Electroweak Kaluza-Klein dark matter

Abstract

Abstract:In models with universal extra dimensions (UED), the lightest Kaluza-Klein excitation of neutral electroweak gauge bosons is a stable, weakly interacting massive particle and thus is a candidate for dark matter thanks to Kaluza-Klein parity. We examine concrete model realizations of such dark matter in the context of non-minimal UED extensions. The boundary localized kinetic terms for the electroweak gauge bosons lead to a non-trivial mixing among the first Kaluza-Klein excitations of the SU(2) W and U(1) Y gauge bosons and the resultant low energy phenomenology is rich. We investigate implications of various experiments including low energy electroweak precision measurements, direct and indirect detection of dark matter particles and direct collider searches at the LHC. Notably, we show that the electroweak Kaluza-Klein dark matter can be as heavy as 2.4 TeV, which is significantly higher than 1.3 TeV as is indicated as an upper bound in the minimal UED model.

Effects of universal extra dimensions on top-quark electromagnetic interactions

“…In the context of a non-minimal model of universal extra dimensions, enriched by the presence boundary localized kinetic terms [72][73][74], the authors of Ref. [75] were able to give a more stringent bound on the compactification scale: 2.4 TeV R −1 .…”

Limits on Kaluza–Klein dark matter annihilation in the Sun from recent IceCube results

“…Additional constraints from cosmology (that the B 1 must have a relic density compatible with the estimated dark matter density from CMB measurements) require the mass of the B 1 to be below ∼1.6 TeV [9,23,31]. Thus, taken all results together, the allowed parameter space for the B 1 to constitute the only component of dark matter in the Universe is currently quite restricted, but non-minimal UED models, not probed here, can still provide viable dark matter candidates [10].…”

“…(B 1 ), the first excitation of the scalar gauge boson in the theory [5,6,7,8,9,10]. Usually denoted as the lightest Kaluza-Klein particle (LKP), it can have a mass in the range from a few hundred GeV (limit from rare decay processes [11,12]) to a few TeV (to avoid overclosing the Universe), the mass being proportional to 1/R, where R is the size of the extra dimension.…”

Exploring non minimal Universal Extra Dimensional model at the LHC

“…Furthermore, a lot of effort has been put in the investigation of such model from the perspective of DM [40,41], Z-boson decay to b-quarks [42], rare decays of top quarks [43,44], gauge fixing [45], decays of B-meson [46,47] and more recently R(D (⋆) ) anomalies [48]. In [49], authors have done a detailed analysis of KK-dark matter in the light of various experimental constraints. Productions of KK-excitations of the strongly interacting KK-quarks and KK-gluons at the LHC have been investigated in [50].…”