Extra fermions in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">E</mml:mi></mml:mrow><mml:mrow><mml:mn>6</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>superstring theories

Barger, V.; Deshpande, N. G.; Phillips, R. J.; Whisnant, K.

doi:10.1103/physrevd.33.1912

Cited by 116 publications

(44 citation statements)

References 26 publications

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“…The case of mixing between exotics and SM quarks (through arbitrary mechanisms) and its phenomenology has been well-covered in the literature [53,54,55,56], especially in the non-supersymmetric case. We will therefore focus on cases where such a sneutrino vev or other mechanism is absent for the rest of this work.…”

Section: B Charge Assignmentsmentioning

confidence: 99%

Theory and phenomenology of exotic isosinglet quarks and squarks

2008

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Extensions of the MSSM often predict the existence of new fermions and their scalar superpartners which are vectorlike with respect to the standard model gauge group but may be chiral under additional gauge factors. In this paper we explore the production and decay of an important example, i.e., a heavy isosinglet charge −1/3 quark and its scalar partner, using the charge assignments of a 27-plet of E6 for illustration. We emphasize that, depending on the symmetries of the low energy theory, such exotic particles may decay by the mixing of the fermion with the d, s, or b quarks; may decay by leptoquark or diquark couplings (which may nevertheless preserve a form of R-parity); or may be stable with respect to renormalizable couplings but decay by higher-dimension operators on cosmological times scales. We discuss the latter two possibilities in detail for various assumptions concerning the relative masses of the exotic fermions, scalars, and the lightest neutralino, and emphasize the necessity of considering the collider signatures in conjunction with the normal MSSM processes. Existing and projected constraints from colliders, indirect experiments, proton decay, and big bang nucleosynthesis are considered.

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Section: B Charge Assignmentsmentioning

confidence: 99%

Theory and phenomenology of exotic isosinglet quarks and squarks

2008

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“…In accordance with the literature [3,10,12], we denote this exotic quark as h; one should not confuse the exotic h quark with the SM Higgs boson, denoted H 0 . We assume h is the dominant exotic quark (relative to the two other exotic quarks) which mixes with the downtype SM quarks.…”

Section: The Model a Matter States Expected In Ementioning

confidence: 99%

“…For additional information on constraints of the CKM and FCNC matrix elements in an ISVLQ model, we refer the reader to studies discussed in Refs. [10,12,14,17,21,22]. In Ref.…”

Section: Constraints and The Parametrization Of The Ckm Matrix Amentioning

confidence: 99%

“…Pair production of ISVLQs at high-energy hadron colliders is expected to be dominated by quantum chromodynamics (QCD) and thus to be precisely calculable. The decays of these particles depend on their mixing with SM down-type quarks [9,10,11,12,13,14,15,16]. We analyze the prospects for producing and detecting these exotic quarks at the Fermilab Tevatron and the CERN Large Hadron Collider (LHC).…”

Section: Introductionmentioning

confidence: 99%

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ExoticQ=−1/3quark signatures at high-energy hadron colliders

André

Rosner

2004

Phys. Rev. D

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“…But we have postponed such models for our future investigations. Amongst a lot of articles devoted to the SU(5), SO(10) and E 6 unifications (see, for example, monographs [29][30][31], reviews [32][33][34][35][36], articles [37][38][39][40], also [41][42][43][44] and references therein) we have chosen only flipped models [10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25].…”

Section: Content Of the Flipped Ementioning

confidence: 99%

SEESAW SCALES AND STEPS FROM THE STANDARD MODEL TOWARDS SUPERSTRING-INSPIRED FLIPPED E₆

Das

Лаперашвили

2009

Int. J. Mod. Phys. A

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In the present paper we have investigated a number of available paths from the Standard Model (SM) to the Planck scale unification, considering a chain of flipped models following the seesaw scale extension of the SM:We have presented five cases including nonsupersymmetric and supersymmetric extensions of the SM and different contents of Higgs bosons providing the breaking of the flipped SO(10) and SU (5) down to the SM. It was shown that the final unification E 6 × U (1) or E 6 at the (Planck) GUT scale M SSG depends on the number of Higgs boson representations considered in theory. Only Higgses belonging to the vector and adjoint representations of SU (5) and SO(10) lead to the asymptotically free behaviour of nonabelian gauge coupling constants at large energies µ > ∼ 10 17 GeV. Asymptotically free models give the final unification E 6 × U (1) with the inversed E 6 fine structure constant α IntroductionNature is described by gauge theories and prefers to have the gauge groups with small rank, in comparison with the number N f of given fermion fields. For instance, the Standard Model (SM) contains 45 known fermion fields and could be described by the enormous global group SU(45) × U(1). Why does Nature choose only small subgroups of this enormous global group? The answer was given in Refs. [1][2][3][4]. The principles are simple: the resulting theory has to be (i) free from anomalies and (ii) free from bare masses. The largest simple subgroups of SU(N f ) × U(1) satisfying conditions (i) and (ii) are listed for a given N f in the Table 1 of Ref. [2] with N f going up to N f = 81. Examples taken from this Table show that we have SU(5) for N f = 15 and N f = 45, SO(10) for N f = 16 and N f = 48, E 6 for N f = 27, etc. If there exists one right-handed neutrino per family, in addition to the known SM fermions, then with one, two or three families we have the number of fermions 16, 32, 48, respectively.The insistence on the simple group is quite necessary. Otherwise, the largest semisimple groups also are possible:for N f = 78, etc., leading to the Family replicated gauge group models. The last 10 years Grand Unified Theories (GUTs) are inspired by superstring theories [5][6][7][8][9] showing a connection between superstrings and low energy particle physics phenomenology. The most realistic model based on the string theory is the heterotic string-derived flipped E 6 [10,11]. Compactification theory involving D-branes provides interesting features of the flipped models. Conventional GUT models, such as SU (5) and SO(10), have been investigated in details by a lot of authors, but none of them are not completely satisfactory. In Refs.[10] the gauge group SU(5) × U(1) ("flipped SU(5)") was suggested as a very economical candidate for unified theory: it may require only 10 + 10 Higgs representations to break the GUT symmetry, in contrast to other unified models which require large representations. There are many attractive experimentally testable results for flipped SU(5), including the prediction of α s (M Z )...

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Extra fermions inE6superstring theories

Cited by 116 publications

References 26 publications

Theory and phenomenology of exotic isosinglet quarks and squarks

Theory and phenomenology of exotic isosinglet quarks and squarks

ExoticQ=−1/3quark signatures at high-energy hadron colliders

SEESAW SCALES AND STEPS FROM THE STANDARD MODEL TOWARDS SUPERSTRING-INSPIRED FLIPPED E₆

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Extra fermions inE6superstring theories

Cited by 116 publications

References 26 publications

Theory and phenomenology of exotic isosinglet quarks and squarks

Theory and phenomenology of exotic isosinglet quarks and squarks

ExoticQ=−1/3quark signatures at high-energy hadron colliders

SEESAW SCALES AND STEPS FROM THE STANDARD MODEL TOWARDS SUPERSTRING-INSPIRED FLIPPED E6

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SEESAW SCALES AND STEPS FROM THE STANDARD MODEL TOWARDS SUPERSTRING-INSPIRED FLIPPED E₆