scholarly journals Flipped $$\mathbf {g_\mu - 2}$$

2021 ◽  
Vol 81 (12) ◽  
Author(s):  
John Ellis ◽  
Jason L. Evans ◽  
Natsumi Nagata ◽  
Dimitri V. Nanopoulos ◽  
Keith A. Olive
Keyword(s):  
Standard Model ◽  
Supersymmetry Breaking ◽  
Model Calculation ◽  
Experimental Measurement ◽  
The Other ◽  
Gaugino Mass ◽  
The Standard Model ◽  
Soft Supersymmetry Breaking ◽  
The Right

AbstractWe analyze the possible magnitude of the supersymmetric contribution to $$g_\mu - 2$$ g μ - 2 in a flipped SU(5) GUT model. Unlike other GUT models which are severely constrained by universality relations, in flipped SU(5) the U(1) gaugino mass and the soft supersymmetry-breaking masses of right-handed sleptons are unrelated to the other gaugino, slepton and squark masses. Consequently, the lightest neutralino and the right-handed smuon may be light enough to mitigate the discrepancy between the experimental measurement of $$g_\mu - 2$$ g μ - 2 and the Standard Model calculation, in which case they may be detectable at the LHC and/or a 250 GeV $$e^+ e^-$$ e + e - collider, whereas the other gauginos and sfermions are heavy enough to escape detection at the LHC.

scholarly journals Possible Approach to Dynamical Supersymmetry Breaking via Nambu-Jona-Lasinio Model

2018 ◽  
Vol 182 ◽  
pp. 03002
Author(s):  
Yifan Cheng
Keyword(s):  
Standard Model ◽  
Supersymmetry Breaking ◽  
Type Model ◽  
Beyond The Standard Model ◽  
Nontrivial Solutions ◽  
Vacuum Condensate ◽  
Njl Model ◽  
The Standard Model ◽  
Interaction Term ◽  
Soft Supersymmetry Breaking

Supersymmetry is undoubtedly a popular candidate for physics beyond the Standard Model. However, the origin of soft supersymmetry breaking masses has been usually depicted intricately in the literature via extra hidden/mediating sectors. Thus, a simple theory for the generation of the soft masses would be more compelling. Here we discuss a possible approach to dynamical supersymmetry breaking via Nambu-Jona- Lasinio (NJL) Model, which has been missed since the first investigation of supersymmetric NJL model. We introduce a four-superfield interaction term that induces a real two-superfield composite with vacuum condensate. The latter has supersymmetry breaking parts, which we show to bear nontrivial solutions following a standard nonperturbative analysis for a NJL type model. The presence of the expected Goldstino state along with the supersymmetry breaking, is also verified. Moreover, the model gives rise to a composite spin one field, as its important characteristic.

scholarly journals Standard model from a supergravity model with a naturally small cosmological constant

2021 ◽  
Vol 2021 (5) ◽  
Author(s):  
Shing Yan Li ◽  
Yu-Cheng Qiu ◽  
S.-H. Henry Tye
Keyword(s):  
String Theory ◽  
Standard Model ◽  
Cosmological Constant ◽  
Supersymmetry Breaking ◽  
Supersymmetric Standard Model ◽  
Degrees Of Freedom ◽  
Interaction Terms ◽  
Supersymmetric Version ◽  
The Standard Model ◽  
Linear Version

Abstract Guided by the naturalness criterion for an exponentially small cosmological constant, we present a string theory motivated 4-dimensional $$ \mathcal{N} $$ N = 1 non-linear supergravity model (or its linear version with a nilpotent superfield) with spontaneous supersymmetry breaking. The model encompasses the minimal supersymmetric standard model, the racetrack Kähler uplift, and the KKLT anti-D3-branes, and use the nilpotent superfield to project out the undesirable interaction terms as well as the unwanted degrees of freedom to end up with the standard model (not the supersymmetric version) of strong and electroweak interactions.

Comments on the Market Crash: Six Months After

1988 ◽  
Vol 2 (3) ◽  
pp. 45-50 ◽  
Author(s):  
Hayne Leland ◽  
Mark Rubinstein
Keyword(s):  
Standard Model ◽  
Real Life ◽  
The Other ◽  
Financial Equilibrium ◽  
The Standard Model ◽  
Trading Mechanisms

Six months after the market crash of October 1987, we are still sifting through the debris searching for its cause. Two theories of the crash sound plausible -- one based on a market panic and the other based on large trader transactions -- though there is other evidence that is difficult to reconcile. If we are to believe the market panic theory or the Brady Commission's theory that the crash was primarily caused by a few large traders, we must strongly reject the standard model. We need to build models of financial equilibrium which are more sensitive to real life trading mechanisms, which account more realistically for the formation of expectations, and which recognize that, at any one time, there is a limited pool of investors available with the ability to evaluate stocks and take appropriate action in the market.

