Gerber and C. Vellidis, “Review of Tevatron results: top quark physics,” Int. J. Mod. Phys. A 30, 1541005 (2015).
M. Cristinziani and M. Mulders, “Top-quark physics at the Large Hadron Collider,” J. Geom. Phys. 44, 063001 (2017). arXiv:1606.00327.
U. Husemann, “Top-quark physics: status and prospects,” Prog. Part. Nucl. Phys. 95, 48—97 (2017). arXiv: 1704.01356.
W. Buchmuller and D. Wyler, “Effective Lagrangian analysis of new interactions and flavor conservation,” Nucl. Phys. B 268, 621–653 (1986).
B. Grzadkowski, M. Iskrzynski, M. Misiak, and J. Rosiek, “Dimension-six terms in the standard model Lagrangian,” J. High Energy Phys. 10, 085 (2010).
D. Barducci et al., “Interpreting top-quark LHC measurements in the standard-model effective field theory,”(2018). arXiv:1802.07237.
G. L. Kane, G. A. Ladinsky, and C. P. Yuan, “Using the top quark for testing standard model polarization and CP predictions,” Phys. Rev. D 45, 124–141 (1992).
K. Whisnant, J. M. Yang, B. L. Young, and X. Zhang, “Dimension-six CP conserving operators of the third family quarks and their effects on collider observables,” Phys. Rev. D 56, 467–478 (1997). arXiv:hep-ph/9702305.
E. Boos, M. Dubinin, M. Sachwitz, and H. J. Schreiber, “Probe of the W t b coupling in t anti-t pair production at linear colliders,” Eur. Phys. J. C 16, 269–278 (2000). arXiv:hep-ph/0001048.
J. A. Aguilar-Saavedra, “Single top quark production at LHC with anomalous Wtb couplings,” Nucl. Phys. B 804, 160–192 (2008). arXiv:0803.3810 [hep-ph].
J. L. Birman, F. Deliot, M. C. N. Fiolhais, A. Onofre, and C. M. Pease, “New limits on anomalous contributions to the Wtb vertex,” Phys. Rev. D 93, 113021 (2016). arXiv:1605.02679.
C. Zhang and S. Willenbrock, “Effective-field-theory approach to top-quark production and decay,” Phys. Rev. D 83, 034006 (2011).
E. E. Boos, V. E. Bunichev, L. V. Dudko, M. A. Perfilov, and G. A. Vorotnikov, “Eligibility of EFT approach to search for Tqg FCNC phenomenon,” Phys. Atom. Nucl. 83, 984–988 (2020) arXiv:2004.14498.
V. Khachatryan et al. (CMS Collab.), “Search for anomalous Wtb couplings and flavour-changing neutral currents in t-channel single top quark production in pp collisions at \(\sqrt s \) = 7 and 8 TeV,” J. High Energy Phys. 02, 028 (2017). arXiv:1610.03545.
Funding
This work was supported by the Russian Science Foundation, grant no. 22-12-00152.
Author information
Authors and Affiliations
Corresponding authors
Rights and permissions
About this article
Cite this article
Boos, E.E., Bunichev, V.E. Unitary Limitations of the SMEFT Approach in Describing New Physics in the Processes of Single Top Quark Production. Phys. Part. Nuclei Lett. 20, 330–335 (2023). https://doi.org/10.1134/S1547477123030147
Received:
Revised:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1134/S1547477123030147