Breaking ofB−Lin superstring inspiredE6model

Kartavtsev, Alexander

doi:10.1088/0954-3899/31/11/006

Cited by 3 publications

(2 citation statements)

References 22 publications

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“…The smallest extension of the MSSM capable of incorporating all of the phenomena mentioned in Section I is motivated by E 6 GUT symmetries. Systems based on the E 6 gauge group (or its various subgroups), with matter states arising from the fundamental 27 representation, have been in the past -and continue to be nowan appealing framework for organizing models of beyond the MSSM physics [39,40,41,42,43,44,45,46,47]. From within this framework many interesting limits and sub-models can be studied: quasi-stable exotics, exotics which mix with SM fermions, promptly decaying leptoquarks, promptly decaying diquarks, and so forth.…”

Section: Outline Of Casesmentioning

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: Outline Of Casesmentioning

confidence: 99%

Theory and phenomenology of exotic isosinglet quarks and squarks

2008

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“…The pHe + energy levels have been calculated by three-body QED calculations to relative precision of 1 part in 10 9 [17]. This involved first solving [206,207,208,209,210,211,212,213,214,215,216,217,218,219] the non-relativistic Hamiltonian expressed in natural units of m e = h = e = 1,…”

Section: Theoretical Calculationsmentioning

confidence: 99%

Physics at CERN’s Antiproton Decelerator

Hori

Walz

2013

Progress in Particle and Nuclear Physics

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The Antiproton Decelerator (AD) facility of CERN began operation in 1999 to serve experiments for studies of CP T invariance by precision laser and microwave spectroscopy of antihydrogen (H) and antiprotonic helium (pHe + ) atoms. The first 12 years of AD operation saw cold H synthesized by overlapping clouds of positrons (e + ) and antiprotons (p) confined in magnetic Penning traps. Cold H was also produced in collisions between Rydberg positronium (P s) atoms and p. Ground-state H was later trapped for up to ∼ 1000 s in a magnetic bottle trap, and microwave transitions excited between its hyperfine levels. In the pHe + atom, deep ultraviolet transitions were measured to a fractional precision of (2.3-5) × 10 −9 by sub-Doppler two-photon laser spectroscopy. From this the antiproton-to-electron mass ratio was determined as M p /m e =1836.1526736(23), which agrees with the p value known to a similar precision. Microwave spectroscopy of pHe + yielded a measurement of the p magnetic moment with a precision of 0.3%. More recently, the magnetic moment of a single p confined in a Penning trap was measured with a higher precision, as µ p = −2.792845(12)µ nucl in nuclear magnetons. Other results reviewed here include the first measurements of the energy loss (−dE/dx) of 1-100 keV p traversing conductor and insulator targets; the cross sections of low-energy (< 10 keV) p ionizing atomic and molecular gas targets; and the cross sections of 5-MeV p annihilating on various target foils via nuclear collisions. The biological effectiveness of p beams destroying cancer cells was measured as a possible method for radiological therapy. New experiments under preparation attempt to measure the gravitational acceleration of H or synthesize H + . Several other future experiments will also be briefly described.

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Baryon and lepton numbers in two scenarios of leptogenesis

Kartavtsev¹

2006

Phys. Scr.

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Baryon and lepton numbers of the Universe in leptogenesis with Dirac neutrino and leptogenesis with Majorana neutrino scenarios are considered. It is shown that despite quite different features of Dirac and Majorana fermions both scenarios yield the same relation among the initial lepton and the final baryon asymmetries. Moreover right-handed neutrinos in the leptogenesis with Dirac neutrino scenario have very little impact on the effective number of relativistic degrees of freedom, constrained by BBN. Thus the two scenarios are similar from the cosmological point of view. It is also pointed out that in thermal equilibrium the 3B + L sum is zero for left-handed fermions.

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Breaking ofB−Lin superstring inspiredE₆model

Cited by 3 publications

References 22 publications

Theory and phenomenology of exotic isosinglet quarks and squarks

Theory and phenomenology of exotic isosinglet quarks and squarks

Physics at CERN’s Antiproton Decelerator

Baryon and lepton numbers in two scenarios of leptogenesis

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