Leptonic Radiative Decay in Supersymmetry without R parity
Chien-Yi Chen, Otto C. W. Kong
备注：
Comments: 24 pages, 12 figures, 3 table, RevTex; Corrected typos, 2 added references for section 1. The proof-read version to be published in Phys. Rev. D
我们提出了一个详细的分析与精确的数值计算上的单圈贡献的辐射衰变的$μ$和$τ$，即$μ\to e γ$，$τ\to e γ$，和$τ\toμγ$从超对称没有R宇称的分支比，专注于贡献涉及双线性耦合。进行数值研究，以获得明确的界限下，目前的实验限制的参数。我们提出，并在计算中使用，精确的质量本征态有效耦合的公式。在这个意义上，我们提出了一个精确的分析，从近似的第一次。在将我们的结果与最接近的早期分析进行比较后，我们发现在某些${μ_i^*} {B_j}$组合上产生的约束存在重大差异。考虑了中微子质量对参数的约束。我们的结果表明，$μ\to e γ$上的分支比测量下降到$10^{-13}-10^{-14}$和超越，作为MEG实验的目标，有机会观察到从R-宇称违反情况的衰变。
英文摘要：
We present a detailed analysis together with exact numerical calculations on one-loop contributions to the branching ratio of the radiative decay of $μ$ and $τ$, namely $μ\to e γ$, $τ\to e γ$, and $τ\toμγ$ from supersymmetry without R parity, focusing on contributions involving bilinear couplings. A numerical study is performed to obtain explicit bounds on the parameters under the present experimental limit. We present, and use in the calculation, formulas for exact mass eigenstate effective couplings. In this sense, we present an exact analysis free from approximation for the first time. After comparing our results against the closest early analysis, we discovered a major difference in resulted constraints on some ${μ_i^*} {B_j}$ combinations. Constraints from neutrino masses on the parameters were considered. Our result indicates that the branching ratio measurement on $μ\to e γ$ down to $10^{-13}-10^{-14}$ and beyond, as targeted by the MEG experiment, has a chance of observing decay from the R-parity violating scenario.
Supersymmetry without R-parity : Constraints from Leptonic Phenomenology
R-宇称守恒是超对称标准模型最流行的版本中的{ \it ad hoc}假设。大多数研究模型，允许R-奇偶违反已被限制到各种限制的情况下。本文所采用的单VEV参数化方法为无R宇称超对称性的唯象分析提供了一个可行的框架。我们在树水平上对轻子现象进行了全面的研究。对各种过程的实验约束进行了单独研究，然后结合产生的容许参数空间的区域。特别是，我们表明，大R-奇偶违反双线性耦合不排除，特别是对于大$\tanβ$。
Polarized Single Top Production at Leptonic Colliders from Broken R Parity Interactions Incorporating CP Violation
研究了在高能轻子对撞机上，R宇称破坏相互作用在顶夸克与粲反夸克的联合产生中的贡献。我们集中讨论与半轻子顶衰变有关的反应。一组特征的动力学分布的信号事件的评估和对比的结果与那些从标准模型W玻色子对生产背景。接下来，我们转向研究CP-奇数可观测，与顶自旋，这导致一对CP-共轭的最终状态，$b \bar l ν\bar c$和$ \bar b l \bar νc $的发射带电轻子的能量分布的不对称性。一个非零的不对称性产生的CP-奇相位，嵌入在R奇偶违反耦合常数，通过干扰项之间的R奇偶违反幅度在树和循环的水平。
K -> pi nu nubar and R-parity violating supersymmetry
基于最近E787、E949和E865合作的实验数据以及标准模型（SM）预测与数据之间的差异，我们详细考虑了R宇称破坏（RPV）对K -> pi nu nubar超对称性的贡献.这种衰减的理论上的干净性构成了一种有用的方式来提供约束，与长距离效应无关。包括单圈R-奇偶守恒（RPC）超对称性和树级RPV超对称贡献之间的干扰的可能性，我们的结果允许改善R-奇偶违反耦合相对于以前的分析的限制。
Search for R-Parity Violating Supersymmetry at the CMS Experiment
回顾了CMS基于2012年8 TeV LHC运行的19.5/fb全数据集对R宇称破坏超对称性的最新研究结果。结果被解释的背景下，具有多轻子和b-夸克喷流签名，具有低丢失的横向能量所产生的光顶夸克对与R-宇称违反衰变的最轻的超对称粒子的简化模型。除了简化模型外，本文还提出了一种新的唯象MSSM解释方法，证明了从多轻子末态得到的结果对各种超对称模型都是有效的。
We revisit the limits on $R$-parity violation in the minimal supersymmetric standard model. In particular, we focus on the high-scale supersymmetry scenario in which all the sparticles are in excess of the inflationary scale of approximately $10^{13}$ GeV, and thus no sparticles ever come into thermal equilibrium. In this case the cosmological limits, stemming from the preservation of the baryon asymmetry that have been previously applied for weak scale supersymmetry, are now relaxed. We argue that even when sparticles are never in equilibrium, $R$-parity violation is still constrained via hig…
We update the bounds on $R$-parity violating supersymmetry originating from meson oscillations in the $B^0_{d/s}$ and $K^0$ systems. To this end, we explicitly calculate all corresponding contributions from $R$-parity violating operators at the one-loop level, thereby completing and correcting existing calculations. We apply our results to the derivation of bounds on $R$-parity violating couplings, based on up-to-date experimental measurements. In addition, we consider the possibility of cancellations among flavor-changing contributions of various origins, e.g. from multiple $R$-parity violati…
