SU(5) unification with TeV-scale leptoquarks

Cox, Peter; Kusenko, Alexander; Sumensari, Olcyr; Yanagida, Tsutomu T.

doi:10.1007/JHEP03(2017)035

Title: SU(5) unification with TeV-scale leptoquarks

Journal Article · 06 March 2017 · Journal of High Energy Physics (Online)

DOI: https://doi.org/10.1007/JHEP03(2017)035 · OSTI ID:1423956

^[1]; Kusenko, Alexander ^[2]; Sumensari, Olcyr ^[3]; Yanagida, Tsutomu T. ^[4]

Univ. of Tokyo (Japan). Kavli Inst. for the Physics and Mathematics of the Universe; University of California Los Angeles
Univ. of Tokyo (Japan). Kavli Inst. for the Physics and Mathematics of the Universe; Univ. of California, Los Angeles, CA (United States). Dept. of Physics and Astronomy
Univ. Paris-Sud, Orsay (France). Lab. of Theoretical Physics; Univ. of Sao Paulo (Brazil). Inst. of Physics
Univ. of Tokyo (Japan). Kavli Inst. for the Physics and Mathematics of the Universe

It has previously been noted that SU(5) unification can be achieved via the simple addition of light scalar leptoquarks from two split 10 multiplets. We explore the parameter space of this model in detail and find that unification requires at least one leptoquark to have mass below ≈ 16 TeV. We point out that introducing splitting of the 24 allows the unification scale to be raised beyond 10¹⁶ GeV, while a U(1)_PQ symmetry can be imposed to forbid dangerous proton decay mediated by the light leptoquarks. The latest bounds from LHC searches are combined and we find that a leptoquark as light as 400 GeV is still permitted. Finally, we discuss the interesting possibility that the leptoquarks required for unification could also be responsible for the 2.6σ deviation observed in the ratio R _K at LHCb.

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Research Organization:: Univ. of Tokyo (Japan). Kavli Inst. for the Physics and Mathematics of the Universe

Sponsoring Organization:: European Union (EU); Ministry of Education, Culture, Sports, Science and Technology (MEXT); USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25); Univ. of Sydney (Australia); World Premier International Research Center Initiative (WPI Initiative)

Grant/Contract Number:: SC0009937

OSTI ID:: 1423956

Journal Information:: Journal of High Energy Physics (Online), Journal Name: Journal of High Energy Physics (Online) Journal Issue: 3 Vol. 2017; ISSN 1029-8479

Publisher:: Springer BerlinCopyright Statement

Country of Publication:: United States

Language:: English

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