R-宇称破缺的相互作用研究

Probing R-parity violating interactions from topquark polarization at LHC

在LHC上,最小超对称标准模型中R-宇称破缺相互作用使LHC上tt—对的产生有两种过程,一种是交换slepton粒子的t道的dR-dR→tLt—L过程,一种是交换squark粒子的u道的dRd-R→tRt—R过程.这样的top夸克对的产生机理会使tt—事例中的top夸克产生极化不对称现象.研究发现,由于LHC较高的统计性,在LHC上top夸克极化的统计灵敏度以及限定相应的R-宇称破缺耦合常数的能力均比Tevatron upgrade上的强.

In minimal supersymmetric standard model, the R-parity violating interactions can induce anomalous top pair productions at the LHC through the t-channel process dRd-R→tLt-L by exchanging a slepton or the u-channel process dRd-R→tRt-R by exchanging a squark. Such top pair productions with certain chirality cause top quark polarization in the top pair events. We found that at the LHC, due to the large statistics, the statistical significance of the polarization observable and thus the probing ability for the corresponding R-parity violating couplings are much higher than at the Tevatmn Upgrade.