Статті в журналах з теми "Unified theories of flavour"

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1

Lim, C. S., and Bungo Taga. "Lepton-Flavour Violation in Ordinary and Supersymmetric Grand Unified Theories." Journal of the Physical Society of Japan 69, no. 2 (February 15, 2000): 369–72. http://dx.doi.org/10.1143/jpsj.69.369.

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2

Barbieri, Riccardo, Lawrence Hall, and Alessandro Strumia. "Violations of lepton flavour and CP in supersymmetric unified theories." Nuclear Physics B 445, no. 2-3 (July 1995): 219–51. http://dx.doi.org/10.1016/0550-3213(95)00208-a.

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3

Hagedorn, C. "Flavor Symmetries and Grand Unified Theories." Nuclear Physics B - Proceedings Supplements 217, no. 1 (August 2011): 334–36. http://dx.doi.org/10.1016/j.nuclphysbps.2011.04.131.

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4

Masiero, A., and P. Paradisi. "Flavor Physics in SUSY Grand Unified Theories." Nuclear Physics B - Proceedings Supplements 168 (June 2007): 328–33. http://dx.doi.org/10.1016/j.nuclphysbps.2007.02.032.

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5

Barbieri, Riccardo, Lawrence J. Hall, Stuart Raby, and Andrea Romanino. "Unified theories with U(2) flavor symmetry." Nuclear Physics B 493, no. 1-2 (May 1997): 3–26. http://dx.doi.org/10.1016/s0550-3213(97)00134-x.

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6

Nevzorov, R. "E6 inspired SUSY models with custodial symmetry." International Journal of Modern Physics A 33, no. 31 (November 10, 2018): 1844007. http://dx.doi.org/10.1142/s0217751x18440074.

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Анотація:
The breakdown of [Formula: see text] within the supersymmetric (SUSY) Grand Unified Theories (GUTs) can result in SUSY extensions of the standard model (SM) based on the SM gauge group together with extra [Formula: see text] gauge symmetry under which right-handed neutrinos have zero charge. In these [Formula: see text] extensions of the minimal supersymmetric standard model (MSSM) a single discrete [Formula: see text] symmetry may be used to suppress the most dangerous operators, that give rise to proton decay as well as nondiagonal flavour transitions at low energies. The SUSY models under consideration involves [Formula: see text] and extra exotic matter beyond the MSSM. We discuss leptogenesis within this SUSY model and argue that the extra exotic states may lead to the nonstandard Higgs decays.
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7

PILAFTSIS, A. "HEAVY-NEUTRINO EFFECTS ON τ-LEPTON DECAYS". Modern Physics Letters A 09, № 38 (14 грудня 1994): 3595–604. http://dx.doi.org/10.1142/s0217732394003439.

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Анотація:
Minimal extensions of the standard model that are motivated by grand unified theories or superstring models with an E6 symmetry can naturally predict heavy neutrinos of Dirac or Majorana nature. Such heavy neutral leptons violate the decoupling theorem at the one-loop electroweak order and hence offer a unique chance for possible lepton-flavor decays of the τ-lepton, e.g. τ→eee or τ→μμμ, to be seen in LEP experiments. We analyze such decays in models with three and four generations.
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8

MASINA, ISABELLA. "THE PROBLEM OF NEUTRINO MASSES IN EXTENSIONS OF THE STANDARD MODEL." International Journal of Modern Physics A 16, no. 32 (December 30, 2001): 5101–99. http://dx.doi.org/10.1142/s0217751x01005456.

