In this Letter we explore the direct detection of the dark matter in the universe, assuming the dark matter particles are degenerate in mass with new colored particles below TeV scale. The scenario with such a mass spectrum is difficult to be confirmed or excluded by the present analysis at the LHC experiments because the QCD jets in the cascade decay of the new particles produced in the proton-proton collision are too soft to be triggered in the event selection. It is shown that both of the spin-independent and spin-dependent couplings of the dark matter with a nucleon are enhanced and the scattering cross section may reach even the current bound of the direct detection experiments. Then such a degenerate scenario may be tested in the direct detection experiments.
|Original language||English (US)|
|Number of pages||5|
|Journal||Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics|
|State||Published - Dec 6 2011|
Bibliographical noteFunding Information:
This Letter is supported by Grant-in-Aid for Scientific research from the Ministry of Education, Science, Sports, and Culture (MEXT), Japan , No. 20244037 , No. 20540252 , No. 22244021 and No. 23104011 (J.H.), and also by World Premier International Research Center Initiative (WPI Initiative), MEXT, Japan . This Letter was also supported in part by the U.S. Department of Energy under contract No. DE-FG02-92ER40701 , and by the Gordon and Betty Moore Foundation (K.I.).