scholarly journals Leptonic Decays of Vector Mesons: The Branching Ratio of the Electron-Positron Decay Mode of the Rho Meson

1967 ◽  
Vol 19 (15) ◽  
pp. 869-872 ◽  
Author(s):  
J. G. Asbury ◽  
U. Becker ◽  
William K. Bertram ◽  
P. Joos ◽  
M. Rohde ◽  
...  
Keyword(s):  
Decay Mode ◽  
Branching Ratio ◽  
Vector Mesons ◽  
Leptonic Decays ◽  
Rho Meson ◽  
Electron Positron ◽  
Positron Decay

scholarly journals Leptonic Decays of Vector Mesons: the Branching Ratio of the Electron-Positron Decay Mode of the Phi Meson

1968 ◽  
Vol 21 (21) ◽  
pp. 1504-1507 ◽  
Author(s):  
U. Becker ◽  
William K. Bertram ◽  
M. Binkley ◽  
C. L. Jordan ◽  
T. M. Knasel ◽  
...  
Keyword(s):  
Decay Mode ◽  
Branching Ratio ◽  
Phi Meson ◽  
Vector Mesons ◽  
Leptonic Decays ◽  
Electron Positron ◽  
Positron Decay

ELECTROWEAK MEASUREMENTS FROM RUN II AT THE TEVATRON

2004 ◽  
Vol 19 (06) ◽  
pp. 794-807
Author(s):  
T. R. WYATT
Keyword(s):  
Cross Section ◽  
Branching Ratio ◽  
Centre Of Mass ◽  
Mass Energy ◽  
Total Decay Width ◽  
Decay Modes ◽  
Leptonic Decays ◽  
Vector Bosons ◽  
First Time ◽  
Intermediate Vector

The CDF and DØ detectors were fully commissioned for physics running in Run II at the Tevatron [Formula: see text] collider in early 2002. Since then both experiments have collected data samples corresponding to an integrated luminosity of around ∫L=200 pb -1 at a [Formula: see text] centre-of-mass energy of [Formula: see text]. Datasets corresponding ∫L=120 pb-1 have been analyzed for physics so far. Recent electroweak measurements from Run II are reviewed. Cross section times branching ratio measurements (σ· Br ) are presented for the intermediate vector bosons (IVB's) in their leptonic decay modes: W→ℓν and Z→ℓ+ℓ-. For the first time, a combination of the σ· Br results from the CDF and DØ experiments is made; this includes using a consistent choice of the total inelastic [Formula: see text] cross section for the luminosity determinations of the two experiments. Quantities derived from these σ· Br values are also updated. These include: R ℓ the ratio of the σ· Br values for W and Z; Br (W→ℓν), the leptonic branching ratio of the W; and Γw, the total decay width of the W. Other measurements using events containing W and Z leptonic decays are presented, including studies that probe the QCD phenomenology of W/Z production and searches for events containing two intermediate vector bosons.

scholarly journals GENERALIZED POLARIZABILITY OF NEUTRAL PIONS OF THE PROCESS e-e+ →π0π0γ IN THE NJL MODEL

2011 ◽  
Vol 26 (20) ◽  
pp. 3337-3346
Author(s):  
A. I. AHMADOV ◽  
E. A. KURAEV ◽  
M. K. VOLKOV
Keyword(s):  
Dalitz Plot ◽  
Neutral Pion ◽  
Vector Mesons ◽  
Annihilation Channel ◽  
Neutral Pions ◽  
Njl Model ◽  
Electron Positron ◽  
Intermediate Vector

Differential distributions in the π0π0γ system created in the annihilation channel of an electron–positron collision are considered. The energy fractions of the pions (Dalitz-plot) distribution are presented in a general form and in approximation of intermediate vector mesons (excited and ordinary ones). It is pointed out that in relevant experiments the generalized polarizability of the neutral pion can be measured. Numerical illustrations are presented.

scholarly journals SPECTATOR EFFECTS IN THE DECAY B→Kγγ

2005 ◽  
Vol 20 (17) ◽  
pp. 4079-4084 ◽  
Author(s):  
A. YU. IGNATIEV ◽  
G. C. JOSHI ◽  
B. H. J. MCKELLAR
Keyword(s):  
Standard Model ◽  
Decay Mode ◽  
Short Distance ◽  
Enhancement Factor ◽  
Rare Decay ◽  
Branching Ratio ◽  
The Spectator

We report the results of the first computation related to the study of the spectator effects in the rare decay mode B→Kγγ within the framework of Standard Model. It is found that the account of these effects results in the enhancement factor for the short-distance reducible contribution to the branching ratio.

SEARCH FOR EXOTIC EFFECTS IN η MESON LEPTONIC DECAYS

2011 ◽  
Vol 26 (03n04) ◽  
pp. 630-631
Author(s):  
◽  
MARCIN BERŁOWSKI
Keyword(s):  
Storage Ring ◽  
Dalitz Decay ◽  
Leptonic Decays ◽  
Electron Positron ◽  
Significant Data

The search for the decay η → e+e- was carried out using the WASA detector at the COSY storage ring. Data were taken during a two week experimental run in Sept-Nov 2008 in which about 107 η mesons were collected from the reaction of pp → ppη at energy of 1.4 GeV. Background studies were performed for several different reactions. The performance of the WASA detector for the measurement of electron-positron pairs based on the single Dalitz decay of the η meson was studied. We also identified a statistically significant data sample of other more frequent leptonic decays.

NEW PHYSICS AND INVISIBLE DECAY OF ORTHOPOSITRONIUM

2004 ◽  
Vol 19 (23) ◽  
pp. 3819-3832 ◽  
Author(s):  
PAOLO CRIVELLI
Keyword(s):  
Decay Mode ◽  
Extra Dimensions ◽  
Experimental Approach ◽  
Charged Particles ◽  
Branching Ratio ◽  
New Physics ◽  
Gauge Bosons ◽  
Invisible Decays ◽  
Invisible Decay

We propose an experiment to search for invisible decays of orthopositronium (o-Ps) with the 90% confidence sensitivity in the branching ratio as low as 10-8. Evidence for this decay mode would unambiguosly signal new physics: either the existence of extra–dimensions or fractionally charged particles or new light gauge bosons. The experimental approach and the detector components of the proposed experiment are described.

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