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Journal articles on the topic 'Supersymmetric Particles'

Author: Grafiati

Published: 7 September 2023

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1

Allanach, Ben C. "Multiple solutions in supersymmetry and the Higgs." Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 373, no. 2032 (January 13, 2015): 20140035. http://dx.doi.org/10.1098/rsta.2014.0035.

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Weak-scale supersymmetry is a well-motivated, if speculative, theory beyond the Standard Model of particle physics. It solves the thorny issue of the Higgs mass, namely: how can it be stable to quantum corrections, when they are expected to be 10 15 times bigger than its mass? The experimental signal of the theory is the production and measurement of supersymmetric particles in the Large Hadron Collider (LHC) experiments. No such particles have been seen to date, but hopes are high for the impending run in 2015. Searches for supersymmetric particles can be difficult to interpret. Here, we shall discuss the fact that, even given a well-defined model of supersymmetry breaking with few parameters, there can be multiple solutions. These multiple solutions are physically different and could potentially mean that points in parameter space have been ruled out by interpretations of LHC data when they should not have been. We shall review the multiple solutions and illustrate their existence in a universal model of supersymmetry breaking.

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CHENG, HSIN-CHIA. "CONTINUUM SUPERPARTNERS FROM SUPERSYMMETRIC UNPARTICLES." International Journal of Modern Physics A 25, no. 27n28 (November 10, 2010): 5210–21. http://dx.doi.org/10.1142/s0217751x10050974.

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In an exact conformal theory there is no particle. The excitations have continuum spectra and are called "unparticles" by Georgi. We consider supersymmetric extensions of the Standard Model with approximate conformal sectors. The conformal symmetry is softly broken in the infrared which generates a gap. However, the spectrum can still have a continuum above the gap if there is no confinement. Using the AdS/CFT correspondence this can be achieved with a soft wall in the warped extra dimension. When supersymmetry is broken the superpartners of the Standard Model particles may simply be a continuum above gap. The collider signals can be quite different from the standard supersymmetric scenarios and the experimental searches for the continuum superpartners can be very challenging.

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3

Fabiano, Nikola. "Supersymmetry." Vojnotehnicki glasnik 71, no. 2 (2023): 439–51. http://dx.doi.org/10.5937/vojtehg71-40268.

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Introduction/purpose: Supersymmetry is a symmetry of the Lagrangian that goes beyond Lie groups. It allows the exchange of bosons and fermions. The most important model is the Minimal Supersymmetric Standard Model, or MSSM. Methods: Supercharge algebra, superfields, Grassmann numbers, Berezin integral. Results: Supersymmetric transformations are global, they do not depend on spacetime coordinates. In the case of Supergravity, they are local. Conclusion: Supersymmetric models, and MSSM in particular, could describe more physics and more particles beyond the Standard Model.

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CHENG, HSIN-CHIA. "PRECISION SUPERSYMMETRY MEASUREMENTS AT THE e-e- COLLIDER." International Journal of Modern Physics A 13, no. 14 (June 10, 1998): 2329–36. http://dx.doi.org/10.1142/s0217751x98001116.

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Measurements of supersymmetric particle couplings provide important verification of supersymmetry. If some of the superpartners are at the multi-TeV scale, they will escape direct detection at planned future colliders. However, such particles induce nondecoupling corrections in processes involving the accessible superparticles through violations of the supersymmetric equivalence between gauge boson and gaugino couplings. These violations are analogous to the oblique corrections in the electroweak sector of the Standard Model, and can be parametrized in terms of super-oblique parameters. The e-e- collision mode of a future linear collider is shown to be an excellent environment for such high precision measurements of these SUSY parameters, which will provide an important probe of superparticles beyond reachable energies.

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Huong, Do Thi. "Superheavy Dark Matter in the Supersymmetric Economical 3-3-1 Model." Communications in Physics 25, no. 3 (December 31, 2015): 211. http://dx.doi.org/10.15625/0868-3166/25/3/6523.

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We suggest the supersymmetric particles contained in the supersymmetric economical 3-3-1model were produced during the heating time. They have not been thermodynamic equilibrium when it frozeout. It leads to the lightest supersymmetric particle can be a good candidate for superheavy dark matter.With assumption the lightest supersymmetric particle is Bino, we show that the correct contribution of thesuperheavy dark matter species to the present critical density requires the Bino mass is order 1012 GeVand there is not exists a large mass hierarchy of the superpartner in the considered model.

