Disentangling new physics effects on nonresonant Higgs boson pair production from gluon fusion

被引：13

作者：

Cheung, Kingman ^{[1
,2
,3
]}

Jueid, Adil ^{[1
]}

Lu, Chih-Ting ^{[4
]}

Song, Jeonghyeon ^{[1
]}

Yoon, Yeo Woong ^{[5
]}

机构：

[1] Konkuk Univ, Dept Phys, 120 Neungdong Ro, Seoul 05029, South Korea

[2] Natl Ctr Theoret Sci, Phys Div, Hsinchu, Taiwan

[3] Natl Tsing Hwa Univ, Dept Phys, Hsinchu 300, Taiwan

[4] KIAS, Sch Phys, 85 Hoegiro, Seoul 02455, South Korea

[5] Seoul Tech, Sch Liberal Arts, Seoul 139743, South Korea

来源：

PHYSICAL REVIEW D | 2021年 / 103卷 / 01期

基金：

新加坡国家研究基金会;

关键词：

ELECTROWEAK SYMMETRY-BREAKING; VECTOR-LIKE QUARKS; SINGLE PRODUCTION; COLLISIONS; SEARCH;

D O I：

10.1103/PhysRevD.103.015019

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We study the kinematic characteristics of the loop-induced effects on nonresonant Higgs pair production via gluon fusion in a type-II two Higgs doublet model with heavy vectorlike quarks. First, we performed a comprehensive analysis of the model phenomenology, suggesting an ansatz to satisfy theoretical and experimental constraints. Contrary to the usual expectation, the loop-induced effects can highly enhance the di-Higgs rate if the Higgs sector is extended into the wrong-sign limit (kappa(t) = -kappa(b) = 1): the total cross section can be about three times as large as the SM expectation. As anomalous Higgs trilinear self-coupling of lambda(hhh)/lambda(SM)(hhh) = -0.5, 5.5 similarly enhances the di-Higgs rate, we made a comparative study focusing on the kinematic distributions. The threshold effects from the vectorlike quarks generate the correlated bumps in the distributions of the invariant mass of the Higgs boson pair and the transverse momentum of a Higgs boson, located at M-hh similar or equal to 2MV(LQ) and p(T)(h) similar or equal to M-VLQ. Each bump has a long tail stretching toward the high region. The anomalous lambda(hhh) cases shift the distributions into low regions. In addition, we show the kinematic difference between the loop-induced effects and an s-channel wide resonance. Therefore, the kinematic regimes with high M-hh and high p(T)(h) would have high potential to probe the loop-induced effects on the di-Higgs process, which is shown through full HL-LHC simulations in the b (b) over barb (b) over bar and b (b) over bar gamma gamma final states.

引用

页数：20

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