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We review the problem of neutrino masses and mixings in the context of grand unified theories. After a brief summary of the present experimental status of neutrino physics, we describe how the see-saw mechanism can automatically account for the large atmospheric mixing angle. We provide two specific examples where this possibility is realized by means of a flavor symmetry. We then review in some detail the various severe problems which plague minimal GUT models (like the doublet–triplet splitting and proton-decay) and which force us to investigate the possibility of constructing more elaborate but realistic models. We then show an example of a quasirealistic SUSY SU(5) model which, by exploiting the crucial presence of an Abelian flavor symmetry, does not require any fine-tuning and predicts a satisfactory phenomenology with respect to coupling unification, fermion masses and mixings and bounds from proton decay.
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9

PICARIELLO, MARCO. "NEUTRINO CP VIOLATING PARAMETERS FROM NONTRIVIAL QUARK–LEPTON CORRELATION: A S3 × GUT MODEL." International Journal of Modern Physics A 23, no. 27n28 (November 10, 2008): 4435–48. http://dx.doi.org/10.1142/s0217751x08041517.

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We investigate the prediction on the lepton phases in theories with a nontrivial correlation between quark (CKM) and lepton (PMNS) mixing matrices. We show that the actual evidence, under the only assumption that the correlation matrix VM product of CKM and PMNS has a zero in the entry (1, 3), gives us a prediction for the three CP-violating invariants J, S1 and S2. A better determination of the lepton mixing angles will give stronger prediction for the CP-violating invariants in the lepton sector. These will be tested in the next generation experiments. To clarify how our prediction works, we show how a model based on a Grand Unified Theory and the permutation flavor symmetry S3 predicts [Formula: see text].
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10

MOHAPATRA, R. N. "NEUTRINO MASS AND GRAND UNIFICATION OF FLAVOR." International Journal of Modern Physics A 25, no. 23 (September 20, 2010): 4311–23. http://dx.doi.org/10.1142/s0217751x10050688.

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Анотація:
The problem of understanding quark mass and mixing hierarchies has been an outstanding problem of particle physics for a long time. The discovery of neutrino masses in the past decade, exhibiting mixing and mass patterns so very different from the quark sector has added an extra dimension to this puzzle. This is specially difficult to understand within the framework of conventional grand unified theories which are supposed to unify the quarks and leptons at short distance scales. In the paper, I discuss a recent proposal by Dutta, Mimura and this author that appears to provide a promising way to resolve this puzzle. After stating the ansatz, we show how it can be realized within a SO(10) grand unification framework. Just as Gell-Mann's suggestion of SU(3) symmetry as a way to understand the hadronic flavor puzzle of the sixties led to the foundation of modern particle physics, one could hope that a satisfactory resolution of the current quark-lepton flavor problem would provide fundamental insight into the nature of physics beyond the standard model.
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11

Chester, David, Alessio Marrani, and Michael Rios. "Beyond the Standard Model with Six-Dimensional Spinors." Particles 6, no. 1 (January 28, 2023): 144–72. http://dx.doi.org/10.3390/particles6010008.

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Анотація:
Six-dimensional spinors with Spin(3,3) symmetry are utilized to efficiently encode three generations of matter. E8(−24) is shown to contain physically relevant subgroups with representations for GUT groups, spacetime symmetries, three generations of the standard model fermions, and Higgs bosons. Pati–Salam, SU(5), and Spin(10) grand unified theories are found when a single generation is isolated. For spacetime symmetries, Spin(4,2) may be used for conformal symmetry, AdS5→dS4, or simply broken to Spin(3,1) of a Minkowski space. Another class of representations finds Spin(2,2) and can give AdS3 with various GUTs. An action for three generations of fermions in the Majorana–Weyl spinor 128 of Spin(4,12) is found with Spin(3) flavor symmetry inside E8(−24). The 128 of Spin(12,4) can be regarded as the tangent space to a particular pseudo-Riemannian form of the octo-octonionic Rosenfeld projective plane E8(−24)/Spin(12,4)=(OsxO)P2.
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12

King, Stephen F., Stefano Moretti, and Roman Nevzorov. "A Review of the Exceptional Supersymmetric Standard Model." Symmetry 12, no. 4 (April 4, 2020): 557. http://dx.doi.org/10.3390/sym12040557.