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Dobado, A., M. J. Herrero, and S. Peñaranda. "Decoupling of supersymmetric particles." European Physical Journal C 7, no. 2 (1999): 313. http://dx.doi.org/10.1007/s100520050410.

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Dobado, A., M. J. Herrero, and S. Peñaranda. "Decoupling of supersymmetric particles." European Physical Journal C 7, no. 2 (February 1999): 313–39. http://dx.doi.org/10.1007/s100529800993.

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8

Sopczak, André. "SUSY (ATLAS)." EPJ Web of Conferences 182 (2018): 02121. http://dx.doi.org/10.1051/epjconf/201818202121.

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During the LHC Run-II data-taking period, several searches for supersymmetric particles were performed by the ATLAS collaboration. The results from these searches are concisely reviewed. Model-independent and model-dependent limits on new particle production are set, and interpretations in supersymmetric models are given.

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9

FENG, JONATHAN L., ARVIND RAJARAMAN, and FUMIHIRO TAKAYAMA. "PROBING GRAVITATIONAL INTERACTIONS OF ELEMENTARY PARTICLES." International Journal of Modern Physics D 13, no. 10 (December 2004): 2355–59. http://dx.doi.org/10.1142/s0218271804006474.

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The gravitational interactions of elementary particles are suppressed by the Planck scale M*~1018 GeV and are typically expected to be far too weak to be probed by experiments. We show that, contrary to conventional wisdom, such interactions may be studied by particle physics experiments in the next few years. As an example, we consider conventional supergravity with a stable gravitino as the lightest supersymmetric particle. The next-lightest supersymmetric particle (NLSP) decays to the gravitino through gravitational interactions after about a year. This lifetime can be measured by stopping NLSPs at colliders and observing their decays. Such studies will yield a measurement of Newton's gravitational constant on unprecedentedly small scales, shed light on dark matter, and provide a window on the early universe.

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10

DATTA, AMITAVA, MONORANJAN GUCHHAIT, and BISWARUP MUKHOPADHYAYA. "NEW PARTICLE SEARCHES HAUNTED BY VIRTUAL LIGHTEST SUPERSYMMETRIC PARTICLES." Modern Physics Letters A 10, no. 13n14 (May 10, 1995): 1011–17. http://dx.doi.org/10.1142/s0217732395001113.

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Relatively light sneutrinos which are experimentally allowed but not favored theoretically, may significantly affect the currently popular search strategies for supersymmetric particles by decaying predominantly into an invisible channel. In such cases the second lightest neutralino also becomes invisible. Consequences of such scenario in connection with the ongoing searches at the Tevatron and LEP-II are discussed.

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11

CARRION, H. L., M. ROJAS, and F. TOPPAN. "OCTONIONIC REALIZATIONS OF ONE-DIMENSIONAL EXTENDED SUPERSYMMETRIES: A CLASSIFICATION." Modern Physics Letters A 18, no. 11 (April 10, 2003): 787–98. http://dx.doi.org/10.1142/s0217732303009885.

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The classification of the octonionic realizations of the one-dimensional extended supersymmetries is here furnished. These are non-associative realizations which, albeit inequivalent, are put in correspondence with a subclass of the already classified associative representations for 1D extended supersymmetries. Examples of dynamical systems invariant under octonionic realizations of the extended supersymmetries are given. We cite among the others the octonionic spinning particles, the N = 8 KdV , etc. Possible applications to supersymmetric systems arising from dimensional reduction of the octonionic superstring and M-theory are mentioned.

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12

Bellucci, S., S. Krivonos, and A. Sutulin. "supersymmetric 3-particles Calogero model." Nuclear Physics B 805, no. 1-2 (December 2008): 24–39. http://dx.doi.org/10.1016/j.nuclphysb.2008.06.024.

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13

MIYAKE, AKIKO, and AKIO SUGAMOTO. "MATRIX MODEL ON Z-ORBIFOLD." Modern Physics Letters A 17, no. 23 (July 30, 2002): 1499–512. http://dx.doi.org/10.1142/s0217732302007880.

