scholarly journals IMPLICATIONS OF PRECISION MEASUREMENTS ON TEXTURE SPECIFIC FERMION MASS MATRICES

2009 ◽  
Vol 24 (18n19) ◽  
pp. 3462-3468 ◽  
Author(s):  
MANMOHAN GUPTA ◽  
GULSHEEN AHUJA ◽  
ROHIT VERMA
Keyword(s):  
Precision Measurements ◽  
Fermion Mass ◽  
Neutrino Masses ◽  
Matrix Elements ◽  
Specific Mass ◽  
Inverted Hierarchy ◽  
Ckm Matrix ◽  
Zero Mass ◽  
Mass Matrices ◽  
Ckm Matrix Elements

Implications of texture specific mass matrices have been investigated for both quarks and neutrinos. Interestingly, for the case of quarks Fritzsch-like texture 4 zero mass matrices have been found to be compatible with the present precisely known sin 2β as well as other precise CKM matrix elements. In the case of leptonic mass matrices, for both Majorana and Dirac neutrinos we find that for texture 4, 5, 6 zero mass matrices the inverted hierarchy and degenerate scenarios of neutrino masses are ruled out by the present data.

scholarly journals THE DUALIZED STANDARD MODEL AND ITS APPLICATIONS — AN INTERIM REPORT

1999 ◽  
Vol 14 (14) ◽  
pp. 2173-2203 ◽  
Author(s):  
HONG-MO CHAN ◽  
SHEUNG TSUN TSOU
Keyword(s):  
Standard Model ◽  
High Energy ◽  
Fermion Mass ◽  
Mass Hierarchy ◽  
Matrix Elements ◽  
Ckm Matrix ◽  
High Energy Cosmic Rays ◽  
Perturbative Method ◽  
Ckm Matrix Elements ◽  
Physical Consequences

Based on a non-Abelian generalization of electric–magnetic duality, the Dualized Standard Model (DSM) suggests a natural explanation for exactly three generations of fermions as the "dual colour" [Formula: see text] symmetry broken in a particular manner. The resulting scheme then offers on the one hand a fermion mass hierarchy and a perturbative method for calculating the mass and mixing parameters of the Standard Model fermions, and on the other hand testable predictions for new phenomena ranging from rare meson decays to ultra-high energy cosmic rays. Calculations to one-loop order gives, at the cost of adjusting only three real parameters, values for the following quantities all (except one) in very good agreement with experiment: the quark CKM matrix elements ‖Vrs‖, the lepton CKM matrix elements ‖Urs‖, and the second generation masses mc, ms, mμ. This means, in particular, that it gives near maximal mixing Uμ3 between νμ and ντ as observed by SuperKamiokande, Kamiokande and Soudan, while keeping small the corresponding quark angles Vcb, Vts. In addition, the scheme gives (i) rough order-of-magnitude estimates for the masses of the lowest generation, (ii) predictions for low energy FCNC effects such as KL→ eμ, and (iii) a possible explanation for the long-standing puzzle of air showers beyond the GZK cut-off. All these together, however, still represent but a portion of the possible physical consequences derivable from the DSM scheme, the majority of which are yet to be explored.

scholarly journals FRITZSCH-LIKE QUARK MASS MATRICES WITH DECOUPLED u QUARK

1994 ◽  
Vol 09 (26) ◽  
pp. 2461-2467 ◽  
Author(s):  
P.S. GILL ◽  
MANMOHAN GUPTA
Keyword(s):  
Cp Violation ◽  
Quark Mass ◽  
Matrix Elements ◽  
Ckm Matrix ◽  
Mass Matrices ◽  
Ckm Matrix Elements ◽  
Invariant Parameter

