Papaefstathiou Andreas, Tetlalmatzi-Xolocotzi Gilberto
1Institute for Theoretical Physics Amsterdam and Delta Institute for Theoretical Physics, University of Amsterdam, Science Park 904, 1098 XH Amsterdam, The Netherlands.
2Nikhef, Theory Group, Science Park 105, 1098 XG Amsterdam, The Netherlands.
Eur Phys J C Part Fields. 2018;78(3):214. doi: 10.1140/epjc/s10052-018-5701-8. Epub 2018 Mar 13.
We investigate extremely rare top quark decays at a future proton-proton collider with centre-of-mass energy of 100 TeV. We focus on two decay modes: radiative decay with a boson, , and flavour-changing neutral decay with a Higgs boson, , the former being kinematically suppressed with a branching ratio of (Altarelli et al., Phys Lett B 502:125-132, 2001), and the latter highly loop-suppressed, with a branching ratio of (Aguilar-Saavedra, Acta Phys Polon B 35:2695-2710, 2004). We find that will be very challenging to observe in top quark pair production, even within well-motivated beyond-the-standard model scenarios. For the mode we find a stronger sensitivity than that obtained by any future LHC measurement by at least one order of magnitude.
我们研究了在未来质心能量为100 TeV的质子-质子对撞机上极其罕见的顶夸克衰变。我们关注两种衰变模式：与玻色子相关的辐射衰变，即 ，以及与希格斯玻色子相关的味改变中性衰变，即 ，前者在运动学上受到抑制，分支比为 （阿尔塔雷利等人，《物理快报B》502:125 - 132，2001年），后者受到高度的圈抑制，分支比为 （阿吉拉尔 - 萨维德拉，《波兰物理学报B》35:2695 - 2710，2004年）。我们发现，即使在动机充分的超出标准模型的情景中，在顶夸克对产生过程中观测到 也将极具挑战性。对于 模式，我们发现其灵敏度比未来任何大型强子对撞机测量所获得的灵敏度至少强一个数量级。
