scholarly journals Search for the rare semi-leptonic decay J/ψ → D−e+νe + c.c.

2021 ◽  
Vol 2021 (6) ◽  
Author(s):  
◽  
M. Ablikim ◽  
M. N. Achasov ◽  
P. Adlarson ◽  
S. Ahmed ◽  
...  
Keyword(s):  
Confidence Level ◽  
Branching Fraction ◽  
Center Of Mass ◽  
Leptonic Decay ◽  
Mass Energy ◽  
Center Of Mass Energy ◽  
Upper Limit ◽  
Electron Positron

Abstract Using 10.1 × 109J/ψ events produced by the Beijing Electron Positron Collider (BEPCII) at a center-of-mass energy $$ \sqrt{s} $$ s = 3.097 GeV and collected with the BESIII detector, we present a search for the rare semi-leptonic decay J/ψ → D−e+νe + c.c. No excess of signal above background is observed, and an upper limit on the branching fraction ℬ(J/ψ → D−e+νe + c. c.) < 7.1 × 10−8 is obtained at 90% confidence level. This is an improvement of more than two orders of magnitude over the previous best limit.

scholarly journals Search for the radiative $$ {\Xi}_b^{-} $$ → Ξ−γ decay

2022 ◽  
Vol 2022 (1) ◽  
Author(s):  
◽  
R. Aaij ◽  
A. S. W. Abdelmotteleb ◽  
C. Abellán Beteta ◽  
T. Ackernley ◽  
...  
Keyword(s):  
Confidence Level ◽  
Radiative Decay ◽  
Center Of Mass ◽  
Mass Energy ◽  
Proton Proton ◽  
Proton Collisions ◽  
Center Of Mass Energy ◽  
Upper Limit ◽  
Using Data ◽  
Proton Proton Collisions

Abstract The first search for the rare radiative decay $$ {\Xi}_b^{-} $$ Ξ b − → Ξ−γ is performed using data collected by the LHCb experiment in proton-proton collisions at a center-of-mass energy of 13 TeV, corresponding to an integrated luminosity of 5.4 fb−1. The $$ {\Xi}_b^{-} $$ Ξ b − → Ξ−J/ψ channel is used as normalization. No $$ {\Xi}_b^{-} $$ Ξ b − → Ξ−γ signal is found and an upper limit of $$ \mathcal{B} $$ B ($$ {\Xi}_b^{-} $$ Ξ b − → Ξ−γ) < 1.3 × 10−4 at 95% confidence level is obtained.

scholarly journals Prospects for rare and forbidden hyperon decays at BESIII

2017 ◽  
Vol 12 (5) ◽  
Author(s):  
Hai-Bo Li
Keyword(s):  
Rare Decays ◽  
Branching Fractions ◽  
Center Of Mass ◽  
Final States ◽  
Electron Spectrometer ◽  
Mass Energy ◽  
Measurement Sensitivity ◽  
Center Of Mass Energy ◽  
Electron Positron ◽  
Hyperon Decays

Abstract The study of hyperon decays at the Beijing Electron Spectrometer III (BESIII) is proposed to investigate the events of J/ψ decay into hyperon pairs, which provide a pristine experimental environment at the Beijing Electron–Positron Collider II. About 106–108 hyperons, i.e., Λ, Σ, Ξ, and Ω, will be produced in the J/ψ and ψ(2S) decays with the proposed data samples at BESIII. Based on these samples, the measurement sensitivity of the branching fractions of the hyperon decays is in the range of 10−5–10−8. In addition, with the known center-of-mass energy and “tag technique”, rare decays and decays with invisible final states can be probed.

Hadron Production by Electron-Positron Annihilation at 4-GeV Center-of-Mass Energy

1973 ◽  
Vol 30 (23) ◽  
pp. 1189-1192 ◽  
Author(s):  
A. Litke ◽  
G. Hanson ◽  
A. Hofmann ◽  
J. Koch ◽  
L. Law ◽  
...  
Keyword(s):  
Positron Annihilation ◽  
Center Of Mass ◽  
Hadron Production ◽  
Mass Energy ◽  
Center Of Mass Energy ◽  
Electron Positron Annihilation ◽  
Electron Positron

Hadron Production by Electron-Positron Annihilation at 4-GeV Center- of-Mass Energy.

