Zobrazeno 1 - 10
of 226
pro vyhledávání: '"Nishi, C."'
Autor:
de Lima, E. L. F., Nishi, C. C.
We study the flavor invariants of the SM augmented by one singlet vector-like quark. Aided by the Hilbert series, we construct all the basic invariants with which any flavor invariant can be written as a polynomial. In special, this theory contains o
Externí odkaz:
http://arxiv.org/abs/2408.10325
We investigate how the solution to the strong CP problem and the explanation for the observed fermion mass hierarchies can be intrinsically related. Specifically, we explore the Nelson-Barr mechanism and identify its "seesaw limit", where light quark
Externí odkaz:
http://arxiv.org/abs/2404.16945
Autor:
Nishi, C. C., Silva-Marcos, J. I.
Publikováno v:
Phys. Rev. D 108, 095031, 2023
The seesaw extension of the SM explains the tiny neutrino masses and it is accompanied by many CP violating phases. We study the case where all leptonic CP violation arises from the soft breaking in the heavy Majorana mass matrix. Parameter counting
Externí odkaz:
http://arxiv.org/abs/2305.08980
Autor:
Alves, João M., Branco, G. C., Cherchiglia, A. L., Nishi, C. C., Penedo, J. T., Pereira, Pedro M. F., Rebelo, M. N., Silva-Marcos, J. I.
Publikováno v:
Physics Reports 1057 (2024) 1-69
We review the theory and phenomenology of isosinglet vector-like quarks (VLQs). In recent years, interest in VLQs has been increasing, due to their contributions to new physics effects that can be tested in experiments at LHC and High-Luminosity LHC.
Externí odkaz:
http://arxiv.org/abs/2304.10561
Nelson-Barr models solve the strong CP problem based on spontaneous CP violation and generically requires vector-like quarks (VLQs) mixing with standard quarks to transmit the CP violation. We devise an explicit parametrization for the case of two VL
Externí odkaz:
http://arxiv.org/abs/2304.06078
One simple way to lower the scale of the seesaw mechanism that generates neutrino masses is to attribute part of their smallness to a suppressed vacuum expectation value of a second Higgs doublet as in the neutrinophilic 2HDM or in the type IB seesaw
Externí odkaz:
http://arxiv.org/abs/2304.00038
Publikováno v:
JHEP03(2022)010
Leptonic CP violation is yet to be confirmed as an additional source of CP violation in fundamental interactions. We study the case where leptonic CP violation is spontaneous and is induced by the mixing with a heavy charged vector-like lepton (VLL).
Externí odkaz:
http://arxiv.org/abs/2112.03943
Publikováno v:
JHEP11 (2021) 093
The Nelson-Barr (NB) mechanism to solve the strong CP problem assumes CP conservation, arranges vanishing $\bar{\theta}$ at tree-level and requires vector-like quarks (VLQs) to transmit the CP breaking to the SM. We analyze the flavor constraints com
Externí odkaz:
http://arxiv.org/abs/2103.04798
Autor:
Nishi, C. C., Fong, Chee Sheng
We formulate three-flavor type-I leptogenesis in the $\mu\tau$ basis which is convenient because in the three-flavor regime, both $\mu$ and $\tau$ charged lepton Yukawa interactions are in thermal equilibrium and the thermal bath is symmetric under t
Externí odkaz:
http://arxiv.org/abs/2005.03469
Autor:
Cherchiglia, A. L., Nishi, C. C.
Publikováno v:
High Energ. Phys. 2020, 104 (2020)
The Nelson-Barr mechanism to solve the strong CP problem requires vector-like quarks (VLQs) to transmit the spontaneous CP breaking to the SM. We study the scenario where only these VLQs are within reach at the TeV scale while the spontaneous CP brea
Externí odkaz:
http://arxiv.org/abs/2004.11318