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105 results on '"Craig, Nathaniel"'

3. Effective Field Theories as Lagrange Spaces

Author

Craig, Nathaniel, Lee, Yu-Tse, Lu, Xiaochuan, and Sutherland, Dave

Subjects
High Energy Physics - Theory, High Energy Physics - Phenomenology
Abstract

We present a formulation of scalar effective field theories in terms of the geometry of Lagrange spaces. The horizontal geometry of the Lagrange space generalizes the Riemannian geometry on the scalar field manifold, inducing a broad class of affine connections that can be used to covariantly express and simplify tree-level scattering amplitudes. Meanwhile, the vertical geometry of the Lagrange space characterizes the physical validity of the effective field theory, as a torsion component comprises strictly higher-point Wilson coefficients. Imposing analyticity, unitarity, and symmetry on the theory then constrains the signs and sizes of derivatives of the torsion component, implying that physical theories correspond to a special class of vertical geometry., Comment: 35 pages, 1 figure. v2: Journal version

Published
2023
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9. P not PQ

Author

Craig, Nathaniel, Garcia, Isabel Garcia, Koszegi, Giacomo, and McCune, Amara

Published
2021
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20. Naturalness: past, present, and future.

Author

Craig, Nathaniel

Subjects
*COSMOLOGICAL constant, *PHYSICS
Abstract

We assess the state of naturalness in high-energy physics and summarize recent approaches to the three major naturalness problems: the cosmological constant problem, the electroweak hierarchy problem, and the strong CP problem. [ABSTRACT FROM AUTHOR]

Published
2023
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48. The muon Smasher’s guide.

Author

Al Ali, Hind, Arkani-Hamed, Nima, Banta, Ian, Benevedes, Sean, Buttazzo, Dario, Cai, Tianji, Cheng, Junyi, Cohen, Timothy, Craig, Nathaniel, Ekhterachian, Majid, Fan, JiJi, Forslund, Matthew, Garcia, Isabel Garcia, Homiller, Samuel, Koren, Seth, Koszegi, Giacomo, Liu, Zhen, Lu, Qianshu, Lyu, Kun-Feng, and Mariotti, Alberto

Subjects
ELECTROWEAK interactions, MUONS, ELECTRIC dipole moments, GRAVITATIONAL waves, SYMMETRY breaking, DARK matter
Abstract

We lay out a comprehensive physics case for a future high-energy muon collider, exploring a range of collision energies (from 1 to 100 TeV) and luminosities. We highlight the advantages of such a collider over proposed alternatives. We show how one can leverage both the point-like nature of the muons themselves as well as the cloud of electroweak radiation that surrounds the beam to blur the dichotomy between energy and precision in the search for new physics. The physics case is buttressed by a range of studies with applications to electroweak symmetry breaking, dark matter, and the naturalness of the weak scale. Furthermore, we make sharp connections with complementary experiments that are probing new physics effects using electric dipole moments, flavor violation, and gravitational waves. An extensive appendix provides cross section predictions as a function of the center-of-mass energy for many canonical simplified models. [ABSTRACT FROM AUTHOR]

Published
2022
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50. THE UNEXPLORED LANDSCAPE OF TWO-BODY RESONANCES.

Author

CRAIG, NATHANIEL, DRAPER, PATRICK, KYOUNGCHUL KONG, YVONNE NG, and WHITESON, DANIEL

Subjects
*RESONANCE, *PHYSICS, *PARTICLES
Abstract

We propose a strategy for searching for theoretically-unanticipated new physics which avoids a large trials factor by focusing on experimental strengths. Searches for resonances decaying into pairs of visible particles are experimentally very powerful due to the localized mass peaks and have a rich history of discovery. Yet, due to a focus on subsets of theoreticallymotivated models, the landscape of such resonances is far from thoroughly explored. We survey the existing set of searches, identify untapped experimental opportunities and discuss the theoretical constraints on models which would generate such resonances. [ABSTRACT FROM AUTHOR]

Published
2019
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