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Boosted dark matter signals uplifted with self-interaction
Kong, Kyoungchul,Mohlabeng, Gopolang,Park, Jong-Chul North-Holland Pub. Co 2015 Physics letters. Section B Vol.743 No.-
<P><B>Abstract</B></P> <P>We explore detection prospects of a non-standard dark sector in the context of boosted dark matter. We focus on a scenario with two dark matter particles of a large mass difference, where the heavier candidate is secluded and interacts with the standard model particles only at loops, escaping existing direct and indirect detection bounds. Yet its pair annihilation in the galactic center or in the Sun may produce boosted stable particles, which could be detected as visible Cherenkov light in large volume neutrino detectors. In such models with multiple candidates, self-interaction of dark matter particles is naturally utilized in the <I>assisted freeze-out</I> mechanism and is corroborated by various cosmological studies such as <I>N</I>-body simulations of structure formation, observations of dwarf galaxies, and the small scale problem. We show that self-interaction of the secluded (heavier) dark matter greatly enhances the capture rate in the Sun and results in promising signals at current and future experiments. We perform a detailed analysis of the boosted dark matter events for Super-Kamiokande, Hyper-Kamiokande and PINGU, including notable effects such as evaporation due to self-interaction and energy loss in the Sun.</P>
Probing TeV scale top-philic resonances with boosted top-tagging at the high luminosity LHC
Kim, Jeong Han,Kong, Kyoungchul,Lee, Seung J.,Mohlabeng, Gopolang American Physical Society 2016 Physical Review D Vol.94 No.3
<P>We investigate the discovery potential of singly produced top-philic resonances at the high luminosity (HL) LHC in the four-top final state. Our analysis spans over the fully hadronic, semileptonic, and samesign dilepton channels where we present concrete search strategies adequate to a boosted kinematic regime and high jet-multiplicity environments. We utilize the template overlap method with newly developed template observables for tagging boosted top quarks, a large-radius jet variable M-J, and customized b-tagging tactics for background discrimination. Our results show that the same-sign dilepton channel gives the best sensitivity among the considered channels, with an improvement of significance up to 10%-20% when combined with boosted top-tagging. Both the fully hadronic and semileptonic channels yield comparable discovery potential and contribute to further enhancements in the sensitivity by combining all channels. Finally, we show the sensitivity of a top-philic resonance at the LHC and HL-LHC by showing the 2 sigma exclusion limit and 5 sigma discovery reach, including a combination of all three channels.</P>