Minimal universal extra dimensions ( mUED ) is often thought to predict that the lightest Kaluza-Klein particle ( LKP ) is the Kaluza-Klein gauge boson B ^ { 1 } , leading to conventional missing energy signals at colliders and WIMP dark matter .
In fact , the implications of mUED are far richer : the B ^ { 1 } , charged Higgs boson H ^ { \pm 1 } , and graviton G ^ { 1 } are all possible LKPs , leading to many different “ phases ” with distinct signatures .
Considering the complete phase diagram , we find predictions for charged or neutral particles with decay lengths of microns to tens of meters ; WIMP , superWIMP , or charged relic particles ; metastable particles with lifetimes of the order of or in excess of the age of the universe ; and scenarios combining two or more of these phenomena .
In the cosmologically preferred region , the Higgs boson mass is between 180 and 245 GeV , the LKP mass is between 810 and 1400 GeV , and the maximal splitting between first Kaluza-Klein modes is less than 320 GeV .
This region predicts a variety of exotic collider signals , such as slow charged particles , displaced vertices , tracks with non-vanishing impact parameters , track kinks , and even vanishing charged tracks , all of which provide early discovery possibilities at the Large Hadron Collider .