论文标题
在LHC上搜索与质子标记和定时探测器的异常顶部夸克相互作用
Searching for anomalous top quark interactions with proton tagging and timing detectors at the LHC
论文作者
论文摘要
我们研究了在两光融合中产生的新型宽中性共振的LHC敏感性，并腐烂到顶级夸克对，$γγ\ to t \ bar {t} $。这是在质子 - 普罗顿碰撞中的中央独家$ t \ bar {t} $生产中探测的，$ pp \ to p t \ bar {t} p $。我们使用PPS（CMS）和AFP（ATLAS）对完整质子的标签，并考虑半leptonic $ t \ bar t $通道。灵敏度还映射到一组尺寸-8 $γγT\ bar {t} $ operators以较大的质量限制。使用完整质子与重建的$ t \ bar {t} $系统之间的运动学相关性，我们对dimension-8运算符的耦合的敏感性为$ 1.4 \ cdot 10^{ - 11}}}〜\ mathrm {gev}^gev}^{ - 4}^{ - 4} $ at 95％cl。如果在未来的测量值中，质子飞行器的精确度为20 ps，则对异常耦合的敏感性可显着提高至$ 7 \ cdot 10^{ - 12}〜\ mathrm {gev}^{ - 4} $。使用计时信息时，对广泛中性共振的95％Cl敏感性达到了$ 1500〜 \ MATHRM {GEV} $的订单。
We study the LHC sensitivity to new broad neutral resonances produced in two-photon fusion and decaying to a top quark pair, $γγ\to t\bar{t}$. This is probed in central exclusive $t\bar{t}$ production in proton-proton collisions, $pp \to p t\bar{t} p$. We use the tagging of the intact protons by PPS (CMS) and AFP (ATLAS) and consider the semi-leptonic $t\bar t$ channel. The sensitivity is also mapped onto a set of dimension-8 $γγt\bar{t}$ operators in the large mass limit. Using the kinematical correlations between the intact protons and the reconstructed $t\bar{t}$ system, we obtain a sensitivity to the couplings of the dimension-8 operators of $1.4 \cdot 10^{-11}~\mathrm{GeV}^{-4}$ at 95% CL. The sensitivity to the anomalous couplings is significantly improved down to about $7\cdot 10^{-12}~\mathrm{GeV}^{-4}$ if the proton time-of-flight is known with a precision of 20 ps in future measurements. The 95% CL sensitivity to broad neutral resonances reaches masses of order $ 1500~\mathrm{GeV} $ when using timing information.
