RECORD
Flavor changing single top quark production channels at e^+e^- colliders in the effective Lagrangian description
High Energy Physics - Phenomenology · Submitted 19 May 1999
abstract compiled · 2026-09-23 · no language-model review
The authors' main claim We show that e^+ e^- colliders are most sensitive to the physics responsible for the contact tcee vertices.
The compiled record
The paper's own sentences, arranged. Each label is drawn from a closed vocabulary; the number beside it is the probability the classifier gave that label. Numbers in the tables are the authors', checked by code. No sentence in this record was written by a model.
Open the compiled record
The abstract, sentence by sentence
We perform a global analysis of the sensitivity of LEP2 and e^+e^- colliders with a c.m. energy in the range 500 - 2000 GeV to new flavor-changing single top quark production in the effective Lagrangian approach. The processes considered are sensitive to new flavor-changing effective vertices such as Ztc, htc, four-Fermi tcee contact terms as well as a right-handed Wtb coupling. We show that e^+ e^- colliders are most sensitive to the physics responsible for the contact tcee vertices. For example, it is found that the recent data from the 189 GeV LEP2 run can be used to rule out any new flavor physics that can generate these four-Fermi operators up to energy scales of \Lambda > 0.7 - 1.4 TeV, depending on the type of the four-Fermi interaction. We also show that a corresponding limit of \Lambda > 1.3 - 2.5 and \Lambda > 17 - 27 TeV can be reached at the future 200 GeV LEP2 run and a 1000 GeV e^+e^- collider, respectively. We note that these limits are much stronger than the typical limits which can be placed on flavor diagonal four-Fermi couplings. Similar results hold for \mu^+\mu^- colliders and for tu(bar) associated production. Finally we briefly comment on the necessity of measuring all flavor-changing effective vertices as they can be produced by different types of heavy physics.
background contribution method result interpretation main claim
| # | sentence | role | the authors' own work | states the main conclusion | strength |
|---|---|---|---|---|---|
| s0 | We perform a global analysis of the sensitivity of LEP2 and e^+e^- colliders with a c.m. energy in the range 500 - 2000 GeV to new flavor-changing single top quark production in the effective Lagrangian approach. | contribution 0.99 | 0.94 | 0.07 | asserted 0.93 |
| s1 | The processes considered are sensitive to new flavor-changing effective vertices such as Ztc, htc, four-Fermi tcee contact terms as well as a right-handed Wtb coupling. | contribution 0.67 | 0.36 | 0.05 | asserted 0.98 |
| s2 | We show that e^+ e^- colliders are most sensitive to the physics responsible for the contact tcee vertices. | result 0.96 | 0.90 | 0.49 | asserted 1.00 |
| s3 | For example, it is found that the recent data from the 189 GeV LEP2 run can be used to rule out any new flavor physics that can generate these four-Fermi operators up to energy scales of \Lambda > 0.7 - 1.4 TeV, depending on the type of the four-Fermi interaction. | result 1.00 | 0.88 | 0.24 | asserted 0.99 |
| s4 | We also show that a corresponding limit of \Lambda > 1.3 - 2.5 and \Lambda > 17 - 27 TeV can be reached at the future 200 GeV LEP2 run and a 1000 GeV e^+e^- collider, respectively. | result 1.00 | 0.91 | 0.23 | asserted 0.99 |
| s5 | We note that these limits are much stronger than the typical limits which can be placed on flavor diagonal four-Fermi couplings. | interpretation 0.93 | 0.64 | 0.14 | asserted 1.00 |
| s6 | Similar results hold for \mu^+\mu^- colliders and for tu(bar) associated production. | result 0.93 | 0.70 | 0.05 | asserted 0.95 |
| s7 | Finally we briefly comment on the necessity of measuring all flavor-changing effective vertices as they can be produced by different types of heavy physics. | future work 0.57 | 0.28 | 0.06 | asserted 0.72 |
