A female Brown-fronted Woodpecker (Dendrocopos auriceps) was first observed and photographed in the Jilong Valley of the Mount Qomolangma Region,China,on 21 May 2012.The coordinates of the site are 28°19′25.03″...A female Brown-fronted Woodpecker (Dendrocopos auriceps) was first observed and photographed in the Jilong Valley of the Mount Qomolangma Region,China,on 21 May 2012.The coordinates of the site are 28°19′25.03″N,85°20′29.70"E at an elevation of 2150 m.A few months later,a male was observed at 28°20′02.49"N,85°20′46.30"E on 8 August at an elevation of 2197 m.The habitat is a mountain temperate coniferous and dry broadleaved mixed forest of the warm temperate zone.展开更多
Heavy gauge bosons such as W' are expected to exist in many extensions of the Standard Model. In this paper, the most general Lagrangian for the interaction of W' with top and bottom quarks is considered. This Lagra...Heavy gauge bosons such as W' are expected to exist in many extensions of the Standard Model. In this paper, the most general Lagrangian for the interaction of W' with top and bottom quarks is considered. This Lagrangian consists of V- A and V + A structure with in general complex couplings. Such interactions produce an Electric Dipole Moment (EDM) for the top quark at one loop level. We predict the allowed ranges for the mass and couplings of W' by using the upper limit on the top quark EDM.展开更多
文摘A female Brown-fronted Woodpecker (Dendrocopos auriceps) was first observed and photographed in the Jilong Valley of the Mount Qomolangma Region,China,on 21 May 2012.The coordinates of the site are 28°19′25.03″N,85°20′29.70"E at an elevation of 2150 m.A few months later,a male was observed at 28°20′02.49"N,85°20′46.30"E on 8 August at an elevation of 2197 m.The habitat is a mountain temperate coniferous and dry broadleaved mixed forest of the warm temperate zone.
文摘Heavy gauge bosons such as W' are expected to exist in many extensions of the Standard Model. In this paper, the most general Lagrangian for the interaction of W' with top and bottom quarks is considered. This Lagrangian consists of V- A and V + A structure with in general complex couplings. Such interactions produce an Electric Dipole Moment (EDM) for the top quark at one loop level. We predict the allowed ranges for the mass and couplings of W' by using the upper limit on the top quark EDM.