scholarly journals Study of the Dalitz decay J/ψ→e+e−η

2019 ◽  
Vol 99 (1) ◽  
Author(s):  
M. Ablikim ◽  
M. N. Achasov ◽  
S. Ahmed ◽  
M. Albrecht ◽  
M. Alekseev ◽  
...  
Keyword(s):  
Dalitz Decay

scholarly journals Measurement of the branching ratio of π0 Dalitz decay using KL→π0π0π0 decays

2019 ◽  
Vol 100 (3) ◽  
Author(s):  
E. Abouzaid ◽  
M. Arenton ◽  
A. R. Barker ◽  
L. Bellantoni ◽  
E. Blucher ◽  
...  
Keyword(s):  
Branching Ratio ◽  
Dalitz Decay

scholarly journals Observation of the electromagnetic Dalitz decay D*0→D0e+e−

2021 ◽  
Vol 104 (11) ◽  
Author(s):  
M. Ablikim ◽  
M. N. Achasov ◽  
P. Adlarson ◽  
S. Ahmed ◽  
M. Albrecht ◽  
...  
Keyword(s):  
Dalitz Decay

scholarly journals Studying time-like electromagnetic baryonic transitions with HADES in pion induced reactions

2020 ◽  
Vol 241 ◽  
pp. 01012
Author(s):  
Béatrice Ramstein
Keyword(s):  
Center Of Mass ◽  
Quantitative Description ◽  
Form Factors ◽  
Resonance Region ◽  
Partial Wave Analysis ◽  
Real Photon ◽  
Pion Beam ◽  
Dalitz Decay ◽  
Covariant Model ◽  
Proton Induced Reactions

A dedicated programme aiming at studying electromagnetic baryonic transitions in the time-like region has started at GSI using the pion beam and the High Acceptance Di-Electron Spectrometer (HADES) set-up. A pioneering experiment has been carried out in the second resonance region, at a center-of-mass energy of 1.49 GeV, using carbon and polyethylene targets, allowing for an analysis of the inclusive e+e- production and of the exclusive quasi-free π-p → ne+e- reaction, in complement to hadronic channels. Predictions for the Dalitz decay of N(1520) and N(1535) based on real photon couplings strongly underestimate the e+e- yield at invariant masses larger than 300 MeV/c2, which signals effects of time-like baryon transition form factors, in qualitative agreement with the Vector Dominance Models (VDM). A quantitative description of the observed e+e- yield is achieved by taking into account the contribution from off-shell ρs. The latter was provided by the preliminary results of a Bonn-Gatchina Partial Wave Analysis of the two-pion production channels, which were measured simultaneously in our experiment. A good agreement is also obtained using a covariant model for the time-like electromagnetic form factors for the N-N(1520) transition. The angular distributions for the e+e- production contain additional selective information on the spin structure of the different transitions. The measurements with the pion beam will be extended in future in the third resonance region. Hyperon Dalitz decay studies in proton induced reactions are also foreseen.

Observation of the Dalitz Decay Modes of theKL0

1980 ◽  
Vol 44 (8) ◽  
pp. 525-528 ◽  
Author(s):  
A. S. Carroll ◽  
I. -H. Chiang ◽  
T. F. Kycia ◽  
K. K. Li ◽  
L. Littenberg ◽  
...  
Keyword(s):  
Dalitz Decay ◽  
Decay Modes

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.

scholarly journals Δ(1232) Dalitz decay in proton-proton collisions at T=1.25 GeV measured with HADES at GSI

2017 ◽  
Vol 95 (6) ◽  
Author(s):  
J. Adamczewski-Musch ◽  
O. Arnold ◽  
E. T. Atomssa ◽  
C. Behnke ◽  
A. Belounnas ◽  
...  
Keyword(s):  
Proton Proton ◽  
Dalitz Decay ◽  
Proton Collisions ◽  
Proton Proton Collisions

scholarly journals Search for theη→ e+e−e+e−double Dalitz decay

2011 ◽  
Vol 312 (10) ◽  
pp. 102016
Author(s):  
Patrick Wurm ◽  
Keyword(s):  
Dalitz Decay

scholarly journals PARITY OF NEUTRAL PION

2011 ◽  
Vol 20 (09) ◽  
pp. 1961-1965 ◽  
Author(s):  
B. A. ROBSON
Keyword(s):  
Neutral Pion ◽  
Composite Model ◽  
Dalitz Decay

The paper discusses the parity of the neutral pion. It is shown that the recent determination of the parity of the neutral pion using the double Dalitz decay π0→e+e-e+e- is compatible with the mixed-parity nature of the neutral pion predicted by a recent composite model.

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