scholarly journals Proton decay matrix elements with physical quark masses

2020 ◽  
Author(s):  
Yasumichi Aoki ◽  
Yoshinobu Kuramashi ◽  
Eigo Shintani ◽  
Natsuki Tsukamoto ◽  
Keyword(s):  
Proton Decay ◽  
Matrix Elements ◽  
Quark Masses

scholarly journals Light-cone sum rules for proton decay

2021 ◽  
Vol 2021 (5) ◽  
Author(s):  
Ulrich Haisch ◽  
Amando Hala
Keyword(s):  
Lattice Qcd ◽  
Light Cone ◽  
Sum Rules ◽  
State Of The Art ◽  
Form Factors ◽  
Baryon Number ◽  
Proton Decay ◽  
Matrix Elements ◽  
Decay Channels ◽  
Systematic Uncertainties

Abstract We estimate the form factors that parametrise the hadronic matrix elements of proton-to-pion transitions with the help of light-cone sum rules. These form factors are relevant for semi-leptonic proton decay channels induced by baryon-number violating dimension-six operators, as typically studied in the context of grand unified theories. We calculate the form factors in a kinematical regime where the momentum transfer from the proton to the pion is space-like and extrapolate our final results to the regime that is relevant for proton decay. In this way, we obtain estimates for the form factors that show agreement with the state-of-the-art calculations in lattice QCD, if systematic uncertainties are taken into account. Our work is a first step towards calculating more involved proton decay channels where lattice QCD results are not available at present.

scholarly journals Nucleon distribution amplitudes and proton decay matrix elements on the lattice

2009 ◽  
Vol 79 (3) ◽  
Author(s):  
Vladimir M. Braun ◽  
Meinulf Göckeler ◽  
Roger Horsley ◽  
Thomas Kaltenbrunner ◽  
Yoshifumi Nakamura ◽  
...  
Keyword(s):  
Proton Decay ◽  
Matrix Elements

scholarly journals Proton decay matrix elements on the lattice

2014 ◽  
Vol 89 (1) ◽  
Author(s):  
Y. Aoki ◽  
E. Shintani ◽  
A. Soni ◽  
Keyword(s):  
Proton Decay ◽  
Matrix Elements

scholarly journals BOUNDS ON QUARK MASS MATRICES ELEMENTS DUE TO MEASURED PROPERTIES OF THE MIXING MATRIX AND PRESENT VALUES OF THE QUARK MASSES

2008 ◽  
Vol 23 (11) ◽  
pp. 1729-1746 ◽  
Author(s):  
S. CHATURVEDI ◽  
V. GUPTA ◽  
G. SÁNCHEZ-COLÓN
Keyword(s):  
Energy Scale ◽  
Matrix Elements ◽  
Specific Mass ◽  
Quark Masses ◽  
Quark Sector ◽  
Mass Matrices ◽  
Simple Generalization ◽  
Mixing Matrix ◽  
Extra Parameter

We obtain constraints on possible structures of mass matrices in the quark sector by using as experimental restrictions the determined values of the quark masses at the MZ energy scale, the magnitudes of the quark mixing matrix elements V ud , V us , V cd and V cs , and the Jarlskog invariant J(V). Different cases of specific mass matrices are examined in detail. The quality of the fits for the Fritzsch- and Stech-type mass matrices is about the same with χ2/ d.o.f. = 4.23/3 = 1.41 and χ2/ d.o.f. = 9.10/4 = 2.28, respectively. The fit for a simple generalization (one extra parameter) of the Fritzsch type matrices, in the physical basis, is much better with χ2/ d.o.f. = 1.89/4 = 0.47. For comparison we also include the results using the quark masses at the 2 GeV energy scale. The fits obtained at this energy scale are similar to that at MZ energy scale, implying that our results are unaffected by the evolution of the quark masses from 2 to 91 GeV.

scholarly journals Improved lattice computation of proton decay matrix elements

2017 ◽  
Vol 96 (1) ◽  
Author(s):  
Yasumichi Aoki ◽  
Taku Izubuchi ◽  
Eigo Shintani ◽  
Amarjit Soni
Keyword(s):  
Proton Decay ◽  
Matrix Elements ◽  
Lattice Computation

TANIMOTO-TYPE QUARK MASS MATRIX WITH HIERARCHICAL TWO-STEP STRUCTURE

1994 ◽  
Vol 09 (09) ◽  
pp. 811-816
Author(s):  
YOSHIO KOIDE ◽  
HIDEO FUSAOKA
Keyword(s):  
Quark Mass ◽  
Mass Matrix ◽  
Point Of View ◽  
Matrix Form ◽  
Matrix Elements ◽  
Quark Masses ◽  
Step Structure ◽  
Simple Mass ◽  
Phenomenological Point

A possibility that the quark mass matrix is described in terms of only two terms with hierarchically different magnitudes is investigated from a phenomenological point of view. We find a simple mass matrix form which can provide reasonable predictions of quark masses and Kobayashi-Maskawa matrix elements.

scholarly journals PROTON DECAY, FERMION MASSES AND TEXTURE FROM EXTRA DIMENSIONS IN SUSY GUT's

2004 ◽  
Vol 19 (11) ◽  
pp. 1715-1736 ◽  
Author(s):  
MITSURU KAKIZAKI ◽  
MASAHIRO YAMAGUCHI
Keyword(s):  
Extra Dimension ◽  
Mass Matrix ◽  
Spatial Dimension ◽  
Proton Decay ◽  
Mass Scale ◽  
Wave Functions ◽  
Fermion Mass ◽  
Quark Masses ◽  
Fermion Masses ◽  
The Hierarchical Structure

In supersymmetry, there are gauge invariant dimension 5 proton decay operators which must be suppressed by a mass scale much larger than the Planck mass. It is natural to expect that this suppression should be explained by a mechanism that explains the hierarchical structure of the fermion mass matrices. We apply this argument to the case where wave functions of chiral multiplets are localized under a kink background along an extra spatial dimension and the Yukawa couplings as well as the coefficients of the proton decay operators are determined by the overlap of the relevant wave functions. A configuration is found in the context of SU(5) supersymmetric grand unified theory that yields realistic values of quark masses, mixing angles, CP phase and charged lepton masses and sufficiently small genuine dimension 5 proton decay operators. Inclusion of SU(5) breaking effects is essential in order to obtain non-vanishing CP phase as well as correct lepton masses. The resulting mass matrix has a texture structure in which texture zeros are a consequence of extremely small overlap of the wave functions. Our approach requires explicit breaking of supersymmetry in the extra dimension, which can be realized in (de)constructing extra dimension.

scholarly journals Lattice QCD determination of neutron-antineutron matrix elements with physical quark masses

2019 ◽  
Vol 99 (7) ◽  
Author(s):  
Enrico Rinaldi ◽  
Sergey Syritsyn ◽  
Michael L. Wagman ◽  
Michael I. Buchoff ◽  
Chris Schroeder ◽  
...  
Keyword(s):  
Lattice Qcd ◽  
Matrix Elements ◽  
Quark Masses

scholarly journals Matrix elements without quark masses on the lattice

2000 ◽  
Vol 83-84 ◽  
pp. 238-240
Author(s):  
A. Donini ◽  
V. Giménez ◽  
L. Giusti ◽  
G. Martinelli
Keyword(s):  
Matrix Elements ◽  
Quark Masses
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