论文标题
从Gluon融合
Disentangling new physics effects on non-resonant Higgs boson pair production from gluon fusion
论文作者
论文摘要
从Gluon Fusion，非SM Higgs三线性自我耦合$λ_{HHH} $或在环路中运行的新有色粒子，对非共鸣二基的过程有两种新的物理作用。为了解散不同的新物理贡献，我们研究了它们在运动学分布中的特征。假设观察到总横截面大约是SM期望的三倍，我们考虑$λ_{hhh}/λ_{hhh}^{\ rm sm} = -0.5，5.5 $的情况以及具有重型矢量Quarks的新物理学，在Type-ii ii type-ii两型HIG GIGS double double double doupd flibe quarks中，称为双Higs double double double vl。在确切的错误符号极限中提出了一个合理的基准点，在此，在HIGGS玻色子上，上型VLQ和向下型VLQ耦合之间的相反符号导致他们从Gluon Fusion中取消了它们对单higgs生产的贡献。由于循环中重VLQ的阈值影响，VLQ-2HDM可容纳Higgs Boson对不变质量的凸起（$ M_ {HH} $）和Higgs Boson的横向动量（$ P_T^H $）。两个凸起的位置与$ m_ {hh} \ simeq 2 m _ {\ rm vlq} $和$ p_t^h \ simeq m _ {\ rm vlq} $。此外，位于重VLQ质量的颠簸自然会提起$ m_ {hh} $，$ p_t^h $发行量为高质量和高$ P_T^H $区域。另一方面，非SM HIGGS三联耦合案例的分布转移到低$ m_ {hh} $和$ p_t^h $区域。因此，具有高$ M_ {HH} $和高$ P_T^H $的运动区域将是VLQ-2HDM的吸烟枪信号。还执行了DI-HIGGS信号的完整HL-LHC模拟，确认$ b \ bar {b} b \ bar {b} $最终状态可以区分VLQ-2HDM。
There are two kinds of new physics effects on non-resonant di-Higgs process from gluon fusion, non-SM Higgs trilinear self-coupling $λ_{hhh}$ or new colored particles running in the loop. With the aim of disentangling different new physics contributions, we study their characteristics in the kinematic distributions. Assuming that the total cross section is observed to be about three times as large as the SM expectation, we consider the cases of $λ_{hhh}/λ_{hhh}^{\rm SM} =-0.5, 5.5$ as well as a new physics model with heavy vectorlike quarks in a type-II two Higgs double model, called the VLQ-2HDM. A reasonable benchmark point is suggested in the exact wrong-sign limit, where the opposite sign between the up-type VLQ and down-type VLQ couplings to the Higgs boson causes the cancellation of their contributions to the single-Higgs production from gluon fusion. Because of the threshold effects from the heavy VLQs in the loop, the VLQ-2HDM accommodates the bumps in the distributions of the invariant mass of the Higgs boson pair ($M_{hh}$) and the transverse momentum of a Higgs boson ($p_T^h$). The positions of two bumps are closely related as $ M_{hh} \simeq 2 M_{\rm VLQ}$ and $p_T^h \simeq M_{\rm VLQ}$. In addition, the bumps located at the heavy VLQ mass naturally lift up the $M_{hh}$ and $p_T^h$ distributions into high-mass and high-$p_T^h$ regions. On the other hand, the non-SM Higgs trilinear coupling cases have the distributions shift into low $ M_{hh}$ and $p_T^h$ regions. Therefore, the kinematic region with high $M_{hh}$ and high $p_T^h$ will be a smoking-gun signal for the VLQ-2HDM. Full HL-LHC simulations for the di-Higgs signals are also performed, confirming that the $b \bar{b} b \bar{b}$ final state can distinguish the VLQ-2HDM.
