A heterotic standard model with B - L symmetry and a stable proton

作者：Buchbinder Evgeny I^*; Constantin Andrei; Lukas Andre

来源：The Journal of High Energy Physics, 2014, 2014(6): 100.

DOI：10.1007/JHEP06(2014)100

• Superstrings and Heterotic Strings
• Superstring Vacua

We consider heterotic Calabi-Yau compactifications with S(U(4) x U(1)) background gauge fields. These models lead to gauge groups with an additional U(1) factor which, under certain conditions, can combine with hypercharge to a B - L symmetry. The associated gauge boson is automatically super-massive and, hence, does not constitute a phenomenological problem. We illustrate this class of compactifications with a model based on the monad construction, which leads to a supersymmetric standard model with three families of quarks and leptons, one pair of Higgs doublets, three right-handed neutrinos and no exotics charged under the standard model group. The presence of the B - L symmetry means that the model is safe from proton decay induced by dimension four operators. Due to the presence of a special locus in moduli space where the bundle structure group is Abelian and the low-energy symmetry enhances we can also show the absence of dimension five proton-decay inducing operators.

• 出版日期2014-6-17