Z−Z′ mixing and oblique corrections in anSU(3)×U(1) model

Liu, James T.; Ng, Daniel

doi:10.1007/bf01574173

Cited by 41 publications

(34 citation statements)

References 20 publications

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“…In the latter setup the Z would be the mediator and therefore our bounds would apply up to some extent, because the couplings of the Z boson on those models are not so different from the model we investigate here. Moreover, these limits are complementary to other limits coming from colliders [37], Flavor Changing Neutral Current processes [38][39][40][41][42][43][44][45][46], electroweak corrections to the S,T,U parameters [47][48][49][50][51], and from muon decay [52,53]. More importantly, the limits on the mass of the Z found here imply a bound on the scale of symmetry breaking that forces all particle masses to lie at a few TeV, if one considers all couplings to be of order 1.…”

Section: Direct Detection and Bounds On The Zmentioning

confidence: 95%

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Constraining the $$Z^{\prime }$$ Z ′ mass in 331 models using direct dark matter detection

Profumo

Queiroz

2014

Eur. Phys. J. C

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We investigate a so-called 331 extension of the Standard Model gauge sector which accommodates neutrino masses and where the lightest of the new neutral fermions in the theory is a viable particle dark matter candidate. In this model, processes mediated by the additional Z gauge boson set both the dark matter relic abundance and the scattering cross section off of nuclei. We calculate with unprecedented accuracy the dark matter relic density, including the important effect of coannihilation across the heavy fermion sector, and show that indeed the candidate particle has the potential of having the observed dark matter density. We find that the recent LUX results put very stringent bounds on the mass of the extra gauge boson, M Z 2 TeV, independently of the dark matter mass. We also comment on the regime where our bounds on the Z mass may apply to generic 331-like models, and on implications for LHC phenomenology.

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Section: Direct Detection and Bounds On The Zmentioning

confidence: 95%

“…[37] do apply to our model. A variety limits have been placed on the mass of this boson and they come from different sources [38][39][40][41][42][43][44][45][46][47][48][49][50][51][52][53] and from different models. In summary, the bounds derived here on the mass of this boson are complementary to those.…”

Section: • Fermionsmentioning

confidence: 99%

Constraining the $$Z^{\prime }$$ Z ′ mass in 331 models using direct dark matter detection

Profumo

Queiroz

2014

Eur. Phys. J. C

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“…Furthermore, the use of platinum-based electrocatalysts in direct methanol fuel cells is blocked by the methanol crossover effect. To date, extensive efforts have been devoted to overcome these problems by using Pt-based alloys, [184][185][186][187][188][189] non-noble metals, [190][191][192][193] and enzymes 194,195 to replace Pt-based electrocatalysts. Nitrogen-doped graphene has also been reported to have high electrocatalytic activities and durability, because of its atom-thick 2D structure and high conductivity.…”

Section: Catalystsmentioning

confidence: 99%

Graphene/polymer composites for energy applications

Sun

Shi

2012

J Polym Sci B Polym Phys

234

120

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Graphene has wide potential applications in energyrelated systems, mainly because of its unique atom-thick twodimensional structure, high electrical or thermal conductivity, optical transparency, great mechanical strength, inherent flexibility, and huge specific surface area. For this purpose, graphene materials are frequently blended with polymers to form composites, especially when fabricating flexible devices. Graphene/polymer composites have been explored as electrodes of supercapacitors or lithium ion batteries, counter electrodes of dye-sensitized solar cells, transparent conducting electrodes and active layers of organic solar cells, catalytic electrodes, and polymer electrolyte membranes of fuel cells. In this review, we summarize the recent advances on the synthesis and applications of graphene/polymer composites for energy applications. The challenges and prospects in this field have also been discussed. V C 2012 Wiley Periodicals, Inc. J. Polym. Sci., Part B: Polym. Phys. 2013, 51, 231-253 KEYWORDS: composites; energy; fuel cell; graphene; lithium ion battery; redox polymers; solar cell; supercapacitor; synthesis INTRODUCTION Energy is one of the most important recent topics of concern to human society. To replace conventional fossil fuels, clean and renewable energies based on sunlight, wind, new chemicals, and biofuels are urgently demanded. Therefore, materials that can directly convert or store renewable energies are being extensively studied. Among them, graphene has recently attracted a great deal of attention because of its unique atom-thick two-dimensional (2D) structure 1,2 and excellent electrical, 2 thermal, 3 optical, and mechanical properties. 4,5 Graphene is a promising material for applications in various energy-related systems such as supercapacitors, 6-9 secondary batteries, 10-14 solar cells, 15-17 and fuel cells. [18][19][20] For this purpose, graphene materials are frequently blended with polymers to form functional composites. [21][22][23] The polymer component can improve the processability and/or flexibility of graphene materials, and also possibly provide them with new functions. To date, various graphene composites with insulating or conducting polymers (CPs) have been prepared through noncovalent 22 or covalent approaches. 24 They have also been applied as electrodes for supercapacitors and lithium ion batteries (LIBs), 25-29 counter electrodes of dye-sensitized solar cells (DSSCs), 15,30,31 and transparent conducting electrodes (TCEs) 32,33 or active layers of organic solar cells, 34 catalytic electrodes, and polymer electrolyte membranes of fuel cells. [35][36][37] This review focuses on summarizing the recent advances in the synthesis of graphene/polymer composites and their energy applications.

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“…We have done this for the SU(3)×U(1) model [17] and found that the effects are quite small since the new quark T is a SU(2) × U(1) vector [29]. While isospin mixing plays a role, the additional terms are proportional to both [15,16].…”

Section: Discussionmentioning

confidence: 99%

The effect of new physics on

Liu¹,

Ng²

1995

Physics Letters B

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Motivated by the ∼ 2σ discrepancy between the experimental value for R b and the theoretical prediction of the Standard Model, we examine the effect of new physics on the Z-b-b vertex. Using general results for both new scalars and gauge bosons, we show that two conditions must be satisfied in order for new physics to give observable deviations in the vertex. In particular, the fermion in the loop must transform chirally under SU (2) × U (1) and it must be massive compared to the exchanged boson. We examine the implications of these results on the 2 Higgs Doublet model and the Left-Right Symmetric model.

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Z−Z′ mixing and oblique corrections in anSU(3)×U(1) model

Cited by 41 publications

References 20 publications

Constraining the $$Z^{\prime }$$ Z ′ mass in 331 models using direct dark matter detection

Constraining the $$Z^{\prime }$$ Z ′ mass in 331 models using direct dark matter detection

Graphene/polymer composites for energy applications

The effect of new physics on

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