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pro vyhledávání: '"Ng, John N."'
The Belle II experiment recently observed the decay $B^+ \to K^+ \nu \nu$ for the first time, with a measured value for the branching ratio of $ (2.3 \pm 0.7) \times 10^{-5}$. This result exhibits a $\sim 3\sigma$ deviation from the Standard Model (S
Externí odkaz:
http://arxiv.org/abs/2312.00982
Autor:
Chang, We-Fu, Ng, John N.
Publikováno v:
Phys. Rev. D 101, 035028 (2020)
We studied a simple model of hidden sector consists of a Dirac fermion $\chi$ and a spontaneously broken $U(1)_s$ symmetry. The dark sector is connected to the Standard Model(SM) via three righthanded SM singlet neutrinos, $N_R$'s, and the kinetic mi
Externí odkaz:
http://arxiv.org/abs/1903.12545
Autor:
Chang, We-Fu, Ng, John N.
Publikováno v:
Phys. Rev. D 99, 075025 (2019)
A new anomaly-free gauged $U(1)_\ell$ lepton-number model is studied. Two standard model lepton generations acquire the same but oppositive sign $U(1)_\ell$ charges, while four exotic chiral leptons cancel the anomalies of the remaining lepton family
Externí odkaz:
http://arxiv.org/abs/1808.08188
Autor:
Chang, We-Fu, Ng, John N.
Publikováno v:
JHEP10(2018)015
We investigate the tree-level neutrino mass generation in the gauged $U(1)_\ell$ lepton model recently proposed by us [arXiv:1805.10382]. With the addition of one Standard Model(SM) singlet, $\phi_1(Y=0, \ell=1)$, and one SM triplet scalar, $T(Y=-1,\
Externí odkaz:
http://arxiv.org/abs/1807.09439
Autor:
Chang, We-Fu, Ng, John N.
Publikováno v:
Phys. Rev. D 98, 035015 (2018)
We construct a new gauged $U(1)_\ell$ lepton number model which is anomaly-free for each SM generation. The active neutrino masses are radiatively generated with a minimal scalar sector. The phenomenology and collider signals are studied. The interfe
Externí odkaz:
http://arxiv.org/abs/1805.10382
Publikováno v:
Phys. Rev. D 97, 115015 (2018)
We look at the prospects for detecting light bosons, $X$, at proposed Z factories assuming a production of $10^{12}$ Z bosons. Such a large yield is within the design goals of future FCC-ee and CEPC colliders. Specifically we look at the cases where
Externí odkaz:
http://arxiv.org/abs/1803.00148
Publikováno v:
Phys. Rev. D 97, 055020 (2018)
In the general Higgs portal like models, the extra neutral scalar, $S$, can mix with the Standard Model (SM) Higgs boson, $H$. We perform an exploratory study focusing on the direct search for such a light singlet $S$ at the Large Hadron Collider (LH
Externí odkaz:
http://arxiv.org/abs/1711.05722
Akademický článek
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Autor:
Chang, We-Fu, Ng, John N.
Publikováno v:
JCAP07(2016)027
We study the 1-loop renormalization group equation running in the simplest singlet Majoron model constructed by us earlier to accommodate the dark radiation and dark matter content in the universe. A comprehensive numerical study was performed to exp
Externí odkaz:
http://arxiv.org/abs/1604.02017
In this study we explore the LHC's Run II potential to the discovery of heavy Majorana neutrinos, with luminosities between $30$ and $3000$ fb$^{-1}$ in the $l^{\pm}l^{\pm}j~j$ final state. Given that there exist many models for neutrino mass generat
Externí odkaz:
http://arxiv.org/abs/1505.01934