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 IMPLICATIONS OF AN R-SCAN FOR CHARM PHYSICS

2014 ◽  
Vol 35 ◽  
pp. 1460386
Author(s):  
JOHANN H. KÜHN
Keyword(s):  
Cross Section ◽  
Quark Mass ◽  
Charm Physics ◽  
Threshold Region ◽  
High Luminosity ◽  
Electron Positron Annihilation ◽  
Electron Positron ◽  
The Impact ◽  
The Continuum

The impact of improved measurements of the cross section for electron-positron annihilation into hadrons in the charm threshold region is discussed. Two aspects are studied in detail: i.) A significant reduction of the experimental error of the electronic width of the narrow resonances J/ψ and ψ′ and of the continuum cross section from the open charm threshold up to 4.6 GeV will lead to a correspondingly improved determination of the charmed quark mass; ii) A high luminosity measurement with 24 pb-1 at three points and with a spacing of 2 MeV around [Formula: see text] may allow to observe the direct, resonant production of χc1.

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.

scholarly journals Power corrections to event shapes using Eikonal dressed gluon exponentiation

2021 ◽  
Vol 2021 (3) ◽  
Author(s):  
Neelima Agarwal ◽  
Ayan Mukhopadhyay ◽  
Sourav Pal ◽  
Anurag Tripathi
Keyword(s):  
Cross Section ◽  
Established Method ◽  
Hadronic Event ◽  
Power Corrections ◽  
Electron Positron Annihilation ◽  
Electron Positron ◽  
Lhc Physics ◽  
Event Shapes ◽  
Jet Shapes

AbstractEvent shapes are classical tools for the determination of the strong coupling and for the study of hadronization effects in electron-positron annihilation. In the context of analytical studies, hadronization corrections take the form of power-suppressed contributions to the cross section, which can be extracted from the perturbative ambiguity of Borel-resummed distributions. We propose a simplified version of the well-established method of Dressed Gluon Exponentiation (DGE), which we call Eikonal DGE (EDGE), which determines all dominant power corrections to event shapes by means of strikingly elementary calculations. We believe our method can be generalized to hadronic event shapes and jet shapes of relevance for LHC physics.

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