First extraction of the 
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 polarizing fragmentation function from Belle 
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 data

D’Alesio, U.; Murgia, F.; Marco, Zaccheddu,

doi:10.1103/physrevd.102.054001

Cited by 40 publications

(37 citation statements)

References 30 publications

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“…Moreover, by employing a Gaussian ansatz for the transverse momentum dependence of the TMD-FFs, we have obtained simple expressions for the structure functions, useful in phenomenological analyses. In particular, we have re-derived the explicit formula for the single transverse polarization of spin-1/2 hadron production in e + e − → h ↑ 1 h 2 +X processes, which has allowed for the first ever extraction of the polarizing FF for Λ hyperons from Belle data [28].…”

Section: Discussionmentioning

confidence: 99%

“…The motivations behind this study are several: from the theory point of view, it represents the extension to spin-1/2 hadrons of the helicity formalism and the classification of all leading-twist quark and gluon TMD-FFs, focusing, for quarks, on their role in polarized hadron production in e + e − collisions; on the phenomenology side, it timely matches the renewed interest, triggered by recent data from the Belle Collaboration on the transverse Λ polarization [27], in the associate hadron production in e + e − annihilation processes. In this context, indeed, the first phenomenological analysis within a TMD framework has been carried out [28] (see also ref. [29] for a similar study).…”

Section: Introductionmentioning

confidence: 99%

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General helicity formalism for two-hadron production in e+e− annihilation within a TMD approach

D’Alesio

Murgia

Marco

2021

J. High Energ. Phys.

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We present the complete leading-order results for the azimuthal dependences and polarization observables in e+e−→ h1h2 + X processes, where the two hadrons are produced almost back-to-back, within a transverse momentum dependent (TMD) factorization scheme. We consider spinless (or unpolarized) and spin-1/2 hadron production and give the full set of the corresponding quark and gluon TMD fragmentation functions (TMD-FFs). By adopting the helicity formalism, which allows for a more direct probabilistic interpretation, single- and double-polarization cases are discussed in detail. Simplified expressions, useful for phenomenological analyses, are obtained by assuming a factorized Gaussian-like dependence on intrinsic transverse momenta for the TMD-FFs.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

General helicity formalism for two-hadron production in e+e− annihilation within a TMD approach

D’Alesio

Murgia

Marco

2021

J. High Energ. Phys.

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“…A rather straightforward example of this strategy will be the combined analysis of the BELLE measurements of the polarization of Λ hyperons [17] in e + e − → Λπ(K )X processes (2-h class), already studied in Ref. [21] within a generalized-parton model approach, and in e + e − → ΛX , i.e. in a 1h-class process.…”

Section: Factorization Definition Vs Square Root Definitionmentioning

confidence: 99%

Universality-breaking effects in $$e^+e^-$$ hadronic production processes

Boglione

Simonelli

2021

Eur. Phys. J. C

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Recent BELLE measurements provide the cross section for single hadron production in $$e^+e^-$$ e + e - annihilations, differential in thrust and in the hadron transverse momentum with respect to the thrust axis. Universality breaking effects due to process-dependent soft factors make it very difficult to relate this cross sections to those corresponding to hadron-pair production in $$e^+e^-$$ e + e - annihilations, where transverse momentum dependent (TMD) factorization can be applied. The correspondence between these two cross sections is examined in the framework of the Collins-Soper-Sterman factorization, in the collinear as well as in the TMD approach. We propose a scheme that allows to relate the TMD parton densities defined in 1-hadron and in 2-hadron processes, neatly separating, within the soft and collinear parts, the non-perturbative terms from the contributions that can be calculated perturbatively. The regularization of rapidity divergences introduces cut-offs, the arbitrariness of which will be properly reabsorbed by means of a mechanism closely reminiscent of a gauge transformation. In this way, we restore the possibility to perform global phenomenological studies of TMD physics, simultaneously analyzing data belonging to different hadron classes.

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“…This function can be responsible, in a TMD approach, for the large transverse polarization of Λ hyperons inclusively produced in unpolarized proton-proton and proton-nucleus collisions [15], measured since the late 70s and still waiting a clear explanation in perturbative QCD and, more recently, in e + e − annihilations (see, e.g., Ref. [16]).…”

Section: The Transverse Momentum Dependent Approachmentioning

confidence: 99%

Investigating the Transverse Momentum Dependent Gluon Sivers Function in Quarkonium Production at pp Colliders

2021

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In this contribution, we will present a short overview of the transverse momentum dependent (TMD) approach as a tool for studying the 3-dimensional structure of hadrons in high-energy (un)polarized hadron collisions. We will then summarize the present status of a running research programme that aims at constraining the poorly known transverse momentum dependent gluon Sivers function, through the study of single spin asymmetries in quarkonium (mainly J/ψ), pion, and D-meson production in polarized proton-proton collisions at RHIC. Finally, we will shortly discuss perspectives for this field of research, emphasizing in particular its role in the physics programme of LHC in the fixed-target setup and NICA-SPD at JINR.

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First extraction of the Λ polarizing fragmentation function from Belle e+e− data

Cited by 40 publications

References 30 publications

General helicity formalism for two-hadron production in e+e− annihilation within a TMD approach

General helicity formalism for two-hadron production in e+e− annihilation within a TMD approach

Universality-breaking effects in $$e^+e^-$$ hadronic production processes

Investigating the Transverse Momentum Dependent Gluon Sivers Function in Quarkonium Production at pp Colliders

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