https://doi.org/10.1140/epjc/s10052-020-08679-0
Letter
Realizing unification in two different SO(10) models with one intermediate breaking scale
1
Department of Physics, School of Engineering Sciences, KTH Royal Institute of Technology, AlbaNova University Center, Roslagstullsbacken 21, 106 91, Stockholm, Sweden
2
The Oskar Klein Centre for Cosmoparticle Physics, AlbaNova University Center, Roslagstullsbacken 21, 106 91, Stockholm, Sweden
* e-mail: pernow@kth.se
Received:
2
September
2020
Accepted:
14
November
2020
Published online:
25
November
2020
We derive the threshold corrections in $$\text {SO}(10)$$ grand unified models with the intermediate symmetry being flipped $$\,\text {SU}(5)\times \text {U}(1)$$ or $$\,\text {SU}(3)\times \,\text {SU}(2)\times \text {U}(1)\times \text {U}(1)$$, with the masses of the scalar fields set by the survival hypothesis. These models do not achieve gauge coupling unification if the matching conditions do not take threshold corrections into account. We present results showing the required size of threshold corrections for any value of the intermediate and unification scales. In particular, our results demonstrate that both of these models are disfavored since they require large threshold corrections to allow for unification with a predicted proton lifetime above current experimental bounds.
© The Author(s), 2020
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