Fritzsch-like Hermitian quark mass matrices with decoupled u quark as well as nonzero 22-elements, both in ‘U’ and ‘D’ sectors, have been considered to reconcile the data regarding [Formula: see text] and CKM matrix elements. Exploiting the idea of maximality of CP-violation, we find two interesting relations between CKM matrix elements, viz. |Vtd|≅ |Vus||Vcb|, |Vub|≅ ½(ms/ mb)|Vus|. Apart from obtaining 0.05≤|Vub/Vcb|≤0.12 and [Formula: see text], we find CP-violating rephasing invariant parameter |J|≅(3–5)×10−5. The predicted |Vtd| value implies almost maximal mixing in [Formula: see text] system.

scholarly journals Implications of unitarity and precision measurements on CKM matrix elements

2007 ◽  
Vol 647 (5-6) ◽  
pp. 394-399 ◽  
Author(s):  
Gulsheen Ahuja ◽  
Manmohan Gupta ◽  
Sanjeev Kumar ◽  
Monika Randhawa
Keyword(s):  
Precision Measurements ◽  
Matrix Elements ◽  
Ckm Matrix ◽  
Ckm Matrix Elements

scholarly journals Approximate Sum Rules of CKM Matrix Elements from Quasi-Democratic Mass Matrices

1998 ◽  
Vol 99 (2) ◽  
pp. 281-291 ◽  
Author(s):  
I. S. Sogami ◽  
K. Nishida ◽  
H. Tanaka ◽  
T. Shinohara
Keyword(s):  
Sum Rules ◽  
Matrix Elements ◽  
Ckm Matrix ◽  
Mass Matrices ◽  
Ckm Matrix Elements

IMPLICATIONS OF "4 TEXTURE ZEROS" MASS MATRICES BASED ON G × SU(3)fam

1996 ◽  
Vol 11 (27) ◽  
pp. 4805-4814
Author(s):  
P. S. GILL ◽  
MANMOHAN GUPTA
Keyword(s):  
Phenomenological Models ◽  
Present Model ◽  
Unified Theory ◽  
Grand Unified Theory ◽  
Matrix Elements ◽  
Unitarity Triangle ◽  
Specific Mass ◽  
Family Symmetry ◽  
Ckm Matrix ◽  
Mass Matrices

Texture specific mass matrices generated from the grand unified theory with global family symmetry, have been investigated in the context of latest data regarding [Formula: see text], |Vub|, |Vcb|, |Vtd|, |Vts| and other parameters depending on CKM matrix elements. Unlike several other phenomenological models, the present model not only accommodates the value of [Formula: see text] in the range 150–240 GeV, encompassing the CDF and D0 values, but is also able to reproduce |Vcb| = .038 ± .003 and |Vub/Vcb| = 0.08 ± 0.02, whereas |Vtd| is predicted in the range .005–.014. Further, the angles of the unitarity triangle, related to the CP-violating asymmetries, are in the ranges -1.0 ≤ sin 2α ≤ -.1, .6 ≤ sin 2α ≤ 1.0 and .48 ≤ sin 2β ≤ .56, in agreement with other recent calculations.

scholarly journals Progress on semi-leptonic B(s) decays

2014 ◽  
Vol 29 (20) ◽  
pp. 1430019 ◽  
Author(s):  
Giulia Ricciardi
Keyword(s):  
Rare Decays ◽  
Current Status ◽  
Matrix Elements ◽  
Ckm Matrix ◽  
The Absolute ◽  
Ckm Matrix Elements

We report on the current status of semi-leptonic B(s) decays, including rare decays, and the extraction of the absolute values of the CKM matrix elements |Vcb| and |Vub|.

Chapter 22 Leptonic, Semileptonic D(DS) Decays and CKM Matrix Elements

2009 ◽  
Vol 24 (supp01) ◽  
pp. 521-567
Author(s):  
Ya-Dong Yang ◽  
Hai-Bo Li ◽  
Jia-Heng Zou ◽  
Jiang-Chuan Chen ◽  
Jian Liu ◽  
...  
Keyword(s):  
Semileptonic Decays ◽  
Matrix Elements ◽  
Ckm Matrix ◽  
Leptonic Decays ◽  
Ckm Matrix Elements

The following sections are included: Leptonic Decays Semileptonic Decays Impact on CKM Measurements

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