Recent changes in particle data group tau listings

1997 ◽  
Vol 55 (3) ◽  
pp. 23-30
Author(s):  
Kenneth G. Hayes
Keyword(s):  
Particle Data Group ◽  
Data Group

scholarly journals Power Laws and Elementary Particle Decays

Sci ◽  
2019 ◽  
Vol 1 (3) ◽  
pp. 59
Author(s):  
Leonardo Chiatti
Keyword(s):  
Elementary Particle ◽  
Power Law ◽  
Power Laws ◽  
Order Structure ◽  
Particle Data Group ◽  
Rest Energy ◽  
The Standard Model ◽  
Using Data ◽  
Particle Decays ◽  
Data Group

This study analyzes the correlation between the lifetime and the rest energy of the unstable particle states with a lifetime greater than the zeptosecond (10−21 s), using data available from the Particle Data Group. This set of states seems to be divided into three groups, in each of which the two quantities can be correlated through a remarkably accurate power law. Although this fact does not represent anything new compared to the predictions of the Standard Model, it nevertheless reveals an unexpected order structure in the set of particle decays, emerging from such predictions.

scholarly journals KAON PHOTOPRODUCTION ON THE NUCLEON WITH CONSTRAINED PARAMETERS

2009 ◽  
Vol 24 (11n13) ◽  
pp. 964-967
Author(s):  
R. NELSON ◽  
T. MART
Keyword(s):  
Experimental Data ◽  
Particle Data Group ◽  
Resonance Decay ◽  
Decay Widths ◽  
Data Group

The new experimental data of kaon photoproduction on the nucleon γp → K+Λ have been analyzed by means of a multipoles model. Different from the previous models, in this analysis the resonance decay widths are constrained to the values given by the Particle Data Group (PDG). The result indicates that constraining these parameters to the PDG values could dramatically change the conclusion of the important resonances in this reaction found in the previous studies.

scholarly journals Standard versus non-standard CP phases in neutrino oscillation in matter with non-unitarity

2020 ◽  
Vol 2020 (6) ◽  
Author(s):  
Ivan Martinez-Soler ◽  
Hisakazu Minakata
Keyword(s):  
Neutral Current ◽  
Phase Correlation ◽  
Charged Current ◽  
Unitary Matrix ◽  
Particle Data Group ◽  
Unitary Evolution ◽  
First Order ◽  
Flavor Mixing ◽  
Mixing Matrix ◽  
Data Group

Abstract We formulate a perturbative framework for the flavor transformation of the standard active three neutrinos but with a non-unitary flavor mixing matrix, a system which may be relevant for the leptonic unitarity test. We use the $\alpha$ parametrization of the non-unitary matrix and take its elements $\alpha_{\beta \gamma}$ ($\beta,\gamma = e,\mu,\tau$) and the ratio $\epsilon \simeq \Delta m^2_{21} / \Delta m^2_{31}$ as the small expansion parameters. Two qualitatively new features that hold in all the oscillation channels are uncovered in the probability formula obtained to first order in the expansion: (1) The phases of the complex $\alpha$ elements always come into the observable in the particular combination with the $\nu$SM CP phase $\delta$ in the form $[e^{- i \delta } \bar{\alpha}_{\mu e}, ~e^{ - i \delta} \bar{\alpha}_{\tau e}, ~\bar{\alpha}_{\tau \mu}]$ under the Particle Data Group convention of a unitary $\nu$SM mixing matrix. (2) The diagonal $\alpha$ parameters appear in particular combinations $\left( a/b - 1 \right) \alpha_{ee} + \alpha_{\mu \mu}$ and $\alpha_{\mu \mu} - \alpha_{\tau \tau}$, where $a$ and $b$ denote, respectively, the matter potential due to charged current and neutral current reactions. This property holds only in the unitary evolution part of the probability, and there is no such feature in the genuine non-unitary part, while the $\delta$–$\alpha$ parameter phase correlation exists for both. The reason for such remarkable stability of the phase correlation is discussed.