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Анотація:
Local supersymmetry (SUSY) provides an attractive framework for the incorporation of gravity and unification of gauge interactions within Grand Unified Theories (GUTs). Its breakdown can lead to a variety of models with softly broken SUSY at low energies. In this review article, we focus on the SUSY extension of the Standard Model (SM) with an extra U ( 1 ) N gauge symmetry originating from a string-inspired E 6 GUTs. Only in this U ( 1 ) extension of the minimal supersymmetric standard model (MSSM) can the right-handed neutrinos be superheavy, providing a mechanism for the baryon asymmetry generation. The particle content of this exceptional supersymmetric standard model (E 6 SSM) includes three 27 representations of the E 6 group, to ensure anomaly cancellation. In addition it also contains a pair of S U ( 2 ) W doublets as required for the unification of gauge couplings. Thus, E 6 SSM involves exotic matter beyond the MSSM. We consider symmetries that permit suppressing flavor changing processes and rapid proton decay, as well as gauge coupling unification, the gauge symmetry breaking and the spectrum of Higgs bosons in this model. The possible Large Hadron Collider (LHC) signatures caused by the presence of exotic states are also discussed.
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13

King, S. F. "Unified models of neutrinos, flavour andCPViolation." Progress in Particle and Nuclear Physics 94 (May 2017): 217–56. http://dx.doi.org/10.1016/j.ppnp.2017.01.003.

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14

Romão, J. C., A. Barroso, M. C. Bento, and G. C. Branco. "Flavour violation in supersymmetric theories." Nuclear Physics B 250, no. 1-4 (January 1985): 295–311. http://dx.doi.org/10.1016/0550-3213(85)90483-3.

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15

Tseitlin, A. A. "Unified string theories." Uspekhi Fizicheskih Nauk 153, no. 11 (1987): 531. http://dx.doi.org/10.3367/ufnr.0153.198711j.0531.

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16

Mondragón, M., and G. Zoupanos. "Finite unified theories." Journal of Physics: Conference Series 171 (June 1, 2009): 012095. http://dx.doi.org/10.1088/1742-6596/171/1/012095.

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17

Tseĭtlin, A. A. "Unified string theories." Soviet Physics Uspekhi 30, no. 11 (November 30, 1987): 1012–13. http://dx.doi.org/10.1070/pu1987v030n11abeh002985.

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18

Kelly, Daniel P. "Ageing theories unified." Nature 470, no. 7334 (February 2011): 342–43. http://dx.doi.org/10.1038/nature09896.

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19

Taylor, J. C. "Grand unified theories." Contemporary Physics 27, no. 4 (July 1986): 363–65. http://dx.doi.org/10.1080/00107518608211019.

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20

Kosmas, T., G. K. Leontaris, and J. D. Vergados. "Lepton flavour violation in supergravity theories." Physics Letters B 219, no. 4 (March 1989): 457–63. http://dx.doi.org/10.1016/0370-2693(89)91094-0.

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21

Gómez-Izquierdo, J. C., F. González Canales, and M. Mondragón. "A Grand Unified model withQ6as the flavour symmetry." Journal of Physics: Conference Series 485 (March 24, 2014): 012057. http://dx.doi.org/10.1088/1742-6596/485/1/012057.

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22

King, Stephen F., and Christoph Luhn. "A supersymmetric grand unified theory of flavour with." Nuclear Physics B 832, no. 1-2 (June 2010): 414–39. http://dx.doi.org/10.1016/j.nuclphysb.2010.02.019.

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23

Vinkhuyzen, R. Erik, Paul F. M. J. Verschure, and Allen Newell. "Unified Theories of Cognition." American Journal of Psychology 107, no. 3 (1994): 454. http://dx.doi.org/10.2307/1422886.

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24

Granger, Richard. "Unified Theories of Cognition." Journal of Cognitive Neuroscience 3, no. 3 (July 1991): 301–2. http://dx.doi.org/10.1162/jocn.1991.3.3.301.

