Journal article 1218 views 152 downloads
Large mass hierarchies from strongly-coupled dynamics
,
Georg Bergner,
Daniel Elander,
C.-J. David Lin,
Biagio Lucini ,
Maurizio Piai
Journal of High Energy Physics, Volume: 2016, Issue: 6
Swansea University Authors:
Ed Bennett , Biagio Lucini , Maurizio Piai
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DOI (Published version): 10.1007/JHEP06(2016)114
Abstract
Besides the Higgs particle discovered in 2012, with mass 125 GeV, recent LHC data show tentative signals for new resonances in diboson as well as diphoton searches at high center-of-mass energies (2 TeV and 750 GeV, respectively). If these signals are confirmed (or other new resonances are discovere...
| Published in: | Journal of High Energy Physics |
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| ISSN: | 1029-8479 |
| Published: |
2016
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| Online Access: |
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| URI: | https://cronfa.swan.ac.uk/Record/cronfa28315 |
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| Abstract: |
Besides the Higgs particle discovered in 2012, with mass 125 GeV, recent LHC data show tentative signals for new resonances in diboson as well as diphoton searches at high center-of-mass energies (2 TeV and 750 GeV, respectively). If these signals are confirmed (or other new resonances are discovered at the TeV scale), the large hierarchies between masses of new bosons require a dynamical explanation. Motivated by these tentative signals of new physics, we investigate the theoretical possibility that large hierarchies in the masses of glueballs could arise dynamically in new strongly-coupled gauge theories extending the standard model of particle physics. We study lattice data on non-Abelian gauge theories in the (near-)conformal regime as well as a simple toy model in the context of gauge/gravity dualities. We focus our attention on the ratio $R$ between the mass of the lightest spin-2 and spin-0 resonances, that for technical reasons is a particularly convenient and clean observable to study. For models in which (non-perturbative) large anomalous dimensions arise dynamically, we show indications that this mass ratio can be large, with $R>5$. Moreover, our results suggest that $R$ might be related to universal properties of the IR fixed point. Our findings provide an interesting step towards understanding large mass ratios in the non-perturbative regime of quantum field theories with (near) IR conformal |
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| Item Description: |
The Author has given a substantial contribution to the design of the project, has written most of Sect. II and provided input for the other Sections, has designed the lattice calculations of Sect. II and has performed the analysis of the data for one of the two cases discussed therein. DOI: 10.1007/JHEP06(2016)114. |
| College: |
Faculty of Science and Engineering |
| Issue: |
6 |