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Six-dimensional compactification of type IIA matrix model on the Z-orbifold is studied. Introducing a Z3 symmetry properly on the three mirror images of fields in the N-body system of the supersymmetric D0 particles, the action of the matrix model compactified on the Z-orbifold is obtained. In this matrix model [Formula: see text] supersymmetry is explicitly demonstrated.

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GOSDZINSKY, P., and J. SOLÀ. "A NUMERICAL ANALYSIS OF THE FULL ONE-LOOP RENORMALIZATION OF THE WEAK GAUGE BOSON MASSES FROM SUPERSYMMETRY." Modern Physics Letters A 06, no. 21 (July 10, 1991): 1943–52. http://dx.doi.org/10.1142/s0217732391002098.

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We consider an analysis of the full one-loop radiative corrections to the weak gauge boson masses induced by the whole set of virtual supersymmetric particles entering a complete renormalization framework for electroweak interactions. Contrary to previous partial analyzes, based only on universal vacuum polarization effects, the full calculation reveals the existence of large regions of phenomenologically allowed supersymmetric parameter space where the overall gauge boson mass shifts, [Formula: see text], are negative and ranging typically between (−100, −300) MeV, even for sparticle masses of about 100 GeV. Prospects of detecting these radiative hints of supersymmetry in future collider experiments are encouraging but still tied to considerable improvement in the precision of the experiments.

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15

Lorenz, Jeanette Miriam. "Supersymmetry and the collider dark matter picture." Modern Physics Letters A 34, no. 30 (September 28, 2019): 1930005. http://dx.doi.org/10.1142/s0217732319300052.

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One of the key questions in particle physics and astrophysics is the nature of dark matter, the existence of which has been confirmed in many astrophysical and cosmological observations. Besides direct and indirect detection experiments, collider searches for dark matter offer the unique possibility to not only detect dark matter particles but in the case of discovery to also study their properties by making statements about the potential underlying theory. The search program for dark matter at the ATLAS and CMS experiments at the Large Hadron Collider is comprehensive, and includes both supersymmetric dark matter candidates and other alternatives. This review presents the latest status in these searches, with special focus on supersymmetric dark matter particles.

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16

Alvarez, Pedro D., Lucas Delage, Mauricio Valenzuela, and Jorge Zanelli. "Unconventional SUSY and Conventional Physics: A Pedagogical Review." Symmetry 13, no. 4 (April 9, 2021): 628. http://dx.doi.org/10.3390/sym13040628.

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In supersymmetric extensions of the Standard Model, the observed particles come in fermion–boson pairs necessary for the realization of supersymmetry (SUSY). In spite of the expected abundance of super-partners for all the known particles, not a single supersymmetric pair has been reported to date. Although a hypothetical SUSY breaking mechanism, operating at high energy inaccessible to current experiments cannot be ruled out, this reduces SUSY’s predictive power and it is unclear whether SUSY, in its standard form, can help reducing the remaining puzzles of the standard model (SM). Here we argue that SUSY can be realized in a different way, connecting spacetime and internal bosonic symmetries, combining bosonic gauge fields and fermionic matter particles in a single gauge field, a Lie superalgebra-valued connection. In this unconventional representation, states do not come in SUSY pairs, avoiding the doubling of particles and fields and SUSY is not a fully off-shell invariance of the action. The resulting systems are remarkably simple, closely resembling a standard quantum field theory and SUSY still emerges as a contingent symmetry that depends on the features of the vacuum/ground state. We illustrate the general construction with two examples: (i) A 2 + 1 dimensional system based on the osp(2,2|2) superalgebra, including Lorentz and u(1) generators that describe graphene; (ii) a supersymmetric extension of 3 + 1 conformal gravity with an SU(2,2|2) connection that describes a gauge theory with an emergent chiral symmetry breaking, coupled to gravity. The extensions to higher odd and even dimensions, as well as the extensions to accommodate more general internal symmetries are also outlined.

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17

Ellis, John. "Searching for supersymmetry and its avatars." Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 377, no. 2161 (November 11, 2019): 20190069. http://dx.doi.org/10.1098/rsta.2019.0069.

