Spontaneous R-parity breaking, stop LSP decays and the neutrino mass hierarchy

Маршалл, З.; Ovrut, Burt A.; Purves, Austin; Spinner, Sogee

doi:10.1016/j.physletb.2014.03.052

Cited by 33 publications

(63 citation statements)

References 60 publications

(70 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…A further study of the Wilson lines, spectra, mass scales and the unification of gauge couplings from the high-energy superstring point of view was presented in [30]. Combining the bottom-up and top-down approaches to the B − L MSSM, various aspects of both LHC and neutrino phenomenology were studied in the special case where a stop or a sbottom sparticle is the lightest supersymmetric particle (LSP) [31,32].…”

Section: Jhep06(2015)182mentioning

confidence: 99%

“…For LHC studies, see [17,18] as well as recent work on stop and sbottom LSP's in this context and the connection between their decays and the neutrino sector [31,32]. Predictions for the neutrino sector were discussed in [16,34,35].…”

Section: Jhep06(2015)182mentioning

confidence: 99%

“…In this paper, we impose these bounds except in the case of a stop or sbottom LSP. These two cases were explicitly studied in [31,32] and yielded the following lower bounds:…”

Section: Collider Constraintsmentioning

confidence: 99%

See 2 more Smart Citations

The minimal SUSY B − L model: from the unification scale to the LHC

Ovrut

Purves

Spinner

2015

J. High Energ. Phys.

Self Cite

151

View full text Add to dashboard Cite

This paper introduces a random statistical scan over the high-energy initial parameter space of the minimal SUSY B − L model -denoted as the B − L MSSM. Each initial set of points is renormalization group evolved to the electroweak scale -being subjected, sequentially, to the requirement of radiative B − L and electroweak symmetry breaking, the present experimental lower bounds on the B − L vector boson and sparticle masses, as well as the lightest neutral Higgs mass of ∼125 GeV. The subspace of initial parameters that satisfies all such constraints is presented, shown to be robust and to contain a wide range of different configurations of soft supersymmetry breaking masses. The lowenergy predictions of each such "valid" point -such as the sparticle mass spectrum and, in particular, the LSP -are computed and then statistically analyzed over the full subspace of valid points. Finally, the amount of fine-tuning required is quantified and compared to the MSSM computed using an identical random scan. The B − L MSSM is shown to generically require less fine-tuninng.

show abstract

Section: Jhep06(2015)182mentioning

confidence: 99%

Section: Jhep06(2015)182mentioning

confidence: 99%

See 1 more Smart Citation

The minimal SUSY B − L model: from the unification scale to the LHC

Ovrut

Purves

Spinner

2015

J. High Energ. Phys.

Self Cite

151

View full text Add to dashboard Cite

show abstract

“…The top squark LSP has been more widely considered in the literature, as it is naturally lighter than the other squarks, even for RPC; see for example [169][170][171]. The decays viā UDD operators are discussed in Sect.…”

Section: Squark Lspmentioning

confidence: 99%

R-parity violation at the LHC

Dercks

Dreiner²,

Krauss³

et al. 2017

Eur. Phys. J. C

View full text Add to dashboard Cite

We investigate the phenomenology of the MSSM extended by a single R-parity-violating coupling at the unification scale. For all R-parity-violating couplings, we discuss the evolution of the particle spectra through the renormalization group equations and the nature of the lightest supersymmetric particle (LSP) within the CMSSM, as an example of a specific complete supersymmetric model. We use the nature of the LSP to classify the possible signatures. For each possible scenario we present in detail the current LHC bounds on the supersymmetric particle masses, typically obtained using simplified models. From this we determine the present coverage of R-parity-violating models at the LHC. We find several gaps, in particular for a stau-LSP, which is easily obtained in R-parity-violating models. Using the program CheckMATE we recast existing LHC searches to set limits on the parameters of all R-parity-violating CMSSMs. We find that virtually all of them are either more strongly constrained or similarly constrained in comparison to the R-parity-conserving CMSSM, including theŪDD models. For each R-parity-violating CMSSM we then give the explicit lower mass bounds on all relevant supersymmetric particles.

show abstract

“…Note again that our consideration is pretty conservative and, as we would find in section VI, for generic scenarios where such a decay can have a branching fraction below 50%, the bounds can get considerably weaker thus allowing for an even lighter t 2 . Phenomenological discussions on top squarks undergoing such an R-parity violating decay can be found in references [101][102][103][104][105][106][107].…”

Section: Bounds On Top Squarksmentioning

confidence: 99%

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

View full text Add to dashboard Cite

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...

show abstract

Spontaneous R-parity breaking, stop LSP decays and the neutrino mass hierarchy

Cited by 33 publications

References 60 publications

The minimal SUSY B − L model: from the unification scale to the LHC

The minimal SUSY B − L model: from the unification scale to the LHC

R-parity violation at the LHC

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

Contact Info

Product

Resources

About