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1. chinaXiv:201612.00436 [pdf]

Probing Natural SUSY from Stop Pair Production at the LHC

Cao,J; Han,C; Wu,L; Yang,JM; Zhang,Y

We consider the natural supersymmetry scenario in the framework of the R-parity conserving minimal supersymmetric standard model (called natural MSSM) and examine the observability of stop pair production at the LHC. We first scan the parameters of this s

submitted time 2016-12-28 Hits2130Downloads1147 Comment 0

2. chinaXiv:201612.00422 [pdf]

Current experimental bounds on stop mass in natural SUSY

Han,C; Hikasa,K; Wu,L; Yang,JM; Zhang,Y

Motivated by the recent progress of direct search for the productions of stop pair and sbottom pair at the LHC, we examine the constraints of the search results on the stop (t ? ) mass in natural SUSY. We first scan the parameter space of natural SUSY in the framework of MSSM, considering the constraints from the Higgs mass, B-physics and electroweak precision measurements. Then in the allowed parameter space we perform a Monte Carlo simulation for stop pair production followed by t ? → tχ ?0 or t ? → bχ ?+ and sbottom pair production followed by ?b → bχ ?0 or ?b → tχ ??. 1111 1111 Using the combined results of ATLAS with 20.1 fb?1 from the search of l + jets + E/ T , hadronic tt ?+E/T and 2b+E/T, we find that a stop lighter than 600 GeV can be excluded at 95% CL in this scenario.

submitted time 2016-12-28 Hits2128Downloads1216 Comment 0

3. chinaXiv:201612.00416 [pdf]

Pseudo-goldstino and electroweak gauginos at the LHC

Hikasa,K; Liu,T; Wang,L; Yang,JM

The multi-sector SUSY breaking predicts the existence of pseudo-goldstino, which could couple more strongly to visible fields than ordinary gravitino. Then the lightest neutralino and chargino can decay into a pseudo-goldstino plus a Z-boson, Higgs boson

submitted time 2016-12-28 Hits1901Downloads1049 Comment 0

4. chinaXiv:201612.00412 [pdf]

New approach for detecting a compressed bino/wino at the LHC

Han,C; Wu,L; Yang,JM; Zhang,M; Zhang,Y

In some supersymmetric models like split supersymmetry or models with non-universal gaugino mass, bino (LSP) and winos (NLSP) may have rather small mass splitting in order to provide the correct dark matter relic density through bino/wino co-annihilation. Such a scenario with the compressed bino/wino is difficult to explore at the LHC. In this work we propose to probe this scenario from pp → jχ ?02χ ?±1 followed by χ ?02 → γχ ?01 and χ ?±1 → W?χ ?01 → l±νχ ?01 (this method is also applicable to the compressed bino/higgsino scenario). Through a detailed Monte Carlo simulation for both the signal and the backgrounds, we find that for a mass splitting ?M ? 5 ? 15 GeV between bino (LSP) and wino (NLSP), the 14 TeV LHC with luminosity of 500fb?1 can probe the wino up to 150 GeV (the sensitivity can reach 5σ for ?M = 5 GeV and 2σ for ?M = 15 GeV). We also investigate the dark matter detection sensitivities for this scenario and find that the planned XENON-1T(2017) cannot fully cover the parameter space with wino below 150 GeV allowed by relic density and the LUX limits.

submitted time 2016-12-28 Hits2065Downloads1181 Comment 0

5. chinaXiv:201612.00409 [pdf]

Pseudo-goldstino and electroweakinos via VBF processes at LHC

Liu,T; Wang,L; Yang,JM

The multi-sector SUSY breaking predicts pseudo-goldstino which can couple to the visible sector more strongly than the ordinary gravitino and thus induce the decays of the lightest neutralino and chargino (collectively called electroweakinos) inside the d

submitted time 2016-12-28 Hits1524Downloads836 Comment 0

6. chinaXiv:201612.00401 [pdf]

Single top squark production as a probe of natural supersymmetry at the LHC

Hikasa,K; Li,J; Wu,L; Yang,JM

Light top squarks (stops) and light higgsinos are the key features of natural supersymmetry (SUSY), where the higgsinos χ?1± and χ?1,20 are nearly degenerate and act as the missing transverse energy (ET) at the LHC. Besides the pair production via strong

submitted time 2016-12-28 Hits1781Downloads1040 Comment 0

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