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Why continue looking for supersymmetry? Over and above the aesthetic and theoretical motivations from string theory, there are several longstanding pheno- menological motivations for TeV-scale super- symmetry, such as the electroweak scale, and the lightest supersymmetric particle as cold dark matter. Run 1 of the Large Hadron Collider (LHC) has actually provided three extra motivations, namely the stabilization of the electroweak vacuum, and successful predictions for the Higgs mass and couplings. How to look for it? There are several examples of emergent supersymmetry, the most recent being on the surfaces of topological insulators, and some sort of effective supersymmetry could be useful for boosting the power of laser arrays. At the LHC, attention is moving towards signatures that had previously been neglected, such as long-lived charged particles—which might be an opportunity for the MoEDAL experiment. This article is part of a discussion meeting issue ‘Topological avatars of new physics’.

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18

Fayet, Pierre. "Supersymmetric Theories of Particles and Interactions." Physica Scripta T15 (January 1, 1987): 46–60. http://dx.doi.org/10.1088/0031-8949/1987/t15/006.

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19

Stern, A. "General Action Principle for Supersymmetric Particles." Physical Review Letters 55, no. 13 (September 23, 1985): 1351–54. http://dx.doi.org/10.1103/physrevlett.55.1351.

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20

Cerutti, F. "Search for SUperSYmmetric particles at LEP2." Nuclear Physics B - Proceedings Supplements 62, no. 1-3 (March 1998): 75–85. http://dx.doi.org/10.1016/s0920-5632(97)00645-2.

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21

Wagner, Robert G. "Search for supersymmetric particles at CDF." Nuclear Physics B - Proceedings Supplements 13 (February 1990): 171–75. http://dx.doi.org/10.1016/0920-5632(90)90050-5.

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22

Picciotto, Charles E. "Supersymmetric particles from light-meson decay." Physical Review D 40, no. 11 (December 1, 1989): 3782–83. http://dx.doi.org/10.1103/physrevd.40.3782.

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23

Drees, M., and D. Zeppenfeld. "Production of supersymmetric particles in elasticepcollisions." Physical Review D 39, no. 9 (May 1, 1989): 2536–46. http://dx.doi.org/10.1103/physrevd.39.2536.

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24

BADZIAK, MARCIN. "YUKAWA UNIFICATION IN SUSY SO(10) IN LIGHT OF THE LHC HIGGS DATA." Modern Physics Letters A 27, no. 22 (July 18, 2012): 1230020. http://dx.doi.org/10.1142/s0217732312300200.

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The status of top–bottom–tau Yukawa coupling unification in supersymmetric SO(10) models is reviewed with a particular emphasis on the implications of the Higgs boson mass in the vicinity of 125 GeV, as suggested by the Large Hadron Collider (LHC) Higgs data. In addition, the recently proposed model with negative μ, D-term splitting of the soft scalar masses and nonuniversal gaugino masses generated by a nonzero F-term in a 24-dimensional representation of SU(5) ⊂ SO(10) is reanalyzed in the context of the 125 GeV Higgs. The condition of top–bottom–tau Yukawa unification together with the Higgs mass of about 125 GeV impose strong lower mass limits on supersymmetry (SUSY) particles. Nevertheless, some of the Minimal Supersymmetric Standard Model (MSSM) particles may be within the reach of LHC. In the case of models with positive μ this is the gluino. While in the case of negative μ these are the pseudoscalar Higgs, the lighter sbottom (sometimes strongly degenerate with LSP leading to sbottom coannihilations), the right-handed down squark and the gluino.

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25

Asaka, Keisuke, Alessandro D’Adda, Noboru Kawamoto, and Yoshi Kondo. "Exact lattice supersymmetry at the quantum level for N = 2 Wess–Zumino models in 1- and 2-dimensions." International Journal of Modern Physics A 31, no. 23 (August 20, 2016): 1650125. http://dx.doi.org/10.1142/s0217751x16501256.

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Supersymmetric lattice Ward–Takahashi identities are investigated perturbatively up to two-loop corrections for super doubler approach of [Formula: see text] lattice Wess–Zumino models in 1- and 2-dimensions. In this approach, notorious chiral fermion doublers are treated as physical particles and momentum conservation is modified in such a way that lattice Leibniz rule is satisfied. The two major difficulties to keep exact lattice supersymmetry are overcome. This formulation defines, however, nonlocal field theory. Nevertheless we confirm that exact supersymmetry on the lattice is realized for all supercharges at the quantum level. Delicate issues of associativity are also discussed.

