TITLE

Discovery of proton decay: A must for theory, a challenge for experiment

AUTHOR(S)
Pati, Jogesh C.
PUB. DATE
August 2000
SOURCE
AIP Conference Proceedings;2000, Vol. 533 Issue 1, p37
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
It is noted that, but for one missing piece - proton decay - the evidence in support of grand unification is now strong. It includes: (i) the observed family-structure, (ii) the meeting of the gauge couplings, (iii) neutrino-oscillations, (iv) the intricate pattern of the masses and mixings of all fermions, including the neutrinos, and (v) the need for B - L as a generator, to implement baryogenesis. Taken together, these not only favor grand unification but in fact select out a particular route to such unification, based on the ideas of supersymmetry, SU(4)-color and left-right symmetry. Thus they point to the relevance of an effective string-unified G(224) or SO(10)-symmetry. A concrete proposal is presented, within a predictive SO(10)/G(224)-framework, that successfully describes the masses and mixings of all fermions, including the neutrinos - with eight predictions, all in agreement with observation. Within this framework, a systematic study of proton decay is carried out, which pays special attention to its dependence on the fermion masses, including the superheavy Majorana masses of the right-handed neutrinos. The study shows that a conservative upper limit on the proton lifetime is about (1/2 − 1) × 10[sup 34] yrs, with &vmacr;K[sup +] being the dominant decay mode, and as a distinctive feature, μ[sup+]K[sup 0] being prominent. This in turn strongly suggests that an improvement in the current sensitivity by a factor of five to ten (compared to SuperK) ought to reveal proton decay. Otherwise some promising and remarkably successful ideas on unification would suffer a major setback.
ACCESSION #
5664614

 

Related Articles

  • δT/T, Neutrino Oscillations And Proton Decay. Shafi, Qaisar // AIP Conference Proceedings;2005, Vol. 805 Issue 1, p10 

    A gauged U(1)B-L symmetry predicts three right handed handed neutrinos and its spontaneous breaking automatically yields the seesaw mechanism. In a supersymmetric setting this breaking can be nicely linked with inflation to yield δT/T proportional to (MB-L/MP)2, where MB-L (MP) denote the B -...

  • Nucleon instability and (B-L) non-conservation. Kamyshkov, Yu. // AIP Conference Proceedings;2000, Vol. 533 Issue 1, p84 

    Proton decay with the modes and rates predicted by the original SU(5) grand unification scheme conserving (B-L) is not observed experimentally. There are reasons to expect that (B-L) might not be conserved in nature. Among possible observable manifestations of (B-L) non-conservation are Majorana...

  • Proton decay and lepton flavor violation in SUSY SO(10) GUT. Mimura, Yukihiro // AIP Conference Proceedings;7/25/2012, Vol. 1467 Issue 1, p109 

    Diverse mass and mixing patterns between the quarks and leptons makes it challenging to construct a simple grand unified theory of flavor. The SO(10) SUSY GUT with type II seesaw mechanism giving neutrino masses provide a natural framework for addressing this issue. Proton decay suppression is...

  • Relation of the neutrino mixing parameters and proton decay suppression in SUSY SO(10)GUT. Mimura, Yukihiro // AIP Conference Proceedings;May2013, Vol. 1534 Issue 1, p302 

    The neutrino mixing parameters are being measured accurately. In a framework of grand unified theory, the neutrino mixing parameters can be discussed in unified Yukawa structure of quark and lepton sectors. The Yukawa structure is also important to suppress proton decays. We discuss that the...

  • Witten's loop in the flipped SU(5) unification. Malinský, Michal; Rodríguez, Carolina Arbeláez; Kolešová, Helena // AIP Conference Proceedings;2014, Vol. 1604, p237 

    We study a very simple, yet potentially realistic renormalizable flipped SU(5) scenario in which the right-handed neutrino masses are generated at very high energies by means of a two-loop diagram similar to that identified by E. Witten in the early 1980's in the SO(10) GUT framework. This...

  • Rock solid. Matthews, Robert // New Scientist;05/22/99, Vol. 162 Issue 2187, p48 

    Discusses the major difficulty facing all grand unified theories (GUTs) of nature, concerning the stability of the proton. No evidence for proton decay; Lifespan of a proton, as found by symmetry group GUTs; Description of several sub-atomic particles and processes, including quarks and...

  • From neutrino masses to proton decay. Ramond, P. // AIP Conference Proceedings;2000, Vol. 533 Issue 1, p54 

    Current theoretical and experimental issues are reviewed in the light of the recent SuperKamiokande discovery. By using quark-lepton symmetries, derived from Grand Unification and/or string theories, we show how to determine the necessary neutrino parameters. In addition, the seesaw neutrino...

  • Fermion mass relations in a supersymmetric SO(10) theory. Bajc, Borut; Melfo, Alejandra; Senjanovic, Goran; Vissani, Francesco // AIP Conference Proceedings;2005, Vol. 805 Issue 1, p152 

    Neutrino and charged fermion masses provide important constraints on supersymmetric grand unified theories. We illustrate this by focusing on a renormalizable, supersymmetric SO(10) theory proposed long ago, that recently attracted great interest in view of its minimality. We show how the nature...

  • Decay Rates for Spherical and Deformed Proton Emitters. Davids, Cary N.; Esbensen, Henning // AIP Conference Proceedings;2000, Vol. 518 Issue 1, p200 

    Using Green‘s function techniques, we derive expressions for the width of a proton decaying state in spherical and deformed nuclei. We show that the proton decay widths calculated by the “exact” expressions of Maglione et al. are equivalent to the distorted wave expressions of...

Share

Read the Article

Courtesy of VIRGINIA BEACH PUBLIC LIBRARY AND SYSTEM

Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics