Complex decay chains of top and bottom squarks

Eckel, Jonathan; Su, Shufang; Zhang, Huanian

doi:10.1007/jhep07(2015)075

Cited by 8 publications

(11 citation statements)

References 51 publications

(61 reference statements)

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“…This is apparently consistent with the The single top-squark with lighter chargino production within natural SUSY has been studied in [36,37]. In [38], the authors have considered varieties of complex decay chains of lighter topsquark to find their signatures at the LHC.…”

Section: Introductionsupporting

confidence: 67%

Production of a light top-squark pair in association with a light non-SM Higgs boson within the NMSSM from proton–proton collisions at s = 13 TeV and 33 TeV

Das

Fraga

Ávila

2019

Int. J. Mod. Phys. A

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We study the potential of the LHC accelerator, and a future 33 TeV proton collider, to observe the production of a light top squark pair in association with the lightest Higgs boson (t 1t1 h 1 ), as predicted by the Next-to-Minimal Supersymmetric Standard Model (NMSSM). We scan randomly about ten million points of the NMSSM parameter space, allowing all possible decays of the lightest top squark and lightest Higgs boson, with no assumptions about their decay rates, except for known physical constraints such as perturbative bounds, Dark matter relic density consistent with recent Planck experiment measurements, Higgs mass bounds on the next to lightest Higgs boson, h 2 , assuming it is consistent with LHC measurements for the Standard Model Higgs boson, LEP bounds for the chargino mass and Z invisible width, experimental bounds on B meson rare decays and some LHC experimental bounds on SUSY particle spectra different to the particles involved in our study. We find that for low mass top-squark, the dominating decay mode ist 1 → bχ ± 1 withχ ± 1 → Wχ 0 1 . We use three bench mark points with the highest cross sections, which naturally fall within the compressed spectra of the top squark, and make a phenomenological analysis to determine the optimal event selection that maximizes the signal significance over backgrounds. We focus on the leptonic decays of both W 's and the decay of lightest Higgs boson into b-quarks (h 1 → bb). Our results show that the high luminosity LHC will have limitations to observe the studied signal and only a proton collider with higher energy will be able to observe the SUSY scenario studied with more than three standard deviations over background. * symmetry breaking mechanism in the SM and opens up the second part, which is mandatory to establish the exact nature of the symmetry breaking mechanism and, eventually, identify the possible effects of Supersymmetry (SUSY). The available SUSY models at our disposal are many: minimal Supergravity (mSUGRA), Minimal Supersymmetric Standard Model (MSSM) [3], Next-to-MSSM (NMSSM) [4,5,6,7,8], etc. In our analysis we consider NMSSM model which solved the µ-problem of the MSSM. It is to be noted that the earlier development for the origin of the µ-term in Supertpoetial studied from Supergravity approach [9] and from the non-renormalization operators [10].The appealing of SUSY over the SM leads to an enlarged particle spectrum. As none of the SUSY particles has been discovered by any high energy collider experiment yet, SUSY must be broken. Various scenarios of the breaking mechanism have been developed in the past few decades. The top quark, the heaviest particle among the SM quark sector, having a large Yukawa coupling, has a superpartner called the top-squark, which is expected to be the lightest among all the sparticles in the enlarged squark sector, except for the gaugino sectors, like neutralinos and charginos. The light top-squark is theoretically favored from the stabilization of the Higgs potential, as well as from the longitudinal scattering ...

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Section: Introductionsupporting

confidence: 67%

Production of a light top-squark pair in association with a light non-SM Higgs boson within the NMSSM from proton–proton collisions at s = 13 TeV and 33 TeV

Das

Fraga

Ávila

2019

Int. J. Mod. Phys. A

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“…These are shown for both the bino-dominated LSP (left) and the singlino-dominated LSP (right) cases. Note 11 Various strategies to probe the stops squarks in difficult situations with compressed spectrum are proposed in the literature (see, for example, references [112][113][114] and references therein). Table 4.…”

Section: Diagrammentioning

confidence: 99%

Two light stops in the NMSSM and the LHC

Beuria

Chatterjee

Datta

et al. 2015

J. High Energ. Phys.

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Abstract:We study the viability of having two relatively light top squarks ('stops') in the framework of the Next-to-Minimal Supersymmetric Standard Model (NMSSM). Such light stops render the NMSSM rather 'natural'. These are shown to be allowed by the relevant direct searches at the Large Hadron Collider (LHC) and to be compatible with the latest LHC results on the Higgs sector, other low energy electroweak constraints and recent constraints from the dark matter (DM) sector. We propose dedicated searches for such light stops at the LHC within a 'simplified' scenario that may have a bino-like or a singlino-like neutralino LSP as the DM candidate and point out various final states carrying the imprint of their collective presence. Under certain circumstances, in such a scenario, presence of two light stops may give rise to final states which are not so typical in their search. Thorough studies at the detector level reveal the status of such a scenario after the 8 TeV run of the LHC and shed light on the prospects of its 13 and 14 TeV runs. In favorable regions of the NMSSM parameter space, with low-lying spectra, signals with significance 5σ are possible with a few tens to a few hundreds of fb −1 of integrated luminosity in diverse final states.

