Top quark electromagnetic dipole moments

14th Mexican Workshop on Particles and Fields

Bouzas, Antonio O.^1 ; Larios, F.^1

Departamento de Física Aplicada, CINVESTAV-Mérida, A.P. 73, Mérida, Yucatán

97310, Mexico^1

关键词: Decay process;    Parameter regions;    Photoproductions;    Stringent constraints;    Top quarks;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/651/1/012014/pdf
DOI  :  10.1088/1742-6596/651/1/012014

来源: IOP

【 摘 要 】

The magnetic and electric dipole moments of the top quark are constrained indirectly by the Br(B → Xsγ) and the ACP (B → Xsγ) measurements. They can also be tested by top quark production and decay processes. The recent measurement of ttγ production by CDF are used to set direct constraints. The B → Xsγ measurements by themselves define an allowed parameter region that sets up stringent constraints on both dipole moments. The measurement by CDF has a37% error that is too large to set any competitive bounds, for which a much lower 5% error would be required. For the LHC it is found that with its higher energy the same measurement could indeed further constrain the allowed parameter region given by the B → Xsγ measurement [1]. In addition, the proposed LHeC experiment (electron- proton) could provide even more stringent constraints than the LHC via the tt¯ photoproduction channel [2].