Puzzles in Hadronic Charmonium Decays

1997 ◽  
Vol 12 (22) ◽  
pp. 4069-4078 ◽  
Author(s):  
Stephen L. Olsen
Keyword(s):  
Pseudoscalar Meson ◽  
Experimental Studies ◽  
Decay Rates ◽  
Hadronic Decays ◽  
Final States ◽  
Tensor Meson ◽  
Meson Decays ◽  
Charmonium States

Recent results of experimental studies of hadronic decays of charmonium states using the BES detector are reported. A number of puzzling features are observed. Foremost among these is the large discrepancy between the decay rates for J/ψ and ψ(2S) decays to ρπ and [Formula: see text] final states, first observed by the Mark II experiment. We find suppressions for ψ(2S) decays to these modes of factors in excess of sixty and twenty, respectively. Similar, although less dramatic, suppressions of vector plus tensor meson final states are also observed. No suppression is seen for axialvector plus pseudoscalar meson decays, but a strong flavor-SU(3) violation is seen in [Formula: see text] final states that has an opposite character for the J/ψ and ψ(2S).

scholarly journals ORGANIC CARBON DYNAMICS IN GRASSLAND SOILS. 1. BACKGROUND INFORMATION AND COMPUTER SIMULATION

1981 ◽  
Vol 61 (2) ◽  
pp. 185-201 ◽  
Author(s):  
J. A. VAN VEEN ◽  
E. A. PAUL
Keyword(s):  
Organic Matter ◽  
Soil Organic Matter ◽  
Experimental Studies ◽  
Decay Rates ◽  
Background Information ◽  
Plant Residues ◽  
Decomposition Rates ◽  
Straw Decomposition ◽  
Soil Biomass ◽  
The World

The decomposition rates of 14C-labelled plant residues in different parts of the world were characterized and mathematically simulated. The easily decomposable materials, cellulose and hemicellulose, were described as being decomposed directly by the soil biomass; the lignin fraction of aboveground residues and the resistant portion of the roots entered a decomposable native soil organic matter. Here it could be decomposed by the soil biomass or react with other soil constituents in the formation of more recalcitrant soil organic matter. The transformation rates were considered to be independent of biomass size (first–order). Data from 14C plant residue incorporation studies which yielded net decomposition rates of added materials and from carbon dating of the recalcitrant soil organic matter were transformed to gross decomposition rate constants for three soil depths. The model adequately described soil organic matter transformations under native grassland and the effect of cultivation on organic matter levels. Correction for microbial growth and moisture and temperature variations showed that the rate of wheat straw decomposition, based on a full year in the field in southern Saskatchewan, was 0.05 that under optimal laboratory conditions. The relative decay rates for plant residues during the summer months of the North American Great Plains was 0.1 times that of the laboratory. Comparison with data from other parts of the world showed an annual relative rate of 0.12 for straw decomposition in England, whereas gross decomposition rates in Nigeria were 0.5 those of laboratory rates. Both the decomposable and recalcitrant organic matter were found to be affected by the extent of physical protection within the soil. The extent of protection was simulated and compared to data from experimental studies on the persistence of 14C-labelled amino acids in soil. The extent of protection influenced the steady-state levels of soil carbon upon cultivation more than did the original decomposition rates of the plant residues.

B- MESON DECAYS INTO $D^0_1+P^-(V^-)$ IN HQET

1999 ◽  
Vol 14 (03) ◽  
pp. 161-168
Author(s):  
RUKMANI MOHANTA ◽  
ANJAN K. GIRI
Keyword(s):  
B Meson ◽  
Decay Rates ◽  
P Wave ◽  
B Meson Decays ◽  
Meson Decays ◽  
Weak Decays ◽  
Experimental Values

The two-body nonleptonic weak decays [Formula: see text], where [Formula: see text] is a narrow p-wave charm resonance, are investigated using the generalized factorization hypothesis along with the HQET. The estimated decay rates for these processes agree reasonably well with the current experimental values.

scholarly journals QCD factorization for exclusive non-leptonic -meson decays: general arguments and the case of heavy–light final states

2000 ◽  
Vol 591 (1-2) ◽  
pp. 313-418 ◽  
Author(s):  
M. Beneke ◽  
G. Buchalla ◽  
M. Neubert ◽  
C.T. Sachrajda
Keyword(s):  
Final States ◽  
Meson Decays ◽  
Qcd Factorization

scholarly journals DALITZ ANALYSES: A TOOL FOR PHYSICS WITHIN AND BEYOND THE STANDARD MODEL

2006 ◽  
Vol 21 (27) ◽  
pp. 5503-5512 ◽  
Author(s):  
M. R. PENNINGTON
Keyword(s):  
Standard Model ◽  
Strong Coupling Regime ◽  
Hadronic Decays ◽  
Beyond The Standard Model ◽  
Final States ◽  
Matrix Elements ◽  
Final State ◽  
Ckm Matrix ◽  
The Standard Model ◽  
Final State Interactions

Dalitz analyses are introduced as the method for studying hadronic decays. An accurate description of hadron final states is critical not only to an understanding of the strong coupling regime of QCD, but also to the precision extraction of CKM matrix elements. The relation of such final state interactions to scattering processes is discussed.

scholarly journals Study of the ρ and ω meson decays into a pseudoscalar meson and e+e− pair with the CMD-2 detector

2005 ◽  
Vol 613 (1-2) ◽  
pp. 29-38 ◽  
Author(s):  
R.R. Akhmetshin ◽  
V.M. Aulchenko ◽  
V.Sh. Banzarov ◽  
A. Baratt ◽  
L.M. Barkov ◽  
...  
Keyword(s):  
Pseudoscalar Meson ◽  
Meson Decays

Rare B meson decays to charmed final states at Belle $(B\to D^{(*)} K^-, B^0\to D^+_s \pi^-)$

2001 ◽  
Vol 16 (supp01a) ◽  
pp. 464-467
Author(s):  
◽  
Yangheng Zheng
Keyword(s):  
B Meson ◽  
Branching Fraction ◽  
Final States ◽  
B Meson Decays ◽  
Meson Decays ◽  
Belle Detector ◽  
Upper Limit ◽  
Cabibbo Suppressed

We report observations of the Cabibbo-suppressed decays B→ D(*)K and an upper limit for the decay branching fraction for [Formula: see text] using a 5.3fb-1 data sample accumulated at the ϒ(4S) resonance with the Belle detector at the KEKB e+e- asymmetric collider.

Identified final states in the hadronic decays of the Z

1996 ◽  
Vol 371 (1-2) ◽  
pp. 200-203
Author(s):  
R Campion ◽  
A De Angelis ◽  
B De Lotto ◽  
F Hahn ◽  
K Huet ◽  
...  
Keyword(s):  
Hadronic Decays ◽  
Final States
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