Gedanken worlds without Higgs fields: QCD-induced electroweak symmetry breaking
Gedanken worlds without Higgs fields: QCD-induced electroweak symmetry breaking
复制标题
没有希格斯场的格丹肯世界：QCD 引起的电弱对称性破缺
DOI：
10.1103/physrevd.79.096002
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发表时间：
2009
影响因子：
5
通讯作者：
R. Shrock
中科院分区：
文献类型：
--
作者：
C. Quigg;R. Shrock
为了阐明电弱对称性破缺是如何塑造物理世界的，我们研究了没有希格斯场或其他结构引入诱导自发对称性破缺的玩具模型。两个模型都具有标准SU（3）{sub c} x SU（2）{sub L} x U（1）{sub Y}规范对称性和与标准模型相似的费米子含量。第一类-像标准的电弱理论-不包含裸质量项，因此量子色动力学中手征对称性的自发破缺是电弱对称性破缺的唯一来源。第二类增加裸费米子质量足够小，QCD仍然是电弱对称性破缺的主要来源，该模型可以作为一个表现良好的低能有效场论，能量略高于强子尺度。第三类模型基于左右对称的SU（3）{sub c} x SU（2）{sub L} x SU（2）{sub R} x U（1）规范群。在第四类模型中，建立在SU（4）{sub PS} x SU（2）{sub L} x SU（2）{sub R}规范对称性上，轻子数被视为第四种颜色，色规范群被扩大到帕蒂和萨拉姆（PS）的SU（4）{sub PS}。这些模型的许多有趣的特征源于这样一个事实，即弱相互作用的有效强度比真实的世界中的更接近于剩余强相互作用的有效强度。无希格斯粒子模型不仅提供了与真实的世界的信息对比，而且还引导我们考虑将场论应用于真实的世界的有趣问题。«少
To illuminate how electroweak symmetry breaking shapes the physical world, we investigate toy models in which no Higgs fields or other constructs are introduced to induce spontaneous symmetry breaking. Two models incorporate the standard SU(3){sub c} x SU(2){sub L} x U(1){sub Y} gauge symmetry and fermion content similar to that of the standard model. The first class--like the standard electroweak theory--contains no bare mass terms, so the spontaneous breaking of chiral symmetry within quantum chromodynamics is the only source of electroweak symmetry breaking. The second class adds bare fermion masses sufficiently small that QCD remains the dominant source of electroweak symmetry breaking and the model can serve as a well-behaved low-energy effective field theory to energies somewhat above the hadronic scale. A third class of models is based on the left-right-symmetric SU(3){sub c} x SU(2){sub L} x SU(2){sub R} x U(1) gauge group. In a fourth class of models, built on SU(4){sub PS} x SU(2){sub L} x SU(2){sub R} gauge symmetry, the lepton number is treated as a fourth color and the color gauge group is enlarged to the SU(4){sub PS} of Pati and Salam (PS). Many interesting characteristics of the models stem from the fact that the effective strengthmore » of the weak interactions is much closer to that of the residual strong interactions than in the real world. The Higgs-free models not only provide informative contrasts to the real world, but also lead us to consider intriguing issues in the application of field theory to the real world.« less