The standard model left-handed neutrinos and several right-handed neutrinos can obtain a tiny Dirac mass matrix through their mixings with relatively heavy Dirac fermions. In this Dirac seesaw scenario. the mixings involving the left-handed neutrinos can be allowed much larger than those involving the right-handed neutrinos. This undemocratic parameter choice is attractive to phenomen... https://www.macorners.shop/product-category/leather-bracelet-with-name-beads-gift-box/
Leather Bracelet With Name Beads Gift Box
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