MEASUREMENT OF TAU DECAYS INTO KAONS AT BABAR AND DETERMINATION OF |Vus|

2011 ◽  
Vol 26 (03n04) ◽  
pp. 712-714
Author(s):  
◽  
ALEKSANDRA ADAMETZ
Keyword(s):  
Matrix Element ◽  
Systematic Error ◽  
Positron Annihilation ◽  
Final States ◽  
Tau Decays ◽  
Electron Positron Annihilation ◽  
Electron Positron ◽  
Systematic Effects ◽  
Babar Detector

We present recent measurements of τ decays into final states with kaons, which are based on several hundred million τ+τ- pairs produced in electron-positron annihilation data collected with the BABAR detector. These measurements can be used to determine the Cabibbo-Kobayashi-Maskawa matrix element |Vus| with a tiny systematic error and in two different methods affected by different systematic effects.

Total cross section for electron-positron annihilation into hadron final states in the upsilon energy region

1984 ◽  
Vol 29 (7) ◽  
pp. 1285-1299 ◽  
Author(s):  
R. Giles ◽  
J. Hassard ◽  
M. Hempstead ◽  
K. Kinoshita ◽  
W. W. MacKay ◽  
...  
Keyword(s):  
Total Cross Section ◽  
Positron Annihilation ◽  
Cross Section ◽  
Energy Region ◽  
Final States ◽  
Electron Positron Annihilation ◽  
Electron Positron

Spin-Dependent Structure Function ĝ1+ĝ2 for e++e-→B+X (Revisited)

1997 ◽  
Vol 12 (07) ◽  
pp. 489-491
Author(s):  
Hong Chen
Keyword(s):  
Structure Function ◽  
Positron Annihilation ◽  
Fragmentation Function ◽  
Quark Mass ◽  
Structure Functions ◽  
Transverse Spin ◽  
Qcd Factorization ◽  
Electron Positron Annihilation ◽  
Electron Positron

The QCD factorization expression has been revisited to the sum of two spin-dependent structure functions ĝ1 and ĝ2 for e++e-→B+X. We find that there exist some spurious quark-mass contributions in an expression derived earlier by Lu, Li and Hu. Their removal guarantees that the measurements of ĝ1 and ĝ2 indeed construct a determination of twist-three transverse spin-dependent fragmentation function, ĝT, in the case of inclusive Λ production in electron–positron annihilation.

scholarly journals Double Charmonium Productions in Electron-Positron Annihilation Using Bethe-Salpeter Approach

2019 ◽  
Vol 2019 ◽  
pp. 1-6
Author(s):  
Hluf Negash ◽  
Shashank Bhatnagar
Keyword(s):  
Positron Annihilation ◽  
Cross Sections ◽  
Production Cross ◽  
Center Of Mass ◽  
Theoretical Models ◽  
Final States ◽  
Charmonium Production ◽  
Center Of Mass Energy ◽  
Electron Positron Annihilation ◽  
Electron Positron

We calculate the double charmonium production cross-section within the framework of 4×4 Bethe-Salpeter Equation in the electron-positron annihilation, at center of mass energy s=10.6GeV, that proceeds through the exchange of a single virtual photon. In this calculation, we make use of the full Dirac structure of 4D BS wave functions of these charmonia, with the incorporation of all the Dirac covariants (both leading and subleading). The calculated cross-sections for the double charmonium productions for final states, (J/Ψ,ηc), (Ψ′,ηc), (J/Ψ,ηc′), and (Ψ′,ηc′), are close to experimental data and in broad agreement with results of other theoretical models.

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