1973 ◽  
Vol 30 (26) ◽  
pp. 1349-1349 ◽  
Author(s):  
A. Litke ◽  
G. Hanson ◽  
A. Hofmann ◽  
J. Koch ◽  
L. Law ◽  
...  
Keyword(s):  
Positron Annihilation ◽  
Center Of Mass ◽  
Hadron Production ◽  
Mass Energy ◽  
Center Of Mass Energy ◽  
Electron Positron Annihilation ◽  
Electron Positron

scholarly journals Search for the process e+e−→D*(2007) with the CMD-3 detector

2019 ◽  
Vol 212 ◽  
pp. 02011
Author(s):  
D. N. Shemyakin ◽  
R. R. Akhmetshin ◽  
A. N. Amirkhanov ◽  
A. V. Anisenkov ◽  
V. M. Aulchenko ◽  
...  
Keyword(s):  
Center Of Mass ◽  
Mass Energy ◽  
Decay Modes ◽  
Center Of Mass Energy ◽  
Upper Limit ◽  
Integrated Luminosity

A search for the process e+e−→ D*0(2007) has been performed with the CMD-3 detector at the VEPP-2000 e+e−-collider. Two main decay modes of the D*0(2007) decay, D0π0 and D0γ, followed by D0 → K+π−π+π−are used in this analysis. With an integrated luminosity of 3.7 pb−1 collected at the center-of-mass energy Ec.m. =2006.62 MeV our preliminary upper limit is BD*0→e+ e− <1.6× 10−6 at 90%C.L.

Total Cross Section for Hadron Production by Electron-Positron Annihilation between 2.4 and 5.0 GeV Center-of-Mass Energy

1975 ◽  
Vol 34 (12) ◽  
pp. 764-767 ◽  
Author(s):  
J. -E. Augustin ◽  
A. M. Boyarski ◽  
M. Breidenbach ◽  
F. Bulos ◽  
J. T. Dakin ◽  
...  
Keyword(s):  
Total Cross Section ◽  
Positron Annihilation ◽  
Cross Section ◽  
Center Of Mass ◽  
Hadron Production ◽  
Mass Energy ◽  
Center Of Mass Energy ◽  
Electron Positron Annihilation ◽  
Electron Positron

Hadron Production by Electron - Positron Annihilation at 5 GeV Center - of Mass Energy

1974 ◽  
Vol 32 (8) ◽  
pp. 432-435 ◽  
Author(s):  
G. Tarnopolsky ◽  
J. Eshelman ◽  
M. E. Law ◽  
J. Leong ◽  
H. Newman ◽  
...  
Keyword(s):  
Positron Annihilation ◽  
Center Of Mass ◽  
Hadron Production ◽  
Mass Energy ◽  
Center Of Mass Energy ◽  
Electron Positron Annihilation ◽  
Electron Positron

Electron-Positron Elastic Scattering at a Center-of-Mass Energy of 4 GeV

1973 ◽  
Vol 30 (11) ◽  
pp. 507-510 ◽  
Author(s):  
R. Madaras ◽  
R. Averill ◽  
G. Hanson ◽  
A. Hofmann ◽  
J. Koch ◽  
...  
Keyword(s):  
Elastic Scattering ◽  
Center Of Mass ◽  
Mass Energy ◽  
Center Of Mass Energy ◽  
Electron Positron

scholarly journals Study of the e+e−→ KS KLπ0 process up to 2 GeV with the CMD-3 detector at the VEPP-2000 collider

2019 ◽  
Vol 212 ◽  
pp. 04008
Author(s):  
A. V. Semenov ◽  
R. R. Akhmetshin ◽  
A. N. Amirkhanov ◽  
A. V. Anisenkov ◽  
V. M. Aulchenko ◽  
...  
Keyword(s):  
Total Cross Section ◽  
Energy Range ◽  
Cross Section ◽  
Center Of Mass ◽  
Mass Energy ◽  
Preliminary Results ◽  
Center Of Mass Energy ◽  
Electron Positron ◽  
The Cross

The cross section of the process e+ e−→ KS KL π0 has been studied with the CMD-3 detector at the VEPP-2000 electron-positron collider in the center-of-mass energy range from 1.1 to 2 GeV. Preliminary results on the total cross section of the process are presented.

RECENT RESULTS FROM THE KLOE EXPERIMENT AT DAΦNE

2005 ◽  
Vol 20 (26) ◽  
pp. 1939-1952
Author(s):  
◽  
MATTEO PALUTAN
Keyword(s):  
Center Of Mass ◽  
Branching Ratio ◽  
Branching Ratios ◽  
Initial State Radiation ◽  
Mass Energy ◽  
Initial State ◽  
Center Of Mass Energy ◽  
Upper Limit ◽  
State Radiation ◽  
Selection Of

The KLOE experiment at DAΦNE has collected data for an integrated luminosity of ~ 1.3 fb-1 from e+e- collisions at center-of-mass energy around the ϕ-meson peak, W ~1.02 GeV . A selection of results obtained from a sample of 450 pb-1 of data acquired during year 2001 and 2002 is presented. Studying tagged KS and KL-mesons produced in the reaction e+e-→ϕ→KS KL we measured the branching ratio of the decay KS→πeν, the upper limit on the decay KS→π0π0π0, and the main KL decay branching ratios. Exploiting the initial state radiation in the reaction e+e-→π+π-γ, we extracted the hadronic cross-section as a function of the squared center-of-mass energy sπ of the π π system, in the range 0.35 < sπ < 0.95 GeV 2.

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