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“…Top squarks decaying to a top quark along with a neutralino (LSP or NLSP) has also been probed in various SUSY models. A lower limit close to 1 TeV for the top squark mass can be obtained at √ s =14 TeV and with the high luminosity option [114][115][116]. In addition, thorough phenomenological studies have also been performed in the decay of top squark into a bottom quark and a chargino [117,118].…”

Section: Bounds On Top Squarksmentioning

confidence: 98%

Light top squarks in aU(1)Rlepton number model with a right handed neutrino and the LHC

Chakraborty¹,

Datta²,

Huitu³

et al. 2016

Phys. Rev. D

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Light top squarks in U (1) R lepton number model with a right handed neutrino and the LHC We investigate the phenomenology of top squarks at the Large Hadron Collider (LHC) in a supersymmetric model where lepton number is identified with an approximate U (1)R symmetry in such a way that one of the left chiral sneutrinos can acquire a large vacuum expectation value (vev) and can play the role of the down-type Higgs. This R-symmetry allows a subset of trilinear R-parity violating interactions, which determine the collider phenomenology of this model in a significant way. The gauginos are Dirac particles and gluinos are relatively heavy in this class of models. The model contains a right handed neutrino superfield, which gives a tree level mass to one of the active neutrinos. An order one neutrino Yukawa coupling also helps enhance the Higgs boson mass at the tree level and results in a very light bino-like neutralino ( χ 0 2 ) with mass around a few hundred MeV, which is a carrier of missing (transverse) energy (✚ ET ). The model can accommodate two rather light top squarks, compatible with the observed mass of the Higgs boson. The lighter top squark ( t1) can decay into t χ 0 2 , and thus the signal would be similar to the signal of top quark pair production at the LHC. In addition, fully visible decays such as t2 → be + can give rise to interesting final states. Such signals at the LHC combined with other features like a heavy gluino could provide a strong evidence for this kind of a model. Our analysis shows that m t 1 < ∼ 575 (750) GeV and m t 2 < ∼ 1.2 (1.4) TeV can be probed with 5σ statistical significance at the 13 TeV LHC with 300 (3000) fb −1 of integrated luminosity. Finally, we observe that in the presence of super-light carriers of ✚ ET , the so-called 'stealth' top squark scenario may naturally appear in our model. I. INTRODUCTIONThe discovery of a Higgs boson at the Large Hadron Collider (LHC) with a mass around 125 GeV [1, 2] is of immense importance in high energy physics and, in particular, in the context of electroweak symmetry breaking. However, in spite of its enormous success over the years, the Standard Model (SM) of particle physics suffers from several drawbacks. From a theoretical perspective, the naturalness problem remains a troublesome issue in the framework of SM. Supersymmetry (SUSY) renders an elegant solution to this problem and has become the most popular choice for physics beyond the standard model (BSM) to date. Nevertheless, searches for superpartners by the LHC collaborations (ATLAS and CMS) in pp collisions at the centre-of-mass energies of √ s = 7 TeV and 8 TeV have shown no significant excess [3,4] over the SM background. This has put stringent lower limits on the superpartner masses in many different SUSY scenarios. Recent experimental analyses within the framework of a simplified phenomenological minimal supersymmetric standard model (pMSSM) have set a lower bound of 1.7 TeV [5] for comparable masses of the gluino and the first two generation squarks.On top of that, find...

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Complex decay chains of top and bottom squarks

Cited by 8 publications

References 51 publications

Production of a light top-squark pair in association with a light non-SM Higgs boson within the NMSSM from proton–proton collisions at s = 13 TeV and 33 TeV

Production of a light top-squark pair in association with a light non-SM Higgs boson within the NMSSM from proton–proton collisions at s = 13 TeV and 33 TeV

Two light stops in the NMSSM and the LHC

Light top squarks in aU(1)Rlepton number model with a right handed neutrino and the LHC

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