scholarly journals A DYNAMICAL MECHANISM TO EXPLAIN THE TOP-BOTTOM QUARK MASS HIERARCHY

2005 ◽  
Vol 20 (32) ◽  
pp. 7567-7577 ◽  
Author(s):  
A. DOFF ◽  
A. A. NATALE
Keyword(s):  
Gauge Symmetry ◽  
Gauge Group ◽  
Quark Mass ◽  
Bottom Quark ◽  
Mass Splitting ◽  
Bottom Quarks ◽  
Mass Hierarchy ◽  
Dynamical Mechanism ◽  
Isospin Violation

We discuss the mass splitting between the the top and bottom quarks in a technicolor scenario. The model proposed here contains a left–right electroweak gauge group. An extended technicolor group and mirror fermions are introduced. The top-bottom quark mass splitting turns out to be intimately connected to the breaking of the left–right gauge symmetry. Weak isospin violation occurs within the experimental limits.

Quark mass differences and isospin violation in the pion-nucleon coupling constants

1989 ◽  
Vol 39 (5) ◽  
pp. 2054-2056 ◽  
Author(s):  
Véronique Bernard ◽  
Ulf-G. Meissner
Keyword(s):  
Quark Mass ◽  
Coupling Constants ◽  
Isospin Violation ◽  
Pion Nucleon

scholarly journals A multi-component SIMP model with U(1)X → Z2 × Z3

2021 ◽  
Vol 2021 (9) ◽  
Author(s):  
Soo-Min Choi ◽  
Jinsu Kim ◽  
Pyungwon Ko ◽  
Jinmian Li
Keyword(s):  
Dark Matter ◽  
Gauge Symmetry ◽  
Mass Difference ◽  
Massive Particle ◽  
Large Mass ◽  
Small Mass ◽  
Dark Matter Candidate ◽  
Mass Hierarchy ◽  
New Class ◽  
Matter Fields

Abstract Multi-component dark matter scenarios are studied in the model with U(1)X dark gauge symmetry that is broken into its product subgroup Z2 × Z3 á la Krauss-Wilczek mechanism. In this setup, there exist two types of dark matter fields, X and Y, distinguished by different Z2 × Z3 charges. The real and imaginary parts of the Z2-charged field, XR and XI, get different masses from the U(1)X symmetry breaking. The field Y, which is another dark matter candidate due to the unbroken Z3 symmetry, belongs to the Strongly Interacting Massive Particle (SIMP)-type dark matter. Both XI and XR may contribute to Y’s 3 → 2 annihilation processes, opening a new class of SIMP models with a local dark gauge symmetry. Depending on the mass difference between XI and XR, we have either two-component or three-component dark matter scenarios. In particular two- or three-component SIMP scenarios can be realised not only for small mass difference between X and Y, but also for large mass hierarchy between them, which is a new and unique feature of the present model. We consider both theoretical and experimental constraints, and present four case studies of the multi-component dark matter scenarios.

scholarly journals NNNLO determination of the bottom-quark mass from non-relativistic sum rules

2016 ◽  
Author(s):  
Andreas Maier ◽  
Martin Beneke ◽  
Jan Piclum ◽  
Thomas Rauh
Keyword(s):  
Quark Mass ◽  
Sum Rules ◽  
Bottom Quark

scholarly journals Charm effects in the bottom quark mass from ϒ mesons

2000 ◽  
Vol 483 (1-3) ◽  
pp. 94-98 ◽  
Author(s):  
A.H. Hoang ◽  
A.V. Manohar
Keyword(s):  
Quark Mass ◽  
Bottom Quark

scholarly journals The bottom quark mass from sum rules at next-to-next-to-leading order

1999 ◽  
Vol 471 (2-3) ◽  
pp. 233-243 ◽  
Author(s):  
M. Beneke ◽  
A. Signer
Keyword(s):  
Quark Mass ◽  
Sum Rules ◽  
Bottom Quark ◽  
Leading Order

GENERALIZED NONCOMMUTATIVE SUPERALGEBRAS

2003 ◽  
Vol 18 (08) ◽  
pp. 587-599 ◽  
Author(s):  
REZA ABBASPUR
Keyword(s):  
Gauge Symmetry ◽  
Gauge Group ◽  
Central Extension ◽  
Unified Framework ◽  
Fermionic Operators ◽  
Gauge Connection

Using the notions of gauge symmetry and gauge connection on ordinary superspaces, we derive a class of generalized supertranslation algebras in the case of N = 1, D = 2 Euclidean superspace with a U(1) gauge group. This generalizes the ordinary algebra by inclusion of some additional bosonic and fermionic operators which are interpreted as the generators of the U(1) gauge symmetry on superspace. The generalized superalgebra closes only for very particular configurations of the gauge connection superfield. This provides a unified framework for a variety of generalizations of the ordinary superalgebra such as its central extension and its noncommutative deformation found in an earlier work.

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