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CERN Document Server Encontrados 21 registros  1 - 10siguientefinal  ir al registro: La búsqueda tardó 1.41 segundos. 
1.
Field Redefinitions Can Be Nonlocal / Cohen, Timothy (CERN ; EPFL, Lausanne, LPTP ; Oregon U.) ; Forslund, Matthew (YITP, Stony Brook ; Brookhaven) ; Helset, Andreas (CERN)
We revisit the lore establishing the allowed space of field redefinitions and show that there are essentially no restrictions. [...]
CERN-TH-2024-216 ; YITP-SB-2024-35 ; arXiv:2412.12247. - 36.
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2.
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.
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3.
Operator Origin of Anomalous Dimensions in de Sitter Space / Cohen, Timothy (CERN ; EPFL, Lausanne, LPTP ; Oregon U.) ; Green, Daniel (UC, San Diego (main)) ; Huang, Yiwen (UC, San Diego (main))
The late time limit of the power spectrum for heavy (principal series) fields in de Sitter space yields a series of polynomial terms with complex scaling dimensions. [...]
CERN-TH-2024-103 ; arXiv:2407.08581. - 42.
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4.
Recursion for Wilson-line Form Factors / Cohen, Timothy (CERN ; EPFL, Lausanne, LPTP ; Oregon U.) ; Riembau, Marc (CERN)
Matrix elements of Wilson-line dressed operators play a central role in the factorization of soft and collinear modes in gauge theories. When expressed using spinor helicity variables, these so-called form factors admit a classification starting from a Maximally Helicity Violating configuration, in close analogy with gauge theory amplitudes. [...]
arXiv:2406.03540; CERN-TH-2024-069.- 2024-10-17 - 28 p. - Published in : JHEP 2410 (2024) 132 Fulltext: 2406.03540 - PDF; document - PDF;
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5.
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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6.
Dark Sector Glueballs at the LHC / Batz, Austin (Oregon U.) ; Cohen, Timothy (Oregon U. ; CERN ; EPFL, Lausanne, LPTP) ; Curtin, David (Toronto U.) ; Gemmell, Caleb (Toronto U.) ; Kribs, Graham D. (Oregon U.)
We study confining dark sectors where the lightest hadrons are glueballs. Such models can provide viable dark matter candidates and appear in some neutral naturalness scenarios. [...]
arXiv:2310.13731; CERN-TH-2023-194.- 2024-04-12 - 27 p. - Published in : JHEP 2404 (2024) 070 Fulltext: 2310.13731 - PDF; document - PDF;
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7.
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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8.
Dark Sector Showers in the Lund Jet Plane / Cohen, Timothy (CERN ; EPFL, Lausanne, LPTP ; Oregon U.) ; Roloff, Jennifer (Brookhaven) ; Scherb, Christiane (LBL, Berkeley ; UC, Berkeley (main))
We investigate the consequences of models where dark sector quarks could be produced at the LHC, which subsequently undergo a dark parton shower, generating jets of dark hadrons that ultimately decay back to Standard Model hadrons. This yields collider objects that can be nearly indistinguishable from Standard Model jets, motivating the reliance on substructure observables to tease out the signal. [...]
arXiv:2301.07732; CERN-TH-2023-007.- 2023-08-01 - 7 p. - Published in : Phys. Rev. D 108 (2023) L031501 Fulltext: 2301.07732 - PDF; Publication - PDF;
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9.
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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10.
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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CERN Document Server : Encontrados 21 registros   1 - 10siguientefinal  ir al registro:
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