scholarly journals Impacts of B-factory measurements on determination of fragmentation functions from electron–positron annihilation data

2016 ◽  
Vol 2016 (11) ◽  
pp. 113B04 ◽  
Author(s):  
M. Hirai ◽  
H. Kawamura ◽  
S. Kumano ◽  
K. Saito
Keyword(s):  
Positron Annihilation ◽  
Electron Positron Annihilation ◽  
Electron Positron ◽  
Fragmentation Functions ◽  
B Factory

Vector meson production in electron positron annihilation process

2021 ◽  
pp. 2150120
Author(s):  
Weihua Yang ◽  
Fei Huang
Keyword(s):  
Differential Cross Section ◽  
Vector Meson ◽  
Positron Annihilation ◽  
Cross Section ◽  
Differential Cross ◽  
High Energy ◽  
Annihilation Process ◽  
Electron Positron Annihilation ◽  
Electron Positron ◽  
Fragmentation Functions

When tunneling events induced by nontrivial configurations of the quantum chromodynamics gauge fields are taken into consideration, parity violating quantities emerge. Based on this consideration, parity-odd fragmentation functions can be introduced in the high energy reactions. In this paper, we calculate the differential cross-section in terms of both the parity-even and parity-odd fragmentation functions in semi-inclusive electron positron annihilation process. Semi-inclusive implies that not only a vector meson in one jet but also the back-to-back jet is measured in this reaction. According to the differential cross-section, we further calculate the azimuthal asymmetries and hadron polarizations in terms of fragmentation functions. A method of measuring the parity violating effects in the semi-inclusive annihilation process is suggested.

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.

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.

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