Resonant Higgs pair production as a probe of stop at the LHC

Abstract

Searching for top squark (stop) is a crucial task of the LHC. When the flavor conserving two body decays of the stop are kinematically forbidden, the stops produced near the threshold will live long enough to form bound states which subsequently decay through annihilation into the Standard Model (SM) final states. In the region of stop mixing angle θt → 0 or π/2, we note that the LHC-13 TeV diphoton resonance data can give a strong bound on the spin-0 stoponium (ηt) and exclude the constituent stop mass mt up to about 290 GeV. While in the large stop mixing region, the stoponium will dominantly decay to the Higgs pair. By analyzing the process pp → ηt → h(→ bb)h(→ τ + τ − ), we find that a large portion of the parameter space on the mt 1 -θt plane can be probed at 2σ significance level at the LHC with the luminosity L = 3000 fb −1 .

Mono-top signature from stop decay at the HE-LHC

“…TeV within the framework of minimal supersymmetric standard model (MSSM) [3][4][5][6][7]. So if we want to test SUSY naturalness, searching for light stops in collider is very important [8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24].…”

Probing stop pair production at the LHC with graph neural networks

“…Thus the ISR/FSR jet (plus the heavy quark tagging) is needed to trigger these stop events [16][17][18]. In addition, other miscellaneous cut-flow based studies of stop searches in different parameter space have been performed at the LHC [19][20][21][22][23][24][25][26][27][28][29][30][31][32][33][34][35][36][37]. A vast number of experimental searches for stop pair productions have been also devoted at the LHC in the past few years [38][39][40][41][42][43].…”

Constraining slepton and chargino through compressed top squark search

“…If the top squark has considerable lifetime, it can form stoponium bound state which eventually decays to SM particles. Searching for the stoponium [30][31][32] is shown to be sensitive to the compressed region of top squark. Compressed top squark is also searched for the case in which it is produced in association with a Z boson or a Higgs from the decay of the heavier top squark assuming that is accessible at the collider [33][34][35][36].…”