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CERN Document Server Znaleziono 8 rekordów  Szukanie trwało 0.68 sekund. 
1.
What is the Geometry of Effective Field Theories? / Cohen, Timothy (CERN ; EPFL, Lausanne, LPTP ; Oregon U.) ; Lu, Xiaochuan (UC, San Diego (main)) ; Zhang, Zhengkang (U. Utah, Salt Lake City)
We elaborate on a recently proposed geometric framework for scalar effective field theories. [...]
CERN-TH-2024-176 ; arXiv:2410.21378. - 7.
Fulltext
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2.
On Amplitudes and Field Redefinitions / Cohen, Timothy (CERN ; EPFL, Lausanne, LPTP ; Oregon U.) ; Lu, Xiaochuan (UC, San Diego) ; Sutherland, Dave (Glasgow U.)
We derive an off-shell recursion relation for correlators that holds at all loop orders. This allows us to prove how generalized amplitudes transform under generic field redefinitions, starting from an assumed behavior of the one-particle-irreducible effective action. [...]
arXiv:2312.06748; CERN-TH-2023-233.- 2024-06-24 - 50 p. - Published in : JHEP 2406 (2024) 149 Fulltext: 2312.06748 - PDF; document - PDF;
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3.
Effective Field Theory of the Two Higgs Doublet Model / Banta, Ian (UC, Santa Barbara) ; Cohen, Timothy (CERN ; EPFL, Lausanne, LPTP ; Oregon U.) ; Craig, Nathaniel (UC, Santa Barbara ; Santa Barbara, KITP) ; Lu, Xiaochuan (UC, San Diego) ; Sutherland, Dave (Glasgow U.)
We revisit the effective field theory of the two Higgs doublet model at tree level. The introduction of a novel basis in the UV theory allows us to derive matching coefficients in the effective description that resum important contributions from the Higgs vacuum expectation value. [...]
arXiv:2304.09884; CERN-TH-2023-058.- 2023-06-23 - 39 p. - Published in : JHEP 2306 (2023) 150 Fulltext: 2304.09884 - PDF; document - PDF;
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4.
Anomaly Cancellation in Effective Field Theories From the Covariant Derivative Expansion / Cohen, Timothy (CERN ; EPFL, Lausanne, LPTP ; Oregon U.) ; Lu, Xiaochuan (Oregon U. ; UC, San Diego) ; Zhang, Zhengkang (UC, Santa Barbara)
We extend our recently-proposed formalism for calculating anomalies of global and gauge symmetries using the Covariant Derivative Expansion to include a general class of operators that can appear in relativistic Effective Field Theories (EFTs). This allows us to prove that EFT operators involving general scalar, vector, and tensor couplings to fermion bilinears only give rise to irrelevant anomalies, which can be removed by an appropriate choice of counterterms, thereby confirming the absence of new constraints from anomaly cancellation on the Standard Model EFT..
arXiv:2301.00827; CERN-TH-2023-002.- 2023-09-01 - 21 p. - Published in : Phys. Rev. D 108 (2023) 056027 Fulltext: PDF;
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5.
Anomalies From the Covariant Derivative Expansion / Cohen, Timothy (CERN ; EPFL, Lausanne, LPTP ; Oregon U.) ; Lu, Xiaochuan (Oregon U. ; UC, San Diego) ; Zhang, Zhengkang (UC, Santa Barbara)
We revisit the calculation of anomalies for global and gauge symmetries in the framework of the Covariant Derivative Expansion (CDE). Due to the presence of UV divergences, the result is an ambiguous quantity that depends on the regularization procedure and the renormalization scheme. [...]
arXiv:2301.00821; CERN-TH-2023-001.- 2023-06-01 - 46 p. - Published in : Phys. Rev. D 107 (2023) 116015 Fulltext: PDF;
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6.
Precision matching of microscopic physics to the Standard Model Effective Field Theory (SMEFT) / Greljo, Admir (Universitaet Bern (CH)) ; Dawson, Sally (Department of Physics, Brookhaven National Laboratory (US)) ; Lohwasser, Kristin (University of Sheffield (GB)) ; Aebischer, Jason (Universität Zürich (CH)) ; Das Bakshi, Supratim (Universidad de Granada (ES)) ; Carmona, Adrían (Universidad de Granada (ES)) ; Chakrabortty, Joydeep (Indian Institute of Technology Kanpur (IN)) ; Cohen, Timothy (University of Oregon (US)) ; Criado, Juan Carlos (Durham University (UK)) ; Fuentes-Martín, Javier (Universidad de Granada (ES)) et al.
This note gives an overview of the tools for the precision matching of ultraviolet theories to the Standard Model effective field theory (SMEFT) at the tree level and one loop. Several semi- and fully automated codes are presented, as well as some supplementary codes for the basis conversion and the subsequent running and matching at low energies. [...]
arXiv:2212.02905; CERN-LHCEFTWG-2022-002; CERN-LPCC-2022-07.- Geneva : CERN, 2022 - 23 p. Fulltext: CERN-LHCEFTWG-2022-002 - PDF; 2212.02905 - PDF;
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7.
Theoretical developments in the SMEFT at dimension-8 and beyond / Alioli, Simone (INFN, Milan Bicocca) ; Boughezal, Radja (Argonne) ; Cao, Weiguang (Tokyo U., IPMU ; Tokyo U.) ; Chala, Mikael (Granada U., Theor. Phys. Astrophys.) ; Díaz-Carmona, Álvaro (Granada U., Theor. Phys. Astrophys.) ; Bakshi, Supratim Das (Granada U., Theor. Phys. Astrophys.) ; Durieux, Gauthier (CERN) ; Gráf, Lukáš (UC, Berkeley ; UC, San Diego) ; Guedes, Guilherme (Granada U., Theor. Phys. Astrophys.) ; Henning, Brian Quinn (EPFL, Lausanne, LPTP) et al.
In this contribution to the Snowmass 2021 process we review theoretical developments in the Standard Model Effective Field Theory (SMEFT) with a focus on effects at the dimension-8 level and beyond. [...]
arXiv:2203.06771. - 37.
eConf - Fulltext
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8.
On-Shell Covariance of Quantum Field Theory Amplitudes / Cohen, Timothy (Oregon U.) ; Craig, Nathaniel (UC, Santa Barbara) ; Lu, Xiaochuan (Oregon U.) ; Sutherland, Dave (INFN, Trieste ; CERN)
Scattering amplitudes in quantum field theory are independent of the field parameterization, which has a natural geometric interpretation as a form of `coordinate invariance.' Amplitudes can be expressed in terms of Riemannian curvature tensors, which makes the covariance of amplitudes under non-derivative field redefinitions manifest. We present a generalized geometric framework that extends this manifest covariance to $all$ allowed field redefinitions. [...]
arXiv:2202.06965.- 2023-01-27 - 6 p. - Published in : Phys. Rev. Lett. 130 (2023) 041603 Fulltext: Publication - PDF; 2202.06965 - PDF;
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