Dipole operator constraints on composite Higgs models.

Dipole operator constraints on composite Higgs models.
复制标题

DOI:
10.1140/epjc/s10052-014-2945-9
复制
发表时间:
2014
期刊:
The European physical journal. C, Particles and fields
影响因子:
--
通讯作者:
Straub DM
Straub DM
中科院分区:
其他
文献类型:
--
作者:
König M;Neubert M;Straub DM

文献摘要

参考文献

被引文献

相似文献

夸克区中违反味道和CP的电磁或色磁偶极算符是在一大类新的物理模型中产生的,并受到中子电偶极矩的测量和对气味变化敏感的中性电流的敏感观测参数的强烈约束,如分支比和。在与模型无关的相关约束的讨论之后,我们分析了部分合成模型中的这些效应,其中夸克通过与类矢量型复合费米子混合来获得它们的质量。这些场景可以被视为复合希格斯模型或扭曲的额外维度模型的低能量限制。我们研究了复合费米子的电弱表示的不同选择,这是由电弱精度测试以及不同的味道结构所驱动的,包括味道无政府状态和或强区域中的味道对称性。在具有“错误手性”汤川耦合的模型中,我们发现了一个来自中子电偶极矩的强束缚,而与气味结构无关。在味道混乱的情况下,我们也发现来自违反味道的偶极子的强烈界限,而这些约束在味道对称的模型中是温和的。
Flavour- and CP-violating electromagnetic or chromomagnetic dipole operators in the quark sector are generated in a large class of new physics models and are strongly constrained by measurements of the neutron electric dipole moment and observables sensitive to flavour-changing neutral currents, such as the branching ratio and . After a model-independent discussion of the relevant constraints, we analyze these effects in models with partial compositeness, where the quarks get their masses by mixing with vector-like composite fermions. These scenarios can be seen as the low-energy limit of composite Higgs or warped extra dimensional models. We study different choices for the electroweak representations of the composite fermions motivated by electroweak precision tests as well as different flavour structures, including flavour anarchy and or flavour symmetries in the strong sector. In models with “wrong-chirality” Yukawa couplings, we find a strong bound from the neutron electric dipole moment, irrespective of the flavour structure. In the case of flavour anarchy, we also find strong bounds from flavour-violating dipoles, while these constraints are mild in the flavour-symmetric models.
DOI: 10.1103/physrevd.74.053011
发表时间: 2006-09-01
期刊: PHYSICAL REVIEW D
影响因子: 5
作者:
Agashe, Kaustubh;Blechman, Andrew E.;Petriello, Frank
通讯作者: Petriello, Frank
DOI: 10.1088/1126-6708/2008/04/006
发表时间: 2008-04-01
影响因子: 5.4
作者:
Cacciapaglia, Giacomo;Csaki, Csaba;Weiler, Andreas
通讯作者: Weiler, Andreas
DOI: 10.1103/physrevlett.98.022003
发表时间: 2007-01-12
影响因子: 8.6
作者:
Becher, Thomas;Neubert, Matthias
通讯作者: Neubert, Matthias
DOI: 10.1103/physrevlett.64.1709
发表时间: 1990-04-09
影响因子: 8.6
作者:
BRAATEN, E;LI, CS;YUAN, TC
通讯作者: YUAN, TC
DOI: 10.1103/physrevd.79.056006
发表时间: 2009-03-01
期刊: PHYSICAL REVIEW D
影响因子: 5
作者:
Agashe, Kaustubh;Azatov, Aleksandr;Zhu, Lijun
通讯作者: Zhu, Lijun