Allanach B C, Bhatia D, Iyer Abhishek M
1Department of Applied Mathematics and Theoretical Physics, Centre for Mathematical Sciences, University of Cambridge, Wilberforce Road, Cambridge, CB3 0WA UK.
2Department of Theoretical Physics, Tata Institute of Fundamental Research, Homi Bhabha Road, Colaba, Mumbai, 400 005 India.
Eur Phys J C Part Fields. 2017;77(9):595. doi: 10.1140/epjc/s10052-017-5162-5. Epub 2017 Sep 8.
We examine the phenomenology of the production, at the 13 TeV Large Hadron Collider (LHC), of a heavy resonance , which decays via other new on-shell particles into multi-(i.e. three or more) photon final states. In the limit that has a much smaller mass than , the multi-photon final state may dominantly appear as a two-photon final state because the s from the decay are highly collinear and remain unresolved. We discuss how to discriminate this scenario from : rather than discarding non-isolated photons, it is better to relax the isolation criteria and instead form photon jets substructure variables. The spins of and leave their imprint upon the distribution of pseudo-rapidity gap between the apparent two-photon states. Depending on the total integrated luminosity, this can be used in many cases to claim discrimination between the possible spin choices of and , although the case where and are both scalar particles cannot be discriminated from the direct decay in this manner. Information on the mass of can be gained by considering the mass of each photon jet.
我们研究了在13 TeV大型强子对撞机（LHC）中重共振态的产生现象学，该重共振态通过其他新的在壳粒子衰变成多光子（即三个或更多）末态。在质量比小得多的极限情况下，多光子末态可能主要表现为双光子末态，因为衰变产生的光子高度共线且无法分辨。我们讨论了如何将这种情况与区分开来：与其丢弃非孤立光子，不如放宽隔离标准，转而形成光子喷注子结构变量。和的自旋会在表观双光子态之间的赝快度间隙分布上留下印记。根据总积分亮度，在许多情况下这可用于区分和可能的自旋选择，不过和都是标量粒子的情况无法用这种方式与直接衰变区分开来。通过考虑每个光子喷注的质量可以获得关于的质量信息。