The standard model calculation of ϵ'/ϵ

1991 ◽  
Vol 527 ◽  
pp. 735-738
Author(s):  
Jonathan M Flynn
Keyword(s):  
Standard Model ◽  
Model Calculation ◽  
The Standard Model

scholarly journals Weak scale from Planck scale: Mass scale generation in a classically conformal two-scalar system

2020 ◽  
Vol 2020 (3) ◽  
Author(s):  
Junichi Haruna ◽  
Hikaru Kawai
Keyword(s):  
Scalar Field ◽  
Standard Model ◽  
Planck Scale ◽  
Vacuum Expectation ◽  
Vacuum Expectation Value ◽  
The Other ◽  
Expectation Value ◽  
Weak Scale ◽  
The Standard Model ◽  
The One

Abstract In the standard model, the weak scale is the only parameter with mass dimensions. This means that the standard model itself cannot explain the origin of the weak scale. On the other hand, from the results of recent accelerator experiments, except for some small corrections, the standard model has increased the possibility of being an effective theory up to the Planck scale. From these facts, it is naturally inferred that the weak scale is determined by some dynamics from the Planck scale. In order to answer this question, we rely on the multiple point criticality principle as a clue and consider the classically conformal $\mathbb{Z}_2\times \mathbb{Z}_2$ invariant two-scalar model as a minimal model in which the weak scale is generated dynamically from the Planck scale. This model contains only two real scalar fields and does not contain any fermions or gauge fields. In this model, due to a Coleman–Weinberg-like mechanism, the one-scalar field spontaneously breaks the $ \mathbb{Z}_2$ symmetry with a vacuum expectation value connected with the cutoff momentum. We investigate this using the one-loop effective potential, renormalization group and large-$N$ limit. We also investigate whether it is possible to reproduce the mass term and vacuum expectation value of the Higgs field by coupling this model with the standard model in the Higgs portal framework. In this case, the one-scalar field that does not break $\mathbb{Z}_2$ can be a candidate for dark matter and have a mass of about several TeV in appropriate parameters. On the other hand, the other scalar field breaks $\mathbb{Z}_2$ and has a mass of several tens of GeV. These results will be verifiable in near-future experiments.

clause whereby it was a condition of acceptance that goods would be charged at prices ruling at the date of delivery. The defendant buyers replied on 27 May 1969, giving an order with differences from the sellers’ quotation and with their own terms and conditions, which had no price variation clause. The order had a tear-off acknowledgment for signature and return which accepted the order ‘on the terms and conditions thereon’. On 5 June 1969, the sellers, after acknowledging receipt of the order on 4 June, returned the acknowledgment form duly completed with a covering letter stating that delivery was to be ‘in accordance with our revised quotation of 23 May for delivery in ... March/April 1970’. The machine was ready by about September 1970, but the buyers could not accept delivery until November 1970. The sellers invoked the price increase clause and claimed £2,892 for the increase due to the rise in costs between 27 May 1969 and 1 April 1970, when the machine should have been delivered. Thesiger J gave judgment for the sellers for £2,892 and interest. The buyers appealed. The Court of Appeal unanimously reversed the first instance decision, all three judges feeling that the conclusive act was the sellers’ return of the tear-off acknowledgment slip. However, the reasons given by the judges for arriving at their decision differed. Bridge LJ and Lawton LJ broadly applied the standard model of ‘offer – counter-offer – acceptance’ to this ‘battle of the forms’, although both of them were clearly aware of the difficulties that this would cause. Lord Denning’s approach, not untypically, ranged much more widely. Unlike the other two judges, who can be seen to adopt a broadly ‘last shot’ theory (that is, that the ‘battle’ is won by the person who submits their terms last), Lord Denning was prepared to countenance a number of other possibilities. The following passages serve to indicate these divergences in approach: Butler Machine Tool Co Ltd v Ex-Cell-O Corpn (England) Ltd [1979] 1 WLR 401, CA, p 402

1995 ◽  
pp. 118-124
Keyword(s):  
Standard Model ◽  
Machine Tool ◽  
Price Increase ◽  
The Other ◽  
Price Variation ◽  
Covering Letter ◽  
The Standard Model ◽  
Court Of Appeal

scholarly journals The force and gravity of events

2016 ◽  
Vol 31 (16) ◽  
pp. 1630015 ◽  
Author(s):  
Robert Delbourgo
Keyword(s):  
Standard Model ◽  
Cosmological Constant ◽  
Ricci Scalar ◽  
The Other ◽  
Gauge Fields ◽  
Generalized Metric ◽  
The Standard Model ◽  
Property Space

Local events are characterized by “where”, “when” and “what”. Just as (bosonic) spacetime forms the backdrop for location and time, (fermionic) property space can serve as the backdrop for the attributes of a system. With such a scenario I shall describe a scheme that is capable of unifying gravitation and the other forces of nature. The generalized metric contains the curvature of spacetime and property separately, with the gauge fields linking the bosonic and fermionic arenas. The super-Ricci scalar can then automatically yield the spacetime Lagrangian of gravitation and the Standard Model (plus a cosmological constant) upon integration over property coordinates.

LIMITS ON NON-NEWTONIAN GRAVITY AND HYPOTHETICAL FORCES FROM MEASUREMENTS OF THE CASIMIR FORCE

2005 ◽  
Vol 20 (11) ◽  
pp. 2222-2231 ◽  
Author(s):  
F. CHEN ◽  
U. MOHIDEEN ◽  
P. W. MILONNI
Keyword(s):  
Standard Model ◽  
Extra Dimensions ◽  
Casimir Force ◽  
Gravitational Force ◽  
The Other ◽  
Newtonian Gravity ◽  
The Standard Model ◽  
Fundamental Forces ◽  
Two Bodies ◽  
New Particles

Modern unification theories that seek to unify gravity with the other fundamental forces predict a host of new particles outside the standard model. Many also invoke extra dimensions. Both of these effects lead to deviations from Newtonian gravity. For sub micron distance between two bodies, the Casimir force far exceeds the gravitational force. Thus both understanding and using the Casimir force is very important for checking the relevance of these unification theories. In particular, measurements of the Casimir force has allowed one to set some of the strongest constraints for corresponding distance regions. This paper summarizes the techniques used to measure the Casimir force and some of the limits that follow from them.

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