TeV Scale Leptoquarks as a Signature of Standard--like Superstring Models

Details TeV Scale Leptoquarks as a Signature of Standard--like Superstring Models TeV Scale Leptoquarks as a Signature of Standard--like Superstring Models

1993-12-12

arxiv.org/abs/hep-ph/9312263v2

Phys.Lett.B326:251-257,1994

Physics

High Energy Physics

High Energy Physics - Phenomenology

14 pages, uses phyzzx.tex, WIS-93/114/DEC-PH. (Section 2 is shortened, comparison to the flipped SU(5)XU(1) models added in Se

Scientific paper

10.1016/0370-2693(94)91318-8

We show that there can be TeV scale scalar and fermionic leptoquarks with very weak Yukawa couplings in a generic standard--like superstring model. Leptoquark--(down--like) quark mixing though present, is not large enough to violate the unitarity bounds on the CKM matrix. The constraints on leptoquark masses and couplings from FCNCs are easily satisfied whereas those from baryon number violation may cause problems. The leptoquarks of the model are compared to the ones in $E_6$ Calabi--Yau and flipped $SU(5) \times U(1)$ models.

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