What was examined, and what was not
- arXiv listing abstract v2
- full text
- figures and tables
- references and citing sentences
- relations to other papers
- P abstract
- S sections
- T body sentences
- C citations
- R cross-paper relations
The paper
Original abstract
We perform a global analysis of the sensitivity of LEP2 and e^+e^- colliders with a c.m. energy in the range 500 - 2000 GeV to new flavor-changing single top quark production in the effective Lagrangian approach. The processes considered are sensitive to new flavor-changing effective vertices such as Ztc, htc, four-Fermi tcee contact terms as well as a right-handed Wtb coupling. We show that e^+ e^- colliders are most sensitive to the physics responsible for the contact tcee vertices. For example, it is found that the recent data from the 189 GeV LEP2 run can be used to rule out any new flavor physics that can generate these four-Fermi operators up to energy scales of \Lambda > 0.7 - 1.4 TeV, depending on the type of the four-Fermi interaction. We also show that a corresponding limit of \Lambda > 1.3 - 2.5 and \Lambda > 17 - 27 TeV can be reached at the future 200 GeV LEP2 run and a 1000 GeV e^+e^- collider, respectively. We note that these limits are much stronger than the typical limits which can be placed on flavor diagonal four-Fermi couplings. Similar results hold for \mu^+\mu^- colliders and for tu(bar) associated production. Finally we briefly comment on the necessity of measuring all flavor-changing effective vertices as they can be produced by different types of heavy physics.
Human review
References
How the literature uses it
6 arXiv papers cite this in 9 sentences
Papers citing it · 4 sentences without a confident label
Uses its method or tool 2 papers
-
In this study, we adopt the parametrization from Refs. [ref] for the effective Lagrangian describing flavor-changing $tu̅ℓ^+ℓ^-$ contact interactions, given by: [equation] where $u$ represents up- and charm-quarks, $ℓ$ represents the electron, muon, and $τ$ and the different couplings are given by $V_i j^ℓ$ (vector-like), $S_i j^ℓ$ (scalar-like), and $T_i j^ℓ$ (tensor-like).
Machine Learning Approaches to Top Quark Flavor-Changing Four-Fermion Interactions in Trilepton Signals at the LHC · Top Quark Flavor-Changing Four-Fermion Interactions and Experimental Constraints · 0.91
-
After Fierz transformation the part of Lagrangian containing the above four-Fermi operators can be parameterized as follows [ref] : [equation] where $P_L,R = (1 ∓γ_5)/2$, $σ^μν = i/4 [γ^μγ^ν-γ^νγ^μ]$ and express these vector-like ($V_ij$), scalar-like ($S_ij$) and tensor-like ($T_ij$) couplings in terms of the coefficients of the seven four-Fermi operators we mentioned above.
Top FCNC interactions through dimension six four-fermion operators at the electron proton collider · The signal production at the LHeC · 0.92
Cites it as background 3 papers
-
In previous studies, the flavor-changing 4-Fermi interactions involving top quarks, such as $tuℓℓ$ and $tcℓℓ$ described by Lagrangian presented in Eq.[ref], have been extensively explored as potential signatures of NP beyond the SM [ref] .
Machine Learning Approaches to Top Quark Flavor-Changing Four-Fermion Interactions in Trilepton Signals at the LHC · Top Quark Flavor-Changing Four-Fermion Interactions and Experimental Constraints · 0.95
-
Limited studies on $tc$ production at lepton colliders have been documented in the existing literature [ref] .
Probing flavor constrained SMEFT operators through $tc$ production at the Muon collider · Introduction · 0.88
-
The effective field theory (EFT) [ref] is a particularly relevant framework for parametrizing new physics and has been used in many top-quark FCNC studies [ref] .
A global approach to top-quark flavor-changing interactions · Introduction · 0.89
Discussion
Know something about this paper? Leave a comment, or highlight any passage above to comment on it.