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of 139
pro vyhledávání: '"Silva,Marcos J."'
When extending the SM, e.g. with vector-like quarks (VLQ), one inevitably encounters more than one CP violating complex phases. In this work, we develop a method useful in reducing the number of complex phases in scenarios with one and two VLQs. We s
Externí odkaz:
http://arxiv.org/abs/2407.07158
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
We suggest a simple relation between the quark and the lepton mixing within the framework of type-I seesaw mechanism. We show that within our ansatz the empirical King-Mohapatra-Smirnov relation, which suggests a connection between the CKM and PMNS m
Externí odkaz:
http://arxiv.org/abs/2304.06747
We propose a minimal set of weak-basis invariants in an extension of the SM where one up-type isosinglet vector-like quark is introduced, which allows us to obtain all the physical content of the CKM matrix. We present CP-odd invariants of lower orde
Externí odkaz:
http://arxiv.org/abs/2210.14248
We put forward the conjecture that the small numbers in the $V_\text{CKM}$ matrix, are generated by physics beyond the Standard Model. We identify as small numbers $V_{ub}$ and the strength of CP violation, measured by $|\text{Im}Q|$, where $Q$ stand
Externí odkaz:
http://arxiv.org/abs/2207.14235
Autor:
Botella, Francisco J., Branco, G. C., Rebelo, M. N., Silva-Marcos, J. I., Bastos, José Filipe
We propose a minimal extension of the Standard Model where an up-type vector-like quark, denoted $T$, is introduced and provides a simple solution to the CKM unitarity problem. We adopt the Botella-Chau parametrization in order to extract the $4\time
Externí odkaz:
http://arxiv.org/abs/2111.15401
We point out that hints of deviations from unitarity in the first row of the CKM matrix may be explained by the presence of a single vector-like top. We study how the stringent experimental constraints arising from CP Violation in the kaon sector and
Externí odkaz:
http://arxiv.org/abs/2103.13409
We consider seesaw type-I models including at least one (mostly-)sterile neutrino with mass at the eV scale. Three distinct situations are found, where the presence of light extra neutrinos is naturally justified by an approximately conserved lepton
Externí odkaz:
http://arxiv.org/abs/1912.05875
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