scholarly journals Four pion final states with tagged photons at electron positron colliders

2001 ◽  
Vol 18 (3) ◽  
pp. 497-509 ◽  
Author(s):  
H. Czyż ◽  
J.H. Kühn
2014 ◽  
Vol 35 ◽  
pp. 1460440
Author(s):  
ALBERTO LUSIANI

We report recent measurements on τ leptons obtained by the BABAR collaboration using the entire recorded sample of electron-positron collisions at and around the Υ(4S) (about 470fb-1). The events were recorded at the PEP-II asymmetric collider at the SLAC National Accelerator Laboratory. The measurements include high multiplicity τ decay branching fractions with 3 or 5 charged particles in the final state, a search for the second class current the τ decay τ → πη′ν, τ branching fractions into final states containing two KS mesons, [Formula: see text], with h = π, K, and preliminary measurements of hadronic spectra of τ decays with three hadrons (τ- → h-h+h-ντ decays, where h = π, K). The results improve the experimental knowledge of the τ lepton properties and can be used to improve the precision tests of the Standard Model.


2017 ◽  
Vol 95 (7) ◽  
Author(s):  
Qian-Fei Xiang ◽  
Xiao-Jun Bi ◽  
Qi-Shu Yan ◽  
Peng-Fei Yin ◽  
Zhao-Huan Yu

2017 ◽  
Vol 12 (5) ◽  
Author(s):  
Hai-Bo Li

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.


2016 ◽  
Vol 31 (33) ◽  
pp. 1630038
Author(s):  
E. P. Solodov ◽  
A. N. Amirkhanov ◽  
A. V. Anisenkov ◽  
V. M. Aulchenko ◽  
V. S. Banzarov ◽  
...  

The CMD-3 detector has been taking data since December 2010 at the VEPP-2000 electron–positron collider. The collected data sample corresponds to about 60 inverse picobarn of integrated luminosity in the c.m. energy range from 0.32 GeV to 2.0 GeV. Preliminary results of the analysis of various hadronic cross-sections, in particular, [Formula: see text], [Formula: see text], [Formula: see text], [Formula: see text], [Formula: see text], 3[Formula: see text], [Formula: see text], [Formula: see text], [Formula: see text], [Formula: see text], [Formula: see text], [Formula: see text] and [Formula: see text] are presented. The processes with multi-hadron final states have several intermediate states which have to be taken into account to correctly describe the angular and invariant mass distributions, as well as cross-section energy dependence.


1985 ◽  
Vol 34 (4) ◽  
pp. 371-385 ◽  
Author(s):  
L. Angelini ◽  
L. Nitti ◽  
M. Pellicoro ◽  
G. Preparata ◽  
G. Valenti

1984 ◽  
Vol 29 (7) ◽  
pp. 1285-1299 ◽  
Author(s):  
R. Giles ◽  
J. Hassard ◽  
M. Hempstead ◽  
K. Kinoshita ◽  
W. W. MacKay ◽  
...  

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