scholarly journals Exotic meson decay widths using lattice QCD

2006 ◽  
Vol 74 (3) ◽  
Author(s):  
M. S. Cook ◽  
H. R. Fiebig
Keyword(s):  
Lattice Qcd ◽  
Meson Decay ◽  
Exotic Meson ◽  
Decay Widths

scholarly journals Lowering the scale of Pati-Salam breaking through seesaw mixing

2021 ◽  
Vol 2021 (5) ◽  
Author(s):  
Matthew J. Dolan ◽  
Tomasz P. Dutka ◽  
Raymond R. Volkas
Keyword(s):  
Degrees Of Freedom ◽  
Tree Level ◽  
Charged Current ◽  
Meson Decay ◽  
Neutrino Masses ◽  
Down Quark ◽  
The Standard Model ◽  
Decay Widths ◽  
Left And Right ◽  
Charged Leptons

Abstract We analyse the experimental limits on the breaking scale of Pati-Salam extensions of the Standard Model. These arise from the experimental limits on rare-meson decay processes mediated at tree-level by the vector leptoquark in the model. This leptoquark ordinarily couples to both left- and right-handed SM fermions and therefore the meson decays do not experience a helicity suppression. We find that the current limits vary from $$ \mathcal{O} $$ O (80–2500) TeV depending on the choice of matrix structure appearing in the relevant three-generational charged-current interactions. We extensively analyse scenarios where additional fermionic degrees of freedom are introduced, transforming as complete Pati-Salam multiplets. These can lower the scales of Pati-Salam breaking through mass-mixing within the charged-lepton and down-quark sectors, leading to a helicity suppression of the meson decay widths which constrain Pati-Salam breaking. We find four multiplets with varying degrees of viability for this purpose: an SU(2)L/R bidoublet, a pair of SU(4) decuplets and either an SU(2)L or SU(2)R triplet all of which contain heavy exotic versions of the SM charged leptons. We find that the Pati-Salam limits can be as low as $$ \mathcal{O} $$ O (5–150) TeV with the addition of these four multiplets. We also identify an interesting possible connection between the smallness of the neutrino masses and a helicity suppression of the Pati-Salam limits for three of the four multiplets.

scholarly journals B-Meson Decay Constant from Unquenched Lattice QCD

2005 ◽  
Vol 95 (21) ◽  
Author(s):  
Alan Gray ◽  
Matthew Wingate ◽  
Christine T. H. Davies ◽  
Emel Gulez ◽  
G. Peter Lepage ◽  
...  
Keyword(s):  
Lattice Qcd ◽  
Decay Constant ◽  
B Meson ◽  
Meson Decay ◽  
B Meson Decay

scholarly journals Hybrid Exotic Meson Decay Width

2005 ◽  
Author(s):  
Merritt Cook ◽  
H. R. Fiebig
Keyword(s):  
Decay Width ◽  
Meson Decay ◽  
Exotic Meson

Vector-meson decay into pseudoscalar mesons from quenched lattice QCD

1989 ◽  
Vol 39 (9) ◽  
pp. 2692-2700 ◽  
Author(s):  
Richard D. Loft ◽  
Thomas A. DeGrand
Keyword(s):  
Vector Meson ◽  
Lattice Qcd ◽  
Meson Decay ◽  
Pseudoscalar Mesons
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