Abstract
Based on a previous work on scenarios where the Standard Model and dark matter particles share a common asymmetry through effective operators at early time in the Universe and later on decouple from each other (not care), in this work, we study in detail the collider phenomenology of these scenarios. In particular, we use the experimental results from the Large Hadron Collider (LHC) to constrain the viable parameter space. Besides effective operators, we also constrain the parameter space of some representative ultraviolet complete models with experimental results from both the LHC and the Large Electron-Positron Collider. Specifically, we use measurements related to jets + missing transverse energy (MET), di-jets and photon + MET. In the case of ultraviolet models, depending on the assumptions on the couplings and masses of mediators, the derived constraints can become more or less stringent. We consider also the situation where one of the mediators has mass below 100 GeV, in this case we use the ultraviolet model to construct a new effective operator responsible for the sharing of the asymmetry and study its phenomenology.
Highlights
Since the entropy per comoving volume is assumed to be conserved, this value is equal to the SM baryon asymmetry at early time YB0SM = Y∆BSM when antibaryons were still in abundance, i.e. at high temperature T mn
Based on a previous work on scenarios where the Standard Model and dark matter particles share a common asymmetry through effective operators at early time in the Universe and later on decouple from each other, in this work, we study in detail the collider phenomenology of these scenarios
We investigate the Large Hadron Collider (LHC) phenomenology of the sharing scenario of ref. [9] in order to bound the viable parameter space of the model, taking into account constraints from Large Electron-Positron collider (LEP)
Summary
For the case where the sharing happens before EWSp processes freeze out, the lowest dimension SM operator is of dimension five which carries B − L = −2 [10, 11]. For the case where the sharing happens after EWSp processes freeze out, there are four dimension six operators which carry B = L = 1 but B − L = 0 [10, 12,13,14]. [9], the analysis was carried out considering two realizations of the sharing operator of eq (1.3), where coupling only to the first family SM fermions was assumed. (2.6) and (2.7) can be determined as a function of the DM mass, namely Λ = Λ(mX ) by the requirement that the total asymmetry is properly distributed between the SM and the DM sectors, in accordance with the observations. Please refer to ref. [9]
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