Semileptonic decays of D, B, K mesons and the full CKM matrix from unquenched lattice QCD

2005 ◽  
Vol 20 (15) ◽  
pp. 3469-3475 ◽  
Author(s):  
◽  
Masataka Okamoto
Keyword(s):  
Lattice Qcd ◽  
Form Factors ◽  
Semileptonic Decays ◽  
Experimental Result ◽  
Particle Data Group ◽  
Matrix Elements ◽  
Ckm Matrix ◽  
Ckm Matrix Elements ◽  
K Mesons ◽  
Data Group

We use lattice QCD to fully determine the CKM matrix. |Vcd|, |Vcs|, |Vub|, |Vcb| and |Vus| are, respectively, directly determined with our lattice results for form factors of semileptonic D → πlν, D → Klν, B → πlν, B → Dlν and K → πlν decays. The accuracy is comparable to that of the Particle Data Group averages. In addition, |Vud|, |Vtb|, |Vts| and |Vtd| are determined by using unitarity of the CKM matrix and the experimental result for sin (2β). In this way, we obtain all 9 CKM matrix elements, where the only theoretical input is lattice QCD.

scholarly journals Vector meson-baryon octet interaction and resonances generated dynamically

2014 ◽  
Vol 29 ◽  
pp. 1460211 ◽  
Author(s):  
B.-X. Sun ◽  
Y.-W. Wang
Keyword(s):  
Vector Meson ◽  
Experimental Observation ◽  
Tensor Interaction ◽  
Contact Term ◽  
Baryon Octet ◽  
Particle Data Group ◽  
S Wave ◽  
Wave Approximation ◽  
Decay Widths ◽  
Data Group

The interaction potentials between vector mesons and baryon octet are calculated explicitly with a summation of t-, s-, and u- channel diagrams and a contact term originating from the tensor interaction. Altogether, 13 resonances are generated dynamically in different channels of strangeness zero by solving the relativistic Lippman-Schwinger equations in the S-wave approximation, and their masses, decay widths, isospins and spins are determined. Some resonances are well fitted with their counterparts listed in the newest review of Particle Data Group (PDG),1 while others might stimulate the experimental observation in these energy regions in the future.

scholarly journals CP, T AND CPT VIOLATIONS IN THE $K^0-\overline{K^0}$ SYSTEM: PRESENT STATUS

2003 ◽  
Vol 18 (09) ◽  
pp. 1551-1571 ◽  
Author(s):  
YOSHIHIRO TAKEUCHI ◽  
S. Y. TSAI
Keyword(s):  
Present Status ◽  
The Other ◽  
Time Dependent ◽  
Numerical Analyses ◽  
Particle Data Group ◽  
Cpt Symmetry ◽  
Mixing Parameters ◽  
Data Group ◽  
Na48 Collaboration

The possible violation of CP, T and CPT symmetries in the [Formula: see text] system is studied in a way as phenomenological and comprehensive as possible. For this purpose, we first introduce parameters which represent violation of these symmetries in mixing parameters and decay amplitudes in a convenient and well-defined way and, treating these parameters as small, derive formulas which relate them to the experimentally measured quantities. We then perform numerical analyses to derive constraints to these symmetry-violating parameters, with the latest data reported by KTeV Collaboration, NA48 Collaboration and CPLEAR Collaboration, along with those compiled by Particle Data Group, used as inputs. The result obtained by CPLEAR Collaboration from an unconstrained fit to a time-dependent leptonic asymmetry, aided by the Bell–Steinberger relation, enables us to determine or constrain most of the parameters separately. It is shown among the other things that (1) CP and T symmetries are violated definitively at least at the level of 10-4in 2π decays, (2) CP and T symmetries are violated at least at the level of 10-3in the [Formula: see text] mixing, and (3) CPT symmetry is at present tested to the level of 10-5at the utmost.

Spectrum of light and strange baryon resonances under the decatic potential

2015 ◽  
Vol 24 (01) ◽  
pp. 1550002 ◽  
Author(s):  
Nasrin Salehi ◽  
Hassan Hassanabadi
Keyword(s):  
Mass Formula ◽  
Particle Data Group ◽  
Series Method ◽  
Power Series Method ◽  
Radial Schrödinger Equation ◽  
Baryon Mass ◽  
First Time ◽  
Data Group ◽  
Baryon Resonances ◽  
Good Agreement

In this paper, we calculate the light and strange baryons spectrum using a new baryon mass formula. For this purpose we have exactly solved the radial Schrödinger equation in six-dimensional Hilbert space under the decatic potential by power series method via a suitable ansatz to the wave function with parameters those existing in the potential function, possibly for the first time. By applying our model, we find a good agreement for the even and odd parity resonances, the excited multiplets up to 3 GeV and the position of the Roper resonances of the nucleon with the spectrum of the particle data group.

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