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26

Ardalan, F., S. Kim, and F. Mansouri. "Can We Have Supersymmetry with Undetected Superpartners? Lessons from 2+1 Dimensions." International Journal of Modern Physics A 12, no. 06 (March 10, 1997): 1183–93. http://dx.doi.org/10.1142/s0217751x97000918.

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We show that the exact solution of the two-superbody problem in N = 2 Chern Simons supergravity in 2+1 dimensions leads to a supermultiplet of space-time. This space-time supermultiplet can be described in terms of an "operator line element" which acts on the Hilbert space of Poincaré states which make up the equivalent one-superbody source. For large distance physics, the corresponding geometry may be viewed as that of a spinning cone with an additional finite discrete dimension. One of the interesting features of this universe is that superpartners of a given particle lie in different components of this supersymmetric space-time. Therefore, to have any hope of detecting the superpartners of known particles, supersymmetry must remain exact.

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27

ARGYRES, PHILIP C., and K. NARAYAN. "STRING WEBS AND THE DECAY OF SUPERSYMMETRIC PARTICLES." International Journal of Modern Physics A 16, supp01c (September 2001): 962–66. http://dx.doi.org/10.1142/s0217751x01008618.

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The spectrum of stable electrically and magnetically charged supersymmetric particles can change discontinously due to the decay of these particles as the vacuum on the Coulomb branch is varied. We show that this decay process is well described by semiclassical field configurations even when it occurs at strong coupling. the resulting picture of the stable supersymmetric spectrum is a generalization of the "string web" picture of these states found in string constructions.

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28

ROY, ARUNAVA, and MARCO CAVAGLIÀ. "SUPERSYMMETRY VERSUS BLACK HOLES AT THE LHC." Modern Physics Letters A 23, no. 35 (November 20, 2008): 2987–96. http://dx.doi.org/10.1142/s0217732308028399.

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Supersymmetry and extra dimensions are the two most promising candidates for new physics at the TeV scale. Supersymmetric particles or extra-dimensional effects could soon be observed at the Large Hadron Collider. We propose a simple but effective method to discriminate the two models: the analysis of isolated leptons with high transverse momentum. Black hole events are simulated with the CATFISH black hole generator. Supersymmetry simulations use a combination of PYTHIA and ISAJET, the latter providing the mass spectrum. Our results show that the measure of the dilepton invariant mass provides a promising signature to differentiate supersymmetry and black hole events at the Large Hadron Collider. Analysis of event-shape variables and multilepton events complement and strengthen this conclusion.

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29

Cervelli, A. "Searches for Supersymmetry in ATLAS." International Journal of Modern Physics: Conference Series 47 (January 2018): 1860088. http://dx.doi.org/10.1142/s2010194518600881.

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After the discovery of the Higgs boson in ATLAS first run of data taking, and due to the lack of observation of new physics, searches for new particles such as Supersymmetric states are one of the main area of interest for the general purpose detectors operating at LHC. In this talk we will present a review of the searches for Supersymmetric particles, performed by the ATLAS experiment

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30

MA, ERNEST. "AXIONIC EXTENSIONS OF THE SUPERSYMMETRIC STANDARD MODEL." Modern Physics Letters A 24, no. 17 (June 7, 2009): 1335–42. http://dx.doi.org/10.1142/s0217732309030837.

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The Supersymmetric Standard Model is a benchmark theoretical framework for particle physics, yet it suffers from a number of deficiencies, the main one among which is the strong CP problem. Solving this with an axion in the context of selected new particles, it is shown in three examples that other problems go away automatically as well, resulting in (-)L and (-)3B conservation, viable combination of two dark-matter candidates, successful baryogenesis, seesaw neutrino masses, and verifiable experimental consequences at the TeV energy scale.

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31

ADHIKARI, RATHIN, and BISWARUP MUKHOPADHYAYA. "SCALAR THREE-BODY DECAYS AND SIGNALS FOR NEW PHYSICS." Modern Physics Letters A 09, no. 40 (December 28, 1994): 3741–48. http://dx.doi.org/10.1142/s0217732394003592.

