Zobrazeno 1 - 10
of 392
pro vyhledávání: '"Kazuo Fujikawa"'
Autor:
Kazuo Fujikawa
Publikováno v:
European Physical Journal C: Particles and Fields, Vol 84, Iss 5, Pp 1-8 (2024)
Abstract The oscillations of ultra-relativistic neutrinos are realized by the propagation of assumed zero-mass on-shell neutrinos with the speed of light in vacuum combined with the phase modulation by the small mass term $$\exp [-i(m^{2}_{\nu _{k}}/
Externí odkaz:
https://doaj.org/article/f16d6700c24440fa8fca598ed13f49ab
Autor:
Kazuo Fujikawa
Publikováno v:
European Physical Journal C: Particles and Fields, Vol 80, Iss 3, Pp 1-12 (2020)
Abstract The Majorana neutrino $$\psi _{M}(x)$$ ψM(x) when constructed as a superposition of chiral fermions such as $$\nu _{L} + C\overline{\nu _{L}}^{T}$$ νL+CνL¯T is characterized by $$ (\mathcal{C}\mathcal{P}) \psi _{M}(x)(\mathcal{C}\mathcal
Externí odkaz:
https://doaj.org/article/5f911aa1b8e44295b7f4dd1171295b2d
Autor:
Kazuo Fujikawa, Anca Tureanu
Publikováno v:
European Physical Journal C: Particles and Fields, Vol 79, Iss 9, Pp 1-8 (2019)
Abstract It is shown that the specific “charge conjugation” transformation used to define the Majorana fermions in the conventional seesaw mechanism, namely $$(\nu _{R})^{C}=C\overline{\nu _{R}}^{T}$$ (νR)C=CνR¯T for a chiral fermion $$\nu _{R
Externí odkaz:
https://doaj.org/article/84cbcb75eaab43c1a02ac123917138b1
Autor:
Kazuo Fujikawa
Publikováno v:
Physics Letters B, Vol 789, Iss , Pp 76-81 (2019)
We discuss a generalization of the Pauli–Gursey transformation, which is motivated by the Autonne–Takagi factorization, to an arbitrary n number of generations of neutrinos using U(2n) that defines general canonical transformations and diagonaliz
Externí odkaz:
https://doaj.org/article/55f6334d709c4252a1811316883db21d
Autor:
Shinichi Deguchi, Kazuo Fujikawa
Publikováno v:
Physics Letters B, Vol 802, Iss , Pp - (2020)
A new static and azimuthally symmetric magnetic monopolelike object, which looks like a Dirac monopole when seen from far away but smoothly changes to a dipole near the monopole position and vanishes at the origin, is discussed. This monopolelike obj
Externí odkaz:
https://doaj.org/article/16cf436ff1ca4b0d909dca6721dbcedd
Autor:
Kazuo Fujikawa
Publikováno v:
Physics Letters B, Vol 781, Iss , Pp 295-301 (2018)
The Lagrangian of the seesaw mechanism is C violating but the same Lagrangian when re-written in terms of Majorana neutrinos is manifestly C invariant. To resolve this puzzling feature, a relativistic analogue of Bogoliubov transformation, which pres
Externí odkaz:
https://doaj.org/article/38c367883eb44826a18d2ac0c8d2ba5e
Autor:
Kazuo Fujikawa, Anca Tureanu
Publikováno v:
Physics Letters B, Vol 777, Iss , Pp 240-245 (2018)
The possible neutron–antineutron oscillation is described by an effective quadratic Lagrangian analogous to the BCS theory. It is shown that the conventional equal-time anti-commutation relations of the neutron variable n(t,x→) are modified by th
Externí odkaz:
https://doaj.org/article/ecacef4d075d4a2e8f4ca0c35cf71dcb
Autor:
Kazuo Fujikawa, Anca Tureanu
Publikováno v:
Symmetry, Vol 13, Iss 11, p 2202 (2021)
We review several aspects of parity and CP violation in the framework of neutron-antineutron oscillations. We focus on the parity doubling theorem, which provides a criterion for neutron oscillation in the general theory with ΔB=2 baryon number-viol
Externí odkaz:
https://doaj.org/article/05e084572c9d4a5abb267ad374c7d057
Autor:
Kazuo Fujikawa, Anca Tureanu
Publikováno v:
Physics Letters B, Vol 774, Iss C, Pp 273-278 (2017)
We suggest that the Majorana neutrino should be regarded as a Bogoliubov quasiparticle that is consistently understood only by use of a relativistic analogue of the Bogoliubov transformation. The unitary charge conjugation condition CψC†=ψ is not
Externí odkaz:
https://doaj.org/article/d44fd94bf7a0495b97186928cdf6ffab
Autor:
Kazuo Fujikawa, Anca Tureanu
Publikováno v:
Physics Letters B, Vol 767, Iss C, Pp 199-204 (2017)
We present an alternative perspective on the see-saw mechanism for the neutrino mass, according to which the small neutrino mass is given as a difference of two large masses. This view emerges when an analogue of the Bogoliubov transformation is used
Externí odkaz:
https://doaj.org/article/ddfd6f87d2414be080e48dae1ca25081