| Summary: | The <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msub><mi>E</mi><mn>6</mn></msub></semantics></math></inline-formula>-inspired extension of the minimal supersymmetric (SUSY) standard model (MSSM) with an extra <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mi>U</mi><msub><mrow><mo>(</mo><mn>1</mn><mo>)</mo></mrow><mi>N</mi></msub></mrow></semantics></math></inline-formula> gauge symmetry, under which right-handed neutrinos have zero charge, involves exotic matter beyond the MSSM to ensure anomaly cancellation. We consider the variant of this extension (SE<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msub><mrow></mrow><mn>6</mn></msub></semantics></math></inline-formula>SSM) in which the cold dark matter is composed of the lightest neutral exotic fermion and gravitino. The observed baryon asymmetry can be induced in this case via the decays of the lightest right-handed neutrino/sneutrino into exotic states even for relatively low reheating temperatures <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msub><mi>T</mi><mi>R</mi></msub><mo>≲</mo><msup><mn>10</mn><mrow><mn>6</mn><mo>−</mo><mn>7</mn></mrow></msup><mspace width="0.166667em"></mspace><mrow><mi>G</mi><mi>e</mi><mi>V</mi></mrow></mrow></semantics></math></inline-formula>. We argue that there are some regions of the SE<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msub><mrow></mrow><mn>6</mn></msub></semantics></math></inline-formula>SSM parameter space, which are safe from all current constraints, and discuss the implications of this model for collider phenomenology.
|
|---|