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If massive invisible particles are pair-produced in a three-body decay, the energy distribution of the other (visible) product will be sensitive to the mass of the invisible pair. We discuss the implications of this fact in the contexts of a Higgs boson decaying into (i) a Z-boson and two massive neutrinos of a fourth generation, and (ii) a Z and two lightest supersymmetric particles in the minimal supersymmetric standard model.

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32

Bogachev, D., and A. Nechaev. "Search for supersymmetric particles at hadron colliders." Surveys in High Energy Physics 19, no. 3-4 (September 2004): 229–32. http://dx.doi.org/10.1080/01422410500243729.

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33

Barnett, R. Michael, and Howard E. Haber. "Detection of supersymmetric particles inW-boson decay." Physical Review D 31, no. 1 (January 1, 1985): 85–94. http://dx.doi.org/10.1103/physrevd.31.85.

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34

Fring, Andreas. "Supersymmetric integrable scattering theories with unstable particles." Journal of High Energy Physics 2005, no. 01 (January 19, 2005): 030. http://dx.doi.org/10.1088/1126-6708/2005/01/030.

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35

de Wit, Bernard. "Supersymmetric quantum mechanics, supermembranes and Dirichlet particles." Nuclear Physics B - Proceedings Supplements 56, no. 3 (July 1997): 76–87. http://dx.doi.org/10.1016/s0920-5632(97)00312-5.

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36

Takahashi, Fuminobu, and Tsutomu T. Yanagida. "Why have supersymmetric particles not been observed?" Physics Letters B 698, no. 5 (April 2011): 408–10. http://dx.doi.org/10.1016/j.physletb.2011.03.032.

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37

Acciarri, M., A. Adam, O. Adriani, M. Aguilar-Benitez, S. Ahlen, B. Alpat, J. Alcaraz, et al. "Search for supersymmetric particles at at LEP." Physics Letters B 377, no. 4 (June 1996): 289–303. http://dx.doi.org/10.1016/0370-2693(96)00368-1.

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38

Eberl, Helmut, and Vassilis C. Spanos. "GravitinoPack and decays of supersymmetric metastable particles." Computer Physics Communications 202 (May 2016): 310–25. http://dx.doi.org/10.1016/j.cpc.2015.12.027.

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39

Altarelli, G., G. Martinelli, B. Mele, and R. Rückl. "Electroproduction of supersymmetric particles and gauge bosons." Nuclear Physics B 262, no. 2 (December 1985): 204–34. http://dx.doi.org/10.1016/0550-3213(85)90284-6.

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40

Guliev, N. A., T. M. Aliev, and Kh A. Mustafaev. "$$\bar v_e e^ - $$ -Annihilation and supersymmetric particles." Soviet Physics Journal 32, no. 10 (October 1989): 817–23. http://dx.doi.org/10.1007/bf00898314.

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41

Datta, Amitava, Monoranjan Guchait, and Amitava Raychaudhuri. "Z decay constraints on supersymmetric particles revisited." Zeitschrift für Physik C Particles and Fields 54, no. 3 (September 1992): 513–17. http://dx.doi.org/10.1007/bf01559472.

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42

Steeb, Willi-Hans, and Yorick Hardy. "Supersymmetric Hamilton Operator and Entanglement." Zeitschrift für Naturforschung A 61, no. 3-4 (April 1, 2006): 139–40. http://dx.doi.org/10.1515/zna-2006-3-405.

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43

Hieu, Tran Minh. "A Model of Bulk Supersymmetry in Warped Spacetime." Communications in Physics 26, no. 2 (September 12, 2016): 111. http://dx.doi.org/10.15625/0868-3166/26/2/8461.

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The Randall-Sundrum solution to the hierarchy problem in the brane-world scenario has made a significant impact on the development of model building.We investigate in this paper a model of supersymmetry in a 5D spacetime with the Randal-Sundrum warped metric.The minimal supersymmetric extension of the standard model (MSSM) superfields propagate in the bulk between the UV and IR branes at separated orbifold fixed points, while the hidden sector in charge of supersymmetry breaking is confined on the UV brane.We derive the 4D effective action from the original 5D action of the underlying theory.The effective 4D Yukawa couplings and all the soft supersymmetry breaking terms are calculated in terms of the 5D theory's coefficients. We comment on the important role of the bulk mass parameter in the relation with the geometrical properties of particles.

