Two-hadron interference fragmentation functions. I. General framework

Bianconi, A.; Boffi, S.; Jakob, R.; Radici, Marco

doi:10.1103/physrevd.62.034008

Cited by 116 publications

(231 citation statements)

References 25 publications

(43 reference statements)

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“…It was shown in Refs. [4][5][6][7] that this process allows one to directly extract the collinear transversity parton distribution functions (PDF) from a specific azimuthal single spin asymmetry (SSA), where it is multiplied by the socalled interference DiFF (IFF) H 1 . At the same time, the two-hadron SIDIS cross section on a longitudinally polarized nucleon also gives access to the helicity PDF, which in this case is convoluted with the helicity dependent DiFF G ⊥ 1 .…”

Section: Introductionmentioning

confidence: 99%

Dihadron fragmentation functions in the quark-jet model: Longitudinally polarized quarks

2017

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We study the dihadron fragmentation functions (DiFF) of longitudinally polarized quarks into pion pairs. The quark-jet framework is used to model the sequential hadronization of a polarized quark into hadrons, where the polarization transfer to the remnant quark in each hadron emission step is calculated using the spin density matrix formalism. Using Monte Carlo (MC) simulations of the hadronization process, we find a nonvanishing helicity dependent DiFF, G ⊥ 1 , which is also related to the longitudinal jet handedness. A method is developed for extracting the angular moments of this DiFF, which enter the expressions for the azimuthal asymmetries for an electron-positron annihilation process into two pairs of hadrons from back-to-back jets and the dihadron production in semi-inclusive deep inelastic scattering. Finally, we derive explicit integral expressions for DiFFs where only two hadrons are emitted by a quark and use them to validate our MC results for both unpolarized and helicity dependent DiFFs.

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Section: Introductionmentioning

confidence: 99%

Dihadron fragmentation functions in the quark-jet model: Longitudinally polarized quarks

2017

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“…The components of 3-vectors perpendicular to theẑ directions in the two systems are denoted with subscripts ⊥ and T. The total and the relative light-cone momentum 1 fractions are expressed in terms of those for individual hadrons z i ¼ P where D 1 is the unpolarized, G ⊥ 1 is the helicity-dependent, H …”

Section: Formalism a Kinematics And Definitionsmentioning

confidence: 99%

“…The study of the transverse-polarization-dependent dihadron fragmentation functions (DiFFs) [1,2], and of the interference DiFF (IFF) in particular, has gained a lot of attention in recent years, both in theory and in experiment. The chief reason is that the IFF is a crucial ingredient in accessing the so-called transversity parton distribution function (PDF) in dihadron production in semi-inclusive deep inelastic scattering (SIDIS) [3][4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Dihadron fragmentation functions in the quark-jet model: Transversely polarized quarks

2018

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Within the most recent extension of the quark-jet hadronization framework, we explore the transversepolarization-dependent dihadron fragmentation functions (DiFFs) H . A notable finding is that there are previously unnoticed apparent discrepancies between the definitions of the so-called interference DiFF (IFF) H ∢ 1 , entering the cross sections for two-hadron semi-inclusive electroproduction, and those involved in the production of two pairs of hadrons from backto-back jets in electron-positron annihilation. This manuscript completes the studies of all four leadingtwist DiFFs for unpolarized hadron pairs within the quark-jet framework, following our previous work on the helicity-dependent DiFF G ⊥ 1 .

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“…In this case, the di-hadron SIDIS cross section (once integrated over partonic transverse momenta) contains a specific modulation in the azimuthal orientation of the plane containing the momenta of the two hadrons. The coefficient of this modulation is the simple product h 1 H 1 where H 1 is a chiral-odd di-hadron fragmentation function (DiFF) quantifying the above correlation [3,4,5]. The function H 1 can be independently determined by looking at correlations between the azimuthal orientations of two hadron pairs in back-to-back jets in e + e − annihilation [6,7,8].…”

Section: Introductionmentioning

confidence: 99%

First extraction of transversity from data on lepton-hadron scattering and hadronic collisions

Radici¹

2019

Proceedings of 23rd International Spin Physics Symposium — PoS(SPIN2018)

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We present the first extraction of the transversity distribution based on the global analysis of pion-pair production in deep-inelastic scattering and in proton-proton collisions with one transversely polarized proton. The extraction relies on the knowledge of di-hadron fragmentation functions, which are taken from the analysis of electron-positron annihilation data. For the first time, the chiral-odd transversity is extracted from a global analysis similar to what is usually done for the chiral-even spin-averaged and helicity distributions. The knowledge of transversity is important among other things for detecting possible signals of new physics in high-precision low-energy experiments.

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Two-hadron interference fragmentation functions. I. General framework

Cited by 116 publications

References 25 publications

Dihadron fragmentation functions in the quark-jet model: Longitudinally polarized quarks

Dihadron fragmentation functions in the quark-jet model: Longitudinally polarized quarks

Dihadron fragmentation functions in the quark-jet model: Transversely polarized quarks

First extraction of transversity from data on lepton-hadron scattering and hadronic collisions

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