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25

KOBAYASHI, T., J. KUBO, M. MONDRAGÓN, and G. ZOUPANOS. "EXACT FINITE UNIFIED THEORIES." International Journal of Modern Physics A 16, no. 11 (April 30, 2001): 2053–57. http://dx.doi.org/10.1142/s0217751x01004694.

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Finite Unified Theories are N=1 supersymmetric GUT's that can be made finite beyond the unification point, including the softly broken sector. The new characteristic predictions of FUTs are: 1) The lightest Higgs boson mass is predicted to be in the window 120-130 GeV, in case the LSP is neutralino, while in case the LSP is the [Formula: see text] (which can be consistently accommodated in presence of bilinear R-parity violating terms) it can be as light as 111 GeV. 2) The s-spectrum starts above several hundreds of GeV.
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26

Werner, Gerhard. "Unified Theories of Cognition." Journal of Nervous and Mental Disease 180, no. 5 (May 1992): 339–40. http://dx.doi.org/10.1097/00005053-199205000-00011.

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27

Byrne, Michael D. "Unified theories of cognition." Wiley Interdisciplinary Reviews: Cognitive Science 3, no. 4 (May 16, 2012): 431–38. http://dx.doi.org/10.1002/wcs.1180.

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28

Arbib, Michael A. "Unified Theories of Cognition." Artificial Intelligence 59, no. 1-2 (February 1993): 265–83. http://dx.doi.org/10.1016/0004-3702(93)90195-h.

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29

Dennett, Daniel C. "Unified Theories of Cognition." Artificial Intelligence 59, no. 1-2 (February 1993): 285–94. http://dx.doi.org/10.1016/0004-3702(93)90196-i.

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30

Minsky, Marvin. "Unified theories of cognition." Artificial Intelligence 59, no. 1-2 (February 1993): 343–54. http://dx.doi.org/10.1016/0004-3702(93)90199-l.

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31

Abel, S., G. C. Branco, and S. Khalil. "CP violation versus flavour in supersymmetric theories." Physics Letters B 569, no. 1-2 (September 2003): 14–24. http://dx.doi.org/10.1016/j.physletb.2003.07.012.

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32

Bari, Pasquale Di, and Stephen F. King. "SuccessfulN2leptogenesis with flavour coupling effects in realistic unified models." Journal of Cosmology and Astroparticle Physics 2015, no. 10 (October 2, 2015): 008. http://dx.doi.org/10.1088/1475-7516/2015/10/008.

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33

Jeannerot, R. "Inflation in supersymmetric unified theories." Physical Review D 56, no. 10 (November 15, 1997): 6205–16. http://dx.doi.org/10.1103/physrevd.56.6205.

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34

Zoupanos, G. "New challenges in unified theories." Physics of Particles and Nuclei 43, no. 5 (September 2012): 611–15. http://dx.doi.org/10.1134/s1063779612050401.

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35

Geiger, Gebhard. "Intertheory relations from unified theories." Journal for General Philosophy of Science 22, no. 2 (September 1991): 263–82. http://dx.doi.org/10.1007/bf01801210.

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36

Parker, Leonard, and David J. Toms. "Gravity and grand unified theories." General Relativity and Gravitation 17, no. 2 (February 1985): 167–71. http://dx.doi.org/10.1007/bf00760528.

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37

Grech, Dariusz K. "Construction of grand unified theories." Annals of Physics 205, no. 2 (February 1991): 309–29. http://dx.doi.org/10.1016/0003-4916(91)90018-4.

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38

Ovrut, Burt A. "Supergravity and grand unified theories." Physica D: Nonlinear Phenomena 15, no. 1-2 (February 1985): 221–29. http://dx.doi.org/10.1016/0167-2789(85)90166-6.

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39

Morrison, Margaret. "Unified Theories and Disparate Things." PSA: Proceedings of the Biennial Meeting of the Philosophy of Science Association 1994, no. 2 (January 1994): 365–73. http://dx.doi.org/10.1086/psaprocbienmeetp.1994.2.192947.