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44

BAER, HOWARD, A. BARTL, DEBRA KARATAS, W. MAJEROTTO, and XERXES TATA. "SEARCHING FOR SUPERSYMMETRY AT e+e− SUPERCOLLIDERS." International Journal of Modern Physics A 04, no. 16 (October 10, 1989): 4111–63. http://dx.doi.org/10.1142/s0217751x89001709.

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We study the signals resulting from the production and subsequent decays of heavy sleptons, sneutrinos and all the charginos [Formula: see text] and neutralinos [Formula: see text] at ultrahigh energy e+e− colliders. In contrast to existing studies that assume that supersymmetric particles directly decay to the lightest supersymmetric particle (taken here to be the lightest neutralino, [Formula: see text]) which then escapes detection, we incorporate realistic decay patterns using the minimal supersymmetry model as a guide for the masses and mixing angles in the gaugino-Higgsino sector. We show that very heavy sleptons and sneutrinos often decay into heavier charginos and neutralinos which themselves often decay into real W and Z0 bosons and lighter [Formula: see text]'s and [Formula: see text]'s. This results in a considerably softer missing transverse momentum [Formula: see text] spectrum than would be expected if sparticles decayed directly to the [Formula: see text] so that [Formula: see text] is not necessarily a viable signature for very heavy sparticles. We show that the optimal signature for supersymmetry in very high energy e+e− collisions depends on the model parameters. Whereas [Formula: see text] is a viable signature for lighter sleptons and sneutrinos (m ~ 0.3 TeV ), the production of very heavy sparticles is signalled by events with two or more large angle W and Z0 bosons and often a very hard electron. We discuss strategies for extracting the SUSY signal and argue that it can be separated from standard model backgrounds over the whole of parameter space.

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DJOUADI, A. "IMPACT OF THE SUSY DECAYS ON THE SEARCH FOR THE MSSM HIGGS BOSONS AT THE LHC." Modern Physics Letters A 14, no. 05 (February 20, 1999): 359–68. http://dx.doi.org/10.1142/s0217732399000419.

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In the context of the minimal supersymmetric extension of the Standard Model, we discuss the impact of the decays of the neutral Higgs bosons into supersymmetric particles, charginos/neutralinos and sfermions. We show that these decay modes could be dominant, when they are kinematically accessible, thus strongly suppressing the branching ratios for the decay channels which are used to detect the Higgs bosons at hadron colliders. These SUSY decay modes should therefore not be overlooked in the search for the Higgs particles at the LHC.

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PIOTTO, ENRICO. "SEARCH FOR SGOLDSTINO IN e+e- COLLISIONS AT $\sqrt{S}$ FROM 189 TO 202 GEV WITH THE DELPHI EXPERIMENT." International Journal of Modern Physics A 16, supp01b (September 2001): 790–92. http://dx.doi.org/10.1142/s0217751x01008102.

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Recent theoretical studies have proposed new phenomenological scenarios where the gravitino is light and the sgoldstino can be light and so be detectable at LEP. A novelty of this framework is that the sgoldstino being a SM particle, its decay chains do not involve other supersymmetric particles, like the LSP (lightest supersymmetric particle), which could escape detection and lead to final states with missing energy. A search for sgoldstino has been performed, for the first time, in DELPHI. At LEP2 sgoldstinos are mainly produced accompanied by a photon. This process is followed by S decay into two gluons or two photons, leading to final states with three photons or two jets and one photon. Sgoldstino phenomenology, production mechanisms, the decay chains and the particle width, will be discussed. Since no evidence for this particle has been found, the limits on parameter space have been set.

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Chowdhury, Udit Narayan. "Schwinger-Type Pair Production in Non-SUSY AdS/CFT." Advances in High Energy Physics 2023 (April 29, 2023): 1–15. http://dx.doi.org/10.1155/2023/8685867.

