scholarly journals Search for lepton-number- and baryon-number-violating tau decays at Belle

2020 ◽  
Vol 102 (11) ◽  
Author(s):  
D. Sahoo ◽  
G. B. Mohanty ◽  
K. Trabelsi ◽  
I. Adachi ◽  
K. Adamczyk ◽  
...  
Keyword(s):  
Baryon Number ◽  
Lepton Number ◽  
Tau Decays

scholarly journals WHAT IS A MATTER PARTICLE?

2006 ◽  
Vol 15 (01) ◽  
pp. 259-272
Author(s):  
TSAN UNG CHAN
Keyword(s):  
Standard Model ◽  
Weak Interaction ◽  
Strong Interaction ◽  
Neutral Particle ◽  
Z Bosons ◽  
Baryon Number ◽  
Lepton Number ◽  
Neutral Particles ◽  
The Standard Model ◽  
The Stability

Positive baryon numbers (A>0) and positive lepton numbers (L>0) characterize matter particles while negative baryon numbers and negative lepton numbers characterize antimatter particles. Matter particles and antimatter particles belong to two distinct classes of particles. Matter neutral particles are particles characterized by both zero baryon number and zero lepton number. This third class of particles includes mesons formed by a quark and an antiquark pair (a pair of matter particle and antimatter particle) and bosons which are messengers of known interactions (photons for electromagnetism, W and Z bosons for the weak interaction, gluons for the strong interaction). The antiparticle of a matter particle belongs to the class of antimatter particles, the antiparticle of an antimatter particle belongs to the class of matter particles. The antiparticle of a matter neutral particle belongs to the same class of matter neutral particles. A truly neutral particle is a particle identical with its antiparticle; it belongs necessarily to the class of matter neutral particles. All known interactions of the Standard Model conserve baryon number and lepton number; matter cannot be created or destroyed via a reaction governed by these interactions. Conservation of baryon and lepton number parallels conservation of atoms in chemistry; the number of atoms of a particular species in the reactants must equal the number of those atoms in the products. These laws of conservation valid for interaction involving matter particles are indeed valid for any particles (matter particles characterized by positive numbers, antimatter particles characterized by negative numbers, and matter neutral particles characterized by zero). Interactions within the framework of the Standard Model which conserve both matter and charge at the microscopic level cannot explain the observed asymmetry of our Universe. The strong interaction was introduced to explain the stability of nuclei: there must exist a powerful force to compensate the electromagnetic force which tends to cause protons to fly apart. The weak interaction with laws of conservation different from electromagnetism and the strong interaction was postulated to explain beta decay. Our observed material and neutral universe would signify the existence of another interaction that did conserve charge but did not conserve matter.

THERMAL LEPTOGENESIS IN SO(10) GUT

2008 ◽  
Vol 23 (17n20) ◽  
pp. 1464-1469 ◽  
Author(s):  
XIANGDONG JI
Keyword(s):  
Thermal Equilibrium ◽  
Baryon Number ◽  
Lepton Number ◽  
Grand Unification ◽  
The Universe ◽  
Lepton Number Violating

I discuss the possibility of generating the observed baryon number in the universe through the lepton-number violating processes in a class of SO(10) grand unification theories. The key ingredient is the CP violating decay of the heavy right-handed neutrinos out of thermal equilibrium.

LEE–YANG FORCE, GAUGE SYMMETRY AND "DARK ENERGY"

2005 ◽  
Vol 20 (37) ◽  
pp. 2855-2859 ◽  
Author(s):  
JONG-PING HSU
Keyword(s):  
Dark Energy ◽  
Gauge Symmetry ◽  
Baryon Number ◽  
Lepton Number ◽  
Repulsive Force ◽  
Baryonic Matter ◽  
Gauge Invariant ◽  
Einstein's Equation ◽  
Expansion Of The Universe ◽  
The Universe

In 1955, Lee and Yang discussed a new massless gauge field based on the established conservation of baryon number. They predicted the existence of a repulsive force between baryonic matter, just as the conservation of electron–lepton number was later shown to imply the existence of a repulsive force between electrons. Although Eötvös experiments showed the force to be undetectably small at that time, such a force may be related to the dark-energy-induced acceleration of the expansion of the universe. If the gauge invariant Lagrangian involves a spacetime derivative of the field strength, the resultant potential has properties similar to that of the "dark energy" implied by the cosmological constant in the Einstein's equation.

ALTERNATIVE LOW ENERGY SUPERSYMMETRY

1990 ◽  
Vol 05 (07) ◽  
pp. 467-472 ◽  
Author(s):  
LAWRENCE J. HALL
Keyword(s):  
Baryon Number ◽  
Lepton Number ◽  
Low Energy ◽  
Additional Symmetry ◽  
Alternative Models ◽  
Gauge Symmetries

Models of low energy supersymmetry require some additional symmetry beyond the known gauge symmetries. The usual preference for R parity, which leads to the standard low energy supersymmetry model, has no clear theoretical motivation. The alternative models with minimal field content are reviewed. In one case R parity is spontaneously broken by a large sneutrino vev. In three other cases R parity is replaced by an alternative symmetry; baryon number, lepton number or ZN.

Search for lepton-number and lepton-flavour violation in tau decays

1987 ◽  
Vol 185 (1-2) ◽  
pp. 228-232 ◽  
Author(s):  
H. Albrecht ◽  
U. Binder ◽  
P. Böckmann ◽  
R. Gläser ◽  
G. Harder ◽  
...  
Keyword(s):  
Lepton Number ◽  
Tau Decays ◽  
Lepton Flavour Violation ◽  
Flavour Violation ◽  
Lepton Flavour

A GENERATION MODEL OF THE FUNDAMENTAL PARTICLES

2002 ◽  
Vol 11 (06) ◽  
pp. 555-566 ◽  
Author(s):  
B. A. ROBSON
Keyword(s):  
Particle Number ◽  
Baryon Number ◽  
Lepton Number ◽  
Generation Model ◽  
Charge Particle ◽  
New Classification ◽  
Fundamental Particles ◽  
Quantum Numbers ◽  
The Standard Model

A new classification of the fundamental particles based upon the use of only three additive quantum numbers (charge, particle number, generation quantum number) compared with the nine additive quantum numbers of the Standard Model (charge, lepton number, muon lepton number, tau lepton number, baryon number, strangeness, charm, bottomness, topness) is presented. This classification provides a new basis for the weak isospin symmetry characteristic of both leptons and quarks.

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