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arXiv 1303.3248hep-ph
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125 GeV玻色子:复合标量?

The 125 GeV boson: A composite scalar?

Adriano Doff, Emerson G. S. Luna, Adriano A. Natale

摘要:

假设在LHC上观测到的125 GeV粒子是复合标量,并导致了电弱规范对称性破缺,我们考虑了束缚态是由非阿贝尔规范理论产生的可能性,该规范理论具有动态产生的规范玻色子质量和特定的手征对称性破缺动力学。标量质量的计算使用贝特-萨尔彼得方程及其归一化条件作为SU(N)群和相应的费米子表示的函数。如果构成复合态的费米子是SU(N)群的基本表象,那么我们只能对每个群的一个特定数目的费米子产生这样的轻玻色子。在小群的情况下,如SU(2)到SU(5),在伴随表示中有两个费米子,我们发现产生这样的轻复合标量是相当不可能的。

英文摘要:

Assuming that the 125 GeV particle observed at the LHC is a composite scalar and responsible for the electroweak gauge symmetry breaking, we consider the possibility that the bound state is generated by a non-Abelian gauge theory with dynamically generated gauge boson masses and a specific chiral symmetry breaking dynamics motivated by confinement. The scalar mass is computed with the use of the Bethe-Salpeter equation and its normalization condition as a function of the SU(N) group and the respective fermionic representation. If the fermions that form the composite state are in the fundamental representation of the SU(N) group, we can generate such light boson only for one specific number of fermions for each group. In the case of small groups, like SU(2) to SU(5), and two fermions in the adjoint representation we find that is quite improbable to generate such light composite scalar.

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