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We study pair production of particles in the presence of an external electric field in a large N non-supersymmetric Yang-Mills theory using the holographic duality. The dual geometry we consider is asymptotically AdS and is effectively parametrized by two parameters, u 0 and − 5 / 2 < δ ≤ 0 , both of which can be related to the effective mass of quark/antiquark for non-supersymmetric theories. We numerically calculate the interquark potential profile and the effective potential to study pair production and analytically find out the threshold electric field beyond which one gets catastrophic pair creation by studying rectangular Wilson loops using the holographic method. We also find out the critical electric field from DBI analysis of a probe brane. Our initial investigations reveal that the critical electric field necessary for spontaneous pair production increases or decreases w.r.t. its non-supersymmetric value depending on the parameter δ . Ultimately, we find out the pair production rate of particles in the presence of an external electric field by evaluating circular Wilson loops using perturbative methods. From the later investigation, we note the resemblance with our earlier prediction. However, we also see that for and below another certain value of the parameter δ , the pair production rate of particle/antiparticle pairs blows up as the external electric field is taken to zero. We thus infer that the vacuum of the non-SUSY gauge theory is unstable for a range of non-supersymmetric parameter δ and that the geometry/non-SUSY field theory under consideration has quite different characteristics than earlier reported.

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CSÁKI, CSABA. "THE MINIMAL SUPERSYMMETRIC STANDARD MODEL." Modern Physics Letters A 11, no. 08 (March 14, 1996): 599–613. http://dx.doi.org/10.1142/s021773239600062x.

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The structure of the MSSM is reviewed. We first motivate the particle content of the theory by examining the quantum numbers of the known standard model particles and by the requirement of anomaly cancellation. Once the particle content is fixed we can write down the most general renormalizable superpotential. However such a superpotential will contain terms breaking lepton and baryon number which leads us to the concept of R-parity conservation. The question of supersymmetry breaking is discussed next. We list the possible soft breaking terms. However the Lagrangian involving the most general soft breaking terms is phenomenologically intractable because of the appearance of many new parameters. It also leads to some unacceptable predictions. To reduce the number of parameters we restrict ourselves to the case with universal soft breaking terms at the GUT scale. We motivate the need for universal soft breaking terms by the apparent unification of gauge couplings in the MSSM and by the absence of flavor changing neutral currents. Then we discuss radiative electroweak symmetry breaking. Radiative breaking arises because the one-loop corrections involving the large top Yukawa coupling change the sign of the soft breaking mass parameter of the up-type Higgs doublet, this way introducing a nontrivial minimum in the Higgs potential. Finally we give an overview of the possible mixings in the MSSM and enumerate the physical (mass eigenstate) fields together with the mass matrices.

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CVETIČ, MIRJAM, and PAUL LANGACKER. "NEW GAUGE BOSONS FROM STRING MODELS." Modern Physics Letters A 11, no. 15 (May 20, 1996): 1247–62. http://dx.doi.org/10.1142/s0217732396001260.

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We address the mass ranges of new neutral gauge bosons and constraints on the accompanying exotic particles as predicted by a class of superstring models. Under certain assumptions about the supersymmetry breaking parameters we show that breaking of an additional U(1)′ symmetry is radiative when the appropriate Yukawa couplings of exotic particles are of order one, analogous to the radiative breaking of the electroweak symmetry in the supersymmetric standard model due to the large top-quark Yukawa coupling. Such large Yukawa couplings occur for a large class of string models. The Z′ and exotic masses are either of [Formula: see text], or of a scale intermediate between the string and electroweak scales. In the former case, [Formula: see text] may be achieved without excessive fine-tuning, and is within future experimental reach.

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Kirschner, Roland, and George Savvidy. "Yangian and SUSY symmetry of high spin parton splitting amplitudes in generalised Yang–Mills theory." Modern Physics Letters A 32, no. 23 (July 6, 2017): 1750121. http://dx.doi.org/10.1142/s0217732317501218.

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We have calculated the high spin parton splitting amplitudes postulating the Yangian symmetry of the scattering amplitudes for tensor gluons. The resulting splitting amplitudes coincide with the earlier calculations, which were based on the BCFW recursion relations. The resulting formula unifies all known splitting probabilities found earlier in gauge field theories. It describes splitting probabilities for integer and half-integer spin particles. We also checked that the splitting probabilities fulfil the generalised Kounnas–Ross [Formula: see text] = 1 supersymmetry relations hinting to the fact that the underlying theory can be formulated in an explicit supersymmetric manner.

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