q→Λ fragmentation function and nucleon transversity distribution in a diquark model

The transversity distribution, which describes transversely polarized quarks in a transversely polarized nucleon, is a fundamental component of the current picture of the spin structure of the nucleon, and is only loosely constrained by existing semi-inclusive deep inelastic scattering data. The di-hadron interference fragmentation function (IFF), which describes the fragmentation of transversely polarized quarks, is expected to give rise to spin-dependent di-hadron correlations in p[Formula: see text]+p collisions. Significant di-hadron correlations have recently been measured at RHIC in p[Formula: see text]+p collisions at [Formula: see text] = 200 GeV at mid-rapidity. In 2011, STAR collected p[Formula: see text]+p data at [Formula: see text] = 500 GeV, allowing STAR to extend these di-hadron asymmetries into a previously unexplored kinematic region. The status of the charge-ordered pion pair asymmetry measurement from [Formula: see text] = 500 GeV p[Formula: see text]+p collisions will be presented.

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Transversity distribution and polarized fragmentation function from semi-inclusive pion electroproduction

The European Physical Journal C ◽

10.1007/s100520100564 ◽

2001 ◽

Vol 18 (4) ◽

pp. 639-644 ◽

Cited By ~ 38

Author(s):

V.A. Korotkov ◽

W.-D. Nowak ◽

K.A. Oganessyan

Keyword(s):

Fragmentation Function ◽

Transversity Distribution ◽

Pion Electroproduction

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

The European Physical Journal C ◽

10.1140/epjc/s10052-021-09064-1 ◽

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.

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LO and NLO Fragmentation Function of $$ {\Omega}_{\mathrm{cc}}^{+} $$ and $$ {\Omega}_{cc}^{\ast +} $$Baryons in the Quark-Diquark Model

International Journal of Theoretical Physics ◽

10.1007/s10773-020-04488-z ◽

2020 ◽

Vol 59 (9) ◽

pp. 2694-2711

Author(s):

P. Goushe ◽

R. Sepahvand

Keyword(s):

Fragmentation Function ◽

Diquark Model

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Ωccc PRODUCTION VIA FRAGMENTATION AT LHC

Modern Physics Letters A ◽

10.1142/s0217732399002741 ◽

1999 ◽

Vol 14 (37) ◽

pp. 2615-2619 ◽

Cited By ~ 11

Author(s):

V. A. SALEEV

Keyword(s):

Perturbative Qcd ◽

Fragmentation Function ◽

Leading Order ◽

Diquark Model

In the framework of the leading order of perturbative QCD and the nonrelativistic quark–diquark model of baryons we have obtained fragmentation function for c-quark to split into Ωccc baryon. It is shown that at LHC one can expect 1.8 × 103 events with Ωccc at p⊥>5 GeV/c and |y|<1 per year.

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