arXivDaily arXiv每日学术速递 周一至周五更新
北美退伍军人节(Veterans Day),12 日无更新
arXiv 1007.0395hep-ex
收藏

反常的类号双μ子电荷不对称性的证据

Evidence for an anomalous like-sign dimuon charge asymmetry

D0 Collaboration, V. Abazov et al

摘要:

我们在费米实验室Tevatron对撞机上用D 0探测器记录了6.1~fb $^{-1}$的$p\bar{p}$碰撞中类号双μ子事件的电荷不对称性$A\equiv(N^{++} - N^{--})/(N^{++} + N^{--})$,其质心能量为$\sqrt{s}=1.96$ ~TeV.从$A$中提取出半轻子$b$ -强子衰变中的同号双μ子电荷不对称性:$\aslb=-0.00957\pm0.00251\thinspace({\rm stat})\pm0.00146\thinspace({\rm sys})$ .它与标准模型预测的$\aslb({\rm SM})=(-2.3^{+0.5}_{-0.6})\times10^{-4}$相差3.2个标准偏差,首次提供了中性$B$介子混合中反常$CP$破坏的证据.

英文摘要:

We measure the charge asymmetry $A\equiv(N^{++} - N^{--})/(N^{++} + N^{--})$ of like-sign dimuon events in 6.1~fb$^{-1}$ of $p\bar{p}$ collisions recorded with the D0 detector at a center-of-mass energy $\sqrt{s}=1.96$~TeV at the Fermilab Tevatron collider. From $A$ we extract the like-sign dimuon charge asymmetry in semileptonic $b$-hadron decays: $\aslb=-0.00957\pm0.00251\thinspace({\rm stat})\pm0.00146\thinspace({\rm sys})$. It differs by 3.2~standard deviations from the standard model prediction $\aslb({\rm SM})=(-2.3^{+0.5}_{-0.6})\times10^{-4}$, and provides first evidence of anomalous $CP$ violation in the mixing of neutral $B$ mesons.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