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40

Marco Pruna, Giovanni. "Effective-field theories for charged lepton flavour violation." EPJ Web of Conferences 179 (2018): 01019. http://dx.doi.org/10.1051/epjconf/201817901019.

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These proceedings review the status of present and future bounds on muonic lepton flavour violating transitions in the context of an effective-field theory defined below the electroweak scale. A specific focus is set on the phenomenology of μ → eγ, μ → 3e transitions and coherent μ → e nuclear conversion in the light of current and future experiments. Once the experimental limits are recast into bounds at higher scales, it is shown that the interplay between the various experiments is crucial to cover all corners of the parameter space.
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41

Leontaris, G. K., N. D. Tracas, and J. D. Vergados. "Renormalization effects on flavour mixing in supergravity theories." Physics Letters B 206, no. 2 (May 1988): 247–51. http://dx.doi.org/10.1016/0370-2693(88)91500-6.

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42

Dimopoulos, Savas, and Alex Pomarol. "Non-unified sparticle and particle masses in unified theories." Physics Letters B 353, no. 2-3 (June 1995): 222–27. http://dx.doi.org/10.1016/0370-2693(95)00570-b.

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43

KHALIL, SHAABAN. "CP VIOLATION IN SUPERSYMMETRIC THEORIES." International Journal of Modern Physics A 18, no. 10 (April 20, 2003): 1697–732. http://dx.doi.org/10.1142/s0217751x03013570.

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We review the present status of the CP violating problem in supersymmetric extensions of the standard model. We analyze the constraints imposed by the experimental limits of the electron, neutron, and mercury electric dipole moments on the supersymmetric CP phases and show that only the scenarios with flavour-off-diagonal CP violation remain attractive. These scenarios require Hermitian Yukawa matrices which naturally arise in models with left–right symmetry or a SU(3) flavour symmetry. In this case, εK and ε′/ε can be saturated by a small non-universality of the soft scalar masses through the gluino and chargino contributions respectively. The model also predicts a strong correlation between A CP (b → sγ) and the neutron electric dipole moment. In this framework, the standard model gives a the leading contribution to the CP asymmetry in B → ψKS decay, while the dominant chargino contribution to this asymmetry is < 0.2. Thus, no constraint is set on the non-universality of this model by the recent BaBar and Belle measurements.
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44

Townsend, James T. "Unified theories and theories that mimic each other's predictions." Behavioral and Brain Sciences 15, no. 3 (September 1992): 458–59. http://dx.doi.org/10.1017/s0140525x00069685.

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45

Heinemeyer, S., M. Mondragón, and G. Zoupanos. "Phenomenology ofSU(5) finite unified theories." Journal of Physics: Conference Series 171 (June 1, 2009): 012096. http://dx.doi.org/10.1088/1742-6596/171/1/012096.

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46

Baez, John, and John Huerta. "The algebra of grand unified theories." Bulletin of the American Mathematical Society 47, no. 3 (March 11, 2010): 483–552. http://dx.doi.org/10.1090/s0273-0979-10-01294-2.

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47

Gibbons, G. W. "Rotating Black Holes in Unified Theories." Progress of Theoretical Physics Supplement 136 (1999): 18–28. http://dx.doi.org/10.1143/ptps.136.18.

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48

Li, Tianjun. "Grand unified theories and proton decay." Chinese Science Bulletin 63, no. 24 (August 1, 2018): 2474–83. http://dx.doi.org/10.1360/n972018-00002.

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49

Collins, P. D. B. "Grand Unified Theories: Frontiers in Physics." Physics Bulletin 37, no. 10 (October 1986): 429. http://dx.doi.org/10.1088/0031-9112/37/10/029.

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50

Nath, Pran, A. H. Chamseddine, and R. Arnowitt. "Nucleon decay in supergravity unified theories." Physical Review D 32, no. 9 (November 1, 1985): 2348–58. http://dx.doi.org/10.1103/physrevd.32.2348.

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