scholarly journals Fragmentation functions for baryons in a quark-diquark model

1997 ◽  
Vol 56 (11) ◽  
pp. 7381-7391 ◽  
Author(s):  
Anatoly Adamov ◽  
Gary R. Goldstein
Keyword(s):  
Diquark Model ◽  
Fragmentation Functions

Predictions on the Transverse Single-Spin Asymmetries at Subleading Twist of Pion Production in Semi-Inclusive DIS

2016 ◽  
Vol 40 ◽  
pp. 1660030
Author(s):  
Wenjuan Mao ◽  
Zhun Lu ◽  
Bo-Qiang Ma
Keyword(s):  
Transverse Momentum ◽  
Pion Production ◽  
Diquark Model ◽  
Transverse Momentum Dependent ◽  
Spin Asymmetries ◽  
Single Spin ◽  
Single Spin Asymmetries ◽  
Fragmentation Functions

We estimate the single-spin asymmetries with [Formula: see text] and [Formula: see text] angular dependencies for electroproduction of pions in transversely polarized semi-inclusive DIS process. We consider the effect of the twist-3 transverse momentum dependent distributions which convoluted with twist-2 fragmentation functions. We calculate these distributions in a spectator-diquark model, and predict the corresponding single-spin asymmetries at the kinematics of HERMES, JLab and COMPASS. We find that the numerical estimates show that the asymmetries are sizable, and the T-odd twist-3 TMDs play an important role in these asymmetries.

NLO QCD corrections to heavy baryon fragmentation functions through quark-diquark model

2020 ◽  
Vol 102 (3) ◽  
Author(s):  
S. Mohammad Moosavi Nejad ◽  
Matin Torkian ◽  
Mahdi Delpasand
Keyword(s):  
Heavy Baryon ◽  
Diquark Model ◽  
Fragmentation Functions

scholarly journals The transverse polarization of $$\Lambda $$ hyperons in $$e^+e^-\rightarrow \Lambda ^\uparrow h X$$ processes within TMD factorization

2021 ◽  
Vol 81 (4) ◽  
Author(s):  
Hui Li ◽  
Xiaoyu Wang ◽  
Yongliang Yang ◽  
Zhun Lu
Keyword(s):  
Fragmentation Function ◽  
Belle Collaboration ◽  
Form Factors ◽  
Transverse Polarization ◽  
Kinematical Region ◽  
Diquark Model ◽  
Transverse Momentum Dependent ◽  
Lambda Hyperons ◽  
Fragmentation Functions ◽  
The Spectator

AbstractWe investigate the transverse polarization of the $$\Lambda $$ Λ hyperon in the processes $$e^+e^-\rightarrow \Lambda ^\uparrow \pi ^\pm X$$ e + e - → Λ ↑ π ± X and $$e^+e^-\rightarrow \Lambda ^\uparrow K^\pm X$$ e + e - → Λ ↑ K ± X within the framework of the transverse momentum dependent (TMD) factorization. The transverse polarization is contributed by the convolution of the transversely polarizing fragmentation function (PFF) $$D_{1T}^\perp $$ D 1 T ⊥ of the lambda hyperon and the unpolarized fragmentation function $$D_1$$ D 1 of pion/kaon. We adopt the spectator diquark model result for $$D_{1T}^{\perp }$$ D 1 T ⊥ to numerically estimate the transverse polarization in $$e^+e^-\rightarrow \Lambda ^\uparrow h X$$ e + e - → Λ ↑ h X process at the kinematical region of Belle Collaboration. To implement the TMD evolution formalism of the fragmentation functions, we apply two different parametrizations on the nonperturbative Sudakov form factors associated with the fragmentation functions of the $$\Lambda $$ Λ , pion and kaon. It is found that our prediction on the polarization in the $$\Lambda \pi ^+$$ Λ π + production and $${\bar{\Lambda }} \pi ^-$$ Λ ¯ π - is consistent with the recent Belle measurement in size and sign, while the model predictions on the polarizations in $$\Lambda \pi ^-$$ Λ π - and $$\Lambda K^\pm $$ Λ K ± productions show strong disagreement with the Belle data. The reason for the discrepancies is discussed and possible approaches to improve the calculation in the future are also discussed.

TRANSVERSITY AND AZIMUTHAL SPIN ASYMMETRY OF PION ELECTROPRODUCTION

2003 ◽  
Vol 18 (08) ◽  
pp. 1381-1390
Author(s):  
BO-QIANG MA
Keyword(s):  
Inelastic Scattering ◽  
Light Cone ◽  
Charged Lepton ◽  
Pion Production ◽  
Neutral Pion ◽  
Spin Asymmetry ◽  
Proton Target ◽  
Diquark Model ◽  
Spin Asymmetries ◽  
Fragmentation Functions

The quark transversity distributions are discussed in a light-cone SU(6) quark-diquark model and in a perturbative QCD based analysis. The azimuthal spin asymmetries, both for charged and neutral pion production in semi-inclusive deep inelastic scattering of unpolarized charged lepton beams on longitudinally and transversely polarized nucleon targets, are analyzed. It is found that different approaches to the distribution and fragmentation functions may lead to quite different predictions. It is also found that the unfavored quark to pion fragmentation functions should be taken into account for π- production from a proton target.

scholarly journals Probing quark fragmentation functions for baryon production in unpolarized e+e− annihilation

1995 ◽  
Vol 445 (2-3) ◽  
pp. 380-396 ◽  
Author(s):  
Kun Chen ◽  
Gary R. Goldstein ◽  
R.L. Jaffe ◽  
Xiangdong Ji
Keyword(s):  
Baryon Production ◽  
Quark Fragmentation ◽  
Fragmentation Functions
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