论文标题
LHC对标量diquarks的约束
LHC Constraints on Scalar Diquarks
论文作者
论文摘要
几年前，研究了对标量diquarks的低能限制，这些粒子将彼此对夸克的粒子进行了检查。发现两个最弱的diquarks是$ d^u $和$ d^d $，颜色的抗triplets，将它们与$ u_ {r}^{r}^{i} u_ {r}^r}^{r}^{j} $和$ d_ {r}^{r}^{r}^{i} d_} d_ {r}^{r}^j} $相应地。在LHC上没有观察到这些diquark。在本文中，我们将LHC测量值添加到低能分析中，并发现约束得到显着改善。例如，以$ x^u $为$ d^u $耦合到第一代和第二代，对于$ m_ {d^u} = 600 $ gev，低能量约束是$ | x^u | \ leq 14.4 $，而LHC Dijet测量的添加导致$ | x^u | \ leq 0.13 $ - $ 0.15 $。通过添加$ P_T $削减的单个顶级生产的测量，可以获得进一步的改进。在对diquarks的其他低能间接影响进行预测时，必须考虑这些新约束。
A number of years ago, low-energy constraints on scalar diquarks, particles that couple to two quarks, were examined. It was found that the two most weakly-constrained diquarks are $D^u$ and $D^d$, colour antitriplets that couple to $u_{R}^{i} u_{R}^{j}$ and $d_{R}^{i} d_{R}^{j}$, respectively. These diquarks have not been observed at the LHC. In this paper, we add the LHC measurements to the low-energy analysis, and find that the constraints are significantly improved. As an example, denoting $x^u$ as the $D^u$ coupling to the first and second generations, for $M_{D^u} = 600$ GeV, the low-energy constraint is $|x^u| \leq 14.4$, while the addition of the LHC dijet measurement leads to $|x^u| \leq 0.13$--$0.15$. Further improvements are obtained by adding the measurement of single top production with a $p_T$ cut. These new constraints must be taken into account in making predictions for other low-energy indirect effects of diquarks.
