Light weakly coupled axial forces: models, constraints, and projections
Abstract
Here, we investigate the landscape of constraints on MeV-GeV scale, hidden U(1) forces with nonzero axial-vector couplings to Standard Model fermions. While the purely vector-coupled dark photon, which may arise from kinetic mixing, is a well-motivated scenario, several MeV-scale anomalies motivate a theory with axial couplings which can be UV-completed consistent with Standard Model gauge invariance. Moreover, existing constraints on dark photons depend on products of various combinations of axial and vector couplings, making it difficult to isolate the e ects of axial couplings for particular flavors of SM fermions. We present a representative renormalizable, UV-complete model of a dark photon with adjustable axial and vector couplings, discuss its general features, and show how some UV constraints may be relaxed in a model with nonrenormalizable Yukawa couplings at the expense of fine-tuning. We survey the existing parameter space and the projected reach of planned experiments, brie y commenting on the relevance of the allowed parameter space to low-energy anomalies in π0 and 8Be* decay.
- Authors:
- Publication Date:
- Research Org.:
- Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), High Energy Physics (HEP)
- OSTI Identifier:
- 1345639
- Report Number(s):
- FERMILAB-PUB-16-385-PPD; UCI-HEP-TR-2016-15; MITP-16-098; PUPT-2507; arXiv:1609.09072
Journal ID: ISSN 1029-8479; 1488576
- Grant/Contract Number:
- AC02-07CH11359
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Journal of High Energy Physics (Online)
- Additional Journal Information:
- Journal Name: Journal of High Energy Physics (Online); Journal Volume: 2017; Journal Issue: 5; Journal ID: ISSN 1029-8479
- Publisher:
- Springer Berlin
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; Beyond Standard Model; gauge symmetry
Citation Formats
Kahn, Yonatan, Krnjaic, Gordan, Mishra-Sharma, Siddharth, and Tait, Tim M. P. Light weakly coupled axial forces: models, constraints, and projections. United States: N. p., 2017.
Web. doi:10.1007/JHEP05(2017)002.
Kahn, Yonatan, Krnjaic, Gordan, Mishra-Sharma, Siddharth, & Tait, Tim M. P. Light weakly coupled axial forces: models, constraints, and projections. United States. https://doi.org/10.1007/JHEP05(2017)002
Kahn, Yonatan, Krnjaic, Gordan, Mishra-Sharma, Siddharth, and Tait, Tim M. P. Mon .
"Light weakly coupled axial forces: models, constraints, and projections". United States. https://doi.org/10.1007/JHEP05(2017)002. https://www.osti.gov/servlets/purl/1345639.
@article{osti_1345639,
title = {Light weakly coupled axial forces: models, constraints, and projections},
author = {Kahn, Yonatan and Krnjaic, Gordan and Mishra-Sharma, Siddharth and Tait, Tim M. P.},
abstractNote = {Here, we investigate the landscape of constraints on MeV-GeV scale, hidden U(1) forces with nonzero axial-vector couplings to Standard Model fermions. While the purely vector-coupled dark photon, which may arise from kinetic mixing, is a well-motivated scenario, several MeV-scale anomalies motivate a theory with axial couplings which can be UV-completed consistent with Standard Model gauge invariance. Moreover, existing constraints on dark photons depend on products of various combinations of axial and vector couplings, making it difficult to isolate the e ects of axial couplings for particular flavors of SM fermions. We present a representative renormalizable, UV-complete model of a dark photon with adjustable axial and vector couplings, discuss its general features, and show how some UV constraints may be relaxed in a model with nonrenormalizable Yukawa couplings at the expense of fine-tuning. We survey the existing parameter space and the projected reach of planned experiments, brie y commenting on the relevance of the allowed parameter space to low-energy anomalies in π0 and 8Be* decay.},
doi = {10.1007/JHEP05(2017)002},
journal = {Journal of High Energy Physics (Online)},
number = 5,
volume = 2017,
place = {United States},
year = {Mon May 01 00:00:00 EDT 2017},
month = {Mon May 01 00:00:00 EDT 2017}
}
Web of Science
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