Z-pole test of effective dark matter diboson interactions at the CEPC
نویسندگان
چکیده
منابع مشابه
Properties of Cold Dark Matter Halos at z > 6
We compute the properties of dark matter halos with mass 10 − 10M⊙ at redshift z = 6 − 11 in the standard cold dark matter cosmological model, utilizing a very high resolution N-body simulation. We find that dark matter halos in these mass and redshift ranges are significantly biased over matter with a bias factor in the range 2− 6. The dark matter halo mass function displays a slope of 2.05±0....
متن کاملvisible Z ′ and dark matter
We study the consequences of an extension of the standard model containing an invisible extra gauge group under which the SM particles are neutral. We show that effective operators, generated by loops of heavy chiral fermions charged under both gauge groups and connecting the new gauge sector to the Standard Model, can give rise to a viable dark matter candidate. Its annihilations produce clean...
متن کاملGeneralized Distribution Amplitudes at the Z pole
We investigate the exclusive two-pion production at the Z-pole through the process ee → Z → ππγ. In the kinematical region where the invariant mass of the two pions is much smaller than the mass of the Z boson, the process can be factorized into the convolution of a hard coefficient and a soft matrix element, the generalized distribution amplitude of two pions. We calculate the differential cro...
متن کاملQuarkonium Production at the Z Pole
The direct production rate of J/ψ via the color-octet mechanism is calculated at the Z resonance. The color-octet production process Z → J/ψqq̄ is shown to have a substantial branching ratio as well as a distinctive energy spectrum, which can be used as a powerful tool to distinguish from the color-singlet direct production of the J/ψ. Despite charmonium and bottomonium have been discovered some...
متن کاملZ ′ Signals from Kaluza - Klein Dark Matter
In a minimal model of universal extra dimensions the lightest Kalzua-Klein particle is neutral and stable because of Kaluza-Klein parity conservation and it is a dark matter candidate. The corresponding level 2 mode of the lightest Kaluza-Klein particle can be detected via KK number violating decays to Standard Model particles. The expected sensitivity to second level Kaluza-Klein modes of neut...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: The European Physical Journal C
سال: 2018
ISSN: 1434-6044,1434-6052
DOI: 10.1140/epjc/s10052-018-6093-5